Abstract
The use of recycled coarse aggregate (RCA) is limited due to the presence of attached mortar (AM), which affects its performance. To overcome this limitation, traditional methods such as mechanical and chemical techniques have been used to remove AM from RCA and obtain natural aggregate (NA). Freeze-thaw cycles (FTC) processing has shown high efficiency in removing AM while causing negligible damage to the NA. This paper aims to investigate the impact of thermo-drying (TD) on the FTC processing quantitatively. The experimental data, ranging from micro- to macro-scale, was used to reveal the mechanism behind the process. To further analyze the impact of TD, a theoretical model was established to calculate the strain distribution of AM during FTC processing while taking into account the influence of TD. The findings suggest that TD has a positive impact on FTC processing. However, an integrated analysis is necessary to balance processing efficiency and energy consumption. This analysis will allow for the development of an optimized TD-FTC processing scheme.
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