Durability and shrinkage of concrete with CDW as recycled aggregates: Benefits from superplasticizer’s incorporation and influence of CDW composition M. Bravo a , J. de Brito b,⇑ , L. Evangelista c , J. Pacheco b a CERIS-ICIST, Department of Civil Engineering, Barreiro School of Technology, Polytechnic Institute of Setúbal, Rua Américo da Silva Marinho, Lavradio, Portugal b CERIS-ICIST, Department of Civil Engineering, Architecture and Georresources, Instituto Superior Técnico – Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal c CERIS-ISEL, Department of Civil Engineering, Instituto Superior de Engenharia de Lisboa, Rua Conselheiro Emídio Navarro, 1, 1959-007 Lisbon, Portugal highlights  Superplasticizers as a means to produce durable recycled aggregates concrete.  Effect of recycled aggregates composition and incorporation ratio on concrete.  Comparison of concrete with and without superplasticizer.  Recycled aggregate characteristics limit the efficiency of superplasticizers.  Superplasticizers improve durability except when chloride ingress is a concern. article info Article history: Received 14 October 2017 Received in revised form 20 February 2018 Accepted 22 February 2018 Keywords: Recycled aggregates Construction and demolition waste Water absorption Carbonation Chloride ingress Shrinkage Eco-efficient concrete abstract The shrinkage and durability properties of a total of 34 concrete mixes with recycled aggregates produced from different untreated construction and demolition waste (CDW) were tested. The effect of a polycar- boxylic superplasticizer on the enhancement of these properties is presented, discussed, and compared with the findings of studies on concrete whose recycled aggregates are sourced from concrete. All prop- erties were significantly affected by recycled aggregate incorporation and this effect was strongly depen- dent on the properties of the recycled aggregates of each specific source. The superplasticizer was less efficient in mixes with CDW than when the recycled aggregates were produced from concrete, the most common source of recycled aggregates in experimental works, despite untreated CDW being more prac- tical and desirable from an industrial and environmental perspective. Ó 2018 Elsevier Ltd. All rights reserved. 1. Introduction The use of recycled aggregates (RA) in concrete is an eco- efficient option that reduces the extraction of natural resources and the waste produced by the construction industry. However, since RA are different from natural aggregates (NA), recycled aggregate concrete (RAC) and natural aggregate concrete (NAC) also differ in their material, mechanical, and durability properties. RA differ from NA in several aspects related to their composition and physical properties. The most relevant differences are their shape and water absorption – both are dependent on the RA’s source and production process [1]. These two factors combined lead to higher RAC porosity in comparison to NAC since: https://doi.org/10.1016/j.conbuildmat.2018.02.176 0950-0618/Ó 2018 Elsevier Ltd. All rights reserved. Abbreviations: CDW, construction and demolition waste; CRA, coarse recycle aggregate; CRAC, coarse recycled aggregate concrete; FRA, fine recycled aggregate; FRAC, fine recycled aggregate concrete; ITZ, interfacial transition zone; NA, natural aggregate; NAC, natural aggregate concrete; RA, recycled aggregate; RAC, recycled aggregate concrete; RCA, recycled concrete aggregate; SP, superplasticizer. ⇑ Corresponding author. E-mail addresses: jb@civil.ist.utl.pt (J. de Brito), evangelista@dec.isel.ipl.pt (L. Evangelista), joaonpacheco@ist.utl.pt (J. Pacheco). Construction and Building Materials 168 (2018) 818–830 Contents lists available at ScienceDirect Construction and Building Materials journal homepage: www.elsevier.com/locate/conbuildmat