Investigation of the retarding effect of superplasticizers on cement hydration by impedance spectroscopy and other methods

The influence of three different superplasticizers: sodium poly-naphthalene sulfonate (NaPNS), calcium poly-naphthalene sulfonate (CaPNS) and sodium poly- melamine sulfonate (NaPMS) on portland cement hydration and micro-structure development was investigated. SEM, TGA and IS results indicated that,...

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Bibliographic Details
Published in:Cement and concrete research 1994, Vol.24 (3), p.433-442
Main Authors: Gu, Ping, Xie, Ping, Beaudoin, J.J., Jolicoeur, C.
Format: Article
Language:English
Subjects:
Applied sciences
Buildings. Public works
Cement concrete constituents
Cements
Exact sciences and technology
Hydration
Materials
Properties of anhydrous and hydrated cement, test methods
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Summary:The influence of three different superplasticizers: sodium poly-naphthalene sulfonate (NaPNS), calcium poly-naphthalene sulfonate (CaPNS) and sodium poly- melamine sulfonate (NaPMS) on portland cement hydration and micro-structure development was investigated. SEM, TGA and IS results indicated that, at high dosages, superplasticizers not only had a significant effect on the early cement hydration process, but on later microstructure development as well. At the same w/c ratio, the microstructure of pastes containing superplasticizers developed at much slower rate than in the control paste. As empirical equation, P=P o−At n appeared to best describe porosity development of hydrating portland cement pastes in these studies.
ISSN:0008-8846
1873-3948
DOI:10.1016/0008-8846(94)90130-9