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.
Hao ZHANG Xiankun YU Hongming LONG
. Properties analysis of steel slag compound replaced mineral powder, sand and stone as concrete admixture and aggregate[J]. The Chinese Journal of Process Engineering, 2020
, 20(4)
: 432
-439
.
DOI: 10.12034/j.issn.1009-606X.219230