Hydration characteristics of steel slag in the presence of diethanol-isopropanolamine
Journal of Cleaner Production, ISSN: 0959-6526, Vol: 447, Page: 141448
2024
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Most Recent News
Reports Outline Environment and Sustainability Research Findings from Beijing University of Technology (Hydration Characteristics of Steel Slag In the Presence of Diethanol-isopropanolamine)
2024 MAY 16 (NewsRx) -- By a News Reporter-Staff News Editor at Ecology Daily News -- Fresh data on Environment - Environment and Sustainability Research
Article Description
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 C 3 S 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 (C 2 F) and silicate phases (C 3 S and C 2 S), 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 Al 3+ by DEIPA made it more solubilizing for C 3 A. As a result, more aluminum-containing hydration products were formed. The weaker complexation of Ca 2+ by DEIPA made it a weaker solubilizing for C 3 S, 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.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0959652624008965; http://dx.doi.org/10.1016/j.jclepro.2024.141448; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85186737094&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S0959652624008965; https://dx.doi.org/10.1016/j.jclepro.2024.141448
Elsevier BV
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