Development of Autoclaved Aerated Concrete from Mechanically Activated Magnesium-Rich Nickel Slag
Publication: Journal of Materials in Civil Engineering
Volume 30, Issue 7
Abstract
Nickel slag autoclaved aerated concrete (NS-AAC) was fabricated through a hydrothermal synthesis method by using a novel solid waste, mechanically activated magnesium-rich NS, as the main raw material. The influence of the calcium:silicon () ratio on the macroscopic and microscopic performance of NS-AAC was investigated. NS-AAC was analyzed by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM). Results showed that a formulation with 0.65 of exhibited exceptional compressive and flexural strength, which were 3.5 and 2.1 MPa, respectively. The hydrothermal production of NS-AAC, transformed from C-S-H and Ettringite (AFt) to interfingered and overlapped tobermorite and anhydrite, resulted in exceptional mechanical properties. This work proposes a novel approach for the utilization of NS.
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Acknowledgments
This study was funded by the National Natural Science Foundation of China (No. 51572234) and the joint research fund of the Collaborative Innovation Center for Ecological Building Materials and Environmental Protection Equipments (grant number CP201506). The authors also thank Delong Nickel Industry Co., Ltd. (Xiangshui, China), Huaneng Nanjing Power Plant (Nanjing, China), Jiangsu Ling Eight Conch Cement Co., Ltd. (Yancheng, China), Yancheng Botuo Building Materials Co., Ltd. (Yancheng, China), and Sobute New Materials Co., Ltd. (Nanjing, China) for the supply of nickel slag, fly ash, original portland cement, lime, gypsum, aluminum powder, and superplasticizer, respectively.
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©2018 American Society of Civil Engineers.
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Received: Feb 16, 2017
Accepted: Jan 10, 2018
Published online: Apr 30, 2018
Published in print: Jul 1, 2018
Discussion open until: Sep 30, 2018
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