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Materials 2016, 9(8), 670; doi:10.3390/ma9080670

Studies on the Alkali–Silica Reaction Rim in a Simplified Calcium–Alkali–Silicate System

1
Magnel Laboratory for Concrete Research, Department of Structural Engineering, Ghent University, Ghent 9000, Belgium
2
Applied and Analytical Chemistry, Institute for Materials Research, University of Hasselt, Hasselt 3590, Belgium
3
Microlab, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft 2628, The Netherlands
*
Author to whom correspondence should be addressed.
Academic Editor: Prabir K. Sarker
Received: 7 June 2016 / Revised: 7 July 2016 / Accepted: 2 August 2016 / Published: 9 August 2016

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 29Si 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. View Full-Text
Keywords: alkali–silica reaction; reaction rim; calcium alkali silicate; transport barrier alkali–silica reaction; reaction rim; calcium alkali silicate; transport barrier
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Zheng, K.; Adriaensens, P.; De Schutter, G.; Ye, G.; Taerwe, L. Studies on the Alkali–Silica Reaction Rim in a Simplified Calcium–Alkali–Silicate System. Materials 2016, 9, 670.

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