摘要
对干湿交替作用下的混凝土,研究其不同粉煤灰掺量(0、20%、40%、60%)、不同水胶比(0.30、0.35和0.40)和不同养护制度(28、90 d)对氯离子传输行为的影响规律。试验表明:粉煤灰掺量和水胶比对氯离子浓度的影响规律随着干湿交替次数的增加而改变,循环5次时粉煤灰掺量为20%的氯离子浓度最大,而15次时掺量为40%的氯离子浓度最大;循环5次时水胶比为0.40的氯离子浓度最大,循环次数大于10次时水胶比为0.35的氯离子浓度最大;不同循环次数下都是养护28 d的氯离子浓度大于养护90 d的氯离子浓度。混凝土干湿交替作用下氯离子传输规律研究对混凝土结构耐久性和寿命预测具有现实意义。
The transmission law of chloride ions of High Performance Concrete under dry-wet cycling is studied on different fly ash proportion（0,20%,40%,60%）,different ratio of water to binder（0.30,0.35,0.40）and different curing time（28,90 d）.Experiment results show that the influence of fly ash proportion and water to binder ratio on chloride ions concentration changes with the increase of dry-wet cycling times.When testing in the same depth,after cycling 5 times,concrete with 20% fly ash content has maximum chloride ions concentration,while after cycling 15 times,concrete with 40% fly ash content has maximum concentration,after cycling 5 times,concrete with 0.40 water to binder ratio has maximum concentration,and concrete with 0.35 water to binder ratio has maximum concentration when cycling times are more than 10 times.Concrete after 28 d curing always has larger chloride ions concentration compared with concrete after 90 d curing,no matter how many cycling times.The research of chloride ions transmission law under dry-wet cycling of ash concrete possesses the real meaning to the structure durability and life prediction of concrete.
出处
《混凝土》
CAS
CSCD
北大核心
2011年第11期1-3,7,共4页
Concrete
基金
国家"973"项目(2009CB623200)
国家博士后基金(20090461107)
关键词
粉煤灰混凝土
干湿交替
氯离子传输
结合能力
fly ash concrete
dry-wet cycling
transmission of chloride ion
binding capability
