不同因素对再生骨料混凝土抗冻性的影响  

Effect of Different Factors on Frost Resistance of Recycled Aggregate Concrete

作　　者：陈德玉[1] 刘来宝[1] 严云[1] 谭克锋[1] 刘欢[1] 

机构地区：[1]西南科技大学四川省非金属复合与功能材料重点实验室,绵阳621010

出　　处：《武汉理工大学学报》2011年第5期54-58,共5页Journal of Wuhan University of Technology

基　　金：四川省教育厅重点资助项目(2006A095);四川省非金属复合与功能材料重点实验室开放基金(10zxfk05)

摘　　要：研究了改性和未改性再生骨料、硅灰及引气剂等因素对C40再生骨料混凝土抗冻性能的影响。结果表明:经300次冻融循环后,与天然骨料混凝土相比,随着再生骨料取代率的增加,再生混凝土的抗冻性有所下降;改性骨料能在一定程度上改善混凝土的抗冻性,有机硅防水剂改性后的再生骨料效果较好;硅灰和引气剂掺加都能较明显地改善再生混凝土的抗冻性。The influence of modified and unmodified aggregate,silica fume and air-entraining agent on the frost resistance of C40 recycled aggregate concrete has been studied.The results show that the frost resistance of the recycled aggregate concrete with various replacement of recycled aggregate through 300 cycles of freezing and thawing,compared to natural aggregate concrete（control concrete）.Moreover,the frost resistance of recycled aggregate concrete falls with the increase of the replacement of recycled aggregate.The frost resistance of recycled aggregate concrete can be improved through either addition of the modified recycled aggregate by organic-silicon or an appropriate amount of silica fume or entrained air agent,and it can be attributed to the improvement of the microstructure of recycled aggregate concrete.Silica fume and air-entraining agent can obviously improve the frost resistance of recycled aggregate concrete.

关 键 词：再生骨料 混凝土 抗冻性 

分 类 号：TU528[建筑科学—建筑技术科学]