| This thesis presents data from a laboratory study on the effects of intergrinding 15% and 22% limestone in Portland cement on the durability of concrete with and without supplementary cementitious materials (SCM) such as fly ash, slag, and silica fume. C-XL, C-2, F-2, and R-2 classes of concrete mixture were produced with different replacement levels of SCM and tested to determine the strength and durability of the concrete. In addition, several mortar mixes were produced to determine if limestone changes the form and extent of deterioration due to sulfate attack, and whether limestone reduces the efficacy of measures for improving sulfate resistance. Accelerated mortar bar tests were also conducted to determine the effects and behavior of limestone addition in cement with regards to alkali-silica reaction (ASR).;Testing methods and data collection were done in accordance with ASTM and CSA test methods and procedures. Most of the results show that concrete produced with cement containing up to 15% limestone had comparable performance to concrete produced with Portland cement. However, inferior performance was observed for concrete produced with cement containing 22% limestone. The sulfate resistance of mortars produced without SCM decreased with increasing limestone content, but mortars containing fly ash or slag showed satisfactory sulfate resistance regardless of the limestone content of the cement. The level of limestone in the cement does not appear to affect the expansion due to alkali-silica reaction nor the efficacy of SCM in terms of controlling expansion. |
