集束型玻璃纤维混凝土轴拉、弯曲和断裂性能  

Axial tensile properties,flexural toughness and fracture properties of bundling glass-fiber reinforced concrete

作　　者：邓宗才[1] 陈海龙 DENG Zongcai;CHEN Hailong(The Key Laboratory of Urban Security and Disaster Engineering,Ministry of Education,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学城市与工程防灾减灾省部共建教育部重点实验室,北京100124

出　　处：《哈尔滨工程大学学报》2019年第5期993-999,共7页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(51578021)

摘　　要：为掌握不同掺率耐碱集束型玻璃纤维混凝土的力学韧性,本文对不同体积掺率的耐碱集束型玻璃纤维混凝土和钢纤维及粗聚烯烃纤维混凝土进行了轴拉、四点弯曲韧性和三点切口梁断裂试验。分析了纤维掺率对耐碱集束型玻璃纤维混凝土力学性能的影响规律,并和同体积掺率的钢纤维和粗聚烯烃纤维混凝土进行了比较。试验表明:耐碱集束型玻璃纤维混凝土轴拉性能优于同体积掺率的粗聚烯烃纤维混凝土,轴拉强度和极限拉应变均略高于同体积掺率的钢纤维混凝土;耐碱集束型玻璃纤维体积掺率为0. 75%时,弯曲韧性值和峰值强度比素混凝土分别提高了191. 73%和11. 47%,断裂韧度和断裂能比素混凝土分别提高了28. 16%和268. 69%,该掺率下耐碱集束型玻璃纤维混凝土弯曲韧性指标和断裂力学指标增幅较大。In order to master the mechanical troughness the alkali-resistant bundling glass-fiber reinforced concrete,the axial tensile,four-point bending toughness and three-point incision beam fracture tests were carried out,respectively,on the alkali-resistant bundling glass-fiber reinforced concrete. The steel fiber concrete and the crude polyolefin fiber concrete had volume fractions of 0. 45% and 0. 75%,respectively. The influence of fiber fraction on the mechanical properties of the alkali-resistant bundling glass-fiber reinforced concrete was analyzed and compared with the steel fiber concrete and crude polyolefin fiber concrete with the same volume fraction. Test results show that the axial tensile properties of the alkali-resistant bundling glass-fiber reinforced concrete is better than that of crude polyolefin fiber concrete with the same volume fraction;meanwhile,the tensile strength and ultimate tensile strain are slightly higher than that of the steel-fiber reinforced concrete with the same volume. When the alkali-resistant bundling glass fiber volume fraction is 0. 75%,the flexural toughness value and peak intensity are 191. 73% and 11. 47% higher than that of plain concrete,respectively,and the fracture toughness and fracture energy are28. 16% and 268. 69% higher than that of plain concrete,respectively. The flexural toughness and fracture mechanics index of the alkali-resistant bundling glass-fiber reinforced concrete has increased greatly with this volume fraction.

关 键 词：耐碱集束型玻璃纤维 轴拉性能 弯曲韧性 断裂性能 体积掺率 钢纤维 聚烯烃纤维 纤维混凝土 

分 类 号：TU377.9[建筑科学—结构工程]