水泥-矿粉复合胶凝体系的优化配伍

发布时间：2018-04-20 10:13

本文选题：水泥--矿粉 + 颗粒群配伍　；参考：《硅酸盐学报》2014年04期

【摘要】：建立特细水泥-较粗矿粉、特细水泥-特细矿粉、普通细度水泥-普通细度矿粉、普通细度水泥-较细矿粉4个细度配伍系列,每一系列内矿粉均以一定掺量替代水泥形成复合胶凝体系试样。利用水泥与矿粉激光粒度检测结果计算复合胶凝体系的颗粒群分布,运用灰色关联分析方法计算复合胶凝颗粒群分布曲线与理想颗粒群分布—Fuller曲线的关联度;同时测定复合胶凝体系试样的胶砂流动度、净浆流变性能和不同龄期的活性值。结果表明:试样实际颗粒群分布与Fuller曲线灰色关联度值与其胶砂流动度存在良好的相关性,即灰色关联度值较高时试样的流动度较好;在掺量较低范围(低于60%)矿粉的介入对复合体系屈服应力和黏度影响有限,而大掺量后则随矿粉细度变细和掺量增加显著提高浆体的屈服应力与黏度;各细度配伍系列均呈现矿粉掺量为50%时胶砂活性值相对较高,且普通细度水泥-较细矿粉配伍试样的活性值最为理想。综上可知以比表面积为300~350m2/kg的普通细度水泥配伍比表面积为400~450m2/kg较细细度矿粉,且矿粉掺量为50%左右较为适宜。
[Abstract]:The four fineness compatibility series of ultrafine cement and coarse ore powder, ultrafine cement and ultrafine ore powder, ordinary fineness cement and ordinary fine ore powder, ordinary fineness cement and fine ore powder were established. Each series of mineral powder replaced cement with a certain amount to form a composite cementing system sample. The particle group distribution of the composite cementitious system is calculated by using the laser particle size detection results of cement and mineral powder, and the correlation degree between the distribution curve of composite cementing particle group and the ideal particle group distribution is calculated by using the grey relation analysis method. At the same time, the flowability of cement sand, the rheological properties of slurry and the activity of different ages were measured. The results show that there is a good correlation between the actual particle group distribution of the sample and the grey correlation degree of Fuller curve and the flowability of cement sand, that is, when the grey correlation degree is higher, the flow degree of the sample is better. The influence of ore powder intervention on yield stress and viscosity of composite system is limited in the lower range (less than 60%), but the yield stress and viscosity increase significantly with the increase of ore powder fineness and content. All the fineness compatibility series show that the activity value of cement sand is relatively high when the powder content is 50, and the activity value of ordinary fineness cement-fine ore powder compatibility sample is the most ideal. It can be concluded that the specific surface area of ordinary fineness cement with specific surface area of 300~350m2/kg is 400~450m2/kg, and the content of mineral powder is about 50%.
【作者单位】：同济大学先进土木工程材料教育部重点实验室;
【基金】：国家“973”重点基础研究发展规划(2009CB623104)资助项目
【分类号】：TU528

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