陶砂和钢纤维对轻质超高性能混凝土的影响  

Influence of pottery sand and steel fiber on lightweight ultra high performance concrete

作　　者：丁庆军[1] 郭凯正 程华强 雷宇翔 周昌盛 DING Qingjun;GUO Kaizheng;CHENG Huaqiang;LEI Yuxiang;ZHOU Changsheng(State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China;Wuhua Municipal Construction Group Co.,Ltd.,Wuhan 430070 China)

机构地区：[1]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 [2]武汉市政建设集团有限公司,湖北武汉430070

出　　处：《混凝土》2023年第4期59-63,共5页Concrete

基　　金：国家自然科学基金(U21A20149)。

摘　　要：为利用陶砂与钢纤维做骨架制备出轻自重与超高强度协同设计的轻质超高性能混凝土(LUHPC),研究了不同掺量与粒径的陶砂、不同掺量与长度的钢纤维对LUHPC工作性能、力学性能和收缩性能的影响规律,并通过SEM对其微结构进行分析。试验结果表明,增加陶砂的掺量可以有效减少LUHPC的表观密度,但力学性能也会随之下降;钢纤维掺量的增加显著提高了LUHPC的力学性能,且抗折强度的提升效果最为明显,在体积掺量为2%的情况下,增加钢纤维长度会导致LUHPC的工作性能降低、抗折强度提升;采用粒径为0.075~4.75 mm连续级配的陶砂和长度为13 mm的钢纤维制备的LUHPC综合性能最佳。For the use of ceramic sand skeleton was prepared with steel fiber light weight and high strength of collaborative design of lightweight high performance concrete(LUHPC),to study the different content and particle size of ceramic sand,dosage and length of steel fiber on LUHPC working properties,mechanical properties and the influence law of shrinkage performance,and through the SEM analysis of the microstructure.The experimental results show that the apparent density of LUHPC can be effectively reduced by increasing the content of ceramsite sand,but the mechanical properties will also decrease.The mechanical properties of LUHPC were significantly improved with the increase of steel fiber content,and the flexural strength of LUHPC was the most obvious.When the volume content was 2%,the working performance of LUHPC was decreased and the flexural strength was increased with the increase of steel fiber length.LUHPC prepared by continuous gradation of ceramsite sand with particle size ranging from 0.075 mm to 4.75 mm and steel fiber with length of 13 mm has the best comprehensive performance.

关 键 词：陶砂 钢纤维 轻质超高性能混凝凝土 力学性能 

分 类 号：TU528.041[建筑科学—建筑技术科学]