AI Article Synopsis
- The study aims to clarify the properties and functions of the reaction rim in alkali-silica reactions by creating a simplified calcium-alkali-silicate system for analysis.
- A transport barrier was discovered at the interface of alkali silicate and calcium hydroxide, which restricts the movement of calcium and silicate ions.
- This barrier is primarily made up of calcium alkali silicate, with specific silicon-oxygen structures identified and specific calcium to silica and alkali to silica ratios observed during the analysis.
Article Abstract
This work is intended to provide a better understanding about the properties and roles of the reaction rim in an alkali-silica reaction. A simplified calcium-alkali-silicate system was created to simulate the multiple interactions among reactive silica, alkaline solution and portlandite near the aggregate surface during the formation and evolution of the reaction rim in an alkali-silica reaction. A transport barrier preventing the migration of calcium and silicate through itself was found on the interface between the alkali silicate and the calcium hydroxide. The barrier was mainly composed of calcium alkali silicate with silicon-oxygen organizations of Q² and Q³ according to the results of Si nuclear magnetic resonance, the calcium to silica mole ratio ranging from 0.22 to 0.53 and the alkali to silica ratio ranging from 0.20 to 0.26 based the location of the elemental compositional analysis and the storage period of the system.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5510727 | PMC |
| http://dx.doi.org/10.3390/ma9080670 | DOI Listing |
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