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为研究水胶比、砂胶比和硅微粉掺量对缓凝砂浆流动性和力学性能的影响,分别测试了水胶比为0.30、0.40、0.45、0.50,砂胶比为0.5、1.0、1.5、2.0、2.5和硅微粉掺量为0.0%、5.0%、10.0%共22组缓凝砂浆的稠度、立方体抗压强度、轴心抗压强度、劈裂抗拉强度和静弹性模量。研究结果表明:随着水胶比的增大,缓凝砂浆流动性增大;随着砂胶比增大,缓凝砂浆流动性较小;硅微粉掺量增加会降低缓凝砂浆流动性。采用灰色关联理论分析水胶比、砂胶比和硅微粉掺量对硬化后缓凝砂浆的力学性能影响规律,得到水胶比为影响硬化后缓凝砂浆力学性能的关键因子,而砂胶比次之,硅微粉掺量影响相对最小。
In order to study the effects of water-binder ratio, sand-cement ratio and the content of silica micro-powder on the fluidity and mechanical properties of the retarded mortar, the water-binder ratios were tested as 0.30,0.40,0.45,0.50 and as mortar-rubber ratios were 0.5,1.0,1.5 , 2.0,2.5 and the content of silicon micropowder were 0.0%, 5.0%, 10.0%. The consistence of 22 sets of retarded mortar, cube compressive strength, axial compressive strength, splitting tensile strength and static elastic modulus. The results show that the flowability of the mortar increases with the increase of the water-binder ratio, and the flowability of the mortar decreases with the increase of the mortar ratio. The increase of the amount of silica micropowder decreases the fluidity of the mortar. Gray relational theory was used to analyze the influence of water-binder ratio, sand-cement ratio and silicon powder content on the mechanical properties of retarded mortar after curing. The water-binder ratio was the key factor that affected the mechanical properties of retarded mortar after curing. Second, the impact of the amount of silicon powder is relatively minimal.