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选用A、B和C等3种防水材料,通过剪切试验,在不同材料类型、温度和混凝土表面状况时,对材料的抗剪强度和界面剪切系数分别进行了分析,提出了材料的抗剪性能变化规律。研究结果显示,材料不同,对温度变化的敏感性不同。结合实际路况,同时考虑温度的敏感性和不同温度时的抗剪强度值,总体评价B材料相对较好;随着温度的升高,材料与混凝土表面间的界面剪切系数逐渐降低。试验结果同时表明,3种材料在粗糙状态比光滑状态时的抗剪强度都高;随着混凝土表面越来越粗糙,3种材料的界面剪切系数急剧增大,说明材料与混凝土的抗剪能力随着混凝土表面的粗糙程度增大而增大;与此同时,界面剪切系数将不同表面状况下的抗剪能力合理拉开,更能科学地区分材料抗剪性能。材料厚度相同时,3种不同品牌材料抗剪性能差别不大;对于厚度较厚的A4材料,抗剪强度相对较高;另外,由于厚度和品牌不同,其界面剪切系数差别很大。
The three kinds of waterproof materials A, B and C were chosen to analyze the shear strength and the interfacial shear coefficient of the materials by shear tests. The different materials types, temperature and concrete surface conditions were analyzed. Shear performance changes. The results show that different materials have different sensitivities to temperature changes. Considering the sensitivity of temperature and shear strength at different temperatures, the overall evaluation of material B is relatively good. With the increase of temperature, the interfacial shear coefficient between material and concrete surface decreases gradually. The test results also show that the shear strength of the three materials is higher in the rough state than in the smooth state. As the concrete surface becomes more and more rough, the interfacial shear coefficient of the three materials increases sharply, which shows that the shear resistance of the material and the concrete Ability increases with the increase of the roughness of the concrete surface; meanwhile, the interfacial shear coefficient opens the shear capacity under different surface conditions reasonably, and scientifically distinguishes the shear resistance of the material. When the material thickness is the same, the shear resistance of the three different brands is not much different. For the thicker A4 material, the shear strength is relatively high. In addition, the interfacial shear coefficient varies greatly depending on the thickness and the brand.