Influence of inactive admixtures on the properties of mass concrete
Large volume concrete structures are thick and massive,with high hydration temperature rise,which can easily form cracks to cause serious structure damage.It investigates the technical effects of large amounts of inactive admixtures on reducing the heat of hydration of concrete,delaying the onset of peak heat of hydration temperatures and reducing the risk of cracking.The technical specifications of three inactive admixtures(dolomite powder,limestone powder and tailings powder)were tested,and their effects on the adiabatic temperature rise,mechanical properties and durability of mass concrete were tested and analysed in 50％fly ash concrete.The fine structure was studied by the ultra-depth three-dimensional microscope.The results of the study show that the inactive admixtures reduce the heat of hydration of the cementitious system to an extent comparable to that of fly ash,resulting in concrete with good workability and durability,at different ages the compressive strength develops steadily.The inactive admixtures effectively slow down shrinkage and cracks in the concrete and reduce the adiabatic temperature rise of the concrete,have the application prospect to replace fly ash.
inactive admixturesmass concretehydration heatadiabatic temperature risemechanical performancedurability
万方数据
维普
