Journal Published Online: 21 September 2022
Volume 11, Issue 2

Reactivity Evaluation of Harvested Class C Fly Ash

CODEN: ACEMF9

Abstract

Unused Class C fly ash has been disposed of in large impoundments or landfills for many decades. Reclamation and use of this material in concrete could provide a solution to environmental challenges and alleviate shortages of fresh fly ash in some locations. This research study investigated beneficiation and the use of harvested Class C fly ash as a supplementary cementitious material (SCM) at different replacement percentages of portland cement. The reactivities of three different sources of harvested Class C fly ash were evaluated with different amounts of grinding at low and high temperature curing. Isothermal calorimetry, the R3 method, strength activity index, the modified lime-pozzolan strength test, thermogravimetric analysis, and quantitative x-ray diffraction were used to analyze the physicochemical, mineralogical, and hydration kinetics properties of the harvested ashes. While harvested Class C fly ash showed great potential for use in concrete as an SCM, limits on loss on ignition may be helpful in limiting the calcium carbonate content and giving good performance at temperatures higher than laboratory temperatures.

Author Information

Alaibani, Anfal
Civil and Coastal Engineering, Engineering School of Sustainable Infrastructure & Environment, University of Florida, Gainesville, FL, USA
Riding, Kyle A.
Civil and Coastal Engineering, Engineering School of Sustainable Infrastructure & Environment, University of Florida, Gainesville, FL, USA
Pages: 22
Price: $25.00
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Stock #: ACEM20210161
ISSN: 2379-1357
DOI: 10.1520/ACEM20210161