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The viscoelastic behavior of synthetic alkali-silica gels at ambient temperature
Abstract Interdisciplinary study of alkali-silica reaction (ASR) helps to relate the many aspects of the complex reaction. By combining gel synthesis, rheological measurements, and Raman spectroscopy a quantitative picture of the viscoelastic behavior of ASR products is achieved. Six ASR gels were synthesized with compositions based on Na/Si, K/Si, and Ca/Si ratios seen in previous research/field gels. Li+ was added to Na+ and K+ gels to assess its contribution to gel behavior due to its use in mitigation strategies. Analysis of the gels indicated that polymerization of the SiO2 into 3-dimensional viscoelastic networks took place over time and was dependent on the concentration and type of cations. Ca2+ gels exhibited a higher level of gel network strength earlier than Na and K-dominated gels. The addition of Li+ to Na+ gels reduced the viscoelastic behavior while K+ gels with added Li+ had increased viscosity, viscoelastic behavior and more Q4 production.
Highlights Study of synthetic ASR products regarding chemistry, structure, and rheology Six ASR gel compositions were synthesized based on previous research. Polymerization of SiO2 gels was measured using shear rheology and Raman microscopy. Yield stress was driven by chemical composition and age, often increasing with time. Li+ inhibited and increased gel polymerization based on cationic conditions.
The viscoelastic behavior of synthetic alkali-silica gels at ambient temperature
Abstract Interdisciplinary study of alkali-silica reaction (ASR) helps to relate the many aspects of the complex reaction. By combining gel synthesis, rheological measurements, and Raman spectroscopy a quantitative picture of the viscoelastic behavior of ASR products is achieved. Six ASR gels were synthesized with compositions based on Na/Si, K/Si, and Ca/Si ratios seen in previous research/field gels. Li+ was added to Na+ and K+ gels to assess its contribution to gel behavior due to its use in mitigation strategies. Analysis of the gels indicated that polymerization of the SiO2 into 3-dimensional viscoelastic networks took place over time and was dependent on the concentration and type of cations. Ca2+ gels exhibited a higher level of gel network strength earlier than Na and K-dominated gels. The addition of Li+ to Na+ gels reduced the viscoelastic behavior while K+ gels with added Li+ had increased viscosity, viscoelastic behavior and more Q4 production.
Highlights Study of synthetic ASR products regarding chemistry, structure, and rheology Six ASR gel compositions were synthesized based on previous research. Polymerization of SiO2 gels was measured using shear rheology and Raman microscopy. Yield stress was driven by chemical composition and age, often increasing with time. Li+ inhibited and increased gel polymerization based on cationic conditions.
The viscoelastic behavior of synthetic alkali-silica gels at ambient temperature
Strack, Cody M. (author) / Thornell, Travis L. (author) / Jefcoat, Jennifer A. (author) / Borne, Gordon J. (author) / Alapati, Prasanth (author) / Kurtis, Kimberly E. (author) / Moser, Robert D. (author)
2022-12-15
Article (Journal)
Electronic Resource
English
ASR , Rheology , Viscoelasticity , Viscosity , Yield stress , Lithium
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