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Open AccessArticle

Thermal Performance of Concrete with Recycled Concrete Powder as Partial Cement Replacement and Recycled CDW Aggregate

1
Department of Construction, School of Engineering, University of Extremadura, UEX-CSIC Partnering Unit, Institute for Sustainable Regional Development (INTERRA), 1003 Cáceres, Spain
2
CERIS, Department of Civil Engineering, Architecture and Georresources, Instituto Superior Técnico (IST), Universidade de Lisboa, 1649-004 Lisbon, Portugal
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(13), 4540; https://doi.org/10.3390/app10134540
Received: 5 June 2020 / Revised: 25 June 2020 / Accepted: 27 June 2020 / Published: 30 June 2020
(This article belongs to the Special Issue Concrete and Mortar with Non-conventional Materials)
This novel study was triggered by a lack in the international literature of the simultaneous use of ground recycled concrete (GRC) as a cement replacement and mixed recycled aggregate as part of the granular skeleton in recycled concrete. It explores the thermal behaviour of concrete mixes bearing 10 wt% or 25 wt% GRC as a cement replacement and 25 wt% or 50 wt% mixed recycled aggregate (MRA) sourced from construction and demolition waste (CDW). The experimental programme conducted assessed concrete’s dry density, open porosity, electrical and thermal conductivity and specific heat capacity. The findings showed that the use of 10% and 25% GRC, in conjunction with 50% MRA, reduced thermal conductivity by 7.9% to 11.8% and raised specific heat capacity by 6.0% to 9.1% relative to concrete with 100% natural aggregate (NA). A cross-property analysis revealed that improved thermal performance was linearly related to lower density and higher porosity. The results also support the conclusion that these new recycled aggregate concrete mixes are more energy-efficient construction materials than conventional concrete. View Full-Text
Keywords: recycled aggregate; ground recycled concrete; recycled materials concrete; construction and demolition waste; thermal properties recycled aggregate; ground recycled concrete; recycled materials concrete; construction and demolition waste; thermal properties
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MDPI and ACS Style

Cantero, B.; Bravo, M.; de Brito, J.; Sáez del Bosque, I.F.; Medina, C. Thermal Performance of Concrete with Recycled Concrete Powder as Partial Cement Replacement and Recycled CDW Aggregate. Appl. Sci. 2020, 10, 4540. https://doi.org/10.3390/app10134540

AMA Style

Cantero B, Bravo M, de Brito J, Sáez del Bosque IF, Medina C. Thermal Performance of Concrete with Recycled Concrete Powder as Partial Cement Replacement and Recycled CDW Aggregate. Applied Sciences. 2020; 10(13):4540. https://doi.org/10.3390/app10134540

Chicago/Turabian Style

Cantero, Blas; Bravo, Miguel; de Brito, Jorge; Sáez del Bosque, Isabel Fuencisla; Medina, César. 2020. "Thermal Performance of Concrete with Recycled Concrete Powder as Partial Cement Replacement and Recycled CDW Aggregate" Appl. Sci. 10, no. 13: 4540. https://doi.org/10.3390/app10134540

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