镁渣硅酸盐水泥的性能

用2种不同来源的镁渣作为水泥混合材配制镁渣硅酸盐水泥。研究了其标准稠度用水量、凝结时间、强度等基本性能,考察了镁渣对水泥干燥收缩的影响,并通过XRD、DSC/TG、SEM等微观手段研究了镁渣在水泥中的作用效应。结果表明：镁渣作为水泥的混合材具有一定的减水缓凝效果;镁渣掺量在10%～30%范围内时,水泥样品符合通用硅酸盐水泥42.5R级的标准,掺量为35%～40%符合32.5R型复合硅酸盐水泥的要求;镁渣掺量为30%～40%时对水泥砂浆的干燥收缩有抑制作用;镁渣与水泥熟料水化产物发生反应,使水泥浆体结构更加致密。

Properties of Portland Cement with Magnesium Slag

Two kinds of magnesium slag from different places were added in clinker respectively to manufacture portland cement,and the essential properties of cement,such as water requirement of normal consistency,setting time and strength,were studied.The influence of magnesium slag on the drying shrinkage of portland cement was investigated.Meanwhile,effects of magnesium slag in portland cement were analyzed on the basis of XRD,DSC/TG and SEM microscopic experiments.The results show： magnesium slag plays roles in water-reducing and set-retarding as a composite material of cement;when the contents of magnesium slag range from 10%～30%（weight ratio） and 35%～40%（weight ratio）,cement samples reach Composite Portland Cement 42.5R and 32.5R standard,separately;the drying shrinkage of mortar can be restrained as the contents of magnesium slag range from 30%～40%;and the structure of cement pastes is more compacted as magnesium slag reacts with the hydrations of clinker.