高细石灰石粉与矿渣粉复合配制高强水泥试验研究

Study of combined effect of high fineness limestone powder and GGBS on the high strength cement preparation

按正交试验方法设计了不同比例高细石灰石粉、矿渣粉和粉煤灰掺入到P.Ⅰ42.5R硅酸盐水泥中的多组样品,使用RRSB线性回归得到样品的颗粒群分布,并检验样品的物理性能。结果表明,高细石灰石粉和矿渣粉可以明显改善水泥的粒度分布,增加水泥细微颗粒含量,显著提高水泥早期、后期和长期强度。将60%的P.Ⅰ42.5R硅酸盐水泥、6%的高细石灰石粉、30%矿渣粉和4%粉煤灰混合可以配制3d、28d和90d抗压强度分别为38.5MPa、71.2MPa和76.5MPa的高强水泥,与P.Ⅰ42.5R硅酸盐水泥比较,3d、28d和90d抗压强度分别提高约7MPa、10MPa和13MPa。

The different proportion of high fineness lime stone, GGBS powder and fly ash was added into P-I 42.5R Portland cement to prepared several samples by orthogonal experiment design, the particle size distribution of sample was obtained by RRSB linear regress and the physical performance of the sample was tested. The results showed that the high fineness lime stone powder and GGBS powder could improve the cement gradation particle size distribution, increase the content of high fineness particle, and then increase the strength of the cement at each curing period. The compressive strength of the cement admixed with the content of 60% P-I 42.5R Portland cement and 6% high fineness lime stone powder amt 30% GGBS powder and 4% fly ash could reach to 38.5MPa in 3d, 71.2MPa in 7d and 76.5MPa in 90d, compared with the P-I 42.5R Portland cement, the strength increased 7MPa, I OMPa and 13MPa in corresponding curing age.