水泥基材料中火山岩火山灰反应的效益

Effect of Pozzolanic Reaction of Volcanic Rocks in Cement-based Material

基于水泥基材料强度由水泥的水化反应和火山灰质材料的火山灰反应(二次水化反应)共同构成之概念,测试掺火山岩粉末的水泥砂浆力学强度计算,表征单位火山岩的火山灰反应之效益。结果表明火山岩火山灰反应的效益随着水泥基材料中掺量增大而减小,同掺量情况下随着水化时间延长而减小。这些关系可用拟合回归方程量化表达。研究的火山岩火山灰反应效益可知大多数情况下火山岩替代水泥会对水泥基材料强度有降低影响,掺量越大强度降低幅度也越大。研究成果有助于工程上优化选择火山灰质材料在水泥基材料中的应用。

Based on the concept that strength of cement-based material results from hydration of cement and pozzolanic reaction of pozzolans（secondary-hydration reaction）, the mechanical strength of cement mortar blended with volcanic rock powder was tested, and effect of pozzolanic reaction of volcanic rock was calculated by using the strength values. The results show that the effect of pozzolanic reaction for volcanic rocks in cement-base material decreases as the dosage of volcanic rock increases and the hydration time prolongs. The relationships among them are expressed quantitatively by using fitting regression equation. It finds out that from the effect values of pozzolanic reaction, in most cases, replacement of cement by volcanic rocks results in reducing impacts on strength of cement-based material, and the higher the replacement volume is, the greater the strength decreases.