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Microstructure of Concrete with Aggregates from Construction and Demolition Waste Recycling Plants

Published online by Cambridge University Press:  23 December 2015

Miguel Bravo ,
António Santos Silva ,
Jorge de Brito  and
Luís Evangelista
Miguel Bravo
Affiliation:
CERis-ICIST, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal
António Santos Silva
Affiliation:
Laboratório Nacional de Engenharia Civil, Av. do Brasil 101, 1700-066 Lisbon, Portugal
Jorge de Brito*
Affiliation:
CERis-ICIST, Department of Civil Engineering, Architecture and Georresources, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal
Luís Evangelista
Affiliation:
CERis-ICIST, Department of Civil Engineering, Instituto Superior de Engenharia de Lisboa, R. Conselheiro Emídio Navarro 1, 1959-001 Lisbon, Portugal
*
*Corresponding author. jb@civil.ist.utl.pt
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Abstract

This paper intends to analyze the microstructure of concrete with recycled aggregates (RA) from construction and demolition waste from various Portuguese recycling plants. To that effect, several scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) analyses were performed. Various concrete mixes were evaluated in order to analyze the influence of the RA’s collection point and consequently of their composition on the mixes’ characteristics. Afterward all the mixes were subjected to the capillary water absorption test in order to quantitatively evaluate their porosity. Results from the SEM/EDS analysis were compared with those from capillary water absorption test. The SEM/EDS analysis showed that the bond capacity of aggregates to the new cement paste is greatly influenced by the RA’s nature. On the other hand, there was an increase in porosity with the incorporation of RA.

Keywords

concreteconstruction and demolition wasterecycled aggregatesITZmicroscopy
Type
Materials Applications
Information
Microscopy and Microanalysis , Volume 22 , Issue 1 , February 2016 , pp. 149 - 167
Copyright
© Microscopy Society of America 2015 

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