- 摘 要
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(1 湖南科技大學土木工程學院， 湘潭 411201； 2 湘潭市建筑設計院， 湘潭 411100；3 江西省標正技術(shù)工程有限公司， 南昌 330077)
［摘要］通過對2根經(jīng)環(huán)氧注漿裂縫修補后的鋼筋混凝土梁進行由下向上兩點加載試驗，研究對比修補前后裂縫開展寬度、位置及荷載撓度曲線等的變化規(guī)律。結(jié)果表明，環(huán)氧樹脂因良好的滲透性，不僅使經(jīng)環(huán)氧樹脂修補后的裂縫及周邊混凝土得到有效加強，實現(xiàn)了“被粘物破壞”機制；而且可顯著提高鋼筋混凝土梁的初裂荷載，增強其抗彎剛度和抗裂性，對受力裂縫有著良好的修補效果。同時，基于現(xiàn)場注漿實際操作時間，引入折減系數(shù)，提出了修正后的計算注漿擴散半徑公式。
［關鍵詞］受彎構(gòu)件； 環(huán)氧注漿料； 裂縫； 修補； 擴散半徑
中圖分類號：TU375 文獻標識碼：A文章編號：1002-848X(2021)11-0136-05
Research on mechanical properties of bending members after repairing cracks by epoxy grouting
YIN Guolin1, Lv Weirong1, LU Beirong1, ZHAO Sitai1, ZHOU Zhijin2, ZHONG Xiaojin3
(1 Department of Civil Engineering, Hunan University of Science and Technology， Xiangtan 411201， China; 2 Xiangtan Building Design Institute, Xiangtan 411100， China; 3 Jiangxi Standard Technology Engineering Co., Ltd., Nanchang 330077, China)
Abstract: Two reinforced concrete beams repaired by epoxy grouting were tested by two-point loading from bottom to top, and the variation of crack width, position and load deflection curve before and after repair were studied. The results show that the epoxy resin can effectively strengthen the cracks and surrounding concrete repaired by epoxy resin because of its good permeability, and realize the mechanism of "adhesion failure"; moreover, it can significantly improve the initial crack load of reinforced concrete beam, enhance its bending stiffness and crack resistance, and has a good repair effect on stress cracks. At the same time, based on the actual operation time of field grouting, the modified formula for calculating grouting diffusion radius was proposed by introducing reduction coefficient.
Keywords:bending member； epoxy grouting material； crack； repair； diffusion radius
*國家自然科學基金面上項目（51578235, 51678234），湖南省自然科學基金項目面上項目（2018JJ2129）。
作者簡介：尹國林，碩士，助理工程師，Email:1787327775@qq.com；通信作者：呂偉榮，博士 ，教授，Email: lwrxm@126.com。
