Synthesis of alkali-silica reaction product structurally identical to that formed in field concrete

Alkali-silica reaction (ASR) can cause expansion and cracking of concrete. Despite significant progress over the past 80 years, the molecular structures of the ASR products remain poorly understood. These reaction products are present in very small amounts within concrete aggregates, which severely...

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Bibliographic Details
Published in:Materials & design 2020-05, Vol.190, p.108562, Article 108562
Main Authors: Shi, Zhenguo, Leemann, Andreas, Rentsch, Daniel, Lothenbach, Barbara
Format: Article
Language:English
Subjects:
Alkali-silica reaction
Concrete
Crystal structure
K-shlykovite
Synthesis
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Summary:Alkali-silica reaction (ASR) can cause expansion and cracking of concrete. Despite significant progress over the past 80 years, the molecular structures of the ASR products remain poorly understood. These reaction products are present in very small amounts within concrete aggregates, which severely limit their chemical and physical characterizations. In this study, synthesis of an ASR product structurally identical to that formed in field concrete is achieved in large quantities at 40 °C. The temperature is found to affect the formation of different types of crystalline ASR products: 12.0 Å (
ISSN:0264-1275
DOI:10.1016/j.matdes.2020.108562