Yan Dong, Lai Lipeng, Xiao Xuedang, Zhang Lei, Zhao Zilong, Zhao Jun
College of Architecture and Civil Engineering, Xinyang Normal University, Xinyang 464000, China.
Xinyang Lingshi Technology Co., Ltd., Xinyang 464000, China.
Gels. 2023 Sep 19;9(9):764. doi: 10.3390/gels9090764.
Acrylic materials exhibit favorable grouting repair performance. However, their curing products are easily inclined to drying shrinkage, and their concrete impermeability repair characteristics have seldom been investigated. To improve material properties, reveal the impermeability repair mechanism, and address drying shrinkage, this study proposed the addition of styrene-acrylate copolymer emulsion (styrene-acrylic emulsion) to the grouting material to prepare two-component acrylate grouting materials. Using orthogonal and single-factor tests combined with physical and mechanical properties, the mechanical properties and impermeability repair performance (physical and mechanical properties combined) of grouting materials were analyzed and studied, and the optimal ratio of each component of acrylate grouting materials was determined. Results show that (1) the hydrogel produced by the reaction of sodium methacrylate with hydroxyethyl acrylate has good physical and mechanical properties. (2) With the increase in the accelerator dosage, the setting time of slurry initially decreases and then increases; as the initiator dosage increases, the setting time of slurry decreases, which is negatively correlated with the initiator dosage. (3) Talcum powder can improve the physical and chemical properties of gel and enhance the reliability and durability of acrylate grouting materials, and the comprehensive performance is the best at a dosage of 3%. (4) Styrene-acrylic emulsion can increase the solid content and reduce the volume drying shrinkage when added to grouting materials. The fractured impermeable specimens were repaired by grouting with prepared acrylate grouting materials and cured for 24 h for the impermeability test, and the water pressure for the 24 h impermeability repair was 1.0 MPa. This study's results provide important reference and basis for revealing the impermeability principle of acrylate grouting materials and evaluating their impermeability.
丙烯酸材料具有良好的灌浆修复性能。然而，其固化产物容易出现干燥收缩，且其对混凝土抗渗性的修复特性鲜有研究。为改善材料性能、揭示抗渗修复机理并解决干燥收缩问题，本研究提出在灌浆材料中添加苯乙烯 - 丙烯酸酯共聚物乳液（苯丙乳液）来制备双组分丙烯酸酯灌浆材料。通过正交试验和单因素试验并结合物理力学性能，对灌浆材料的力学性能和抗渗修复性能（物理性能与力学性能相结合）进行了分析研究，确定了丙烯酸酯灌浆材料各组分的最佳配比。结果表明：（1）甲基丙烯酸钠与丙烯酸羟乙酯反应生成的水凝胶具有良好的物理力学性能。（2）随着促进剂用量的增加，浆液的凝结时间先减小后增大；随着引发剂用量的增加，浆液的凝结时间减小，且与引发剂用量呈负相关。（3）滑石粉可改善凝胶的物理化学性能，提高丙烯酸酯灌浆材料的可靠性和耐久性，用量为3%时综合性能最佳。（4）苯丙乳液添加到灌浆材料中可增加固体含量并降低体积干燥收缩。用制备的丙烯酸酯灌浆材料对破裂的抗渗试件进行灌浆修复，并养护24 h后进行抗渗试验，24 h抗渗修复的水压为1.0 MPa。本研究结果为揭示丙烯酸酯灌浆材料的抗渗原理及评价其抗渗性提供了重要参考和依据。
