Investigation on the utilization of coal gasification slag in Portland cement: reaction kinetics and microstructure

Fu, B., Cheng, Z., Wang, D. and Li, N. (2022) Investigation on the utilization of coal gasification slag in Portland cement: reaction kinetics and microstructure. Construction and Building Materials, 323, 126587. (doi: 10.1016/j.conbuildmat.2022.126587)

Abstract

Gasification slag is a solid waste generated by the coal chemical industry which has emerged in recent years. In this paper, the effect of coal gasification slag (CGS) powder content on the reaction kinetics, gel structure and the compressive strength of Portland cement was investigated for the potential application of CGS powders in cementitious materials. The reaction and gel structure of Portland cement blended with CGS was analyzed by using X-ray diffraction, Fourier transform infrared spectroscopy and scanning electron microscopy tests. The results show that the unreacted CGS power exists mainly in an agglomerated state in cement matrix, and a low dosage of CGS powder (10%) can play a role in nucleation and pozzolanic effect in Portland cement, which is conducive to the formation of hydration reactions of Portland cement, shortening the setting time and improving the compressive strength. If the CGS content is >30%, the hydration product content decreases, and the microstructure of the sample becomes loosened. The setting times are significantly prolonged with the increase of CGS content dosing and the compressive strength is considerably reduced as well.

• Item Type: Articles
• Additional Information: The authors gratefully acknowledge the National Natural Science Foundation of China (51668001 and 51968060), Key research and development program of Ningxia (2020BDE03009), Natural Science Foundation of Ningxia (2020AAC03195 and 2021AAC03187). The participation of Ning Li was supported by the Postdoctoral Science Foundation of China (2020M680113).
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Li, Dr Ning

Creator Roles

Li, N.: Conceptualization, Supervision, Writing – review and editing

• Authors: Fu, B., Cheng, Z., Wang, D., and Li, N.
• College/School: College of Science and Engineering > School of Engineering > Infrastructure and Environment
• Journal Name: Construction and Building Materials
• Publisher: Elsevier
• ISSN: 0950-0618
• ISSN (Online): 1879-0526
• Published Online: 31 January 2022
• Copyright Holders: Copyright © 2022 The Authors
• First Published: First published in Construction and Building Materials 323: 126587
• Publisher Policy: Reproduced under a Creative Commons License