The influence of alkali–silica reaction (ASR) gel composition on its hydrophilic properties and free swelling in contact with water vapor

Asghar Gholizadeh-Vayghan, Farshad Rajabipour

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Synthetic ASR gels with 20 different chemical compositions similar to those found in field concretes were produced, and the effects of composition (i.e., Ca/Si, Na/Si and K/Si) on their hydrophilic and swelling behavior were investigated. Minibar gel specimens were cast and tested for time dependent measurement of the free swelling strain and weight change of the gels when exposed to 95% RH. The equilibrium relative humidity (ERH) of the gels was also measured for assessing their hydrophilic potential. The results suggest that higher Na/Si and K/Si increase the free swelling and water absorption of the gels, and reduce their ERH. Ca/Si showed a multi–episode effect on the swelling and water absorption of the gels, while showing no significant effect on their ERH. Discussions on the observed effects are provided and regression models for predicting the swelling and hydrophilic properties of the gels are developed.

Original languageEnglish (US)
Pages (from-to)49-58
Number of pages10
JournalCement and Concrete Research
Volume94
DOIs
StatePublished - Apr 1 2017

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Steam
Water vapor
Swelling
Gels
Chemical analysis
Atmospheric humidity
Water absorption
Concretes

All Science Journal Classification (ASJC) codes

  • Building and Construction
  • Materials Science(all)

Cite this

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abstract = "Synthetic ASR gels with 20 different chemical compositions similar to those found in field concretes were produced, and the effects of composition (i.e., Ca/Si, Na/Si and K/Si) on their hydrophilic and swelling behavior were investigated. Minibar gel specimens were cast and tested for time dependent measurement of the free swelling strain and weight change of the gels when exposed to 95{\%} RH. The equilibrium relative humidity (ERH) of the gels was also measured for assessing their hydrophilic potential. The results suggest that higher Na/Si and K/Si increase the free swelling and water absorption of the gels, and reduce their ERH. Ca/Si showed a multi–episode effect on the swelling and water absorption of the gels, while showing no significant effect on their ERH. Discussions on the observed effects are provided and regression models for predicting the swelling and hydrophilic properties of the gels are developed.",
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AU - Gholizadeh-Vayghan, Asghar

AU - Rajabipour, Farshad

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AB - Synthetic ASR gels with 20 different chemical compositions similar to those found in field concretes were produced, and the effects of composition (i.e., Ca/Si, Na/Si and K/Si) on their hydrophilic and swelling behavior were investigated. Minibar gel specimens were cast and tested for time dependent measurement of the free swelling strain and weight change of the gels when exposed to 95% RH. The equilibrium relative humidity (ERH) of the gels was also measured for assessing their hydrophilic potential. The results suggest that higher Na/Si and K/Si increase the free swelling and water absorption of the gels, and reduce their ERH. Ca/Si showed a multi–episode effect on the swelling and water absorption of the gels, while showing no significant effect on their ERH. Discussions on the observed effects are provided and regression models for predicting the swelling and hydrophilic properties of the gels are developed.

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