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Laboratory investigation of the use of volcanic ash in concrete : final report.
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2016-09-01
[PDF-2.92 MB]
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Edition:Final report
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Abstract:Supplementary cementitious materials (SCMs) are commonly used in KDOT concrete pavements and
bridge decks to improve strength and permeability characteristics. The supplementary cementitious materials
allowed under current KDOT specifications are all by-products of industrial processes. Volcanic ash is a
natural product that has been used as a mineral admixture in concrete. The purpose of this study was to
evaluate Kansas sources of volcanic ash for use in concrete as an SCM. This report will discuss all three
stages of the study: material testing of the volcanic ash, testing the cementitious properties of Kansas
volcanic ash, and evaluating the effects of volcanic ash on the properties of concrete such as strength and
permeability.
Based on the results and the subsequent analysis, it has been determined that Kansas sources of
volcanic ash are not suitable for use as SCMs in concrete. Testing indicated that Kansas volcanic ash has few
cementitious properties and as a result, when added to concrete, it has several possible negative effects,
including increased bleed, increased set time, negative effect on strength, permeability, and finishing. The
few benefits that the use of volcanic ash may provide (controlling alkali–silica reaction [ASR] and reducing
shrinkage, although more testing would be necessary to completely determine the validity and extent of those
benefits) are not significant enough to overcome the detrimental effects of the volcanic ash.
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