Specimen Geometry Effects on Lightweight Self-Compacting Concrete made with Recycled Aggregates - Research Trend and knowledge Gap Analysis

This paper discusses the influence of specimen size and shape on the performance of Self-Compacting Lightweight Recycled Aggregate Concrete (SCLWRAC), on the mechanical characteristics of the material especially compressive strength. The paper emphasizes that the bigger specimens, particularly those containing a high percentage of recycled aggregate (RA), have lower strengths. It also compares the relationships between Self-Compacting Concrete (SCC), Lightweight Aggregates (LWA) and Recycled Aggregates (RA) with regard to their geometry. The paper has highlighted gaps in the literature, including the unavailability of standardized testing protocols, the necessity of geometry effect correction factors, and long-term durability, including chloride penetration and freeze-thaw resistance, through scientometric analysis of published literature published in 2020 to 2025. The results indicate that more standardized test procedures, better prediction software, and additional studies on the impact of specimen geometry on SCLWRAC performance are required.