钢渣复合取代矿粉、砂和石用作混凝土掺合料与骨料及其性能分析

用风淬渣粉取代矿粉、电炉渣砂取代混合砂、电炉渣石取代碎石制备混凝土，分析了混凝土的内照射指数、外照射指数、f-CaO含量、沸煮膨胀值、比表面积、密度、含水率、容重、含泥量、泥块含量、坍落度、抗压强度及其化学组成、矿物组成与微观形貌，研究了钢渣的安全性与稳定性及风淬渣粉取代矿粉、电炉渣砂取代混合砂、电炉渣石取代碎石与钢渣复合取代矿粉、砂和石对混凝土性能的影响。结果表明，风淬渣粉、电炉渣砂和电炉渣石的安全性与稳定性满足国标要求，可用于混凝土。当风淬渣粉取代20wt%矿粉、电炉渣砂取代10wt%混合砂和电炉渣石取代20wt%碎石时，混凝土的性能最优。钢渣复合取代矿粉、砂和石的比例合适，可改善混凝土的界面结构密实度，尤其能提高混凝土养护后期的强度。

Properties analysis of steel slag compound replaced mineral powder,sand and stone as concrete admixture and aggregate

With steel slag as the research object, concrete was prepared by using wind slag powder replaced mineral powder, electric furnace slag sand replaced mixed sand and electric furnace slag stone replaced crushed stone. Internal exposure index, external exposure index, content of f-CaO, boiling expansion value, specific surface area, density, moisture content, bulk density, contents of mud and soil, slump and compressive strength of concrete were tested. The chemical component, mineral composition and microstructure of concrete were analyzed. The safety and stability of steel slag, effects of wind slag powder replaced mineral powder, electric furnace slag sand replaced mixed sand, electric furnace slag stone replaced crushed stone and steel slag compound replaced mineral powder, sand and stone on the properties of concrete were studied. The results showed that the safety and stability of wind slag powder, electric furnace slag sand and electric furnace slag stone met the standard requirements and could be used in concrete. When wind slag powder replaced 20wt% of mineral powder, electric furnace slag sand replaced 10wt% of mixed sand and electric furnace slag stone replaced 20wt% of crushed stone, the properties of concrete were the best. Reasonable proportion of steel slag compound replaced mineral powder, sand and stone could improve the interface structure compactness of concrete, especially the late age strength of concrete.