Abstract
A combined test device was developed to investigate the effect of microcracks on rapid chloride ion diffusion in mortar with recycled fine aggregate under uniaxial compression loading. Deformation and microcrack growth were statistically evaluated using the digital image correlation (DIC) method. The chloride ion distribution and porosity in mortar with different proportions of natural and recycled fine aggregates were investigated by micro X-ray fluorescence (μXRF) and mercury intrusion porosimetry (MIP), respectively. Chloride ion transportation was affected by pore structure and natural fine aggregate content. The diffusion coefficient decreased and then increased with increasing compression load and reached the minimum at stress of 0.4 fc-0.5 fc. A statistical specific crack area method based on DIC is proposed for the first time, based on which the chloride diffusion coefficient in mortar with recycled fine aggregate can be predicted.
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