Durability Assessment of Self-Compacting Concrete Incorporating LECA and Fly Ash Aggregates

https://doi.org/10.46610/JoCCS.2026.v011i02.004

Abstract

To meet the evolving demands of the construction industry, several innovative types of concrete have been developed worldwide. Advanced materials such as chemical admixtures, mineral admixtures, and environmentally friendly binders are increasingly used to enhance the performance of concrete. However, proper compaction and curing remain essential for achieving the desired strength and durability. In this study, cement, fly ash, water, fine aggregate, coarse aggregate, Light Expanded Clay Aggregate (LECA), Fly Ash Aggregate (FAA), and superplasticizer were used to produce Self-Compacting Self-Curing Concrete (SCSCC). Mix proportioning followed EFNARC guidelines. Three series of SCSCC mixes were prepared by replacing fine aggregate with prewetted LECA and FAA at replacement levels ranging from 5% to 25% by volume. A conventional mix without LECA and FAA was used as the control mix. Specimens were cast and cured at room temperature for periods of 3, 7, 28, 56, and 90 days to evaluate their mechanical and durability properties. Results showed that SCSCC mixes exhibited superior durability in terms of sorptivity, rapid chloride permeability (RCPT), corrosion resistance, sulfate resistance, salt resistance, acid resistance, volume change, and abrasion resistance compared to the control mix. The improved performance stemmed from reduced porosity, lower permeability, enhanced microstructure, and self-healing capability. Among all mixes, F15 exhibited the best overall mechanical and durability performance, followed by L15 and F15L5.