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Materials 2015, 8(12), 8292-8303; doi:10.3390/ma8125450

Microstructural Changes Due to Alkali-Silica Reaction during Standard Mortar Test

1
Department of Civil and Environmental Engineering, University of Illinois, Urbana, IL 61801, USA
2
Department of Geology, University of Illinois, Urbana, IL 61801, USA
Present Address: Department of Architectural Engineering, Hanyang University, 1271 Sa 3-dong, Sangrok-gu, Ansan, Gyeonggi-do 426-791, Korea
Present Address: College of Natural Science, Michigan State University, East Lansing, MI 48824, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Jorge de Brito
Received: 5 August 2015 / Revised: 16 November 2015 / Accepted: 17 November 2015 / Published: 2 December 2015
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Abstract

The microstructural development of mortar bars with silica glass aggregate undergoing alkali-silica reaction (ASR) under the conditions of American Society for Testing and Materials (ASTM) Standard Test C1260 was analyzed using scanning electron microscopy and qualitative X-ray microanalysis. Cracking in the aggregate, the hydrated paste, and the paste-aggregate interface was important in the development of the microstructure. Cracks were characterized according to their location, their relationship to other cracks, and whether they are filled with ASR gel. Expansion of the bars was approximately 1% at 12 days and 2% at 53 days. They fell apart by 63 days. The bars contained two zones, an inner region that was undergoing ASR and an outer and much more highly damaged zone that extended further inward over time. Evidence of ASR was present even during the period when specimens were immersed in water, prior to immersion in NaOH solution. View Full-Text
Keywords: alkali-silica reaction; backscattered electron imaging; silica glass; ASTM C1260; microcracking; microstructure alkali-silica reaction; backscattered electron imaging; silica glass; ASTM C1260; microcracking; microstructure
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

Shin, J.-H.; Struble, L.J.; Kirkpatrick, R.J. Microstructural Changes Due to Alkali-Silica Reaction during Standard Mortar Test. Materials 2015, 8, 8292-8303.

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