摘要
采用自然浸泡法研究了矿物掺合料对C50自密实混凝土工作性能和抗氯离子渗透性能的影响,结果表明:对于单掺粉煤灰混凝土试件,氯离子扩散系数随粉煤灰含量的提高先减少后增加,28d龄期时粉煤灰含量为30%的试件氯离子扩散系数最低,而90 d龄期时粉煤灰含量为40%的试件氯离子扩散系数最低;对于单掺矿粉混凝土试件,氯离子扩散系数随胶凝材料中矿粉含量的提高而降低,当矿粉含量由50%增加至60%时氯离子扩散系数降低的幅值并不明显;对于复掺混凝土试件,氯离子扩散系数随复合掺合料中粉煤灰含量的提高先减少后增大,28d龄期时粉煤灰含量为10%的混凝土氯离子扩散系数最低,而90d龄期时粉煤灰含量为20%的混凝土氯离子扩散系数最低。
The influence of mineral admixture on workability of fresh concrete and chloride ion permeability resistance of hardened concrete for C50 self-compacting concrete was investigated by means of the Natural Immersion Test.The results showed that the chloride diffusion coefficient in fly ash concrete decreased first and then increased with increasing fly ash content in cementitious,when fly ash content was 30% or 40%,it got the lowest value at 28 days or 90 days,respectively.The chloride diffusion coefficient in specimens decreased with increasing the slag content in cementitious,but it changed little when the replacement was in ranges of 50% to 60%.Furthermore,for the specimens which replaced by fly ash and slag,the chloride diffusion coefficient decreased first and then increased with increasing the fly ash content in complex cementitious,and when fly ash content was 10% or 20%,it got the lowest value at 28 days or 90 days,respectively.
出处
《混凝土》
CAS
CSCD
北大核心
2012年第10期18-20,25,共4页
Concrete
基金
科技部专项资金(2011EG124277)
关键词
矿物掺合料
自密实混凝土
氯离子扩散系数
mineral admixture
self-compacting concrete
chloride diffusion coefficient
