Impact of an SRA (hexylene glycol) on irreversible drying shrinkage and pore solution properties of cement pastes

Cementitious materials shrink when exposed to decreasing relative humidities, which may result in cracking. Shrinkage reducing admixtures (SRAs) can be used to reduce this drying shrinkage. Although many studies have shown that SRAs reduce the surface tension of the pore solution, the effects of SRA...

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Bibliographic Details
Published in:Cement and concrete research Vol. 143; p. 106227
Main Authors: Rahoui, Hafsa, Maruyama, Ippei, Vandamme, Matthieu, Pereira, Jean-Michel, Mosquet, Martin
Format: Journal Article
Language:English
Published: Elmsford Elsevier Ltd 01.05.2021
Elsevier BV
Elsevier
Subjects:
Admixtures
ADSORPTION
Cement
Cement paste
CEMENTS
Civil Engineering
CRACKING
Drying
Engineering Sciences
First drying shrinkage
GLYCOLS
Humidification
HUMIDITY
ISOTHERMS
Manufactured products
Mass change isotherms
Materials
MATERIALS SCIENCE
Relative humidity
SHRINKAGE
SRA
STRESSES
SURFACE TENSION
SURFACES
Temperature
Mass change isotherms
First drying shrinkage
SRA
mass change isotherms
ISSN:0008-8846, 1873-3948
Online Access:Get full text
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Summary:Cementitious materials shrink when exposed to decreasing relative humidities, which may result in cracking. Shrinkage reducing admixtures (SRAs) can be used to reduce this drying shrinkage. Although many studies have shown that SRAs reduce the surface tension of the pore solution, the effects of SRAs on other pore solution properties and their relationship to drying shrinkage have been poorly characterized. In this work, we investigate the impact of an SRA (hexylene glycol) on the drying and re-humidification of a cement paste over an extended relative humidity range. The reduction in the first drying shrinkage by the SRA depends on relative humidity. The SRA also significantly reduces the irreversible drying shrinkage. We concluded that the SRA impacts drying shrinkage by acting on the capillary forces, by acting on the specific range of relative humidity over which those forces occur, and potentially by acting on the surface stresses through pore wall adsorption. [Display omitted]
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ISSN:0008-8846
1873-3948
DOI:10.1016/j.cemconres.2020.106227