Preparation of a Composite Calcium Silicate Board with Carbide Slag and Coal-Based Solid Waste Activated by Different Alkali Activators

Dingyi Wei; Cuifeng Du; Lianfu Zhang; Yanxin Li; Lei Ba

doi:10.1021/acsomega.0c00709

Preparation of a Composite Calcium Silicate Board with Carbide Slag and Coal-Based Solid Waste Activated by Different Alkali Activators

ACS Omega. 2020 Apr 10;5(15):8934-8942. doi: 10.1021/acsomega.0c00709. eCollection 2020 Apr 21.

Authors

Dingyi Wei^{1

2}, Cuifeng Du^{1

2}, Lianfu Zhang^{1

3}, Yanxin Li⁴, Lei Ba^{1

2}

Affiliations

¹ School of Civil and Resources Engineering, University of Science and Technology Beijing, Xueyuan Road 30, Beijing 100083, China.
² State Key Laboratory of High-Efficient Mining and Safety of Metal Mines of Ministry of Education, University of Science and Technology Beijing, Xueyuan Road 30, Beijing 100083, China.
³ Norman B. Keevil Institute of Mining Engineering, University of British Columbia, Vancouver V6T 1Z4, Canada.
⁴ Barun Mining Branch, Inner Mongolia Baotou Steel Union Co., Ltd., by Share Ltd, Damao Banner, Baotou 014080, China.

Abstract

Overall performance of composite calcium silicate boards (CCSBs) was investigated to further promote their application. The alkali activators were used to fully hydrate the calcium and silicon raw materials, which further improved the comprehensive performance of the CCSBs made of four pure industrial solid wastes. Within the range of dosage in this study, single doping of different proportions of the alkali activator improved the flexural strength of the CCSB. Based on this, the mechanical properties of the CCSB were further improved as the compounded alkali activator was optimized. Flexural strength is improved when the average pore diameter was refined. The freeze-thaw cycle test shows that a compound-doped alkali activator can effectively reduce the mass loss and strength loss, thereby improving the frost resistance of this material. This research discussed an economically affordable approach to prepare the CCSB material made of industrial solid waste.