Concrete is an essential construction material; however, the production of cement (a component of concrete) produces large quantities of carbon dioxide. These large quantities of anthropogenic carbon dioxide (along with other reasons) encouraged a shift toward the use of supplementary cementitious materials (SCMs) such as fly ash or granulated blast furnace slag, which are byproducts of other industries. Ground waste glass is another possible SCM that, at the proper particle size and depending on the chemical composition of the glass, can produce concrete with comparable or higher strength than concrete made without SCMs. However, there is a lack of research related to using glass as an SCM in structural concrete with steel reinforcement. In this study, nine concrete mixtures were created using various combinations of two fly ashes and three different types of ground waste glass and were compared to a control batch of concrete without SCMs. Three 6 ft beam specimens were fabricated from each of these ten mixtures (30 beams total) and the flexural behavior was investigated. Results from the 90-day flexural testing demonstrated that three out of the seven mixtures containing ground glass had higher average flexural strengths than the control beams (between 0.5-4% higher). The remaining beams made with glass had approximately 2-5% less flexural strength compared to control beams. However, there was no statistically significant difference in flexural strength between each of the nine SCM mixtures and the control beams without SCMs. Additionally, the beams made with ground glass had a lower displacement at failure in all cases when compared to the control beams.
University of Minnesota M.S. thesis. May 2020. Major: Civil Engineering. Advisors: BENJAMIN DYMOND, MARY CHRISTIANSEN. 1 computer file (PDF); 141 pages.
Flexural Performance Of Reinforced Concrete Beams Fabricated With Ground Glass And Fly Ash.
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