Influence of steel slag powder on the early expansion behavior of geopolymers

Haitao Yang; Shichao Yang; Zhuoran He; Xinsheng Lian; Hongbo Tan; Yi Chao Wang; Guowen Sun

Case Studies in Construction Materials (Dec 2024)

Influence of steel slag powder on the early expansion behavior of geopolymers

Haitao Yang,
Shichao Yang,
Zhuoran He,
Xinsheng Lian,
Hongbo Tan,
Yi Chao Wang,
Guowen Sun

Affiliations

Haitao Yang: Key, Laboratory of Roads and Railway Engineering Safety Control, Ministry of Education, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China; School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China; State Key Laboratory of Mechanics Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China; Corresponding authors at: Key, Laboratory of Roads and Railway Engineering Safety Control, Ministry of Education, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China.
Shichao Yang: Key, Laboratory of Roads and Railway Engineering Safety Control, Ministry of Education, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China; School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China; State Key Laboratory of Mechanics Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China
Zhuoran He: Key, Laboratory of Roads and Railway Engineering Safety Control, Ministry of Education, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China; School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China; State Key Laboratory of Mechanics Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China
Xinsheng Lian: Key, Laboratory of Roads and Railway Engineering Safety Control, Ministry of Education, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China; School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China; State Key Laboratory of Mechanics Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China
Hongbo Tan: State Key Laboratory of Silicate Materials for Architecture, Wuhan University of Technology, Wuhan, Hubei 430070, China
Yi Chao Wang: Key, Laboratory of Roads and Railway Engineering Safety Control, Ministry of Education, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China; School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China; State Key Laboratory of Mechanics Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China; State Key Laboratory of Silicate Materials for Architecture, Wuhan University of Technology, Wuhan, Hubei 430070, China
Guowen Sun: Key, Laboratory of Roads and Railway Engineering Safety Control, Ministry of Education, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China; School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China; State Key Laboratory of Mechanics Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China; Corresponding authors at: Key, Laboratory of Roads and Railway Engineering Safety Control, Ministry of Education, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China.

Journal volume & issue: Vol. 21
p. e03738

Abstract

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Volume stability is the key to limiting the application of high dosages of steel slag (SS) in geopolymers (GPs). In this paper, the effects of mixing time, particle size and dosage of SS powder, modulus and Na2O content of activators, and immersion treatment on the early expansion behavior of SS-based GPs were studied. The leaching behavior of free-oxides from SS was explored. Moreover, the mechanism of SS-induced early expansion of GPs was analyzed based on mineral composition and micromorphology of hydration products. The results reveal that the rapid expansion of SS-based GPs mainly occurs in the first 2.5–6 h, followed by slow shrinkage. Increasing the particle size of SS powder and the modulus and Na2O content of activators, decreasing the dosage of SS powder and the mixing time, and immersion treatment can reduce the early expansion of SS-based GPs. Free-CaO in SS will leach out and participate in the hydration reaction, resulting in amorphous gel phases (C-A-S-H, C-S-H, and N-A-S-H) and Ca(OH)2 in the hydration products. Indicating that the free-CaO from SS is the key to the early expansion of GPs. The substitution of ground granulated blast furnace slag for SS can reduce the leaching amount of free-CaO and consume Ca(OH)2, resulting in a reduction in the early and long-term expansion of GPs.

Published in Case Studies in Construction Materials

ISSN: 2214-5095 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.journals.elsevier.com/case-studies-in-construction-materials

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