塑钢纤维、改性橡胶对混凝土性能影响试验分析

摘要

采用正交试验, 研究塑钢纤维掺量、橡胶颗粒掺量、橡胶颗粒改性方式对混凝土力学特性的影响, 基于极差与方差分析结果, 分析影响抗压强度、抗折强度、劈裂抗拉强度的主要因素, 并得出塑钢纤维改性橡胶混凝土最佳配比.结果表明, 橡胶颗粒经改性后, 其表面的亲水性和粗糙度增加, 与混凝土黏结性提高, 有效降低结构孔隙率;该型号混凝土其最佳配比为塑钢纤维掺量6 kg/m3, 经CH3 COCH3溶液改性处理的橡胶颗粒掺量14.15 L/m3, 其抗压强度和抗折强度增量分别为3.8％～6.7％和10.2％～19.4％, 并且其抑制冻胀损伤的能力和抗渗透性增强, 抗冻标号可达F225, 混凝土的脆性和抗裂性得到明显改善.%The effects of plastic steel fiber content, rubber particle content and rubber particle modification on mechanical properties of concrete were studied by orthogonal test. Based on the results of range and variance analysis, the main factors affecting compressive strength, flexural strength and tensile strength of split were analyzed, and the optimum ratio of plastic-steel fiber modified rubber concrete was obtained. The results showed that the surface hydrophilicity and roughness of rubber particles increased after modification, and the adhesion of concrete and compactness increased. The optimal ratio of plastic-steel fiber modified rubber concrete is 6 kg/m3 of plastic-steel fiber, and 14.15 L/m3 of rubber particles modified by CH3 COCH3 solution. The increment of compressive strength was between 3.8％ and 6.7％ and flexural strength was 10.2％ and 19.4％. The ability of concrete restraining frost heave damage and permeability were enhanced and its antifreezing property can reach F225. The brittleness and crack resistance of concrete were improved obviously.