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研究了钢渣粉及不同粒径范围钢渣砂对水泥砂浆早期干燥收缩性能和孔结构的影响.结果表明:在一定掺量范围内,单掺钢渣粉或钢渣砂均能明显降低水泥砂浆的早期干燥收缩率,当掺量(质量分数)为30%时,改善效果尤为显著;钢渣砂粒径范围不同,对水泥砂浆早期干燥收缩率的影响有所不同,粒径小于2.5mm的钢渣砂具有明显改善作用.主要原因在于钢渣粉或钢渣砂能降低水泥砂浆的孔隙率,优化孔结构,提高密实度;相比于钢渣砂,钢渣粉对水泥砂浆早期干燥收缩性能和孔结构的改善效果更加显著,但二者复掺的改善效果并不明显.
The effects of steel slag powder and steel slag sand with different particle size range on the early drying shrinkage and pore structure of cement mortar were studied.The results show that in a certain dosage range, steel slag powder or steel slag sand can significantly reduce the early drying of cement mortar Shrinkage rate, when the content (mass fraction) is 30%, the improvement effect is especially remarkable. The range of slag sand particle size has different influence on the early drying shrinkage rate of cement mortar, and the steel slag sand with particle size less than 2.5mm has obvious The main reason is that steel slag powder or steel slag sand can reduce the porosity of cement mortar, optimize the pore structure and improve the compaction degree. Compared with steel slag sand, steel slag powder has more significant effect on early drying shrinkage and pore structure of cement mortar , But the improvement effect of the two compound doping is not obvious.