粉煤灰细度对不同强度等级混凝土抗CL^-性能的影响

通过新拌混凝土需水量、抗压强度、CL^-快速渗透试验和5%NaCl溶液浸泡试验,确定不同细度粉煤灰配置的低、中、高强混凝土的抗CL^-渗透能力。结果表明：粉煤灰细度可提高低、中强混凝土的早期强度;高强混凝土的早期强度下降较少;各强度等级混凝土的后期强度普遍提高。粉煤灰细度越高混凝土抗CL^-渗透能力越明显,高水胶比混凝土比低水胶比混凝土更明显。

Influence of Fly Ash Fineness on the Chloride-Penetration resistance of Different strength Grade Concrete

The water requirement,compressive strength, rapid chloride permeability test , immersion test in 5 % NaCl solution were made to confirm the effect of different fly ash finenesses on concrete, especially the resistance to chloride penetration of different strength grade concrete. The results indicate that fly ash can increase the early strength for low and normal concrete, while for the high strength concrete, the early strength was decreased only a little. And for all strength grades concrete, the strength development is rather good. the chloride penetration resistance of all strength grades concrete increases with an increase in the fly ash fineness. And the influence of fly ash finenesses on chloride penetration resistance of concrete in high water/binder ratio is more apparent than that in low water/binder ratio.