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Roles of enhanced ITZ in improving the mechanical properties of concrete prepared with different types of recycled aggregates

Recycled aggregates (RAs) derived from construction and demolition (C&D) waste usually contain several types of aggregates (e.g. recycled concrete aggregate (RCA), recycled concrete block aggregate (RCBA), and recycled red brick aggregate (RBA)). The physical properties of these RAs with diverse...

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Main Authors: Liu, Yi, Ren, Pengfei, Garcia-Troncoso, Natividad, Mo, Kim Hung, Ling, Tung-Chai
Format: Article
Published: Elsevier 2022
Subjects:
TA Engineering (General). Civil engineering (General)
Online Access:http://eprints.um.edu.my/41114/
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spelling my.um.eprints.411142023-09-06T07:35:45Z http://eprints.um.edu.my/41114/ Roles of enhanced ITZ in improving the mechanical properties of concrete prepared with different types of recycled aggregates Liu, Yi Ren, Pengfei Garcia-Troncoso, Natividad Mo, Kim Hung Ling, Tung-Chai TA Engineering (General). Civil engineering (General) Recycled aggregates (RAs) derived from construction and demolition (C&D) waste usually contain several types of aggregates (e.g. recycled concrete aggregate (RCA), recycled concrete block aggregate (RCBA), and recycled red brick aggregate (RBA)). The physical properties of these RAs with diverse intrinsic strength and water absorption could affect the interfacial transition zone (ITZ) and mechanical properties of a new concrete differently. This paper aims to study the compressive strength and tensile bond strength of concrete made with full natural aggregate (NA) substitute by RCA, RCBA and RBA. Microhardness testing and scanning electron microscope-backscattered electron (SEM-BSE) image analysis were used to elucidate the microstructural performance within the ITZ and its underlying mechanism. Experimental results showed that both RCA and RCBA concrete had a higher compressive strength than NA concrete despite the weaker intrinsic RAs properties. In terms of tensile bond strength, all RAs concretes exhibited better tensile bond strength (5-49%) than NA concrete. It appears that the beneficial effect of enhanced ITZ outweighed the intrinsic properties of the RAs with regards to the concrete performance. This was further confirmed by the microhardness and BSE results as all concretes with the RAs exhibited higher microhardness value and lower porosity than NA concrete. Elsevier 2022-11 Article PeerReviewed Liu, Yi and Ren, Pengfei and Garcia-Troncoso, Natividad and Mo, Kim Hung and Ling, Tung-Chai (2022) Roles of enhanced ITZ in improving the mechanical properties of concrete prepared with different types of recycled aggregates. Journal of Building Engineering, 60. ISSN 2352-7102, DOI https://doi.org/10.1016/j.jobe.2022.105197 <https://doi.org/10.1016/j.jobe.2022.105197>. 10.1016/j.jobe.2022.105197
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
topic TA Engineering (General). Civil engineering (General)
spellingShingle TA Engineering (General). Civil engineering (General)
Liu, Yi
Ren, Pengfei
Garcia-Troncoso, Natividad
Mo, Kim Hung
Ling, Tung-Chai
Roles of enhanced ITZ in improving the mechanical properties of concrete prepared with different types of recycled aggregates
description Recycled aggregates (RAs) derived from construction and demolition (C&D) waste usually contain several types of aggregates (e.g. recycled concrete aggregate (RCA), recycled concrete block aggregate (RCBA), and recycled red brick aggregate (RBA)). The physical properties of these RAs with diverse intrinsic strength and water absorption could affect the interfacial transition zone (ITZ) and mechanical properties of a new concrete differently. This paper aims to study the compressive strength and tensile bond strength of concrete made with full natural aggregate (NA) substitute by RCA, RCBA and RBA. Microhardness testing and scanning electron microscope-backscattered electron (SEM-BSE) image analysis were used to elucidate the microstructural performance within the ITZ and its underlying mechanism. Experimental results showed that both RCA and RCBA concrete had a higher compressive strength than NA concrete despite the weaker intrinsic RAs properties. In terms of tensile bond strength, all RAs concretes exhibited better tensile bond strength (5-49%) than NA concrete. It appears that the beneficial effect of enhanced ITZ outweighed the intrinsic properties of the RAs with regards to the concrete performance. This was further confirmed by the microhardness and BSE results as all concretes with the RAs exhibited higher microhardness value and lower porosity than NA concrete.
format Article
author Liu, Yi
Ren, Pengfei
Garcia-Troncoso, Natividad
Mo, Kim Hung
Ling, Tung-Chai
author_facet Liu, Yi
Ren, Pengfei
Garcia-Troncoso, Natividad
Mo, Kim Hung
Ling, Tung-Chai
author_sort Liu, Yi
title Roles of enhanced ITZ in improving the mechanical properties of concrete prepared with different types of recycled aggregates
title_short Roles of enhanced ITZ in improving the mechanical properties of concrete prepared with different types of recycled aggregates
title_full Roles of enhanced ITZ in improving the mechanical properties of concrete prepared with different types of recycled aggregates
title_fullStr Roles of enhanced ITZ in improving the mechanical properties of concrete prepared with different types of recycled aggregates
title_full_unstemmed Roles of enhanced ITZ in improving the mechanical properties of concrete prepared with different types of recycled aggregates
title_sort roles of enhanced itz in improving the mechanical properties of concrete prepared with different types of recycled aggregates
publisher Elsevier
publishDate 2022
url http://eprints.um.edu.my/41114/
_version_ 1778161627706687488
score 13.211869

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