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

Shin, Jun-Ho; Struble, Leslie; Kirkpatrick, R.

doi:10.3390/ma8125450

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

Journal Article · Tue Dec 01 00:00:00 EST 2015 · Materials

DOI:https://doi.org/10.3390/ma8125450· OSTI ID:1240599

Shin, Jun-Ho ^[1]; Struble, Leslie ^[1]; Kirkpatrick, R. ^[1]

Univ. of Illinois, Urbana, IL (United States)

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.

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Research Organization:: Univ. of Illinois at Urbana-Champaign, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-07ER46453

OSTI ID:: 1240599

Journal Information:: Materials, Vol. 8, Issue 12; ISSN 1996-1944

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 14 works

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References (16)

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

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