Abstract
Water permeability behavior of recycled lump/aggregate concrete (RLAC), which simultaneously contains demolished concrete lumps (DCLs), recycled coarse aggregates and sieved Alluvial-Proluvial (A-P) soil, were experimentally investigated. Scanning electron microscope and mercury intrusion porosimetry were conducted to explain the macroscopic test results. The results showed that: (a) the RLAC’s impermeability grade was not less than P8, even when the waste content in the RLAC reached about 80%; (b) the DCLs deteriorated the RLAC’s impermeability when the source concrete of DCLs showed poorer impermeability; (c) the sieved A-P soil hardly influenced the RLAC’s permeability; (d) the interfacial transition zone between the fresh concrete and DCLs was not a weak zone for the impermeability of RLAC; and (e) the DCLs had little influence on the pore structure of the surrounding fresh concrete. A method was proposed to predict the RLAC’s permeability coefficient.
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