Water-washed fine and coarse recycled aggregates for real scale concretes production in Barcelona

View/Open
Cita com:
hdl:2117/375171
Document typePart of book or chapter of book
Defense date2022
PublisherMultidisciplinary Digital Publishing Institute (MDPI)
Rights accessOpen Access
Except where otherwise noted, content on this work
is licensed under a Creative Commons license
:
Attribution 4.0 International
Abstract
The use of recycled aggregate to reduce the over-exploitation of raw aggregates is necessary. This study analysed and categorised the properties of water-washed, fine and coarse, recycled aggre-gates following European Normalization (EN) specification. Because of their adequate properties, zero impurities and chemical soluble salts, plain recycled concrete was produced using 100% recycled concrete aggregates. Two experimental phases were conducted. Firstly, a laboratory phase, and secondly, an on-site work consisting of a real-scale pavement-base layer. The workability of the produced concretes was validated using two types of admixtures. In addition, the compressive and flexural strength, physical properties, drying shrinkage and depth of penetration of water under pressure validated the concrete design. The authors concluded that the worksite-produced concrete properties were similar to those obtained in the laboratory. Consequently, the laboratory results could be validated for large-scale production. An extended slump value was achieved using 2.5–3% of a multifunctional admixture plus 1–1.2% of superplasticiser in concrete production. In addition, all the produced concretes obtained the required a strength of 20 MPa. Although the pavement-base was produced using 300 kg of cement, the concrete made with 270 kg of cement per m3 and water/cement ratio of 0.53 achieved the best properties with the lowest environmental impact.
CitationEtxeberria, M. [et al.]. Water-washed fine and coarse recycled aggregates for real scale concretes production in Barcelona. A: "Construction and demolition waste: challenges and opportunities". Basel: Multidisciplinary Digital Publishing Institute (MDPI), 2022, p. 19-36.
ISBN978-3-0365-5050-3
Publisher versionhttps://www.mdpi.com/books/book/6003
Files | Description | Size | Format | View |
---|---|---|---|---|
34333715.pdf | 5,849Mb | View/Open |