Print Email Facebook Twitter Elastic modulus of the alkali-silica reaction rim in a simplified calcium-alkali-silicate system determined by nano-indentation Title Elastic modulus of the alkali-silica reaction rim in a simplified calcium-alkali-silicate system determined by nano-indentation Author Zheng, Kunpeng (Universiteit Gent) Lukovic, M. (TU Delft Steel & Composite Structures) de Schutter, Geert (Universiteit Gent) Ye, G. (TU Delft Materials and Environment; Magnel Laboratory for Concrete Research; Universiteit Gent) Taerwe, Luc (Universiteit Gent) Date 2016-09-01 Abstract This work aims at providing a better understanding of the mechanical properties of the reaction rim in the alkali-silica reaction. The elastic modulus of the calcium alkali silicate constituting the reaction rim, which is formed at the interface between alkali silicate and Ca(OH)2 in a chemically-idealized system of the alkali-silica reaction, was studied using nano-indentation. In addition, the corresponding calcium to silica mole ratio of the calcium alkali silicate was investigated. The results show that the elastic modulus of the calcium alkali silicate formed at the interface increased with the increase of the calcium to silica mole ratio and vice versa. Furthermore, the more calcium that was available for interaction with alkali silicate to form calcium alkali silicate, the higher the calcium to silica mole ratio and, consequently, the higher the elastic modulus of the formed calcium alkali silicate. This work provides illustrative evidence from a mechanical point of view on how the occurrence of cracks due to the alkali-silica reaction (ASR) is linked to the formation of the reaction rim. It has to be highlighted, however, that the simplified calcium-alkali-silicate system in this study is far from the real condition in concrete. Subject Alkali-silica reactionCalcium alkali silicateElastic modulusReaction rim To reference this document use: http://resolver.tudelft.nl/uuid:d1470dc8-261b-4baf-abad-1c62be967b0d DOI https://doi.org/10.3390/ma9090787 ISSN 1996-1944 Source Materials, 9 (9), 1-17 Part of collection Institutional Repository Document type journal article Rights © 2016 Kunpeng Zheng, M. Lukovic, Geert de Schutter, G. Ye, Luc Taerwe Files PDF materials_09_00787.pdf 6.24 MB Close viewer /islandora/object/uuid:d1470dc8-261b-4baf-abad-1c62be967b0d/datastream/OBJ/view