不同纤维对高强轻骨料混凝土力学性能影响及微观机理研究  

Effect of Different Fibers on Mechanical Properties of High-strength Lightweight Aggregate Concrete and Its Micro-Mechanism Research

作　　者：张伟[1] 李晓兵 王世合 张春晓 ZHANG Wei;LI Xiaobing;WANG Shihe;ZHANG Chunxiao(School of Civil Engineering and Architecture,Henan University of Science and Technology,Luoyang 471023,China;Institute of Engineering Protection,Institute of Defense Engineering,Academy of Military Sciences,Luoyang 471023,China;Henan Key Laboratory of Special Protective Materials,Luoyang 471023,China)

机构地区：[1]河南科技大学土木建筑学院,河南洛阳471023 [2]军事科学院国防工程研究院,河南洛阳471023 [3]河南省特种防护材料重点实验室,河南洛阳471023

出　　处：《河南科技大学学报（自然科学版）》2024年第2期21-29,M0003,M0004,共11页Journal of Henan University of Science And Technology:Natural Science

基　　金：国家自然科学基金项目(U21A20149)。

摘　　要：为改善高强轻骨料混凝土的力学性能和弯曲韧性,研究了玄武岩纤维、细聚乙烯醇纤维、仿钢纤维、聚丙烯纤维和粗聚乙烯醇纤维的掺入对高强轻骨料混凝土抗压强度、劈裂抗拉强度和抗弯强度的影响规律。通过4点弯曲试验获取荷载-挠度曲线,基于韧性指标对比分析了5种纤维对高强轻骨料混凝土弯曲韧性的影响。通过扫描电子显微镜观察纤维破坏前后的表面微观形貌,阐释了不同纤维的增强增韧机理。研究结果表明:掺入纤维对高强轻骨料混凝土的力学性能均有提升,主要提升高强轻骨料混凝土的抗拉性能和弯曲韧性。粗聚乙烯醇纤维提升劈裂抗拉强度和抗弯强度程度最大,分别提高了83%和220%,使高强轻骨料混凝土破坏由脆性转为高延性。纤维对高强轻骨料混凝土抗拉性能和韧性的提升与纤维表面损伤程度成正比。To improve the mechanical properties and flexural toughness of high-strength lightweight aggregate concrete,the effects of basalt fiber,fine polyvinyl alcohol fiber,imitation steel fiber,polypropylene fiber and coarse polyvinyl alcohol fiber on the compressive strength,splitting tensile strength and flexural strength of high-strength lightweight aggregate concrete were studied.The load-deflection curve was obtained by four-point bending test,and the effects of five kinds of fibers on the flexural toughness of high-strength lightweight aggregate concrete were compared and analyzed based on the toughness index.The surface morphology of the fibers before and after damage was observed by scanning electron microscopy,and the strengthening and toughening mechanisms of different fibers were explained.The results show that the incorporation of fibers improves the mechanical properties of high-strength lightweight aggregate concrete,mainly improving the tensile properties and flexural toughness of high-strength lightweight aggregate concrete.The coarse polyvinyl alcohol fiber improves the splitting tensile strength and bending strength by 83%and 220%respectively,which makes the failure of high strength lightweight aggregate concrete change from brittleness to high ductility.The improvement of fiber on the tensile properties and toughness of high strength lightweight aggregate concrete is proportional to the degree of fiber surface damage.

关 键 词：高强轻骨料混凝土 纤维 力学性能 弯曲韧性 

分 类 号：TU528.572[建筑科学—建筑技术科学]