普通硅酸盐-硫铝酸盐复合胶凝体系混凝土的力学性能研究

Mechanical Properties of Portland Cement-Sulphoaluminate Cement Compound System Concrete

在硫铝酸盐水泥(SAC)混凝土中分别掺入10%、20%、30%、40%、50%的普通硅酸盐水泥(P·O),对复合胶凝体系混凝土的抗压强度、劈裂抗拉强度等基本力学性能进行试验分析。结果表明,随着P·O掺量的增加会降低复合胶凝体系混凝土的早期抗压强度,但有利于后期抗压强度的提高,其中P·O掺量为30%时28d抗压强度最佳。纯SAC混凝土的劈裂抗拉强度后期会产生倒缩现象,通过掺加P·O后,复合胶凝体系混凝土后期的劈裂抗拉强度随着P·O掺量的增加得到恢复并逐渐提高。利用扫描电子显微镜(SEM)对部分试样进行分析测试,展现出的微观形貌特征与强度特性相吻合,并从微观角度解释了硫铝酸盐水泥混凝土劈裂抗拉强度倒缩的原因。

Adding 10%, 20%, 30%, 40%, 50% ordinary Portland cement(P·O) to sulphoaluminate cement(SAC) concrete, The experimental analysis of the basic mechanical properties such as compressive strength and split tensile strength of composite system concrete. The results show that with the increase of the content of P·O, the early compressive strength of the composite system concrete will decrease. But it is beneficial to the improvement of compressive strength in the later stage, The compressive strength at 28 d was the best when the P·O content was 30%. The splitting tensile strength of pure SAC concrete will cause shrinkage in the later stage, After the addition of P·O, the splitting tensile strength of the composite system concrete in the later period is restored and gradually increased with the increase of the amount of P·O. The scanning electron microscope(SEM) was used to analyze and test some samples, and the microscopic morphological characteristics and strength characteristics exhibited were consistent, and the reason for the decrease in the split tensile strength of sulphoaluminate cement concrete was explained from a microscopic perspective.