利用NEL法研究再生混凝土抗氯离子渗透性能  

Study on anti-chloride ion permeability of recycled aggregate concrete by NEL method

作　　者：罗伯光[1,2] 覃荷瑛[1,2] 

机构地区：[1]桂林理工大学广西岩土力学与工程重点实验室,广西桂林541004 [2]桂林理工大学土木与建筑工程学院,广西桂林541004

出　　处：《混凝土》2014年第9期41-44,共4页Concrete

基　　金：广西自然科学基金项目(2013GXNSFAA019299);广西岩土力学与工程重点实验室资助课题(No.11-CX-04);桂林理工大学人才基金(002401003391)

摘　　要：以不同再生粗骨料替代率、不同配合比、不同矿物掺和料为主要因素,通过试验,制作了几组再生混凝土试块,利用NEL法对试块进行了抗氯离子渗透性能的测定,以考察这几个因素对再生混凝土抗氯离子渗透性能的影响规律。试验结果表明,随着再生粗骨料替代率的增加,再生混凝土试块的氯离子渗透系数增大;三种矿物掺和料均降低了再生混凝土试块的氯离子渗透系数,其中以硅灰效果最好,粉煤灰和矿渣微粉的效果相差不多;随着水灰比的增加,矿物掺和料对减少再生混凝土氯离子渗透系数效果越明显。Some recycled concrete specimens with different replacement rate of recycled coarse aggregate,different water to binder ratio,different type of mineral admixture are analyzed by experiments in order to study on anti-chloride ion permeability of recycled aggregate concrete by NEL method. The results showed that the diffusion coefficient of chloride ion of recycled concrete were large with the increment of the replacement rate of recycled coarse aggregate.Three kinds of mineral admixtures can all enhance anti-chloride ion permeability of recycled aggregate concrete,silica fume had the best effect and the effect was not much difference between slag and fly ash.With the increase of water to binder ratio,the effect of mineral admixture on the reduction of the chloride diffusion coefficient of recycled concrete was more obvious.

关 键 词：矿物掺合料 再生混凝土 抗氯离子渗透性能 NEL法 

分 类 号：TU528.01[建筑科学—建筑技术科学]