Preparation and hydration mechanism of composite cementitious materials based on iron and steel solid waste

Hao Cui; Changlong Wang; Guangquan Zhang; Kaifan Zhang; Xingshuai Fu; Yunyi Bai; Yongchao Zheng; Yang Qi; Zhibing Liu

Alexandria Engineering Journal (Sep 2024)

Preparation and hydration mechanism of composite cementitious materials based on iron and steel solid waste

Hao Cui,
Changlong Wang,
Guangquan Zhang,
Kaifan Zhang,
Xingshuai Fu,
Yunyi Bai,
Yongchao Zheng,
Yang Qi,
Zhibing Liu

Affiliations

Hao Cui: School of Resources and Environmental Engineering, Wuhan University of Science and Technology, Wuhan, Hubei Province 430081, China
Changlong Wang: School of Civil Engineering, Hebei University of Engineering, Handan, Hebei Province 056038, China; State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control, Wuhan University of Science and Technology, Wuhan, Hubei Province 430081, China; Corresponding author at: School of Civil Engineering, Hebei University of Engineering, Handan, Hebei Province 056038, China.
Guangquan Zhang: School of Resources and Environmental Engineering, Wuhan University of Science and Technology, Wuhan, Hubei Province 430081, China; Corresponding author.
Kaifan Zhang: School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi Province 341000, China
Xingshuai Fu: School of Civil Engineering, Hebei University of Engineering, Handan, Hebei Province 056038, China
Yunyi Bai: School of Civil Engineering, Hebei University of Engineering, Handan, Hebei Province 056038, China
Yongchao Zheng: State Key Laboratory of Solid Waste Reuse for Building Materials, Beijing Building Materials Academy of Science Research, Beijing 100041, China
Yang Qi: School of Civil Engineering, Hebei University of Engineering, Handan, Hebei Province 056038, China
Zhibing Liu: School of Civil Engineering, Hebei University of Engineering, Handan, Hebei Province 056038, China

Journal volume & issue: Vol. 103
pp. 343 – 352

Abstract

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Three groups of composite cementitious materials (CCMs) were prepared by separate grinding, mixed grinding, and cascade grinding using iron and steel solid waste (ISSW) materials (granulated blast furnace slag (GBFS), iron ore tailings (IOTs), steel slag (SS) and desulfurization gypsum (DG)), and the influence on the strength of CCMs was investigated under different water-binder ratios (w/b). Then, the hydration hardening mechanism of the CCMs was revealed via hydration heat analysis, phase composition and structural analysis of hydration products. The results show that the properties of the CCMs prepared by cascade grinding (CGC) is better than that prepared by separate grinding and mixed grinding. When the mass percentage of IOTs and SS in the CGC was 2:3, the mix proportion of CGC is SS+IOTs: GBFS: DG=36:51.5:12.5, mixed with 1.0 % Na2SO4 and 1.2 % Na2SiO3ˑ9 H2O of the CGC, the compressive strength (CS) of mortar sample containing CGC in 28-days and 180-days reach 52.3 MPa and 70.7 MPa respectively under the conditions of standard curing and low water-binder ratios. The hydration degree of pure cement is higher than that of CGC, but types of the hydration products were similar with cement, mainly were Ca(OH)2, iolite, ettringite (AFt) and C-S-H gel. The CGC can greatly reduce the hydration heat of CCMs system in early age, and is suitable for massive concrete structures in which elevated temperature can be kept for a long time.

Published in Alexandria Engineering Journal

ISSN: 1110-0168 (Print); 2090-2670 (Online)
Publisher: Elsevier
Country of publisher: Egypt
LCC subjects: Technology: Engineering (General). Civil engineering (General)
Website: http://www.journals.elsevier.com/alexandria-engineering-journal/

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