Document Type : Research Article
Shahid Beheshti University, Tehran, Iran.
School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran.
The present study's focus is to investigate the influence of loading micro-cracks on the transport properties of self-consolidating concrete (SCC). To have concrete mixtures with distinctly different fracture properties and diffuse damage behaviors, three SCCs were prepared: two SCCs with two different types of aggregates (limestone and siliceous) and one containing steel fibers. The loading micro-cracks were done on the specimens via the application of uniaxial compression up to 70% of the ultimate compressive strength (UCS) with different loading times to propagate damage within mixtures. Accelerated carbonation was applied to undamaged and damaged specimens with a concentration of CO2 of 20% at 20±5°C and humidity at 70±5% in the carbonation chamber to evaluate the transport properties of SCC. The chloride resistance of the SCC was measured using an accelerated chloride migration test. Based on the results, it was concluded that the transport properties in concrete are highly affected by sustained loading time. The SCC-containing steel fibers showed good resistance against diffusion of chloride ions and CO2 gas for two damaged and undamaged state conditions. Also, a correlation was obtained between the intrinsic permeability coefficient and chloride diffusion coefficient in the damaged and undamaged state for each SCC and also between mechanical damages and durability parameters.