道路基层复合胶凝材料的性能调控  

Performance Regulation of Road Base Composite Binder

作　　者：赵德强 张昺榴 朱文尚[1] 陈端欣 沈卫国[1,2,3] ZHAO Deqiang;ZHANG Bingliu;ZHU Wenshang;CHEN Duanxin;SHEN Weiguo(School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China;State Key Laboratory of Silicate Materials for Architecture, Wuhan University of Technology, Wuhan 430070, China;WUT-UC Berkeley Joint Laboratory on Concrete Science and Technology, Wuhan 430070, China)

机构地区：[1]武汉理工大学材料科学与工程学院,湖北武汉430070 [2]武汉理工大学硅酸盐建筑材料国家重点实验室,湖北武汉430070 [3]武汉理工加州大学伯克利混凝土科学与技术联合实验室,湖北武汉430070

出　　处：《建筑材料学报》2020年第5期1137-1143,共7页Journal of Building Materials

基　　金：“十三五”国家重点研发计划项目(2016YFB0303603);事业委托项目(20171h0256)。

摘　　要：研究了熟料钢渣粉煤灰磷石膏系道路基层复合胶凝材料的凝结时间、胶砂强度和膨胀性能的调控,分析了其缓凝微膨胀机理.结果表明:磷石膏中的可溶性杂质会与Ca2+和OH-反应,生成难溶物覆盖在胶凝材料颗粒表面,显著延长凝结时间,磷石膏掺量每增加3%,即可延长凝结时间约65min;大掺量磷石膏可为浆体提供充足的SO4^2-,保证钙矾石的大量稳定生成,使硬化浆体产生微膨胀;过量磷石膏亦会造成过大的膨胀,破坏硬化浆体结构,通过加入适量钢渣取代粉煤灰,可以促进复合胶凝材料的早期水化,优化孔结构,明显提高道路基层复合胶凝材料的性能.The setting time,strength and expansion properties of clinker-steel slag-fly ash-phosphogypsum series road base composite binder were studied.The results show that the soluble impurities in phosphogypsum can react with Ca2+and OH-to form insoluble substances covering the surface of binder particles,which significantly extends the setting time,the setting time can be prolonged about 65min with a 3%increase in the content of phosphogypsum.At the same time,large amount of phosphogypsum can provide sufficient SO4^2- ions for the slurry to ensure the large amount of stable formation of ettringite,and makes the hardened slurry slightly expand.However,excessive amount of phosphogypsum will also cause excessive expansion and leads to structural damage.The early hydration of composite binder and the optimization of pore structure can be promoted by adding appropriate amount of steel slag instead of fly ash,and the performance of road base composite binder can be significantly improved.

关 键 词：道路基层 磷石膏 钢渣 性能调控 胶凝材料 

分 类 号：TU525.09[建筑科学—建筑技术科学]