Abstract
Sludge ceramsite recycled concrete (SCRC) is made from sludge ceramsite and recycled fine aggregate (RFA) and is expected to be an eco-efficient lightweight concrete. The SCRC in this study was produced by incorporating sludge ceramsite, RFA and ground granulated blast-furnace slag (GGBS) as a replacement for coarse natural aggregate, natural sand and cement, respectively. An experimental study was conducted to evaluate the surface characteristics, mass loss, failure mode, residual compressive strength and microstructure of the SCRC after exposure to elevated temperatures (25 °C, 200 °C, 400 °C, and 600 °C). In addition, a new hollow block was manufactured with SCRC, and the thermal resistance of the SCRC hollow block was examined. The results showed that the SCRC displayed a good resistance to high temperatures, and its strength retention rate was over 60% after exposure to 600 °C. There was a slight impact from the RFA on the strength retention rate of the SCRC under elevated temperatures. The incorporation of GGBS improved the resistance of SCRC at elevated temperatures. With increasing GGBS content, the residual compressive strength of the SCRC increased first and then decreased, and the suggested optimal GGBS content is 30%. The prepared SCRC hollow block showed excellent thermal insulation performance and exhibited good application prospects in lightweight insulation walls.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
