Center for By-Products Utilization EFFECTS OF CEMENTITIOUS MATERIALS ON THE COEFFICIENT OF THERMAL EXPANSION OF CONCRETE

Wisconsin Department of Transport (WisDOT) permits use of Grade A-FA (70% cement plus 30% Class C fly ash) concrete mixtures for pavement construction. This paper discusses a laboratory investigation performed to study the effects of the cementitious materials such as portland cement, ASTM Class C fly ash, ground granulated blast furnace slag (GGBFS), blends of cement and fly ash, and cement plus GGBFS on the coefficient of thermal expansion (CTE) of typical concrete paving mixtures. For this study, nine concrete mixtures were made by using two sources of portland cement, two sources of ASTM Class C fly ash, and one source of GGBFS. The coarse aggregate used was dolomite, obtained from five different sources in Wisconsin. The CTE of each concrete mixtures was determined on triplicates specimens at the age of 28-day, in accordance with the procedure of AASHTO TP60. The test results showed that the different sources of coarse aggregates had no effect on the CTE of concrete. It further revealed that types and sources of cementitious materials also had a negligible influence on the CTE of concrete mixtures. This paper also discusses the effects of types and sources of cementitious materials on the compressive and splitting tensile strengths of the concrete mixtures used in this investigation.