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| Activation mechanisms of silica fume and blast furnace slag on steel slag hydrated gelling systems |
| ZHENG Wei-cheng1, ZHAO Ling1, ZHANG Hao2, LIU Zi-min3, PEI Yuan-dong4, LONG Hong-ming1 |
1. School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan 243032, Anhui, China;
2. School of Civil Engineering and Architecture, Anhui University of Technology, Ma'anshan 243032, Anhui, China;
3. Technology Center, Maanshan Iron Steel Co., Ltd., Ma'anshan 243003, Anhui, China;
4. Second Sintering Plant, Zenith Steel Group Co., Ltd., Changzhou 213011, Jiangsu, China |
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Abstract It is of great significance to strengthen the hydration process of steel slag and stimulate the cementitious activity of steel slag for improving the utilization rate of steel slag resources. In order to study the influence of the addition of blast furnace slag and silica fume, also the particle size of steel slag on improving the hydration process, the orthogonal experimental method was adopted, and the hydration products of 3 d and 28 d were characterized to reveal the activation mechanisms of silica fume and blast furnace slag on steel slag hydrated gelling systems. The orthogonal test results show that the effect of silica fume on the early 3 d hydration of steel slag is more significant, while the impact of blast furnace slag on the 28 d later hydration is more significant. when the addition of silica fume is 2%, the addition of blast furnace slag is 15%, the compression strength of steel slag at 3 d, 28 d can increase by 18.34%, 28.26%, respectively. The results of XRD, TG-DTA and SEM showed that the seeding effect, volcanic effect and the micro-assembly effect of silica fume and the relatively high activity aluminum oxyphae in the blast furnace slag can synergistically strengthen the hydration reaction in the high alkaline liquid phase system of steel slag, generating more C-S-H gel and AFt crystals. C-S-H gel is tightly wrapped in AFt crystals, and both interlaced growth form complex and compact network structures, thus improving the mechanical properties of steel slag materials and achieving the purpose of stimulating the cementitious activity of steel slag. Apply steel slag, slag, silica fume composite blend into the concrete, and the results show that when the cement is replaced by 20%, the concrete mechanical properties and anti-carbonation properties are maximized, of which 3 d, 28 d mechanical properties compared with the pure cement concrete increased by 31.53%, 25.88%, and the anti-carbonation properties compared to pure cement concrete increased by 18.75%, 24.11%, respectively.
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Received: 24 December 2021
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2022, Vol. 57 
