Using Recycled Aggregates from Construction and Demolition Waste in Unbound Layers of Pavements

Sajjad Pourkhorshidi, Cesare Sangiorgi, Daniele Torreggiani and Patrizia Tassinari
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Sajjad Pourkhorshidi: Department of Civil, Chemical, Environmental and Materials Engineering (DICAM), University of Bologna, Via Terracini 28, 40131 Bologna, Italy
Cesare Sangiorgi: Department of Civil, Chemical, Environmental and Materials Engineering (DICAM), University of Bologna, Via Terracini 28, 40131 Bologna, Italy
Daniele Torreggiani: Department of Agricultural and Food Sciences (DISTAL), University of Bologna, Viale Fanin 48, 40127 Bologna, Italy
Patrizia Tassinari: Department of Agricultural and Food Sciences (DISTAL), University of Bologna, Viale Fanin 48, 40127 Bologna, Italy

Sustainability, 2020, vol. 12, issue 22, 1-19

Abstract: Pavements are an expensive part of transportation infrastructures, as their construction and maintenance require large amounts of resources and materials every year and all over the world. A sustainable solution for considering environmental concerns about roads and pavements, in general, is utilizing recycled materials for their construction. This has been shown to lower the carbon footprint of the construction sector and to result in natural resource conservation, in reduction of harmful emissions and in minimization of overall costs for pavement construction and maintenance. One of the main groups of recycled materials which has attracted much attention since the end of the last century is construction and demolition waste aggregates (CDW). This paper reviews the completed studies referring to the use of the construction and demolition waste aggregates in unbound layers of pavements and compare the in-hand results from various engineering assessments of these aggregates and mixes. A number of tests and evaluations are applied in order to enhance the required quality and durability of the pavements under given traffic volumes traffic loads and climate actions. Today, unbound recycled aggregates (RA) are mainly used in the lower layers, such as subgrade, capping, sub-base and base, but in rural roads they can be adopted also for bound layers, towards the surface of the structure and may be constituents of bound layers and of novel surfacing applications.

Keywords: recycled materials; construction and demolition; pavements; sustainability; waste (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (8)

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