作者：史阳光1,2, 刘磊1, 陈国新2
作者单位：1. 伊犁师范大学物理科学与技术学院 新疆凝聚态相变与微观结构实验室, 新疆 伊宁 835000;
2. 新疆农业大学水利与土木工程学院, 新疆 乌鲁木齐 830052
关键词：聚丙烯纤维混凝土;细观分析;抗压强度;劈拉强度;强度预测模型
摘要：
为研究水灰比、砂率、聚丙烯纤维掺量对陶粒混凝土力学性能的影响，采用正交实验设计方法，开展陶粒混凝土常温抗压强度、低温抗压强度、劈裂抗拉强度的试验研究并进行极差和方差分析；从破坏形态、荷载-位移关系、细观尺度揭示纤维增韧机理和低温抗压强度的演变规律；建立常温抗压强度、劈裂抗拉强度预测模型。结果表明：纤维可改变轻骨料混凝土的破坏形态，延缓裂缝的发展；掺加纤维后位移荷-载曲线下降较为缓慢；砂率对抗压强度影响显著，水灰比、砂率是影响劈裂抗拉强度的显著性因素；低温抗压强度较常温抗压强度增长1.6%~21.9%；建立的抗压强度、劈裂抗拉强度的预测模型精度高。
Experimental study on mechanical properties of polypropylene fiber ceramsite concrete
SHI Yangguang1,2, 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
参考文献
[1] 庞建勇, 徐道富. 聚丙烯纤维混凝土喷层支护技术及其在顾桥矿区的应用[J]. 岩石力学与工程学报, 2007, 184(5): 1073-1077
[2] 李永松, 李建峰, 刘颖, 等. 聚丙烯腈纤维混凝土在西部高寒地区水利工程中的应用研究[J]. 水力发电, 2018, 44(11): 121-124
[3] 郝绍菊, 马竞. 混杂纤维协同增强轻骨料混凝土力学性能试验研究[J]. 中国测试, 2022, 48(6): 128-133
[4] 杨春景, 孙红霞, 朱鹏宇. 硫酸盐侵蚀玄武岩纤维轻骨料混凝土力学性能研究[J]. 中国测试, 2021, 47(6): 68-74
[5] 权长青, 焦楚杰, 杨云英, 等. 混凝土力学性能的正交实验研究[J]. 建筑材料学报, 2019, 22(3): 363-370
[6] 杨圣飞, 李海艳, 向杰. 玄武岩纤维粉煤灰增强陶粒混凝土力学性能试验研究[J]. 中国测试, 2022, 48(4): 166-172
[7] SEENI B S, MURGAN M. Effect of aggregate size on properties of polypropylene and glass fibre-reinforced pervious concrete[J]. International Journal of Pavement Engineering, 2020, 53: 137-152
[8] 陈守开, 卢 鹏, 李炳林, 等. 不同纤维对再生骨料透水混凝土性能的影响与评价[J]. 应用基础与工程科学学报, 2022, 30(1): 208-218
[9] 梁宁慧, 任联玺, 周侃, 等. 聚丙烯粗纤维对泵送混凝土性能的影响及灰色关联分析[J]. 硅酸盐通报, 2022, 41(1): 88-99
[10] 张秉宗, 贡力, 杜强业. 西北盐渍干寒地区聚丙烯纤维混凝土耐久性损伤试验研究[J]. 材料导报, 2022, 36(17): 108-114
[11] 李兵, 张刚, 林煜期, 等. 聚丙烯纤维混凝土高温后单轴受压应力应变全曲线[J]. 材料科学与工程学报, 2022, 40(4): 608-614
[12] 时旭东, 韩大全, 崔一丹. 不同低温工况下混凝土的受压强度研究[J]. 混凝土与水泥制品, 2023, 321(1): 1-4+10
[13] 傅强, 赵旭, 何嘉琦, 等. 基于能量转化原理的混杂纤维混凝土本构行为[J]. 硅酸盐学报, 2021, 49(8): 1670-1682
[14] NGUYEN H, CARVELLI V, ADESANYA E, et al. High performance cementitious composite from alkali-activated ladle slag reinforced with polypropylene fibers[J]. Cement and Concrete Composites, 2018, 90(6): 150-160
[15] CHATTERJI S. Freezing of aqueous solutions in a porous medium Part I. Freezing of air-entraining agent solutions[J]. Cement and Concrete Research, 1985, 15(1): 13-20
