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探讨了熟料中MgO含量对水泥收缩和水化的影响。通过X射线衍射和热重分析分别对不同氧化镁含量的熟料A矿晶型、方镁石相对含量和水泥水化产物进行了表征,并测试了3种养护条件下水泥的收缩特性。结果表明:熟料中的方镁石含量随着MgO含量增加而增加,方镁石早期水化速率较快,提高养护温度可以加速方镁石早期水化,方镁石水化膨胀能够降低水泥在干燥环境中的收缩,增加水浴环境中的膨胀。Mg(OH)_2以无定型、六方片状等形态存在于水化后的水泥中,且富集于Ca(OH)_2附近,并与Ca(OH)_2共同碳化生成CaMg(CO_3)_2等晶体。
The effect of MgO content in clinker on shrinkage and hydration of cement was discussed. The crystal form of magnesia A, the relative content of periclase and cement hydration products with different magnesia content were characterized by X-ray diffraction and thermogravimetric analysis, and the shrinkage characteristics of cement under three curing conditions were tested. The results show that the content of periclase in clinker increases with the increase of MgO content, and the early hydration rate of periclase is faster. Increasing the curing temperature can accelerate the early hydration of periclase, and hydration of periclase can reduce the content of cement Shrinkage in a dry environment, increasing swelling in a water bath environment. Mg (OH) _2 exists in the hydrated cement in the shape of amorphous and hexagonal flakes, and is enriched in the vicinity of Ca (OH) _2 and carbonized with Ca (OH) _2 to form CaMg (CO_3) _2 Crystal.