黄河涵闸加固中丙乳砂浆抗裂性能研究及应用  

Study on the Anti⁃Cracking Properties of Modified Acrylic⁃Emulsion Cement Mortar and Its Application in Yellow River Sluice Reinforcement

作　　者：段淑倩 曹备 史立明 张甲 李儒 DUAN Shuqian;CAO Bei;SHI Liming;ZHANG Jia;LI Ru(School of Civil Engineering,Zhengzhou University,Zhengzhou 450001,China;Henan Urban Planning Institute and Corporation,Zhengzhou 450044,China;Shaanxi Public Resources Trading Center,Xi’an 710000,China;Shenxian Yellow River Bureau,Liaocheng Yellow River Bureau,Shenxian 252400,China;Liaocheng Antai Yellow River Hydropower Engineering Maintenance Co.,Ltd.,Liaocheng 252000,China)

机构地区：[1]郑州大学土木工程学院,河南郑州450001 [2]河南省城乡规划设计研究总院有限公司,河南郑州450044 [3]陕西省公共资源交易中心,陕西西安710000 [4]聊城黄河河务局莘县黄河河务局,山东莘县252400 [5]聊城市安泰黄河水利工程维修养护有限公司,山东聊城252000

出　　处：《人民黄河》2022年第5期147-151,共5页Yellow River

基　　金：国家自然科学青年基金资助项目(51909241);中国博士后科学基金面上基金资助项目(2021M701111)。

摘　　要：针对黄河涵闸除险加固中丙乳砂浆护面干缩开裂问题,以金堤河干流治理工程(山东段)东池闸加固工程为依托,研究配合比和施工养护条件(养护温度、湿度和时间)对其抗裂性能的影响规律。结果表明:丙乳掺量的增大和水灰比的减小可显著改善丙乳砂浆的抗裂性能,表现为抗折强度、黏结强度提高和压折比减小,聚灰比和水灰比分别为14%和31%的丙乳砂浆可适用于东池闸护面除险加固;养护湿度和养护温度的提高均对丙乳砂浆抗干裂性能改善显著,而初始养护时间影响不明显;不同养护条件下丙乳砂浆干缩率皆在0~14 d龄期内增长迅速,在28 d时基本达到稳定。基于试验结果改进了护面的施工顺序、工艺和养护参数范围,使丙乳砂浆护面龟裂问题得到了有效解决,并取得良好的社会和经济效益,为今后涵闸丙乳砂浆护面施工提供参考数据和借鉴。Focusing on the shrinkage and cracking problem of the acrylic⁃emulsion mortar revetment in the Yellow River sluice reinforcement,the influence of mix proportion and construction curing conditions(i.e.curing temperature,humidity and time)on the anticracking property,had been well revealed.The results show that the increase of the amount of acrylic⁃emulsion and the reduction of water⁃cement ratio can significantly improve the crack resistance,exhibiting the increase in flexural strength and cohesive strength,as well as the decline of compression flexure ratio.Mortar with the polymer⁃to⁃cement weight ratio of 14%and water⁃cement ratio of 31%,can be better applied to Dongchi sluice reinforcement.The increase in curing humidity and curing temperature can have a significant improvement in the antidrying performance of the acrylic⁃emulsion mortar,but the initial curing time is not the case.The shrinkage rates of acrylic⁃emulsion mortar all increase rapidly from 0 d to 14 d,and then stabilize at 28 d under different curing conditions.The construction sequence,method and curing parameter ranges of acrylic⁃emulsion mortar are improved,with the cracking phenomenon effectively resolved,which can provide good reference for the similar Yellow River sluice reinforcement engineering.

关 键 词：丙乳砂浆 黄河涵闸 抗裂性能 加固 护面 养护条件 施工工艺 

分 类 号：TU528[建筑科学—建筑技术科学]