Impacts of Fly Ash on Time-Dependent Properties of Agro-Waste Lightweight Aggregate Concrete
Date
2021
Authors
Maghfouri, Mehdi
Alimohammadi, Vahid
Azarsa, Pejman
Asadi, Iman
Doroudi, Yashar
Balakrishnan, Balamohan
Journal Title
Journal ISSN
Volume Title
Publisher
Journal of Composites Science
Abstract
The utilization of by-products and waste materials to substitute for the natural or manufactured
resources is considered as a practical way to obtain green building materials. In concrete
mixtures, amongst the many available options, Fly Ash (FA) as a by-product pozzolan has been used
as a partial replacement of cement. As for the aggregates, lightweight agro-waste oil palm shell (OPS)
can be used as a replacement to conventional aggregate for the production of lightweight aggregate
concrete. The present communication aims to investigate the impact of FA on time-dependent
development properties of OPS lightweight aggregate concrete, including density, water absorption,
compressive strength up to 120-days, and drying shrinkage up to the age of 365-days under standard
moist curing, partially early curing, and non-curing conditions. Additionally, drying shrinkage
crack development was investigated. In this study, two series of concrete mixtures with different
substitution levels of OPS (0%, 50%, and 100%) and FA were tested. From the obtained results, it
was concluded that the incorporation of fly ash in OPS concrete reduces the density and compressive
strength values. Dually, the initial and final water absorption values plus the rate of drying shrinkage
at early and long-term ages increased. On top of that, a high potential of drying shrinkage crack,
especially for mixtures with 100% OPS, was identified.
Description
Keywords
fly ash, oil palm shell, lightweight concrete, compressive strength, drying shrinkage, crack development
Citation
Maghfouri, M., Alimohammadi, V., Azarsa, P., Asadi, I., Doroudi, Y., & Balakrishnan, B. (2021). Impact of Fly Ash on Time-Dependent Properties of Agro-Waste Lightweight Aggregate Concrete. Journal of Composites Science, 5(6), 1-23. https://doi.org/10.3390/jcs5060156.