钢渣对水泥砂浆早期干燥收缩和孔结构的影响  

Effects of Steel Slag Powder and Steel Slag Sand on the Early-Aged Dry Shrinkage and Pore Structure of Cement Mortar

作　　者：李楠[1,2] 张国防[1,2] 王培铭[1,2] 徐玲琳[1,2] 

机构地区：[1]同济大学先进土木工程材料教育部重点实验室,上海201804 [2]同济大学材料科学与工程学院,上海201804

出　　处：《建筑材料学报》2016年第4期712-718,共7页Journal of Building Materials

基　　金：国家自然科学基金资助项目(51102182);"十二五"国家科技支撑计划项目(2012BAJ20B02);国家重点研发计划项目(2016YFC0700905);同济大学大型仪器设备开放测试基金资助项目(0002014111;0002014080)

摘　　要：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 dry shrinkage and pore structure of cement mortar with steel slag powder（SSP） and steel slag sand（SSS） at early age were investigated. The results indicate that SSP and SSS can both decrease the early-aged dry shrinkage of cement mortar, especially at their dosages being no more than 30% （by mass）. With the variation of particle size distribution, the influence of SSS on the early-aged dry shrinkage of ce- ment mortar is somewhat different, but there exists more significant improvement of SSS with particle size smaller than 2.5 mm. The improvement on the early-aged dry shrinkage is due to the fact that both SSP and SSS can improve the pore structure and the pore size distribution to decrease the porosity of cement mortar. Besides, SSP demonstrates much better improvement on the early-aged dry shrinkage and pore structure of cement mortar than SSS. However, there is no significant improvement on the early-aged dry shrinkage and pore structure when SSP and SSS are simultaneously mixed in cement mortar.

关 键 词：水泥砂浆 钢渣粉 钢渣砂 早期干燥收缩性能 孔结构 

分 类 号：TQ528.01[化学工程—煤化学工程]