Performance based testing for air entrainment and total heat of reclaimed fly ash

Abstract

As coal combustion energy plants are being converted to natural gas, the tons of fly ash produced in the United States has dramatically decreased. The current demand in fly ash supply can be mitigated with the introduction of reclaimed fly ash. The objective of this paper is to develop performance-based testing for traditional, blended, and reclaimed Class F fly ash. Research and test results from laboratories will provide information to compare the change in performance of different fly ash materials at either 20% or 40% replacement in comparison to cement. This work investigated the ability of the foam index test to predict the AEA dosage in concrete mixtures containing fly ash and investigated the use of isothermal calorimetry to provide the availability for rapid testing to compare the impact of the heat of hydration with reclaimed, blended, and traditional Class F ash.