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.