title: Use of recycled aggregates from construction and demolition waste in geotechnical applications: A literature review.
abstract: The use of recycled aggregates (RA) in construction constitutes a significant step towards a more sustainable society and also creates a new market opportunity to be exploited. In recent years, several case-studies have emerged in which RA were used in Geotechnical applications, such as filling materials and in unbound pavement layers. This paper presents a review of the most important physical properties of different types of RA and their comparison with natural aggregates (NA), and how these properties affect their hydraulic and mechanical behaviour when compacted. Specifically, the effects of compaction on grading size distribution curves and density are analysed, as well as the consequences of particle crushing on the resilient modulus, CBR and permeability. The paper also contains an analysis of the influence of incorporating different RA types on the performance of unbound road pavement layers as compared with those built with NA by means of the International Roughness Index and deflection values. The results collected from the literature indicate that the performance of most RA is comparable to that of NA and can be used in unbound pavement layers or in other applications requiring compaction.
authors.affiliation: ICIST, CERIS, Department of Civil Engineering, Architecture and Georresources, Instituto Superior Técnico, University of Lisbon, Av. Rovisco Pais, 1, 1049-001 Lisbon, Portugal. Electronic address: rafaela@civil.ist.utl.pt.
authors.forename: Rafaela
authors.initials: R
authors.lastname: Cardoso
authors.affiliation: ICIST, CERIS, Department of Civil Engineering, Architecture and Georresources, Instituto Superior Técnico, University of Lisbon, Av. Rovisco Pais, 1, 1049-001 Lisbon, Portugal.
authors.forename: Rui Vasco
authors.initials: RV
authors.lastname: Silva
authors.affiliation: ICIST, CERIS, Department of Civil Engineering, Architecture and Georresources, Instituto Superior Técnico, University of Lisbon, Av. Rovisco Pais, 1, 1049-001 Lisbon, Portugal.
authors.forename: Jorge de
authors.initials: J
authors.lastname: Brito
authors.affiliation: School of Civil Engineering, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK; Applying Concrete Knowledge, 1A Blakeney Avenue, Birmingham B17 8AP, UK.
authors.forename: Ravindra
authors.initials: R
authors.lastname: Dhir
mesh_terms: D003252:Construction Materials; D005615:Freezing; D010539:Permeability; D011786:Quality Control; D059027:Recycling; D018505:Waste Management / Q000379:methods*
keywords: Compacted materials; Pavement layers; RAP; RCA; RMA; Recycled aggregates