矿物掺和料对再生混凝土抗氯离子渗透性能的影响研究  

Influence of Mineral Admixture on Anti-chloride Ion Permeability of Recycled Aggregate Concrete

作　　者：罗伯光[1,2] 覃荷瑛[1,2] 

机构地区：[1]广西岩土力学与工程重点实验室桂林理工大学,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：《公路工程》2014年第5期114-118,共5页Highway Engineering

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：试验设计制作了几组掺有不同矿物掺和料、不同配合比的再生混凝土试块,利用加速氯离子渗透性试验对试块进行了抗氯离子渗透性能的测定,以考察常用矿物掺和料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,掺有8%硅灰的再生混凝土试块,其氯离子渗透系数减少12.2%～53.4%;掺有25%的粉煤灰,再生混凝土试块氯离子渗透系数减少7.8%～50.1%;掺有25%矿渣微粉的再生混凝土试块,其氯离子渗透系数减少7.1%～43.9%;可见3种矿物掺和料—粉煤灰、矿渣微粉以及硅灰对再生混凝土的抗氯离子渗透性能均有一定的提高,其中以硅粉的效果最好,粉煤灰次之,矿渣微粉较差。Some recycled concrete specimens with different water to binder ratio are analyzed by experiments in order to study on the influence of the mineral admixture on anti-chloride ion permeability of recycled aggregate concrete by accelerated chloride migration test. The results show that the diffusion coefficient of chloride ion of recycled concrete with 8% silica fume has lower 12. 2% ～ 53. 4% than that of them not with the mineral admixture,with 25% fly ash has lower 7. 8% ～ 50. 1% and with 25% slag has lower 7. 1% ～ 43. 9%. We can see that three kinds of mineral admixtures can all enhance anti-chloride ion permeability of recycled aggregate concrete,silica fume has the best effect,slag is in the second place,and fly ash is in the third place.

关 键 词：矿物掺和料 再生混凝土 抗氯离子渗透性能 加速氯离子渗透性试验 

分 类 号：TU528[建筑科学—建筑技术科学]