粗陶砂对超高性能混凝土的性能及微观结构的影响  

Effect of coarse pottery sand on the performance and microstructure of ultra-high performance concrete

作　　者：蒋春园 姚丕强[4] 黄雄 余睿 孙美娟 范定强 水中和 JIANG Chunyuan;YAO Piqiang;HUANG Xiong;YU Rui;SUN Meijuan;FAN Dingqiang;SHUI Zhonghe(State Key Laboratory of Silicate Materials for Architectures,Wuhan 430070,China;School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China;Wuhan University of Technology Advanced Engineering Technology Research Institute of Zhongshan City,Zhongshan 528400,China;Tianjin Cement Industry Design and Research Institute Co.,Ltd.,Tianjin 300000,China)

机构地区：[1]硅酸盐建筑材料国家重点实验室,湖北武汉430070 [2]武汉理工大学材料科学与工程学院,湖北武汉430070 [3]中山市武汉理工大学先进工程技术研究院,广东中山528400 [4]天津水泥工业设计研究院有限公司,天津300000

出　　处：《混凝土》2023年第7期21-23,27,共4页Concrete

基　　金：国家自然科学基金(52178249)。

摘　　要：基于颗粒最紧密堆积理论,通过MAA模型对陶砂骨料的最大粒径分别为0.6、2.36、4.75 mm的UHPC进行了配合比设计,并对其新拌混凝土的工作性能、硬化混凝土的力学性能、体积稳定性和微观结构进行了评价。结果表明:通过MAA得到的陶砂UHPC具有较低的收缩值和优异的界面微观结构,其28 d的抗压强度均在110 MPa以上,陶砂组最大的收缩值仅为300×10^(-6),较河砂组的最大值770×10^(-6)降低了50%以上。Based on the theory of the tightest packing of particles,the UHPC with the maximum particle size of the ceramic sand aggregates of 0.6 mm,2.36 mm and 4.75 mm was designed through the MAA model.And the working performance of their fresh concrete,the mechanical properties,volume stability and microstructure of hardened concrete were evaluated.The results show that UHPC made by MAA has low shrinkage value and excellent interface microstructure.Its 28 d compressive strength is above 110 MPa,and the maximum shrinkage value of the ceramic sand group is only 300×10^(-6),which is more than 50%lower than the maximum value of 770×10^(-6)of the river sand group.

关 键 词：陶砂超高性能混凝土 自收缩 性能 微观结构 

分 类 号：TU528.01[建筑科学—建筑技术科学]