煅烧纳米凹凸棒土对再生混凝土性能的影响  

Effect of Nano Attapulgite on Properties of Recycled Aggregate Concrete

作　　者：阎杰 于旭涛 刘兴隆 翁维素 太飞 谢军 YAN Jie;YU Xu-tao;LIU Xing-long;WENG Wei-su;TAI Fei;XIE Jun(College of Civil Engineering,Hebei University of Architecture,Zhangjiakou 075000,China;Hebei University Green Building Materials and Building Transformation Application Technology Research and Development Center,Zhangjiakou 075000,China;Hangxiao Steel Construction(Guangdong)Co.,Ltd.,Zhuhai 519000,China)

机构地区：[1]河北建筑工程学院土木工程学院,张家口075000 [2]河北省高校绿色建材与建筑改造应用技术研发中心,张家口075000 [3]杭萧钢构(广东)有限公司,珠海519000

出　　处：《科学技术与工程》2023年第23期10059-10066,共8页Science Technology and Engineering

基　　金：河北省科技厅科技支撑计划(20373802D);河北省教育厅自然科学重点项目(ZD2022066);2022年河北省建设科技研究指导性计划项目(2022-2107)。

摘　　要：为促进废弃混凝土资源的再生利用,采用煅烧纳米凹凸棒土(nanometer attapulgite,NAT)改善再生混凝土性能,研究了再生骨料取代率和煅烧NAT掺量对再生混凝土工作性能、抗压强度及抗氯离子侵蚀性能的影响,并结合X-射线衍射分析煅烧NAT的物相变化,扫描电镜和孔径分析仪分析再生混凝土的微观结构。试验结果表明:煅烧可以提高NAT火山灰效应。再生混凝土各龄期抗压性能和抗氯离子侵蚀性能均随再生骨料取代率的增加而降低;未掺煅烧NAT时,再生混凝土中有较多孔隙和裂缝;当掺入适量煅烧NAT后,混凝土内孔隙和裂缝减少,界面过渡区更加密实。就工作性能、抗压强度、抗氯离子侵蚀性能和微观结构而言,当再生骨料取代率为30%时,煅烧NAT的最佳掺量为6%。To promote the regeneration of waste concrete resources,calcined attapulgite(NAT)was used to improve the properties of recycled concrete.The effects of recycled aggregate replacement ratio and calcined NAT content on the workability,compressive strength,and resistance to chloride ion penetration of recycled concrete were investigated and combined with X-ray diffraction to analyze the phase transition of calcined NAT,scanning electron microscope and pore size analyzer to analyze the microstructure of recycled con-crete.The test results show that calcination can improve the NAT volcanic ash effect.The increased recycled aggregate substitution rate decreased the compressive properties and resistance to chloride ion penetration of recycled concrete at all ages.When calcined NAT is not incorporated,there are more pores and cracks in the recycled concrete.When the appropriate amount of calcined NAT is incorpo-rated,the pores and cracks in the concrete are reduced,and the interface transition zone is more compacted.Regarding workability,compressive strength,resistance to chloride ion attack,and microstructure,the optimum amount of calcined NAT is 6%when the recy-cled aggregate substitution rate was 30%.

关 键 词：抗氯离子侵蚀性能 抗压强度 再生混凝土 煅烧纳米凹凸棒土 再生骨料 

分 类 号：TU528[建筑科学—建筑技术科学]