混凝土-环氧砂浆界面Ⅰ-Ⅱ型断裂性能试验研究

杭振园; 喻莹

doi:10.13204/j.gyjzG22113007

混凝土-环氧砂浆界面Ⅰ-Ⅱ型断裂性能试验研究

doi: 10.13204/j.gyjzG22113007

杭振园^1,2,
喻莹^2, ,

1. 浙江交通职业技术学院路桥学院, 杭州 311112;
2. 汕头大学土木与环境工程系, 广东汕头 515000

基金项目:

浙江省交通运输厅计划项目(2021008)

浙江省教育厅一般科研项目(Y202250046)。

浙江省科技计划项目(LGG21E80001)

详细信息

作者简介:
杭振园,男,1987年出生,讲师,博士研究生,hzy1414@126.com。

通讯作者:
喻莹,女,1983年出生,教授,yuying@stu.edu.cn。

计量
- 文章访问数: 142
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- PDF下载量: 4
- 被引次数: 0
出版历程
- 收稿日期: 2022-11-30
- 网络出版日期: 2023-05-25
- 刊出日期: 2023-02-20

Experimental Research on Fracture Properties of Mixed Mode Ⅰ-Ⅱ Concrete-Epoxy Mortar Interface

HANG Zhenyuan^1,2,
YU Ying^{2
, ,}

1. College of Road & Bridge, Zhejiang Institute of Communication, Hangzhou 311112, China;
2. Department of Civil and Environment Engineering, Shantou University, Shantou 515000, China

摘要

摘要: 为研究混凝土强度和界面粗糙度对混凝土-环氧砂浆界面Ⅰ-Ⅱ型复合裂缝扩展和断裂性能的影响,对15个试件进行四点剪切试验,采用数字图像相关(DIC)技术获得试件表面位移场和应变场。基于线弹性断裂理论和试验测得的Ⅰ型裂缝起裂韧度,计算断裂能、变形系数和裂缝尖端Ⅰ型和Ⅱ型应力强度因子。研究结果表明:试件均沿着界面发生典型的准脆性破坏;通过提高混凝土强度可以显著增强界面的断裂性能,但对裂缝尖端处Ⅰ型和Ⅱ型应力强度因子比重的影响较小;试件断裂性能、裂缝尖端应力场和破坏角与界面粗糙度有较大的相关性,当灌砂平均深度h从0 mm增大到0.31 mm和0.97 mm时,断裂能G_u分别提高了16.1%和66.9%,变形系数N_u分别提高了5.4%和27.6%,Ⅰ型、Ⅱ型应力强度因子比值分别下降了11.96%和39.7%,破坏角分别增大了11.9%和37.8%。
- 混凝土 /
- 环氧砂浆 /
- 粗糙度 /
- 断裂性能 /
- 应力强度因子
Abstract: In order to analyze the effects of concrete strength and interface roughness on the crack propagation and fracture properties of mixed mode Ⅰ-Ⅱ concrete-epoxy mortar interface, four-point shear tests were conducted on 15 specimens, and the displacement and strain fields of the specimens were obtained by digital image correlation (DIC) technology. The fracture energy, ductility index and the stress intensity factors of mode Ⅰ and mode Ⅱ at the crack tip were calculated based on the linear-elastic fracture mechanics theory and fracture initiation toughness of mode Ⅰ measured by tests. The test results showed that the crack propagated along the interface, which belonged typical quasi-brittle failure. The fracture performance of the interface could be significantly enhanced through increasing the concrete strength, however, there was little effect of the concrete strength on the ratio of the stress intensity factors of mode Ⅰ and mode Ⅱ. The fracture performance, stress field at the crack tip, and failure angle of the specimen was relevant to the interface roughness. As increased from 0 mm to 0.31 mm, 0.97 mm, fracture energy G_u increased by 16.1% and 66.9%, ductility index G_u increased by 5.4% and 27.6% respectively, the ratio of the stress intensity factors of mode Ⅰ and mode Ⅱ decreased by 11.96% and 39.7%, and the failure angle increased by 11.9% and 37.8%, respectively.
- concrete /
- epoxy mortar /
- roughness /
- fracture performance /
- stress intensity factors

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