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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: An Innovative Approach to Fly Ash Characterization and Evaluation to Prevent Alkali-Silica Reaction
Author(s): Anol K. Mukhopadhyay, Kai-Wei Liu, and Mostafa Jalal
Publication: Materials Journal
Appears on pages(s): 173-181
Keywords: accelerated concrete cylinder test (ACCT); advanced characterization; alkali silica reaction (ASR); emerging test methods; fly ash; pozzolans; quantitative X-ray diffraction (QXRD)
Abstract:The main objective of this study was to conduct a full-scale characterization of different types of fly ashes using conventional as well as advanced techniques and evaluating their effectiveness to prevent alkali-silica reaction (ASR) using an emerging accelerated concrete cylinder test (ACCT). The full-scale characterization of fly ashes involves evaluation of type and content of crystalline phases and amorphous content by quantitative X-ray diffraction (QXRD), soluble available alkalis (ASTM C311), and pore solution chemistry along with determination of parameters by the conventional ASTM C618. A favorable comparison between characteristic chemical and mineralogical parameters of the fly ashes and ACCT-based ASR performance prediction was observed. This combined innovative approach was found to be effective to test the effectiveness (optimization) of different types of fly ashes to prevent ASR in a rapid (within 75 days) and reliable manner and formulate case-specific, performance-based, ASR-resistant concrete mixtures using locally available fly ashes.
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