Splitting tensile strength and modulus of elasticity of self-compacting concrete

摘要

In this experimental work, the splitting tensile strength and the modulus of elasticity are studied for self-compacting concretes of different ages. At the same time, its porous structure is analysed, since this aspect is directly related with mechanical properties of the material. Eight different concretes were used, four self-compacting and four normally-vibrated, with different water/cement ratios and different types of cement. The results obtained show that in self-compacting concretes made with limestone filler the splitting tensile strength is on average 15% less than that of normally-vibrated concretes. It is therefore suggested that the standard expressions that are normally used for normally-vibrated concretes should be modified for these concretes. In addition, it is seen that the cementitious paste's modulus of elasticity is greater in the self-compacting concretes because the addition of limestone fines creates lower porosity and a finer microstructure. Despite this, the concrete's modulus of elasticity tends to be around 2% less in the self-compacting concretes as a result of the greater amount of cement paste in the self-compacting concretes.