砂灰比和砂的级配对CA砂浆抗压强度和流动性的影响

Influence of m(S)/m(C) and sand gradation on compressive strength and fluidity of CA mortar

通过调整砂与水泥的质量比和调整2种单级配砂的质量比，研究了砂灰比和砂的级配对CA砂浆的抗压强度和流动性的影响。结果表明：随着m（S）／m（C）的增大，低强和高强CA砂浆的流动性都变差，但低强CA砂浆流动性的变化幅度较小；随着m（S）／m（C）的增大，高强CA砂浆的抗压强度降低，而低强CA砂浆的抗压强度呈升高的趋势；使用两级配砂能够提高CA砂浆的抗压强度并改善其流动性，粒径为0．42-0．21mm的砂与粒径0．85-0．30mm的砂的最佳质量比为6：4。

Effect of m（ S）/m（C） and sand gradation on compressive strength and fluidity of CA mortar was studied by changing the sand cement ratio and the proportion of two kinds of sand with different particle sizes. The results show that the fluidity of both low strength CA mortar and high strength CA mortar decreases with the increase of m （S）/m （ C ）, but the fluidity＇ s changing extent of low strength CA mortar is not significant. The compressive strength of high strength CA mortar decreases with the increase of m （S）/m （ C ）, while the changing trend of low strength CA mortar is opposite. Using complex of two kinds of sand with particle size of 0.42 -0.21 mm and 0.85 -0.30 mm in CA mortar can elevate the compressive strength and improve the fluidity. The most suitable ratio between them is 6： 4.