单组分聚氨酯泡沫胶粘剂对混凝土裂缝的修复性能研究  

Study on the Performance of One component Polyurethane Foam Adhesive for Repairing Concrete Cracks

作　　者：黄云波 干林伟 陈海发 罗庆章 HUANG Yunbo;GAN Linwei;CHEN Haifa;LUO Qingzhang(China Construction Seventh Engineering Division Co.,Ltd.,Zhengzhou 450004,China)

机构地区：[1]中国建筑第七工程局有限公司,河南郑州450004

出　　处：《化学与粘合》2023年第6期530-533,552,共5页Chemistry and Adhesion

摘　　要：混凝土结构工程难以避免裂缝的存在,若不及时修复,任其发展到一定程度,会导致工程结构承载力大大降低,影响整个工程的稳定性和安全性。面对这种情况,实施单组分聚氨酯泡沫胶粘剂对混凝土裂缝的修复性能研究。制备单组分聚氨酯泡沫胶粘剂,制作3种不同强度的带有裂缝的混凝土试件。利用前者修复后者试件的裂缝并检测修复后的裂缝愈合率和渗水系数,判断胶粘剂的修复性能。结果表明:冬季时,单组分聚氨酯泡沫胶粘剂修复后,三个试件的裂缝愈合率均大于98%、渗水系数均小于0.2;夏季时,试件1的修复效果最好,其次是试件3、最后是试件2;冬季时,试件2的修复效果最好,其次是试件1、最后是试件3。无论是夏季,还是冬季时,修复均达到合格标准,证明了修复效果。It is difficult to avoid the existence of cracks in concrete structure engineering.If it is not repaired in time and allowed to develop to a certain extent,the bearing capacity of the engineering structure will be greatly reduced,affecting the stability and safety of entire project.In the face of this situation,the performance of one component polyurethane foam adhesive for repairing concrete cracks is studied.One component polyurethane foam adhesive is prepared,and three concrete specimens with cracks of different strengths are made.The former is used to repair the cracks of the latter specimen,and the crack healing rate and water permeability coefficient after repair are detected to judge the repair performance of adhesive.The results show that the crack healing rate of the three specimens is greater than 98%and the water permeability coefficient is less than 0.2 after being repaired by the one component polyurethane foam adhesive in winter.Whether in summer or winter,the repair reaches the qualified standard,which proves the repair effect.In summer,the repair effect of specimen 1 is the best,followed by specimen 3 and specimen 2.In winter,the repair effect of specimen 2 is the best,followed by specimen 1 and specimen 3.

关 键 词：单组分聚氨酯泡沫胶粘剂 混凝土裂缝 裂缝愈合率 渗水系数 修复性能 

分 类 号：TU583[建筑科学—建筑技术科学]