To popularize the application of dry-hard concrete in alkali-activated cementitious systems,it used mineral powder and fly ash as cementitious materials and water glass as an alkali activator to prepare alkali-activated dry hard concrete.The mechanical properties of alkali-activated dry hard concrete at different ages were measured,and the linear relationship between 28 d compressive strength and sol ratio was fitted.The time varying law of shrinkage of alkali-activated dry hard concrete with age was analyzed by contact method.The results show that the 1 d and 3 d compressive strength of alkali-activated dry hard concrete can reach 80％and 88.3％of the 28 d compressive strength,the effect of fast hardening and early strength is remarkable,and the 28 d compressive strength reaches 67.8 MPa.The shrinkage rate of alkali-activated dry hard concrete increases with the increase in sol ratio,and the shrinkage rate of 60 d is less than 750.0 × 10-6.The incorporation of fly ash will reduce the early strength of concrete,but it can improve the drying shrinkage performance of alkali-activated dry hard concrete.
关键词
碱激发/干硬性混凝土/抗压强度/干燥收缩/性能规律
Key words
alkali-activated/dry hard concrete/compressive strength/drying shrinkage/performance regularity
维普
万方数据