Evaluation and comparison of the compressive stress-strain relationships of self-compacting concrete and conventional concrete

Self-compacting concrete (SCC) is considered as a concrete which can be placed and compacted under its own weight with little or no compaction. Whereas it is while being cohesive enough to be handled without segregation or bleeding at the same time. It is used to facilitate and ensure proper filling of the complex and multipart formworks and good structural performance in the heavily reinforced structural members. Modification in the mix design of SCC may have a significant influence on the materialâs mechanical properties. Therefore, it is important to investigate that whether all of the assumed hypotheses for conventional concrete (CC) to design the structures are also valid for SCC construction. The stress-strain curve represents the deformation and strength characteristics and it is an important material behaviour of the concrete. However, due to various influencing factors and the differences between SCC and CC, the proposed curves differ. Hence, it is necessary to study the stress-strain relationship of SCC with its special material composition. This paper reviews the accuracy of the well known stress-strain relationships under uniaxial compression including: Hognestad (8), Smith and Young (9), Desayi and Krishnan (10), Saenz (11), Collins and Mitchell (12) and Mazars and Pijaudier-Cabot (13) that have been developed based on the CC experimental results and are compared with the SCC stress-strain curves experimental results for uniaxial compression available in the literature.