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用差热分析、热失重分析、X射线分析等半定量方法,研究了掺入MF减水剂对硅酸盐水泥水化动力学过程的影响,并用扫描电镜和水银压入测孔法研究了掺与不掺MF减水剂的水泥砂浆结构。试验结果表明:MF减水剂加入后水泥砂浆强度提高的原因不是由于加速了水泥的水化速度,主要是改善了水泥砂浆的结构,即减少了水泥砂浆的总孔隙率并使孔隙变小,从而使结构变得致密,并由于MF减水剂的分散作用使水泥砂浆结构变得均匀。 经上述工具鉴定,未发现掺MF减水剂的水泥有新的水化产物的形成。
Using semi-quantitative methods such as differential thermal analysis, thermogravimetric analysis, and X-ray analysis, the influence of MF superplasticizers on the hydration kinetics of Portland cement was studied. Scanning electron microscopy and mercury porosimetry were studied. Blended cement mortar structure without MF superplasticizer. The test results show that the reason for the improvement of the strength of the cement mortar after the addition of the MF water-reducing agent is not due to the acceleration of the hydration rate of the cement, but mainly to improve the structure of the cement mortar, that is, to reduce the total porosity of the cement mortar and make the pores smaller. As a result, the structure becomes dense, and the structure of the cement mortar becomes uniform due to the dispersion of the MF water-reducing agent. As identified by the above tools, no new hydrated product was found in the cement blended with the MF water-reducing agent.