Experimental study on mechanical properties of polypropylene fiber ceramsite concrete
SHI Yangguang^1,2, LIU Lei¹, CHEN Guoxin²
1. Xinjiang Laboratory of Phase Transitions and Microstructures in Condensed Matters, College of Physical Science and Technology, Yili Normal University, Yining 835000, China;
2. College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi 830052, China
Abstract: In order to study the effects of water-cement ratio, sand rate and polypropylene fiber content on the mechanical properties of ceramic concrete, the orthogonal experimental design method was used to carry out experimental research on the normal temperature compressive strength, low temperature compressive strength and splitting tensile strength of ceramic concrete, and the range and variance analysis were carried out. The evolution of fiber toughening mechanism and low-temperature compressive strength was revealed from failure morphology, load-displacement relationship and mesoscale. The prediction model of normal temperature compressive strength and splitting tensile strength was established. The results show that the fiber changes the failure form of light aggregate concrete and delays the development of cracks. The displacement load-load curve decreased slowly after fiber was added；The sand rate has a significant effect on compressive strength, and the water-cement ratio and sand rate are significant factors affecting the tensile strength of splitting. The compressive strength at low temperature increased by 1.6%-21.9% compared with the compressive strength at room temperature. The prediction model of compressive strength and splitting tensile strength established has high accuracy.
Keywords: polypropylene fiber ceramsite concrete;microstructure;compressive strength;splitting tensile strength;strength prediction model
2023, 49(9):167-173  收稿日期: 2022-05-19;收到修改稿日期: 2022-08-23
基金项目: 新疆维吾尔自治区自然科学基金资助项目（2022D01C339）；伊犁师范大学科研项目（2017YSYY18）；新疆维吾尔自治区高校科研计划项目（XJEDU2022P095）
作者简介: 史阳光（1990-），男，河南周口市人，讲师，博士，研究方向为新型建筑材料
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