Open AccessEffect of class F fly ash on the durability properties of concrete
Author(s) -
Faiz Uddin Ahmed Shaikh
Publication year - 2018
Publication title -
sustainable environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.061
H-Index - 29
ISSN - 2468-2039
DOI - 10.1016/j.serj.2017.09.001
Subject(s) - fly ash , sorptivity , compressive strength , durability , pozzolanic reaction , materials science , shrinkage , cement , composite material , curing (chemistry) , properties of concrete , portland cement , permeability (electromagnetism) , porosity , ground granulated blast furnace slag , pozzolan , chemistry , biochemistry , membrane
The present study evaluates the application of class F fly ash as a partial replacement of binder in concrete. The compressive strength of the fly ash samples showed low early compressive strength comparing to the control samples. However, due to pozzolanic reaction strength was improved gradually over a longer period of time, whereas control samples stopped the strength growth after 56-d of curing. The drying shrinkage was reduced with the increment of fly ash content in the mix. The inclusion of fly ash as a binder reduced the porosity of the concrete. As a result, the fly ash concrete exhibited lower water sorptivity and chloride permeability. Furthermore, a significant drop of sorptivity and chloride permeability was observed for fly ash concrete between the curing period of 28â180 days. Microstructural morphology of fly ash samples was investigated to evaluate the reason behind the improved durability characteristics. Keywords: Fly ash, Compressive strength, Drying shrinkage, Permeable void, Water sorptivity, Chloride permeabilit