| 摘要: |
| 为了改善水泥基弹性灌浆材料在深水环境条件下的使用性能，研究了丙烯酸酯乳液和水性胶乳固化剂对水泥基弹性灌浆材料性能的影响，并对水泥基胶凝材料的配比进行优化。试验结果表明，在丙烯酸酯胶乳中加入水性胶乳固化剂并掺入灌浆料后，一部分丙烯酸酯与水性固化剂中的酰胺基在水泥水化形成的碱性条件下发生迈克尔加成反应和酰胺化反应生成聚丙烯酰胺系列化合物，提高了灌浆料水下不分散性，固结体水气强度比在90%以上；同时，水性胶乳固化剂促进了另一部分丙烯酸酯共聚胶乳固化成膜，弹性灌浆料与混凝土裂缝界面水下粘结抗折强度大于2.0 MPa，抗渗承载压强大于1.2 MPa。灌浆料中掺加适量橡胶细粉并优化配伍可有效降低固结体弹性模量，提高抗冲击韧性和弹性变形能力，灌浆料固结体体积稳定，无干缩开裂隐患。 |
| 关键词: 弹性灌浆料 裂缝修补 水下粘结 抗渗承载压强 水性胶乳固化剂 |
| DOI：10.12170/201902001 |
| 分类号:TU528.0 |
| 基金项目:国家重点研发计划资助项目（2016YFC0401609） |
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| Effects of waterborne latex curing agent on performance of elastic |
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CHEN Xunjie, OUYANG Youling, WEI Hua
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Research Center on New Materials in Hydraulic Structures of Ministry of Water Resources, Nanjing Hydraulic Research Institute, Nanjing
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| Abstract: |
| In order to improve the performance of the elastic cement-based grouting materials in deep water environment, experimental studies of the effects of acrylate latex and waterborne latex curing agent on the performance of the elastic cement-based grouting materials are carried out in this research. And the mix promotion of the cement-based cementitious materials is optimized. The testing results show that after admixing waterborne latex curing agent into the grouting materials mixed with the acrylate latex, some acrylate can react with the amido of waterborne latex curing agent by Michael addition and amidation to form polyacrylamide compounds under alkaline conditions of cement hydration, which improves the non-dispersibility of grouting material under water, and the water-air strength ratio of the concretions is more than 90%. At the same time, other acrylate latex is accelerated to form film by waterborne latex curing agent. The interfacial flexural strength between the elastic grouting material and concrete crack interface is greater than 2.0 MPa, and the bearing permeability pressure is greater than 1.2 MPa. Admixing a defined amount of rubber powder into the grouting material can effectively reduce elasticity modulus, improve impact toughness and elastic deformation capacity. The concretion of grouting material has the characteristics of volume stability with no dry shrinkage cracking. |
| Key words: elastic grouting material crack repair underwater bonding performance bearing permeability pressure waterborne latex curing agent |
