Experimental Study of Aggregates Size Effect on Strain, Damage and Permeability of Concrete
Two approaches can be used to study the size effect: one based on the change in sample size, and the other based on the variation in the aggregates size. The main objective of this research was to study the second approach. We studied 6 various concrete mixes and each test was repeated three times. For each material, uniaxial cyclic compressive tests have been performed to investigate the behaviour of concrete in a partially damaged state. The specimens were submitted to three levels of loading corresponding to 30, 60 and 80% of the maximal compressive strength. The damage indicator chosen is the decrease of Young’s modulus and the tightness indicator is the gas permeability. Results show that the concrete composition and more particularly the aggregate size have an important influence on the mechanical and transfer properties of concretes.
A. Fabien et al., "Experimental Study of Aggregates Size Effect on Strain, Damage and Permeability of Concrete", Key Engineering Materials, Vol. 729, pp. 115-121, 2017