Abstract
This study investigates the effect of three kinds of activating agent on the mechanical performance of steel slag composite materials. Hydration products of the pastes at different ages are investigated by XRD. The results show that compared with the calcium hydroxide, gypsum and sodium sulfate can excite the activation of steel slag more effectively. When amount of gypsum is 1.5%, the 3d strength increases to 1.2MPa, 7d strength increases to 3.3MPa, 28d strength increases to 5.0MPa. Ca2+ and SO42- are provided by gypsum, SiO2, Fe2O3 and Al2O3 in steel slag act with Ca(OH)2, hydration products such as hydrated calcium silicate, are generated in the paste. Enhancement of early strength may be attributed to rapidly consumption of Al2O3 in steel slag and Ca(OH)2. When amount of Na2SO4 is 1.5%, the 3d strength increases to 5.1MPa, 7d strength increases to 6.5MPa, 28d strength increases to 15.5MPa. XRD patterns show that the main products are consist of hydrated calcium silicate, Aft and calcium hydroxide. These products are bonded together, fill the void of paste, so the density increased, and higher strength are obtained.
Highlights
Ca2+ and SO42- are provided by gypsum, SiO2, Fe2O3 and Al2O3 in steel slag act with Ca(OH)2, hydration products such as hydrated calcium silicate, are generated in the paste
R Steel slag is a kind of by-product in the process of steel A making [1]
E It shows that C2S, C3S, C4AF and other minerals exist in T the steel slag, which provide the gelling properties of steel slag, but "dead burned" is formed during melting at high
Summary
R Steel slag is a kind of by-product in the process of steel A making [1]. It has become an important industrial wastes in. 10% of steel slag is currently used again in China [2], storage of large amount of steel slag will occupy land resources, cause water pollution, environmental. The. A improvement of steel slag’s cementitious activity has become one of the important ways to promote the widely. Active activation of steel slag are studied by domestic and foreign. E preparation materials and production technology, the effect Rof different activator on the hydration process and
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