United States Department of Transportation
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Abstract:The researchers found that the effects of changing concrete components on concrete properties vary with the amount and the type of each specific component changed. The type of coarse aggregate had the greatest effect on all concrete properties compared to the rest of the components changed in this study. However, the magnitude of that effect varied with each property. Coarse aggregate type affected concrete modulus of elasticity with much larger magnitude compared to other concrete properties. Modulus of rupture and splitting tensile strength were most significantly affected by changing cementitious material composition. Therefore, it was observed that the effect of cementitious material composition on concrete tensile strength associated with tensile failure was larger than its effect on other concrete properties not associated with tensile failure, including compressive strength, Poisson’s ratio, dynamic modulus and coefficient of thermal expansion (CTE). Researchers found pavement thickness varies with coarse aggregate source and the use of supplementary materials, especially slag, which improved pavement performance by decreasing the critical thickness required. For most cases, using different sources of Portland cement, slag cement, and fine aggregate did not have a large effect on the pavement thickness. The pavement’s critical thickness varied with the source of fly ash. However, this effect was not as large as that associated with cementitious material type or coarse aggregate type.
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