Research on the appearance quality and performance of composite limestone powder fair-faced concrete
The rheological properties,compressive strength,chloride ion impermeability,and appearance quality of fair faced concrete with a ternary cementitious system consisting of limestone powder,mineral powder,and cement under different proportions of admixtures were studied using the simple center of gravity design method.The results show that limestone powder is beneficial for reducing the yield stress of concrete,improving flowability,while mineral powder is beneficial for increasing the plastic viscosity of concrete and improving its resistance to segregation.The addition of appropriate amount of limestone powder and mineral powder can improve the chloride ion permeability of fair faced concrete,enhance the appearance uniformity and color of fair faced concrete,but the higher the amount of admixture,the lower the compressive strength of concrete.When the content of limestone powder is 10％～15％,the content of mineral powder is 0～15％,and the content of cement is 85％～88％,the composite limestone powder fair faced water concrete has good workability and appearance quality while meeting the requirements of 3 d and 28 d compressive strength,and chlo-ride ion impermeability.
limestone powderfair faced concretesimple center of gravity design methodrheological properties
万方数据
维普
