Jeudi, 19 Septembre, 2019 - 15:45
A revised and updated version of Design, Construction, and Performance of Heavy-Duty Mixes (QIP-123), originally published by the National Asphalt Pavement Association in 2002.Heavy duty mixes are needed in any pavement structure subjected to severe loading conditions as evidenced by the number and weight of heavy loads, heavy static loads, and/or high tire...
Jeudi, 19 Septembre, 2019 - 15:45
Post-tensioning has evolved to become the construction method of choice for many large structures, including bridges. However, instances of corrosion-induced fracture of wires and strands and resultant tendon failures have occurred as a consequence of either chemically or physically deficient grout (or a combination of these), where the former involves elevated...
Jeudi, 19 Septembre, 2019 - 15:45
Post-installed reinforcement is used to connect a new concrete member to an existing concrete structure. Typically, uncoated rebar post-installed with a chemical adhesive is used in these applications, which may lead to corrosion. Departments of Transportation and local bridge owners have used and continue to use epoxy-coated rebar in post-installed...
Jeudi, 19 Septembre, 2019 - 15:30
Under this investigation, researchers conducted a search for literature relevant to pavement design and asphalt mixture design of Low Volume Roads (LVRs). This investigation was complemented with a web-based survey submitted to state agencies and industry in an attempt to answer some questions that many practitioners may have related to the state-of-the-...
Mercredi, 28 Août, 2019 - 19:15
Advanced connected and automated vehicle (CAV) technologies can be utilized to achieve precise vehicle trajectory control and render unprecedented opportunities to improve transportation system performance in safety, mobility and sustainability. However, it is quite challenging to fully realize these advantages from CAV in mixed traffic environment due to...
Mercredi, 28 Août, 2019 - 19:15
Scour at bridge substructure units can cause undermining of footings and exposure of piles, which can lead to bridge failure. Monitoring of the streambed elevations around a scour critical bridge to identify whether or not scour is occurring during a high-flow event is critical. Working on or near the water may be dangerous during these events. The study...
Mercredi, 28 Août, 2019 - 19:00
Data standardization is recognized in many disciplines as a critical aspect of data stewardship. Establishing and implementing data specifications increases the usefulness of data collection efforts and facilitates analysis techniques. With the advent of large quantities of machine-generated data, the use of standardized data formats feeds opportunities for...
Mercredi, 28 Août, 2019 - 19:00
Bridge performance measures are important components of any successful Bridge Management System. Different types of performance measures have been developed for various purposes. The types of performance measures are usually a reflection of an agency’s goals. The bridge health or condition index is a type of performance measure used by agencies interested...
Mercredi, 28 Août, 2019 - 19:00
A toolkit for responding to natural disasters is outlined in Regional Resilience Toolkit: Five Steps to Build Large Scale Resilience to Natural Disasters, a report by the U.S. Environmental Protection Agency. The toolkit describes a coordinated process for meeting many different state and federal planning requirements and provides guidance on communication and...
Mercredi, 28 Août, 2019 - 19:00
Dynamic and responsive transportation systems are a core pillar of equitable and sustainable communities. Achieving such systems requires comprehensive mobility data, or data that reports the movement of individuals and vehicles. Such data enable planners and policymakers to make informed decisions and enable researchers to model the effects of various...
Mercredi, 28 Août, 2019 - 19:00
The objective of this synthesis is to document practices used by state departments of transportation (DOTs) for designing and maintaining roadsides adjacent to urban freeways. The synthesis focuses on high visibility freeway roadsides with limited pedestrian access. These areas often have wide medians, interchanges, and overpasses. Information used in this...
Mercredi, 28 Août, 2019 - 18:45
This paper compares the Public Private Partnership model for funding of infrastructure projects with an alternative approach, the Regulatory Asset Base model. It considers whether the ability to levy user charges is necessary to ensure low financing costs, or whether these stem from other factors. The paper is part of a series of 19 papers and a synthesis...
