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Author:

Chang, Lei (Chang, Lei.) | Wang, Jianfeng (Wang, Jianfeng.) | Cui, Suping (Cui, Suping.) (Scholars:崔素萍) | Wang, Yali (Wang, Yali.) | Liu, Hui (Liu, Hui.) | Pei, Tianrui (Pei, Tianrui.) | Li, Ziqiang (Li, Ziqiang.)

Indexed by:

EI Scopus SCIE

Abstract:

Steel slag (SS) as a supplementary cementitious material has low cementitious activity. Diethanol-isopropanolamine (DEIPA) is an organic admixture that can enhance the cementitious activity of cementitious materials. This work aimed to investigate the hydration characteristics of SS under the complexing of DEIPA. The hydration process of SS, the complexation of DEIPA with metal ions, and the dissolution process of C(3)A and C3S in the presence of DEIPA were systematically investigated. The results showed that DEIPA enhanced the hydration of aluminate (C(3)A and C(12)A(7)), ferrate (C2F) and silicate phases (C3S and C2S), which formed a large amount of monocarboaluminate, paraalumohydrocalcite and C-S-H gels. In the early stages of hydration, the hydration products were mainly C-S-H gels, monocarboaluminate and paraalumohydrocalcite, and in the later stages of hydration, the hydration products were mainly C-S-H gels, paraalumohydrocalcite. The monocarboaluminate may be transformed to paraalumohydrocalcite at a later stage. This hydration-promoting effect was related to the complexation of DEIPA. DEIPA facilitated the dissolution of mineral phases and the precipitation of complexed metal ions by complexing with metal ions. The stronger complexation of Al3+ by DEIPA made it more solubilizing for C(3)A. As a result, more aluminum-containing hydration products were formed. The weaker complexation of Ca2+ by DEIPA made it a weaker solubilizing for C3S, which also led to a weaker promotion of silicate hydration by DEIPA. The solubilization of DEIPA to minerals enhanced the cementitious activity of SS, which ultimately led to the increase in the compressive strength of the hardened SS paste at each age.

Keyword:

Hydration Steel slag Diethanol-isopropanolamine Complexation

Author Community:

  • [ 1 ] [Chang, Lei]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 2 ] [Wang, Jianfeng]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 3 ] [Cui, Suping]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 4 ] [Wang, Yali]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 5 ] [Liu, Hui]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 6 ] [Pei, Tianrui]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 7 ] [Li, Ziqiang]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 8 ] [Chang, Lei]Beijing Univ Technol, Coll Carbon Neutral Future Technol, Beijing 100124, Peoples R China
  • [ 9 ] [Cui, Suping]Beijing Univ Technol, Coll Carbon Neutral Future Technol, Beijing 100124, Peoples R China

Reprint Author's Address:

  • [Cui, Suping]Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China;;

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Source :

JOURNAL OF CLEANER PRODUCTION

ISSN: 0959-6526

Year: 2024

Volume: 447

1 1 . 1 0 0

JCR@2022

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count: 6

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 2

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