Review, Sampling, and Evaluation of Landfilled Fly Ash

ABOUT THE INTERNATIONAL CONCRETE ABSTRACTS PORTAL

  • The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

International Concrete Abstracts Portal

  


Title: Review, Sampling, and Evaluation of Landfilled Fly Ash

Author(s): Gopakumar Kaladharan, Asghar Gholizadeh-Vayghan, and Farshad Rajabipour

Publication: Materials Journal

Volume: 116

Issue: 4

Appears on pages(s): 113-122

Keywords: beneficiation; fly ash; landfill; recovered ash; statistical sampling

Date: 7/1/2019

Abstract:
The growing scarcity of high-quality fly ash has urged concrete researchers and practitioners to investigate unconventional sources such as landfilled fly ash. This paper presents a summary of the potential issues with using landfilled fly ash as a concrete pozzolan. To that end, successful characterization of fly ash landfills is crucial to determine the viability of a given landfill as a pozzolan resource. Accordingly, a statistical sampling approach was developed and applied to a Class F fly ash landfill in Pennsylvania. Samples taken from the landfill were tested based on ASTM C618 requirements and statistical analyses were performed to determine the necessary beneficiation strategy. Blended mortar and concrete mixtures incorporating the beneficiated fly ash were tested for slump, plastic and hardened air content, compressive strength, and mitigation of alkali-silica reaction (ASR).