探究水热条件下钢渣复掺胶凝体系的膨胀性能

Exploring the Expansion Properties of Steel Slag Compounding Gel System Under Hydrothermal Conditions

试验采用陈化热闷钢渣制备水泥砂浆试件,并考虑外掺矿物掺合料,探究其对钢渣砂浆试件的膨胀发展规律。以砂浆试件14d内日膨胀率为指标,分析钢渣水泥砂浆试件在水热养护条件下产生膨胀破坏的机理。试验结果表明:单掺钢渣粉和单掺钢渣砂均能有效抑制水热条件下水泥砂浆试件的膨胀率,但钢渣粉较钢渣砂抑制膨胀率的效果要好。钢渣砂与矿物掺合料复掺的胶凝体系,对水泥砂浆试件膨胀率的抑制效果具有不同的差异。复掺胶凝体系均表现出随着复掺钢渣砂掺量的增加,对应试件的膨胀率是逐渐增大的,但通过对比分析,矿渣粉与钢渣砂复掺时对砂浆试件的膨胀抑制效果较好,且在14d养护龄期内无膨胀断裂破坏。

It uses Chenhua hot and suffocating steel slag to prepare cement mortar test pieces, and considers the mineral admixture with external minerals to explore the expansion and development law of steel slag mortar test pieces. Based on the daily expansion ratio of the mortar specimen 14 d, the mechanism of expansion and failure of the steel slag cement mortar specimen under hydrothermal curing conditions was analyzed. The test results show that the steel slag powder and the single steel slag sand can effectively inhibit the expansion rate of the cement mortar specimen under hydrothermal conditions, but the steel slag powder has better effect on suppressing the expansion ratio than the steel slag sand. The cementation system of steel slag sand and mineral admixture has different effects on the inhibition effect of cement mortar specimen expansion rate. The compounding gel system showed that the expansion ratio of the corresponding test piece increased gradually with the increase of the amount of the mixed steel slag sand, but through comparative analysis, the slag powder and the steel slag sand were mixed with the mortar test piece. The swelling inhibition effect is better, and there is no expansion fracture failure during the 14 d curing period.