超细粉煤灰对水泥性能的影响及在混凝土中的应用研究  

Study on the effect of ultra-fine fly ash on cement performance and its application in concrete

作　　者：范梦甜 王迎斌 苏英[1,2] 李佳伟 肖虎成[1] 贺行洋 FAN Mengtian;WANG Yingbin;SU Ying;LI Jiawei;XIAO Hucheng;HE Xingyang(School of Civil Engineering and Environmental Sciences,Hubei University of Technology,Wuhan 430068,China;Building Waterproof Engineering and Technology Research Center of Hubei Province,Hubei University of Technology,Wuhan 430068,China)

机构地区：[1]湖北工业大学土木建筑与环境学院,湖北武汉430068 [2]湖北工业大学湖北省建筑防水工程技术研究中心,湖北武汉430068

出　　处：《新型建筑材料》2021年第8期16-20,37,共6页New Building Materials

基　　金：“十三五”国家重点研发计划项目(2019YFC1907104);国家自然科学基金项目(52008158)。

摘　　要：研究了超细粉煤灰的粒径分布和颗粒形态,以及粉煤灰-水泥复合胶凝材料的力学性能及微观结构,并对超细粉煤灰在混凝土中的实际应用进行了研究。结果表明,超细化处置20、40、60 min后的粉煤灰中值粒径分别可降至8.2、4.5、2.4μm。掺入超细粉煤灰的水泥复合胶凝材料强度明显提高,PCFA4的28 d抗压强度为68.5 MPa,与纯水泥抗压强度相同;掺加超细粉煤灰可降低硬化浆体的孔隙率和中值孔径;随粉煤灰粒径的减小,Ca(OH)2含量从16.53%下降至10.28%;掺加超细粉煤灰的混凝土60 d抗压强度与空白混凝土相差不大。The particle size distribution and particle morphology of ultrafine fly ash,as well as the mechanical properties and microstructure of fly ash-cement composite cementitious material were studied.The practical application of ultrafine fly ash in concrete was studied.The results show that the median particle size of fly ash can be reduced to 8.2μm,4.5μm and 2.4μm after ultrafine treatment for 20 min,40 min and 60 min.The strength of cement composite cementitious material mixed with ultrafine fly ash is obviously improved.The 28 d compressive strength of PCFA4 is 68.5 MPa,which is the same as that of pure cement.The addition of ultrafine fly ash can reduce the porosity and the median pore size of hardened slurry.The content of Ca(OH)2 in PCFA samples decreased from 16.53%to 10.28%with the decrease of the fly ash particle size.The 60 d compressive strength of the concrete samples with ultra-fine fly ash is close to that of blank concrete.

关 键 词：粉煤灰 超细化 力学性能 微观结构 混凝土 

分 类 号：TU528.041[建筑科学—建筑技术科学]