蒸养粉煤灰混凝土抗氯离子渗透性能研究  

Performance of chloridion permeability resistance of steamed fly ash concrete

作　　者：何智海 刘运华[1] 

机构地区：[1]郴州市建设工程质量安全监督管理站,湖南郴州423000

出　　处：《混凝土》2008年第4期4-7,共4页Concrete

摘　　要：通过RCM、ASTMC1202和可蒸发水含量法互相补充,研究了粉煤灰掺量对蒸养粉煤灰混凝土抗氯离子渗透性能的影响。试验结果表明:蒸养混凝土抗氯离子渗透性能低于相应标养混凝土,随着粉煤灰掺量的增加,混凝土的抗氯离子渗透性能得到了明显改善,同时也降低了蒸汽养护制度对混凝土抗氯离子渗透性能的不利影响。在RCM试验中,标养混凝土粉煤灰掺量应控制在30%以内,过高反而会降低混凝土的抗氯离子渗透性能。对于蒸养混凝土,粉煤灰掺量为40%时,混凝土的氯离子扩散系数继续下降,其测试结果与对混凝土渗透性能影响较大的气孔及粗毛细孔孔隙率的变化规律一致。According to the supplement among methods of RCM.ASTM C1202 and content of evaporative water,fly ash amount affecting chloridion permeability resistance of steamed fly ash concrete is studied.The results show the chloridion permeability resistance of steamed fly ash concreteis worse than that of corresponding standard curing concrete.As the fly ash increasing,the chloridion permeability resistance is improved obviously, and the disadvanced effects caused by steam-curing system on the chloridion permeability resistance is lowered down.In the experiment of RCM, the fly ash amount of standard cruing concrete i s control led fewer than 30%.The Iarger fly ash amount can lower the chl ori di on permeability resi stance.The diffusion coffecient of chloridion resi stance decreases continuously for the fly ash i s 40%.The accordant reaction regulation with both the pore and rough porosity i s tested, which can affect the permeability largety.

关 键 词：粉煤灰 混凝土 孔隙率 氯离子 渗透性 

分 类 号：TU528.01[建筑科学—建筑技术科学]