Water permeability behavior of recycled lump/aggregate concrete. (14th March 2022)

• Record Type: Journal Article
• Authors: Lin, Lang; Wu, Bo
• Is Part Of: Construction & building materials. Volume 323(2022)
• Publication Date: 2022-03-14
• Subjects: Demolished concrete lumps -- Recycled coarse aggregates -- Sieved Alluvial-Proluvial soil -- Water permeability behavior -- Microstructure analysis; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2022.126508
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Good impermeability and strength can be attained even if waste content reaches 80%. Sieved Alluvial-Proluvial soil hardly influences permeability and strength of RLAC. DCLs have little impact on pore structure of fresh concrete. ITZ between DCL and fresh concrete isn't a weak zone for impermeability. A method is proposed to predict the RLAC's permeability coefficient. 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.