Hydration activity and mechanical properties of steel slag used as cementitious materials

Abstract

The massive steel slag not only occupies land resources but also pollutes the environment, so it is necessary to efficiently utilize steel slag. In this article, the hydration activity and mechanical properties of steel slag used as cementitious materials were studied. Results showed the steel slag was difficult to hydrate at room temperature within 3 days. After the steel slag was autoclaved at 215°C, 2 MPa for 3 h, its hydration degree was 1/3 of that of Portland cement. The expansion rate of the steel slag‐cement cementitious materials increased linearly with the increase of steel slag content. When the content of steel slag was 60%, the specimen was cracked under boiled conditions and pulverized under autoclaved conditions. The strength of mortar first increased and then decreased with the increase of steel slag content. When the content of steel slag was 10%, the mortar produced the highest 28‐day compressive strength of 49.01 MPa and flexural strength of 8.78 MPa.

Quantitative analysis and phase assemblage of basic oxygen furnace slag hydration

“…The studies of Wang et al and Zhu et al found new reaction products, C-S-H gel and Ca(OH) 2 , while improving the hydration of steel slag by increasing the temperature and adding NaOH [8] as well as grinding aids [33]. Hou and Liu [34] later improved the hydration by autoclaving and found the same hydration products. However, in these investigations, the hydration products, the overall reactivity, and the hydration reactions were not quantified.…”

Effects of nano titanium and nano silica on high‐strength concrete properties incorporating heavyweight aggregate

“…High-density aggregate is obtained by mechanical grinding of rocks containing heavy metals with a density equal to or more than 3000 kg/m 3 . 1 Many types of rocks include heavy metals such as hematite, ilmenite, steel slag (SS), [2][3][4][5] and barite. 6 Concrete with a density higher than 2600 kg/m 3 is HWC.…”