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Evaluating the Effectiveness of Fly Ashes to Mitigate ASR and Using Recycled Concrete Aggregate as an Aggregate Source

Project Details
STATE

WY

SOURCE

ROSA P

START DATE

11/14/14

END DATE

01/01/18

RESEARCHERS

Bryce Fiore, Md Tarik Hossain, Margaret Kimble, Fayez AlMutawa, Jennifer Eisenhauer Tanner

SPONSORS

Wyoming DOT

KEYWORDS

aggregate, Alkali silica reaction, Concrete, Durability, Expansion, Wyoming

LINKS

Product

Project description

A comprehensive study was performed to evaluate mitigation options to reduce premature expansion due to alkali-silica reaction (ASR) for selected Wyoming aggregates. State-of-the-art and standardized test methods were performed and results were used to compare expansion levels. Four different fly-ash sources were tested. All of the sources mitigated the moderately reactive aggregates; the most highly expansive aggregate was mitigated by two out of the four fly ash sources. An exploratory test, the Autoclave Concrete Prism Test (ACPT) was evaluated by comparing results with the University of Wyoming and the University of Alabama. Test data shows agreement between two independent laboratories.
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