Home

TAC Library

Subscribe to TAC Library feed
New TAC Library Materials.
Updated: 4 min 9 sec ago

Guide canadien de conception géométrique des routes : Chapitre 7 – Aménagement des abords de route

Tue, 03/26/2019 - 20:33
Guide canadien de conception géométrique des routes : Chapitre 7 – Aménagement des abords de route
by Chiu,M; Clayton,C; Millen,G; et al.
2017.
CA6 ARH_85 2017G22 Ch.07Z - REF


Le Guide canadien de conception géométrique des routes fait état de la recherche et des pratiques actuelles en matière de conception et de facteurs humains aux fins de la conception géométrique des routes. Il remplace l’édition de 1999 et les mises à jour subséquentes. Le Guide offre une orientation aux planificateurs et aux concepteurs pour le développement de solutions de conception qui répondent aux besoins d’une variété d’usagers tout en abordant la question des conditions et des environnements locaux. Des lignes directrices pour la conception d’autoroutes, d’artères, de routes collectrices et de routes locales, tant en milieu urbain qu’en milieu rural, sont incluses de même que pour des aménagements intégrés pour les cyclistes et les piétons. Le Guide est réparti en dix chapitres afin de couvrir le processus complet de conception depuis la philosophie de conception à la classification des routes, les paramètres de conception, et les lignes directrices spécifiques pour l’aménagement sécuritaire des véhicules, des cyclistes et des piétons sur les éléments linéaires de la route et aux carrefours. Les chapitres sont : philosophie de la conception; contraintes, classification et uniformité de la conception; configuration des tracés et des voies; éléments des profils en travers; conception intégrée pour cyclistes; conception intégrée pour piétons; conception des abords de route; accès; carrefours; et échangeurs. Chapitre 7 – Aménagement des abords de route présente des concepts de sécurité routière et l’utilisation d’une analyse quantitative pour évaluer les options de conception sécuritaire des abords de route. Le concept fondamental de dégagement latéral y est décrit de même que la façon dont il peut être appliqué en prévoyant un profil en travers approprié et des éléments de drainage qui permettent aux conducteurs de recouvrer la maîtrise de leur véhicule. Des techniques d’atténuation et de protection destinées à réduire la gravité des collisions avec les objets fixes du mobilier urbain situé en bordure de route, tels que les panneaux, les lampadaires et les glissières de sécurité y sont décrites. Le chapitre comporte également un exposé sur l’aménagement des abords de route en milieu urbain et des abords de routes à faible débit de circulation.

Guide canadien de conception géométrique des routes : Chapitre 6 – Conception intégrée pour piétons

Tue, 03/26/2019 - 20:33
Guide canadien de conception géométrique des routes : Chapitre 6 – Conception intégrée pour piétons
by Chiu,M; Clayton,C; Millen,G; et al.
2017.
CA6 ARH_85 2017G22 Ch.06Z - REF


Le Guide canadien de conception géométrique des routes fait état de la recherche et des pratiques actuelles en matière de conception et de facteurs humains aux fins de la conception géométrique des routes. Il remplace l’édition de 1999 et les mises à jour subséquentes. Le Guide offre une orientation aux planificateurs et aux concepteurs pour le développement de solutions de conception qui répondent aux besoins d’une variété d’usagers tout en abordant la question des conditions et des environnements locaux. Des lignes directrices pour la conception d’autoroutes, d’artères, de routes collectrices et de routes locales, tant en milieu urbain qu’en milieu rural, sont incluses de même que pour des aménagements intégrés pour les cyclistes et les piétons. Le Guide est réparti en dix chapitres afin de couvrir le processus complet de conception depuis la philosophie de conception à la classification des routes, les paramètres de conception, et les lignes directrices spécifiques pour l’aménagement sécuritaire des véhicules, des cyclistes et des piétons sur les éléments linéaires de la route et aux carrefours. Les chapitres sont : philosophie de la conception; contraintes, classification et uniformité de la conception; configuration des tracés et des voies; éléments des profils en travers; conception intégrée pour cyclistes; conception intégrée pour piétons; conception des abords de route; accès; carrefours; et échangeurs. Le Chapitre 6 – Conception intégrée pour piétons offre des conseils et des exemples sur la façon d’intégrer de manière globale la conception d’installations piétonnières à la conception routière afin d’obtenir une solution équilibrée pour tous les modes de transport et pour tous les usagers de la route. Y figurent des lignes directrices sur les besoins en matière de conception pour les piétons et pour les utilisateurs de fauteuils roulants, sur l’utilisation d’une approche cadre à la conception qui subdivise les abords de route en zones de façade, de circulation des piétons et d’aménagement, et sur des éléments de conception spécifiques. On y traite de l’intégration à d’autres éléments de conception, tels que la largeur des voies de circulation adjacentes, les carrefours giratoires et les ponts, et à d’autres modes de transport.

Guide canadien de conception géométrique des routes : Chapitre 5 – Conception intégrée pour cyclistes

Tue, 03/26/2019 - 20:33
Guide canadien de conception géométrique des routes : Chapitre 5 – Conception intégrée pour cyclistes
by Chiu,M; Clayton,C; Millen,G; et al.
2017.
CA6 ARH_85 2017G22 Ch.05Z - REF


Le Guide canadien de conception géométrique des routes fait état de la recherche et des pratiques actuelles en matière de conception et de facteurs humains aux fins de la conception géométrique des routes. Il remplace l’édition de 1999 et les mises à jour subséquentes. Le Guide offre une orientation aux planificateurs et aux concepteurs pour le développement de solutions de conception qui répondent aux besoins d’une variété d’usagers tout en abordant la question des conditions et des environnements locaux. Des lignes directrices pour la conception d’autoroutes, d’artères, de routes collectrices et de routes locales, tant en milieu urbain qu’en milieu rural, sont incluses de même que pour des aménagements intégrés pour les cyclistes et les piétons. Le Guide est réparti en dix chapitres afin de couvrir le processus complet de conception depuis la philosophie de conception à la classification des routes, les paramètres de conception, et les lignes directrices spécifiques pour l’aménagement sécuritaire des véhicules, des cyclistes et des piétons sur les éléments linéaires de la route et aux carrefours. Les chapitres sont : philosophie de la conception; contrôle, classification et uniformité de la conception; configuration des tracés et des voies; éléments des profils en travers; conception intégré pour les cyclistes; conception intégré pour les piétons; conception des abords de route; accès; carrefours; et échangeurs. Le Chapitre 5 – Conception intégrée pour cyclistes offre des conseils et des exemples sur la façon d’intégrer de manière globale la conception d’installations cyclables à la conception routière afin d’obtenir une solution équilibrée pour tous les modes de transport et pour tous les usagers de la route. Y figurent des lignes directrices sur les besoins en matière de conception pour les cyclistes et pour les patineurs à roues alignées, sur un cadre de sélection des installations pour trouver l’installation cyclable appropriée et sur des éléments de conception spécifiques.

Guide canadien de conception géométrique des routes : Chapitre 4 – Éléments du profil en travers

Tue, 03/26/2019 - 20:33
Guide canadien de conception géométrique des routes : Chapitre 4 – Éléments du profil en travers
by Chiu,M; Clayton,C; Millen,G; et al.
2017.
CA6 ARH_85 2017G22 Ch.04Z - REF


Le Guide canadien de conception géométrique des routes fait état de la recherche et des pratiques actuelles en matière de conception et de facteurs humains aux fins de la conception géométrique des routes. Il remplace l’édition de 1999 et les mises à jour subséquentes. Le Guide offre une orientation aux planificateurs et aux concepteurs pour le développement de solutions de conception qui répondent aux besoins d’une variété d’usagers tout en abordant la question des conditions et des environnements locaux. Des lignes directrices pour la conception d’autoroutes, d’artères, de routes collectrices et de routes locales, tant en milieu urbain qu’en milieu rural, sont incluses de même que pour des aménagements intégrés pour les cyclistes et les piétons. Le Guide est réparti en dix chapitres afin de couvrir le processus complet de conception depuis la philosophie de conception à la classification des routes, les paramètres de conception, et les lignes directrices spécifiques pour l’aménagement sécuritaire des véhicules, des cyclistes et des piétons sur les éléments linéaires de la route et aux carrefours. Les chapitres sont : philosophie de la conception; contraintes, classification et uniformité de la conception; configuration des tracés et des voies; éléments des profils en travers; conception intégrée pour cyclistes; conception intégrée pour piétons; conception des abords de route; accès; carrefours; et échangeurs. Chapitre 4 – Éléments du profil en travers fournit des indications sur les procédures de conception et sur les domaines de définition des profils en travers et de leurs éléments connexes, y compris l’utilisation de voies spéciales, d’accotements, de terre-pleins centraux et latéraux, de banquettes, de bordures, de caniveaux et de drainage. On y traite également des ponts et de l’utilisation partagée de l’emprise par les services publics, du stockage de la neige et de l’élargissement futur des routes; une série de profils en travers types y sont également présentés.

Guide canadien de conception géométrique des routes : Chapitre 3 – Tracé et configuration des voies

Tue, 03/26/2019 - 20:33
Guide canadien de conception géométrique des routes : Chapitre 3 – Tracé et configuration des voies
by Chiu,M; Clayton,C; Millen,G; et al.
2017.
CA6 ARH_85 2017G22 Ch.03Z - REF


Le Guide canadien de conception géométrique des routes fait état de la recherche et des pratiques actuelles en matière de conception et de facteurs humains aux fins de la conception géométrique des routes. Il remplace l’édition de 1999 et les mises à jour subséquentes. Le Guide offre une orientation aux planificateurs et aux concepteurs pour le développement de solutions de conception qui répondent aux besoins d’une variété d’usagers tout en abordant la question des conditions et des environnements locaux. Des lignes directrices pour la conception d’autoroutes, d’artères, de routes collectrices et de routes locales, tant en milieu urbain qu’en milieu rural, sont incluses de même que pour des aménagements intégrés pour les cyclistes et les piétons. Le Guide est réparti en dix chapitres afin de couvrir le processus complet de conception depuis la philosophie de conception à la classification des routes, les paramètres de conception, et les lignes directrices spécifiques pour l’aménagement sécuritaire des véhicules, des cyclistes et des piétons sur les éléments linéaires de la route et aux carrefours. Les chapitres sont : philosophie de la conception; contrôle, classification et uniformité de la conception; configuration des tracés et des voies; éléments des profils en travers; conception intégré pour les cyclistes; conception intégré pour les piétons; conception des abords de route; accès; carrefours; et échangeurs. Chapitre 3 – Tracé et configurations des voies traite essentiellement des procédures de conception et des domaines de définition propres au tracé en plan et au profil en long, de la coordination de ces deux éléments de conception et des aspects qui leur sont directement reliés, dont notamment les pentes transversales, l’élargissement des voies, l’équilibre et la continuité des voies ainsi que les voies de circulation spécialisées comme les voies pour véhicules lents, les voies de dépassement et les voies de secours pour camions.

Guide canadien de conception géométrique des routes : Chapitre 2 – Contraintes, classification et uniformité de la conception

Tue, 03/26/2019 - 20:33
Guide canadien de conception géométrique des routes : Chapitre 2 – Contraintes, classification et uniformité de la conception
by Chiu,M; Clayton,C; Millen,G; et al.
2017.
CA6 ARH_85 2017G22 Ch.02Z - REF


Le Guide canadien de conception géométrique des routes fait état de la recherche et des pratiques actuelles en matière de conception et de facteurs humains aux fins de la conception géométrique des routes. Il remplace l’édition de 1999 et les mises à jour subséquentes. Le Guide offre une orientation aux planificateurs et aux concepteurs pour le développement de solutions de conception qui répondent aux besoins d’une variété d’usagers tout en abordant la question des conditions et des environnements locaux. Des lignes directrices pour la conception d’autoroutes, d’artères, de routes collectrices et de routes locales, tant en milieu urbain qu’en milieu rural, sont incluses de même que pour des aménagements intégrés pour les cyclistes et les piétons. Le Guide est réparti en dix chapitres afin de couvrir le processus complet de conception depuis la philosophie de conception à la classification des routes, les paramètres de conception, et les lignes directrices spécifiques pour l’aménagement sécuritaire des véhicules, des cyclistes et des piétons sur les éléments linéaires de la route et aux carrefours. Les chapitres sont : philosophie de la conception; contraintes, classification et uniformité de la conception; configuration des tracés et des voies; éléments des profils en travers; conception intégrée pour cyclistes; conception intégrée pour piétons; conception des abords de route; accès; carrefours; et échangeurs. Le Chapitre 2 – Contraintes, classification et uniformité de la conception traite de la façon dont les contraintes de conception, telles que les facteurs humains, la vitesse, les véhicules types et les distances de visibilité, influent sur la conception géométrique. Ce chapitre contient également une orientation concernant la classification des raccordements par classe de route afin d’assurer un réseau routier hiérarchisé et facile à comprendre qui sert efficacement différents objectifs. Figurent dans ce chapitre les principes visant à assurer l’uniformité du profil en travers, de la vitesse maximale réalisable et de la charge de travail du conducteur.

Guide canadien de conception géométrique des routes : Chapitre 1 – Philosophie de la conception

Tue, 03/26/2019 - 20:33
Guide canadien de conception géométrique des routes : Chapitre 1 – Philosophie de la conception
by Chiu,M; Clayton,C; Millen,G; et al.
2017.
CA6 ARH_85 2017G22 Ch.01Z - REF


Le Guide canadien de conception géométrique des routes fait état de la recherche et des pratiques actuelles en matière de conception et de facteurs humains aux fins de la conception géométrique des routes. Il remplace l’édition de 1999 et les mises à jour subséquentes. Le Guide offre une orientation aux planificateurs et aux concepteurs pour le développement de solutions de conception qui répondent aux besoins d’une variété d’usagers tout en abordant la question des conditions et des environnements locaux. Des lignes directrices pour la conception d’autoroutes, d’artères, de routes collectrices et de routes locales, tant en milieu urbain qu’en milieu rural, sont incluses de même que pour des aménagements intégrés pour les cyclistes et les piétons. Le Guide est réparti en dix chapitres afin de couvrir le processus complet de conception depuis la philosophie de conception à la classification des routes, les paramètres de conception, et les lignes directrices spécifiques pour l’aménagement sécuritaire des véhicules, des cyclistes et des piétons sur les éléments linéaires de la route et aux carrefours. Les chapitres sont : philosophie de la conception; contraintes, classification et uniformité de la conception; configuration des tracés et des voies; éléments des profils en travers; conception intégrée pour cyclistes; conception intégrée pour piétons; conception des abords de route; accès; carrefours; et échangeurs. Le chapitre 1, Philosophie de la conception, offre une introduction aux objectifs de la conception, à son approche évolutive et au domaine de définition utilisé tout au long du Guide. Des orientations quant aux analyses avantages-coûts, à l’ingénierie de la valeur et aux exceptions de conception sont également fournies.

Laboratory Evaluation of Performance Properties of Asphalt Binders and Mixes Containing a New Rejuvenator

Wed, 02/27/2019 - 20:34
Laboratory Evaluation of Performance Properties of Asphalt Binders and Mixes Containing a New Rejuvenator
by Xie,Z; Turner,P; Taylor,A; Tran,N; McCurdy,A.
2018.
Asphalt Paving Technology 2018: Journal of the Association of Asphalt Paving Technologists - Jacksonville, Florida, March 18-21, 2018.
US6 AFN___ 2018P20 - MAIN


As higher recycled asphalt pavement (RAP) contents are utilized in asphalt mixtures, the mixes will be stiffer and more brittle, thereby losing resistance to various types of cracking. To offset these changes in stiffness and ductility, rejuvenators have been used in asphalt mixes containing high recycled contents to improve their performance properties. The objective of this project was to evaluate the effect of a new rejuvenator, a corn oil-based co-product, on the performance of high RAP mixes. Three mixes were evaluated in this study: two 50% RAP mixes with and without the rejuvenator and a control virgin mix. Performance grade and frequency sweep tests were conducted to explore the effect of rejuvenator on the performance of the asphalt binder. Moisture damage, dynamic modulus, rutting, and cracking tests were performed to evaluate the effect of rejuvenator on the mix performance. Results of this study indicated that the new rejuvenator was effective in lowering the stiffness of RAP asphalt binder and improving the resistance to cracking and moisture damage of 50% RAP mix without imposing negative rutting effects.

Low Temperature Behavior of Asphalt Binders, Mortars, and Mixtures with High Recycled Materials Content

Wed, 02/27/2019 - 20:34
Low Temperature Behavior of Asphalt Binders, Mortars, and Mixtures with High Recycled Materials Content
by Morian,N; Hajj,EY; Pournoman,S; Habbouche,J; Batioja-Alvarez,DD.
2018.
Asphalt Paving Technology 2018: Journal of the Association of Asphalt Paving Technologists - Jacksonville, Florida, March 18-21, 2018.
US6 AFN___ 2018P19 - MAIN


With the increased usage of recycled materials and various evaluation techniques being utilized to evaluate them, it is becoming increasingly important to be able to obtain consistency between the various techniques. Given the wide range recycled materials as well as treatments or additive materials being used and the complex interactions resulting between them, it is becoming increasingly important to continually verify the field performance related to the findings of the various evaluation techniques. Therefore, this effort utilized binder blending, mortar procedure, and the uniaxial thermal stress and strain test (UTSST) to examine several mixtures containing recycled asphalt pavement (RAP) and recycled asphalt shingles (RAS) along with example recycling agents. The methodologies were compared to each other to seek similarity in findings as well as preliminary comparisons to relevant field performance. The results indicated general agreement between certain parameters of each methodology, while the UTSST showed promising relationships to measured longitudinal and transverse cracking in the observed field test sections.

Modern, Recycled SMA Mixtures on the Illinois Tollway and Preliminary Performance-Based Mix Design Approach

Tue, 02/26/2019 - 21:31
Modern, Recycled SMA Mixtures on the Illinois Tollway and Preliminary Performance-Based Mix Design Approach
by Wang,H; Buttlar,WG.
2018.
Asphalt Paving Technology 2018: Journal of the Association of Asphalt Paving Technologists - Jacksonville, Florida, March 18-21, 2018.
US6 AFN___ 2018P18 - MAIN


As more recycled materials are utilized in modern asphalt mixtures, the overall phenomenological behavior of this important infrastructure material becomes more complex than ever, accelerating the need to supplement volumetric-based mix testing procedures with mixture mechanical tests. This paper introduces a mixture performance test based design approach, as a supplement to the current Superpave volumetric mix design approach, which is being implemented by several agencies near Chicago, Illinois, USA. For research purposes, the practical design suite, which considers the high and low-temperature performance of asphalt mixtures through Hamburg wheel tracking and disk-shaped compact tension fracture testing, has been supplemented by additional testing and analysis including creep compliance, performance-space diagram construction, and thermal cracking modeling using the software program ILLI-TC. Field cores from seven Illinois Tollway sites in Chicagoland with well-tracked pavement performance were tested and analyzed using the aforementioned methods. These modern, high-performance stone matrix asphalt (SMA) recycled mixtures contained recycled asphalt pavement (RAP), reclaimed asphalt shingles (RAS), and ground tire rubber (GTR), and used a 3.5% design void target to promote mix durability. Rutting and cracking test results, and thermal cracking modeling predictions, were found to be consistent with field observations indicating near-zero rutting and cracking levels after up to eight years of heavy tollway traffic and severe mid-continental environmental conditions. In addition, the Hamburg-DC(T) performance space diagram was used to further analyze the results, demonstrating how this plotting tool can be used to adjust future mix designs to yield even longer life on the Tollway system at little to no extra cost.

Practical Tools for Optimizing Recycled Materials Content and Recycling Agent Dosage for Improved Short- and Long-Term Performance of Rejuvenated Binder Blends and Mixtures

Tue, 02/26/2019 - 21:31
Practical Tools for Optimizing Recycled Materials Content and Recycling Agent Dosage for Improved Short- and Long-Term Performance of Rejuvenated Binder Blends and Mixtures
by Kaseer,F; Cucalon,LG; Arambula-Mercado,E; Martin,AE; Epps,J.
2018.
Asphalt Paving Technology 2018: Journal of the Association of Asphalt Paving Technologists - Jacksonville, Florida, March 18-21, 2018.
US6 AFN___ 2018P17 - MAIN


The use of large quantities of reclaimed asphalt pavement (RAP) and recycled asphalt shingles (RAS) in asphalt mixtures is desirable due to environmental and economic benefits. However, recycled asphalt mixtures with high recycled materials contents are usually less workable; difficult to compact in the field; and more prone to cracking, raveling, and other durability-related pavement distresses. Recycling agents can rejuvenate the aged binders in the recycled materials to different degrees depending on type and dosage, facilitating the inclusion of increased amounts of recycled materials. Recycling agents modify the ultimate performance of the corresponding rejuvenated asphalt mixtures, thus estimating an optimum recycling agent dosage is critical to maximize its benefit without compromising the short- and long-term performance of the rejuvenated asphalt mixture. This study provides tools for estimating recycling agent dosage based on a target climate with minimum laboratory efforts by considering the type, source, and amount of recycled materials, and the source and grade of the base (virgin) binder. A total of 15 different recycled binder blends (base and recycled binders) and 32 different rejuvenated binder blends (recycled binder blends with recycling agent) were considered, including materials from eight states across the United States. Blending charts for recycled binder blends were established and verified, and later used to develop relationships to estimate the optimum dosage of recycling agent. The recycling agent optimum dosages were determined to match the continuous high-temperature performance grade (PGH) of the recycled binder blend to that required by the target climate, as this dosage yielded the best performance for rejuvenated binders and mixtures. Long-term rejuvenating effectiveness of recycling agents was verified by extensive evaluation of rejuvenated binder blends and mixtures. Discussion on optimizing RAP/RAS and base binder proportions and controlling the maximum dosage of recycling agent for economic and pavement performance considerations was also provided. Finally, practice-ready guidelines for evaluation, materials selection/optimization, and design of rejuvenated asphalt mixtures with high recycled materials contents were prepared.

Climate-, Depth-, and Time-Based Laboratory Aging Procedure for Asphalt Mixtures

Tue, 02/26/2019 - 21:31
Climate-, Depth-, and Time-Based Laboratory Aging Procedure for Asphalt Mixtures
by Elwardany,MD; Rad,FY; Castorena,C; Kim,YR.
2018.
Asphalt Paving Technology 2018: Journal of the Association of Asphalt Paving Technologists - Jacksonville, Florida, March 18-21, 2018.
US6 AFN___ 2018P16 - MAIN


Aging causes asphalt pavement materials to stiffen and embrittle, which leads to a high cracking potential. A practical and accurate laboratory conditioning procedure that can simulate long-term aging of asphalt concrete for performance testing and prediction is required in order to integrate the effects of aging in pavement performance prediction models and other mechanistic design and analysis methods. Recent studies have suggested that loose mix oven aging at 95 deg C is the most promising long-term aging method to simulate field aging. This study has developed a means to determine laboratory aging durations for asphalt mixtures that best reflect the time, climate, and pavement depth for a given pavement location in the United States. A rigorous kinetics model together with laboratory experimental results demonstrate that the laboratory aging duration that is needed to match a given field condition is independent of material-specific kinetics. Project-specific laboratory aging durations that match field aging at various pavement depths were determined for a broad set of materials. The project-specific aging durations were used to calibrate a kinetics-derived climatic aging index (CAI) that was then used to determine the laboratory aging duration to match field aging at any location of interest. The CAI-determined aging durations at 95 deg C were used to generate aging duration maps for the United States for three field ages (four years, eight years, and 16 years) to match field aging at three depths (6 mm, 20 mm, and 50 mm).

Fluorescence Microscopy for Determining Diffusion Coefficient between Virgin and Aged Asphalt Binders

Tue, 02/26/2019 - 21:31
Fluorescence Microscopy for Determining Diffusion Coefficient between Virgin and Aged Asphalt Binders
by Ding,Y; Huang,B; Shu,X; Zhu,X.
2018.
Asphalt Paving Technology 2018: Journal of the Association of Asphalt Paving Technologists - Jacksonville, Florida, March 18-21, 2018.
US6 AFN___ 2018P15 - MAIN


Diffusion between virgin and aged asphalt plays a critical role in ensuring a final uniform asphalt binder in mixtures containing recycled asphalt pavement (RAP). Understanding the diffusion phenomenon and determining the diffusion coefficient have a significant effect on asphalt mix design and asphalt mixture performance. In this study, a new method was proposed to utilize fluorescence microscopy to determine the diffusion coefficient of aged RAP binder in recycled mixtures. First, Fick’s second law was applied to quantify the diffusion process in a two-layered virgin-aged binder model and to obtain the analytical solution to the distribution of virgin and aged binders. Then, fluorescence microscopy was used in the laboratory to differentiate between virgin and aged binders and to back-calculate their concentrations from fluorescence image. The diffusion coefficient was determined by fitting the analytical solution to the laboratory concentration measurements. Comparison of the diffusion coefficient by the proposed method and that using the dynamic shear rheometer (DSR) method from the literature shows that the diffusion coefficient determined by fluorescence microscopy was of the same magnitude to, but slightly lower than, that by DSR method. The diffusion coefficient was also predicted using another theoretical method – free volume theory. Parameters describing the asphaltic model in the free volume theory were determined from analysis of the chemical structure of asphalt, viscoelastic relaxation properties, and glass transition temperature of asphalt as well as from the diffusion coefficient measured from laboratory experiments. Diffusion coefficient predicted by the free volume theory shows that diffusion coefficients of asphalt were closely dependent on temperature and asphalt type. A diffusion simulation was performed on plant mixtures using the diffusion coefficient obtained from fluorescence microscopy. The results showed that an almost complete diffusion was achieved within five minutes in a hot-mix asphalt mixture resulting in uniform asphalt film.

Impact of Various Crumb Rubber Modifications on Asphalt Binder and Mixture Properties

Mon, 02/25/2019 - 22:34
Impact of Various Crumb Rubber Modifications on Asphalt Binder and Mixture Properties
by Balamurugan,SS; Mohammad,LN; Daly,WH; Negulescu,I; Cooper,SB III; Cooper, SB Jr; Baumgardner,GL.
2018.
Asphalt Paving Technology 2018: Journal of the Association of Asphalt Paving Technologists - Jacksonville, Florida, March 18-21, 2018.
US6 AFN___ 2018P14 - MAIN


The price of asphalt binder continues to rise, state agencies are looking for sustainable ways to reduce the cost of asphalt pavements without compromising performance. One such alternative is the use of crumb rubber, derived from waste tires, in binders of asphalt mixtures. Blending virgin asphalt binder with ambient or cryogenic ground crumb rubbers along with additional modifiers to produce sustainable asphalt mixtures was studied. The modifiers evaluated include E-rubber (free flowing rubber pellets), SBS, sulfur, and R-polymer (reactive polymer polyolefin blend coated micronized rubber particles). Thermogravimetric analysis was used to determine the natural rubber to synthetic rubber ratio in te ground tire rubbers. Gel permeation chromatography was used to investigate the molecular structure and changes occurring in the asphalt binder on blending with rubber/modifier. Scanning electron microscopy was used to examine the physical nature of the binder blends. All of the binder blends were evaluated using the multiple stress creep recovery test. Mixtures prepared from modified binders were characterized using semi-circular bend (SCB) test at intermediate temperature and Hamburg wheel-tracking (LWT) test. Correlation of physical properties of crumb rubber modified asphalt binder with apparent molecular weight f binder components was examined. Asphalt mixtures containing ambient or cryogenic ground crumb rubber additives did not exhibit improved mixture intermediate temperature cracking performance as compared to conventional mixture as measured by SCB test Jc value. Addition of elastomeric high molecular weight polymer additives improved MSCR test results of binder blends when compared to rubber blends with no additional polymer additives. Addition of E-rubber or R-polymer to the asphalt binder improved SCB intermediate temperature test results of the corresponding mixtures. It was noted that the presence of high molecular weight elastomeric species in asphalt binder blends is necessary to obtain acceptable intermediate temperature cracking performance. Presence of crumb rubber in asphalt binder contributed to the increase in percent high molecular weight species that provided an enhanced mixture rut resistance.

A Direct Shear Approach to Assess the Interface Bonding Performance

Mon, 02/25/2019 - 22:34
A Direct Shear Approach to Assess the Interface Bonding Performance
by Das,R; Mohammad,LN; Elseifi,M; Cao,W; Cooper,SB.
2018.
Asphalt Paving Technology 2018: Journal of the Association of Asphalt Paving Technologists - Jacksonville, Florida, March 18-21, 2018.
US6 AFN___ 2018P13 - MAIN


The objective of this study was to investigate the effects of various factors affecting bond strength between hot mix asphalt (HMA) overlay and underlying pavement layers in the field. The effect of interface bonding on short-term pavement performance was also evaluated. A list of candidate HMA field rehabilitation projects was identified across the United States, representing different traffic and environmental conditions. These projects included the rehabilitation of new, existing, and milled HMA pavements, and PCC pavements. Each field project involved at least one slow setting and one rapid setting non-tracking tack coat material, thereby creating one or more pairs of tack coats for comparison. The HMA overlay construction used different types of tack coat materials at various residual application rates. Specimens were cored from the evaluated test sections at different service times to determine the interface shear strength (ISS) according to AASHTO TP 114, “Standard Method of Test for Determining the Interlayer Shear Strength of Asphalt Pavement Layers.” Results of this study showed the ISS was largely dependent on the type of pavement surface (i.e., HMA vs. PCC) receiving tack coat, and pavement surface texture (i.e., milled vs. non-milled). In general, milled HMA surface yielded the highest ISS, followed by new HMA, existing HMA, and PCC surface types. Non-tracking rapid setting tack coats with stiff base asphalt cement exhibited the highest ISS compared to slow setting tack coats. With respect to the effect of service time, ISS increases with service time due to tack coat curing effect and densification of overlays. Laboratory measured ISS values correlated well with short-term cracking performance of field pavements. Results presented herein were part of NCHRP Project 9-40A on te “Field Implementation of the Louisiana Interface Shear Strength Test.”

Assessment of Various Approaches to Determining Binder Bending Beam Rheometer Low Temperature Specification Parameters from Dynamic Shear Rheometer Test

Mon, 02/25/2019 - 22:34
Assessment of Various Approaches to Determining Binder Bending Beam Rheometer Low Temperature Specification Parameters from Dynamic Shear Rheometer Test
by Oshone,M; Dave,EV; Daniel,JS; Rowe,GM.
2018.
Asphalt Paving Technology 2018: Journal of the Association of Asphalt Paving Technologists - Jacksonville, Florida, March 18-21, 2018.
US6 AFN___ 2018P12 - MAIN


The current asphalt binder performance grading system employs Dynamic Shear Rheometer (DSR) testing to determine high and intermediate temperature rheological properties. In recent years, the ability to measure DSR instrument compliance has allowed researchers to reliably measure low temperature binder properties as well. Low temperature characterization using DSR requires substantially smaller amount of binder as compared to the currently employed binder testing method, the Bending Beam Rheometer (BBR). For these reasons and the possibility of using one piece of equipment for full characterization of asphalt binders, previous research has investigated DSR as an alternative to replace BBR testing by determining equivalent creep stiffness (S) and slope (m-value) from shear complex modulus. Different methods have been proposed to determine BBR specification parameters from DSP data and their viability has been evaluated primarily for virgin binders. The objective of this paper is to further assess the applicability of different methods to determine S and m-values from DSR data for four neat binders as well as extracted and recovered binders from eighteen different mixture samples. The variables within the mixtures include lab versus plant production, aggregate size and gradation, binder PG and source, and recycled material type and content. The methods employ different interconversion methods, ranging from exact interconversions to regressive-based estimates. The shear relaxation modulus or creep stiffness and slope are correlated to S and m-value measured from BRR testing. The study also investigates the impact and differences due to use different interconversion methods. The results show that the Christensen approximate interconversion is adequately able to predict parameters from DSR results that are equivalent to S and m-value determined from BRR testing. The exact interconverted shear creep stiffness and shear relaxation modulus using generalized Maxwell model are compared to lab measured S and m-values, results show that a linear relationship exists between these parameters. Finally, a simple equation is developed to enable estimation of BBR S and m-value from a single point measurement of complex shear modulus and phase angle. This contribution is expected to have a practical use by providing a platform to estimate low temperature specification parameters from a single point DSR measurement.

Influence of Asphalt Binder Formulation and Source on the Performances of Binders with the Same Continuous PG

Mon, 02/25/2019 - 22:34
Influence of Asphalt Binder Formulation and Source on the Performances of Binders with the Same Continuous PG
by Mogawer,WS; Austerman,AJ; Stuart,KD; Marasteanu,M; Nazzal,M.
2018.
Asphalt Paving Technology 2018: Journal of the Association of Asphalt Paving Technologists - Jacksonville, Florida, March 18-21, 2018.
US6 AFN___ 2018P11 - MAIN


The objectives of this research study were to determine the effects of asphalt binder formulation and source on the performance of binders with the same continuous Performance Grade (PG) using recently developed asphalt binder and mixture tests and provide recommendations, if needed, concerning the following: (1) the effect of asphalt binder formulation and source on performance, (2) the current PG specification and (3) the tests used in this study. Various asphalt binders were formulated so they would have the same continuous high and low PGs which would meet the AASHTO M 320 specifications for a PG 58-28 binder. Other binders were formulated to meet the AASHTO M 320 specifications for a PG 64-28 binder. Thus, theer were two target PGs. Three sources of straight run asphalt binders were obtained, although one source was eliminated because for most of the modifiers obtained for this study, the target PGs could not be met. This showed that whether a continuous PG can be achieved through modification is dependent on binder source and modifier type. The modifiers used in the formulations consisted of two sources of re-refined engine oil bottoms (REOB), aromatic oil, polyphosphoric acid (PPA) and an air-blown asphalt, either alone or in combination. It is believed these modifiers are becoming more commonly utilized to supply the required PG asphalt binders for today’s paving industry. Asphalt binder formulation and source had an effect on fatigue cracking, cohesion, adhesion, moisture susceptibility and non-load associated cracking even though the binders had closely matching continuous PGs based on high and low temperature properties. They had no effect on rutting performance except when measured by the MSCR, or thermal cracking performance except when measured by the EBBR. In conclusion, not all asphalt binders with the same continuous PG will perform identically in regard to all distresses.

Limiting Strain Distribution Criteria for Perpetual Pavement Design Using AASHTOWare Pavement ME Design

Mon, 02/25/2019 - 22:34
Limiting Strain Distribution Criteria for Perpetual Pavement Design Using AASHTOWare Pavement ME Design
by Castro,A; Tran,N; Gu,F; Timm,D; Wagner,C.
2018.
Asphalt Paving Technology 2018: Journal of the Association of Asphalt Paving Technologists - Jacksonville, Florida, March 18-21, 2018.
US6 AFN___ 2018P10 - MAIN


Perpetual asphalt pavement designs have been based on controlling horizontal strains at the bottom of the asphalt layer and vertical strains on top of the subgrade to prevent bottom-up fatigue cracking and subgrade rutting, respectively. Traditionally, single strain thresholds had been used as limits where damage accumulation begins and propagates. The concept of strain distribution was introduced at the National Center for Asphalt Technology (NCAT), and it was to better represent the wide response spectrum in asphalt pavements caused by the different loading and environmental conditions. The concept was developed based on information and data collected from the NCAT Pavement Test Track, and from this a limiting strain distribution was created to assist with perpetual pavement design. Several studies analyzed the criteria using pavement responses calculated from PerRoad predicted strains in Test Track sections and existing perpetual pavements. A limitation of the AASHTOWare Pavement ME Design software is its inability to output the pavement responses necessary for perpetual pavement design. The objective of this study was to analyze pavement response data predicted from an integration of the AASHTOWare Pavement ME Design software outputs and a JULEA based program developed at NCAT to create a limiting strain distribution for perpetual pavement design using the AASHTOWare Pavement ME Design software. Strains were calculated for Test Track sections using these tools and based on the results a limiting strain distribution was then further evaluated using eight sections that won Perpetual Pavement Awards. Results showed that the horizontal strain distribution obtained from Test Track sections could differentiate the sections with cracking and the sections that did not crack. In the further evaluation, the horizontal strain distribution from the perpetual pavements did not exceed the limiting strain distribution developed from the Test Track sections, except for a section which surpassed it by a small margin at the 80th percentile and higher percentiles. Vertical strains were also determined for these pavements and the current 200 microstrains at 50th percentile design criteria was met by all the sections.

Assessment of Permanent Deformation Properties of In-Place Recycled Pavement Mixtures

Tue, 02/19/2019 - 20:34
Assessment of Permanent Deformation Properties of In-Place Recycled Pavement Mixtures
by Bowers,BF; Diefenderfer,BK; Schwartz,CW.
2018.
Asphalt Paving Technology 2018: Journal of the Association of Asphalt Paving Technologists - Jacksonville, Florida, March 18-21, 2018.
US6 AFN___ 2018P09 - MAIN


Cold in-place recycling (CIR), cold central plant recycling (CCPR), and full depth reclamation (FDR) are techniques that can be used to rehabilitate deteriorated pavements or used in new pavement construction projects. Use of these techniques has been found to be both fiscally and environmentally beneficial. However, there is a lack of literature that examines the mechanistic behavior of these mixtures, particularly when it comes to asphalt mixture-related test methods. This paper presents a comprehensive analysis of data from repeated load permanent deformation (RLPD) testing, a laboratory test that describes a mixture’s rutting behavior, conducted on bituminously stabilized CIR, CCPR, and FDR mixtures. The mixtures were collected as a part of NCHRP 9-51, Material Properties of Cold In-Place Recycling and Full-Depth Reclamation Asphalt Concrete for Pavement Design. The permanent deformation behavior of specimens from 23 projects sampled between 12 and 24months after construction is presented. The impact of stabilizing or recycling agent as well as the presence of chemical additives on the permanent deformation behavior was considered. Density, one of the most prevalent factors in field-based quality control and acceptance of cold recycled mixes was also examined with respect to its impact on permanent deformation behavior.

Nondestructive Full Coverage Asphalt Stripping Detection Using 3D Radar

Tue, 02/19/2019 - 20:34
Nondestructive Full Coverage Asphalt Stripping Detection Using 3D Radar
by Dai,S; Hoegh,K; Ghosh,D.
2018.
Asphalt Paving Technology 2018: Journal of the Association of Asphalt Paving Technologists - Jacksonville, Florida, March 18-21, 2018.
US6 AFN___ 2018P08 - MAIN


Since subsurface stripping extent is important for maintaining the road network, Minnesota Department of Transportation (MnDOT) uses forensic measures such as coring. The destructive nature and lack of coverage provided by this accepted method makes finding nondestructive methods for detecting stripping of in situ asphalt pavements an important need for MnDOT and many other agencies. Stripping between hot mix asphalt layers can cause premature failure of pavements. Knowledge of the lateral location, depth and extent of stripping can affect the timing and type of pavement preservation, maintenance, or rehabilitation. This paper reports on use of a DX1821 antenna to collect data at a frequency step of 20 MHz ranging from 50 MHz to 3050 MHz with a dwell time of 7.52 microseconds using a GeoScope Mk IV control unit on a full-scale asphalt pavement constructed at the National Center for Asphalt Technology (NCAT) test track with built-in stripping. Signals from the known stripped and non-stripped locations were used to evaluate statistical and energy based approaches. It is shown that a maximum energy ratio method, an approach that has been successfully applied to acoustic emission applications in the past, can improve signal clarity for stripping detection using ground penetrating radar (GPR). These results are confirmed using highway speed measurements at the Minnesota Road Research Facility with core validation.

Pages