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Reactivity and Hydration Property of Synthetic Air Quenched Slag with Different Chemical Compositions

College of Materials Science and Engineering, Key Laboratory of Advanced Functional Materials, Education Ministry of China, Beijing University of Technology, Beijing 100124, China
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Materials 2019, 12(6), 932; https://doi.org/10.3390/ma12060932
Received: 3 March 2019 / Revised: 13 March 2019 / Accepted: 15 March 2019 / Published: 20 March 2019
(This article belongs to the Special Issue Sustainability in Construction and Building Materials)
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Abstract

Air quenched slag is processed by a fast air cooling method which is developed with the advantages of recovering heat from molten slag and water conservation compared to the water quenching method. Air quenched slags with different chemical compositions are synthesized in the lab by designing three chemical composition ratios: (CaO + MgO)/(SiO2 + Al2O3), CaO/MgO and SiO2/Al2O3, which are donated as CM/SA, C/M and S/A, respectively. The effect of different chemical compositions on the phase compositions of synthetic air quenched slag, the strength and hydration properties of slag blends were investigated by using various characterization techniques. The results show that the amorphous content of air quenched slag decreased with the increasing basicity CM/SA of slag. The S/A ratio of slag was the dominant factor for the compressive strength of slag blends at 28 days and negatively correlated with strength. Decreasing the S/A ratio of slag increased the reactivity of slag and its reaction degree indicated by higher hydration heat release, lower CH content, greater chemical combined water amount and denser microstructure. Moreover, thermodynamic modelling revealed that a higher S/A of slag leads to the increase of C-(A)-S-H and AFt contents, whilst decreasing the amounts of Ht, AFm-SO4 phases and the total volume of hydrates. View Full-Text
Keywords: air quenched slag; chemical composition ratios; amorphous content; compressive strength; hydration air quenched slag; chemical composition ratios; amorphous content; compressive strength; hydration
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Wang, H.; Wang, Y.; Cui, S.; Wang, J. Reactivity and Hydration Property of Synthetic Air Quenched Slag with Different Chemical Compositions. Materials 2019, 12, 932.

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