Les exposés écrits du congrès ont été publiés dans la langue dans laquelle ils ont été soumis à l’ATC.
A limited number of studies evaluated the suitability of recycled glass powder (GP) as a supplementary cementitious material (SCM) in portland cement concrete (PCC) mixes, and there is a limited use of GP in PCC mixes in Canada. With a motivation to reduce waste, a laboratory testing program was undertaken by Manitoba in 2023-2024 constituting coarse aggregate from four sources, two types of portland cement and five different combinations of GP and fly ash for each cement and aggregate type. The test results indicated that GP has no beneficial impact on the compressive strength, modulus of rupture (MoR) and modulus of elasticity (MoE) of concrete containing General Use (GU) cement. The trends of a durability property of concrete containing GU cement were inconsistent between ages of concrete at the time of testing and among varied glass powder contents in the concrete mixes. For the concrete containing General Use Limestone (GUL) cement, 5% GP (and 15% fly ash) content has shown to provide some beneficial effects as compared to the concrete with no GP and 20% fly ash content (the reference mix). A gradual decrease in concrete quality was noted with further increase in GP (and decrease in fly ash) content in concrete mixes containing GUL cement. The quality of concrete mixes containing GUL cement were shown to be inferior to the concrete having GU cement. This result also confirms the previous findings by MTI that properties of PCC containing GU and GUL cements are not equivalent. Such findings raise question about the environmental benefit of GUL cement and suitability of recycled GP as a SCM. This paper presents the details of the testing, analyses and findings.