A case study on the applicability of the square-root relationship between compressive and flexural strength of concrete paver blocks

The relationship between compressive strength and flexural strength of concrete is commonly approximated using a square-root model. While this relationship has been widely validated for conventional concrete, limited studies address its applicability to concrete paver blocks. This paper presents a case study evaluating the validity of the square-root relationship for paver blocks using experimental data from three production batches. Compressive and flexural strength tests were conducted on multiple specimens from each batch and average values were analysed. The results indicate that although a general trend exists between flexural strength and the square root of compressive strength, significant variation in proportionality constants is observed across batches. The findings suggest that the conventional assumption is only approximately valid for paver blocks and is influenced by batch-specific production characteristics.