Self-compacting lightweight aggregate concrete and its properties: A review

This paper comprehensively analyses different properties of lightweight aggregates (LWA) based on selfcompacting concrete (SCC). The construction sector has acknowledged the value of limited natural resources, such as fine and coarse aggregates widely used to create SCC and NVC (normal vibrating concrete). In addition, the management and disposal of by-products have become a major global concern. In the past few decades, intensive use of alternative materials such as LWA in SCC production has been undertaken. Including these byproducts as LWA (either coarse or fine) not only leads to the sustainable development of SCC but also benefits the environment. Most studies on using LWA support using it as a green material in concrete production. The current investigation highlights light-expanded clay aggregates, diatomite aggregates, walnut shells, palm shells, rice husk ash, micro silica, pumice stone, and scoria aggregate as LWA in the successful development of green and sustainable SCC. This paper summarizes the tests conducted on the fresh, mechanical, and durability properties of LWA-based SCC. The analysis concludes that incorporating LWA in SCC can be recommended for usage in the construction sector due to improved/equivalent performance compared to the control SCC. Based on the available literature, a critical analysis has been conducted, and the future area of work has also been discussed. In addition, this review aims to provide substantial knowledge and challenges associated with the potential use of LWA in SCC to promote cleaner production and sustainability in the construction industry.