TY - JOUR
T1 - Composition-rheology relationships in alkali-silica reaction gels and the impact on the Gel's deleterious behavior
AU - Gholizadeh Vayghan, Asghar
AU - Rajabipour, Farshad
AU - Rosenberger, James L.
N1 - Funding Information:
The authors gratefully acknowledge the financial support from the years, which made it possible for him to accomplish this research. National Science Foundation (NSF) under CMMI CAREER Award no. 1254333, awarded to the second author. Any opinions, findings, conclusions, or recommendations expressed in this article are solely those of the authors and do not necessarily reflect the views of NSF. The technical support and guidance of Dan Fura are greatly appreciated. The first author would like to thank the support and endless encouragement and love of his wife Fatemeh in the last 2
Publisher Copyright:
© 2016 Elsevier Ltd. All rights reserved.
PY - 2016/5/1
Y1 - 2016/5/1
N2 - Alkali-silica reaction (ASR) continues to be a major challenge to the durability of concrete structures. This is in part because the relationships between the composition, properties, and behavior of ASR gels in concrete are poorly understood. Gels with high pore solution pH, osmotic pressure, and rheological (e.g., yield stress) and swelling properties are the most deleterious. In this paper, the effects of the composition (primarily Ca/Si and Na/Si) of synthetic ASR gels on these characteristics are investigated, and regression analyses are done on the data. The pessimum combination of osmotic and rheological properties was found in the case of gels having intermediate calcium and high sodium contents (i.e., Ca/Si = 0.2 and Na/Si ≈ 0.85), leading to the highest estimated swelling pressures. These gels also developed the most alkaline pore solutions. While highest yield stresses were observed in the gels with low calcium and low sodium, they showed negligible osmotic and swelling pressures.
AB - Alkali-silica reaction (ASR) continues to be a major challenge to the durability of concrete structures. This is in part because the relationships between the composition, properties, and behavior of ASR gels in concrete are poorly understood. Gels with high pore solution pH, osmotic pressure, and rheological (e.g., yield stress) and swelling properties are the most deleterious. In this paper, the effects of the composition (primarily Ca/Si and Na/Si) of synthetic ASR gels on these characteristics are investigated, and regression analyses are done on the data. The pessimum combination of osmotic and rheological properties was found in the case of gels having intermediate calcium and high sodium contents (i.e., Ca/Si = 0.2 and Na/Si ≈ 0.85), leading to the highest estimated swelling pressures. These gels also developed the most alkaline pore solutions. While highest yield stresses were observed in the gels with low calcium and low sodium, they showed negligible osmotic and swelling pressures.
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U2 - 10.1016/j.cemconres.2016.01.011
DO - 10.1016/j.cemconres.2016.01.011
M3 - Article
AN - SCOPUS:84957970197
SN - 0008-8846
VL - 83
SP - 45
EP - 56
JO - Cement and Concrete Research
JF - Cement and Concrete Research
ER -