刘海峰,付 杰,马菊荣,杨维武,陈云龙
沙漠砂高强混凝土力学性能研究
刘海峰,付 杰,马菊荣,杨维武,陈云龙
摘 要:通过正交试验,分析了粉煤灰掺量、沙漠砂替代率、砂率和水胶比对沙漠砂高强混凝土7d、28d、56d和100d抗压强度的影响;在正交试验基础上,保持砂率和水胶比不变,进一步揭示沙漠砂替代率和粉煤灰掺量对沙漠砂高强混凝土28d抗压强度和劈裂拉伸强度的影响规律。试验研究表明,随着沙漠砂替代率增加,沙漠砂高强混凝土抗压强度和劈裂拉伸强度呈现先增大后减小趋势,沙漠砂替代率为20%时,沙漠砂高强混凝土抗压强度和劈裂拉伸强度均达到最大值;随着粉煤灰掺量增加,沙漠砂高强混凝土抗压强度和劈裂拉伸强度先增大后减小,粉煤灰掺量为15%时,沙漠砂高强混凝土抗压强度和劈裂拉伸强度达到最大值,为沙漠砂在工程中的应用提供指导和借鉴。
Abstract: The orthogonal experiment is carried out to analyze the influence of water-binder ratio, fly ash dosage, sand ratio and desert sand replacement ratio on the 7d, 28d, 56d and 100d compressive strength of high strength desert sand concrete. On the basis of the optimal mixture ratio from orthogonal experiment, the regulation on the influence of fly ash dosage and desert sand replacement ratio on the 28d compressive strength and splitting tensile strength of high strength desert sand concrete is further analyzed. Experimental results show that with the increase of desert sand replacement ratio, the 28d compressive strength and splitting tensile strength of high strength desert sand concrete firstly increases, then declines. When desert sand replacement ratio amounts to 20%, the 28d compressive strength and splitting tensile strength of high strength desert sand concrete reaches maximum. With the enhancement of fly ash dosage, the 28d compressive strength and splitting tensile strength of high strength desert sand concrete also increases firstly, then declines. When fly ash dosage amounts to 15%, the 28d compressive strength and splitting tensile strength of high strength desert sand concrete reaches maximum, which provides guidance for the engineering application of desert sand.
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