TY - JOUR
T1 - Characterization of viscoelastic behavior of synthetic alkali–silica reaction gels
AU - Gholizadeh-Vayghan, Asghar
AU - Rajabipour, Farshad
AU - Khaghani, Mehran
AU - Hillman, Michael
N1 - Funding Information:
The authors gratefully acknowledge the financial support from the U.S. National Science Foundation (NSF) under CMMI CAREER Award# 1254333 , awarded to the second author. Any opinions, findings, conclusions, or recommendations expressed in this manuscript are those of the authors solely and do not necessarily reflect the views of NSF. The invaluable experimental support of Mr. Dan Fura is greatly appreciated. The first author would like to dedicate this work to his family and especially his mother for their constant support and encouragements, which made this work possible.
Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2019/11
Y1 - 2019/11
N2 - The viscoelastic properties of ASR gels have a major impact on the gels' restrained swelling pressure and the resulting damage to concrete. This study employed a design of experiments approach to synthesize and test eighteen cylindrical ASR gel specimens of different compositions, expressed in terms of their Ca/Si, Na/Si and K/Si molar ratios. The gel cylinders were loaded uniaxially to determine their compressive strength and Poisson's ratio. In addition, the true stress−strain−time results under constant load were used, in combination with the Burgers model, to extract the viscoelastic parameters of the gels, including elastic moduli and viscosity values. These were linked to the gels' chemical composition via regression analyses. It was observed that gels with higher alkali contents had drastically reduced elastic moduli and viscosity. In contrast, the concentration of calcium in the gels generally increased such mechanical properties.
AB - The viscoelastic properties of ASR gels have a major impact on the gels' restrained swelling pressure and the resulting damage to concrete. This study employed a design of experiments approach to synthesize and test eighteen cylindrical ASR gel specimens of different compositions, expressed in terms of their Ca/Si, Na/Si and K/Si molar ratios. The gel cylinders were loaded uniaxially to determine their compressive strength and Poisson's ratio. In addition, the true stress−strain−time results under constant load were used, in combination with the Burgers model, to extract the viscoelastic parameters of the gels, including elastic moduli and viscosity values. These were linked to the gels' chemical composition via regression analyses. It was observed that gels with higher alkali contents had drastically reduced elastic moduli and viscosity. In contrast, the concentration of calcium in the gels generally increased such mechanical properties.
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U2 - 10.1016/j.cemconcomp.2019.103359
DO - 10.1016/j.cemconcomp.2019.103359
M3 - Article
AN - SCOPUS:85068371554
SN - 0958-9465
VL - 104
JO - Cement and Concrete Composites
JF - Cement and Concrete Composites
M1 - 103359
ER -