Study on durability and hydration mechanism of low clinker concrete containing steel slag
WANG Kun1, LI Ying1, ZHANG Guang-tian2
1. School of Civil and Resource Engineering,University of Science and Technology Beijing, Beijing 100083, China; 2. Hebei Province Science and Technology Key Laboratory of Solid Waste Used to Building Materials, Hebei Academy of Building Research Co., Ltd., Shijiazhuang 050021, Hebei, China
Abstract：The influences of different content of steel slag on carbonization, electric flux and frost resistance of C40 low clinker concrete were studied. The results showed that low clinker concrete had the minimum carbonation depth and the carbonation resistance level T-Ⅳ when the content of steel slag was 15%. The resistance of concrete to chloride penetration and freezing and thawing was best when the content of steel slag was 10%, reaching level Q-Ⅴ and F275, respectively. The hydration mechanism of low clinker cementitious material containing 10% steel slag was analyzed by means of XRD, IR and SEM. The results showed that the major hydration products were calcium silicate hydrate (C-S-H) gels and ettringite (AFt). The cement clinker and steel slag were hydrated successively, then the resulting OH- gradually dissociated the silicon (aluminum) oxygen tetrahedron in blast furnace slag, and C-S-H gels and AFt were formed under the combined action of SO2-4. The hydration of blast furnace slag and steel slag promoted each other, so that the cementitious system still produced a large number of hydration products in the later period, which played an important role in improving the strength and compactness of concrete in the later period.
汪坤, 李颖, 张广田. 含钢渣的低熟料混凝土耐久性及水化机理研究[J]. 中国冶金, 2020, 30(10): 92-97.
WANG Kun, LI Ying, ZHANG Guang-tian. Study on durability and hydration mechanism of low clinker concrete containing steel slag[J]. China Metallurgy, 2020, 30(10): 92-97.
2020, Vol. 30 
