矿物掺合料对混凝土强度和抗氯离子扩散性能的影响

就单掺粉煤灰、单掺矿渣微粉,以及粉煤灰与矿渣微粉双掺对混凝土强度和氯离子扩散系数的影响进行了试验研究。结果表明:粉煤灰和矿渣微粉的掺入明显降低了混凝土的早期强度和氯离子扩散系数,但混凝土后期强度发展良好,且两者以适当的比例复掺更有利于混凝土后期强度的增长和氯离子扩散系数的降低;就改善氯离子扩散的效果而言,矿渣微粉较粉煤灰好。

MINERAL ADMIXTURE INFLUENCE ON THE STRENGTH AND CHLORIDE-ION-RESISTANCE DIFFUSION OF CONCRETE

The influence on strength and Cl~- diffusion coefficient of concrete by adding fly ash and slag powder either alonely of them or together with them were studied. The results show that the early strength and C1- diffusion coefficient of concrete are obviously lowered by adding fly ash and slag powder, but the development of later strength and Cl~- diffusion coefficient are very good especially for adding with fly ash and slag powder together in a suitable proportion. Meanwhile, as to the Cl~- diffusion coefficient improvement effect, the slag powder is better than fly ash.