Processing disaster debris liberating aggregates for structural concrete

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Abstract

Worldwide, the removal of debris and reconstruction is requested when natural
disasters and conflicts cause damaged or collapsed buildings. The on-site recycling of concrete waste into new structural concrete decreases transport and production energy costs, reduces the utilization of raw materials, and saves the use of limited landfill space. The application of recycled concrete aggregates (RCA) in structural concrete is currently limited, since concrete recycling involves application as road base material or in non-structural concrete with low strength requirements. Applying an optimised crushing method could improve the applicability of RCA in structural concrete. The quality of the initial concrete investigated is unknown, and embedded defects influence the quality of the final concrete made with RCA. Separating the hardened cement paste (HCP) from the aggregates through optimised crushing minimises the influence of the initial concrete on the quality of concrete made with RCA. In turn, the HCP can be extracted, reducing water absorption and minimising workability problems. Through this, optimised crushing makes the application of recycled concrete into new concrete far less troublesome, and therefore widely applicable and highly suitable for post disaster areas.
This study primarily looks into the influence of the optimised crushing process on the resulting particles of the produced RCA. For this, concrete demolition waste is passed through the optimised crusher three times. An initial visual assessment of the RCA produced is made and the specific aggregated density measured shows promising results regarding aggregate quality.
Original languageEnglish
Title of host publicationAdvances in Cement and Concrete Technology in Africa
Subtitle of host publicationProceedings 2nd International Conference, Dar es Salaam, Tanzania, January 27 -29 2016
EditorsW. Schmidt, N.S. Msinjili
Place of PublicationBerlin
PublisherBAM Federal Institute for Materials Research and Testing
Pages603-610
Number of pages8
ISBN (Electronic)978-3-9817502-3-2
Publication statusPublished - 27 Jan 2016
Event2nd International Conference on Advances in Cement and Concrete Technology in Africa (ACCTA 2016), January 27-29, 2016, Dar es Salaam, Tanzania - White Sands Hotel, Dar es Salaam, Tanzania, United Republic of
Duration: 27 Jan 201629 Jan 2016
http://www.accta2016.bam.de/en/home/index.htm

Conference

Conference2nd International Conference on Advances in Cement and Concrete Technology in Africa (ACCTA 2016), January 27-29, 2016, Dar es Salaam, Tanzania
Abbreviated titleACCTA 2016
CountryTanzania, United Republic of
CityDar es Salaam
Period27/01/1629/01/16
Internet address

Keywords

  • Disaster Recovery
  • Construction and Demolition Waste
  • Recycled Concrete Aggregates
  • Specific Density
  • Particle Size Distribution
  • Optimised Crushing

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