Studies on Main Properties of Ternary Blended Cement with Limestone Powder and Microsilica

The ternary system of portland cement-microsilica-limestone has been studied by investigating its set and strength behaviours. a number of different cementitious systems comprised of 0, 10, 15, 20, 25, and 30% limestone powder and 0, 4, 6, 8, 10, 12, 14, and 16% microsilica were designed and prepared. the cementitious systems were then characterized by determining their relative workability and measuring their initial and final setting times and also their 7- and 28-day compressive strengths using paste specimens prepared at a constant w/c-ratio of 0.38. total 77-day shrinkage of the systems was also measured. the obtained results reveal that both 7- and 28-day compressive strengths increase with increasing microsilica up to 12% and decrease with increasing the percentage of limestone powder. a comparison of the results confirms the possibility of replacing portland cement by a proportioned mixture of microsilica and limestone powder for enhancing the strength behaviour or producing composite cements containing relatively high proportions of limestone powder with no loss in 7- and 28-day compressive strengths compared to plain cement.