Hydration of ternary cement in the presence of triisopropanolamine

•Mixture design introduced to interpret the strength development of a ternary blend, showing that the interactions of CaCO3 and slag with TIPA were pronounced.•Hydration of C4AF phase promoted by TIPA resulting in consumptions of CH and sulfate in the early stage.•Reaction of slag improved by TIPA i...

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Bibliographic Details
Published inConstruction & building materials Vol. 111; pp. 513 - 521
Main Authors Huang, Hong, Li, Xue-run, Shen, Xiao-dong
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 15.05.2016
Elsevier B.V
Subjects
Analysis
CaCO3
Cement
Hydration
Mechanical properties
Properties
Slag
Strength
Triisopropanolamine
United States
Slag
CaCO3
Hydration
Triisopropanolamine
Strength
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Summary:•Mixture design introduced to interpret the strength development of a ternary blend, showing that the interactions of CaCO3 and slag with TIPA were pronounced.•Hydration of C4AF phase promoted by TIPA resulting in consumptions of CH and sulfate in the early stage.•Reaction of slag improved by TIPA in two ways: acceleration of the silicate reaction yielding more CH, and the faster dissolution of slag under highly alkaline conditions.•Formation of carboaluminate hydrates favored as the result of boosted C4AF/C3A–CaCO3 reactions by TIPA. The effects of triisopropanolamine (TIPA) on the strength development and hydration kinetics of a ternary cement containing slag and CaCO3 were investigated by mixture design. The strength development of the blend was considerably enhanced by the accelerated chemical reactions on each component. A very strong interaction effect of slag and CaCO3 on the strength enhancement prior to 7d was observed. The addition of TIPA promoted the hydration of laboratory cement by promoting the dissolution of ferrite, which resulted in more CH being released to participate in the reaction with slag. The dissolution of the slag itself was markedly accelerated by TIPA in a simulated highly alkaline pore solution. The use of TIPA promoted the formation of carboaluminate due to the accelerated C4AF/C3A–CaCO3 reaction, which stabilized the formation of AFt during hydration. In addition, it confirmed that Fe ions were able to enter the AFt structure during hydration with TIPA.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2016.02.079