Performance and prediction of non-traditional coal-ash in concrete with the Particle Model

Abstract

The demand for non-traditional coal ash (NTCA) such as ponded ash, landfilled ash, ground bottom ash, and blended ash in concrete is increasing because of the reduction of the total production of traditional fly ash in the US. In this work, 11 different NTCA sources are used for concrete mixtures. The compressive strength and surface resistivity of NTCA concrete is measured at 7 different times of hydration between 3d and 180d at 20% and 40% replacement levels. This study shows that NTCA shows similar properties and performance to traditional fly ash. Next, a predictive model for compressive strength and resistivity based on traditional fly ash is used to predict the performance of NTCA concrete. The developed predictive models for traditional fly ash show promise for predicting the compressive strength of NCTA fly ash at 20% and 40% replacement but surface resistivity models need improvement.