Title: Harvested Fly Ash for Supplementary Cementitious Materials

Author(s): Nader Ghafoori, Ariful Hasnat, and Aderemi Gbadamosi

Publication: Symposium Paper

Volume: 362

Issue:

Appears on pages(s): 941-952

Keywords: absorption, fly ash, harvested, tr aditional, resistivity, shrinkage, strength

DOI: 10.14359/51742020

Date: 6/18/2024

Abstract:
This paper examines the influence of harvested fly ash on the properties of mortar and concrete. Class F and harvested fly ash were used at the substitution rate of 20% by weight of Portland cement. The investigated properties included heat release, consistency, setting time, compressive strength at different testing ages, absorption, the volume of permeable voids, surface resistivity, and drying shrinkage. The results revealed that the harvested fly ash produced the lowest released heat of hydration and longest setting times. Mixtures containing harvested fly ash displayed lower strength at all curing ages. Compared to traditional fly ash, harvested fly ash showed inferior transport properties for both absorption rate, permeable voids, and surface resistivity. Mixtures containing harvested fly ash showed comparable 120-day drying shrinkage when compared with the companion mortars made with traditional fly ash.