Hydration Mechanism of All Solid Waste Cementitious Materials Based on Steel Slag and Blast Furnace Slag

doi:10.11901/1005.3093.2016.741

Chinese Journal of Materials Research

2017, Vol. 31

Issue (9): 687-694 DOI: 10.11901/1005.3093.2016.741

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Hydration Mechanism of All Solid Waste Cementitious Materials Based on Steel Slag and Blast Furnace Slag

Xiaowei CUI^1,², Wen NI¹(

), Chao REN¹

1 Beijing Key Laboratory on Resource-oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing 100083, China
2 Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources, Shangluo University, Shangluo 726000, China

Cite this article:

Xiaowei CUI, Wen NI, Chao REN. Hydration Mechanism of All Solid Waste Cementitious Materials Based on Steel Slag and Blast Furnace Slag. Chinese Journal of Materials Research, 2017, 31(9): 687-694.

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Abstract

Cementitious materials was prepared with powders of steel slag (SS), blast furnace slag (BFS) and desulfurized gypsum (DG). The influence of SS content on the strength of the concrete composted of all industrial solid wastes was investigated. The hydration mechanism of cementitious materials was characterized by means of XRD, IR, TG-DTA and SEM, while the variation of pH and concentration of the specified ions of cementitious materials were acquired during the hydration process. The results show that when the mass ratio of SS, BFS and DG is m(SS):m(BFS):m(DG)=30:58:12, the concrete possesses a better compressive strength after curing for 3 d, 7 d and 28 d. With the increasing dosage of SS, the pH value and Ca²⁺ concentration decreased first and then increased. The initial concentration of solutes of silicon (aluminum) was relatively low and then increased later. In the presence of DG, SS and BFS can synergistically promote the hydration and the major hydration products are ettringite (AFt) and calcium silicate hydrate (C-S-H) gels. During the later stage of the hydration process, the quantity of hydration products increased rapidly, forming a composite of C-S-H gel as matrix, within which there existed randomly dispersed needle-like AFt crystallites as strengthening phase, thereby, the hardened cement paste became much dense and hard.

Key words: inorganic non-metallic materials steel slag cementitious materials hydration mechanism

Received: 19 December 2016

ZTFLH:

TB321

Fund: Supported by National High Technology Research and Development Program of China (No.2012AA062405), Comprehensive Utilization of Tailing Resources Key Laboratory of Shaanxi Province (No.2014SKY-WK001) and Natural Science Foundation of Shaanxi Province (No.2017JM5125)

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.741 OR https://www.cjmr.org/EN/Y2017/V31/I9/687

Fig.1 XRD pattern of steel slag

Table 1 Chemical composition of raw materials (%, mass fraction)

Table 2 Composition of cementitious materials (%, mass fraction)

Fig.2 Influence of proportion of steel slag powder on strength of concrete

Fig.3 Influence of proportion of steel slag powder on pH of cementitious materials

Fig.4 Influence of proportion of steel slag powder on representative concentration of the ions (a) Ca²⁺; (b) Silicon solutes; (c) Aluminum solutes

Fig.6 IR spectra of pastes at different ages

Fig.7 TG-DTA curves of hydrated pastes at 3 day

Fig.8 TG-DTA curves of hydrated pastes at 28 day

Fig.9 SEM images of pastes at different ages (a) cured for 3 d; (b) cured for 7 d; (c) cured for 28 d; (d) further magnification of Fig.c

Fig.10 Schematic diagram of the hydration reaction mechanism of cementitious materials

Fig.11 Hydration process model of SS(BFS)

Fig.5 XRD pattern of pastes at different ages

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