沙漠砂混凝土力学性能研究

Research on the mechanical properties of desert sand concrete

通过正交试验,分析了沙漠砂替代率、粉煤灰掺量、砂率和水胶比对沙漠砂混凝土7、28、56 d抗压强度和28 d劈裂抗拉强度影响;在正交试验基础上,进一步揭示沙漠砂替代率和粉煤灰掺量对混凝土28 d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10%时,沙漠砂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。

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 7 d,28 d,56 d compressive strength and 28 d splitting tensile strength of 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 28 d compressive strength and splitting tensile strength of desert sand concrete was further analyzed. Experimental results show that with the increase of desert sand replacement ratio,the 28 d compressive strength and splitting tensile strength of desert sand concrete increases firstly,then declines.When desert sand replacement ratio amounts to 20%, the 28 d compressive strength and splitting tensile strength of desert sand concrete reaches maximum. With the enhancement of fly ash dosage, the 28 d compressive strength and splitting tensile strength of desert sand concrete also increases firstly ,then declines.When fly ash dosage amounts to 10% ,the 28 d com- pressive strength and splitting tensile strength of desert sand concrete reaches maximum, which provides guidance for the engineering ap- plication of desert sand.