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Title: Cement paste prior to setting: A rheological approach

Abstract

The evolution of cement paste during the dormant period is analyzed via small amplitude oscillation rheological measurements. Cement paste, from the very first moments after mixing cement and water, shows the formation of an elastic gel whose strength is rapidly increasing over time. Up to the onset of Portlandite precipitation G′(t) increases by more than 2 orders of magnitude and in the acceleratory period G′(t) continues steadily to increase. A microstructural modification is likely to occur between the dormant and the acceleratory period. At low deformations in the linearity domain the storage modulus G′(ω) exhibits a negligible frequency dependence. At higher deformations cement paste shows a yield stress which increases on increasing paste concentration. The presence of superplasticizers decreases the yield stress and increases the gelation threshold of the paste. Above the gelation threshold the evolution of cement paste with superplasticizers follows similar trends to the neat paste. -- Highlights: •The gelation of cement paste during the dormant period is analyzed via rheometry. •The observed evolution is proposed to be related to the pore structure refinement. •Similarities are observed with colloidal gels and colloidal glasses.

Authors:
Publication Date:
OSTI Identifier:
22220816
Resource Type:
Journal Article
Journal Name:
Cement and Concrete Research
Additional Journal Information:
Journal Volume: 52; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0008-8846
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CEMENTS; DEFORMATION; FREQUENCY DEPENDENCE; GELATION; GELS; OSCILLATIONS; PLASTICIZERS; PORE STRUCTURE; PRECIPITATION; RHEOLOGY; STRESSES; WATER; YIELDS

Citation Formats

Bellotto, Maurizio. Cement paste prior to setting: A rheological approach. United States: N. p., 2013. Web. doi:10.1016/J.CEMCONRES.2013.07.002.
Bellotto, Maurizio. Cement paste prior to setting: A rheological approach. United States. https://doi.org/10.1016/J.CEMCONRES.2013.07.002
Bellotto, Maurizio. 2013. "Cement paste prior to setting: A rheological approach". United States. https://doi.org/10.1016/J.CEMCONRES.2013.07.002.
@article{osti_22220816,
title = {Cement paste prior to setting: A rheological approach},
author = {Bellotto, Maurizio},
abstractNote = {The evolution of cement paste during the dormant period is analyzed via small amplitude oscillation rheological measurements. Cement paste, from the very first moments after mixing cement and water, shows the formation of an elastic gel whose strength is rapidly increasing over time. Up to the onset of Portlandite precipitation G′(t) increases by more than 2 orders of magnitude and in the acceleratory period G′(t) continues steadily to increase. A microstructural modification is likely to occur between the dormant and the acceleratory period. At low deformations in the linearity domain the storage modulus G′(ω) exhibits a negligible frequency dependence. At higher deformations cement paste shows a yield stress which increases on increasing paste concentration. The presence of superplasticizers decreases the yield stress and increases the gelation threshold of the paste. Above the gelation threshold the evolution of cement paste with superplasticizers follows similar trends to the neat paste. -- Highlights: •The gelation of cement paste during the dormant period is analyzed via rheometry. •The observed evolution is proposed to be related to the pore structure refinement. •Similarities are observed with colloidal gels and colloidal glasses.},
doi = {10.1016/J.CEMCONRES.2013.07.002},
url = {https://www.osti.gov/biblio/22220816}, journal = {Cement and Concrete Research},
issn = {0008-8846},
number = ,
volume = 52,
place = {United States},
year = {Tue Oct 15 00:00:00 EDT 2013},
month = {Tue Oct 15 00:00:00 EDT 2013}
}