Microstructure and mechanical properties of concrete with treated recycled concrete aggregates

Recycled concrete aggregates (RCA) are sourced from construction demolitions. Weaker concrete, however, often resulted when using RCA as partial or full replacement of coarse aggregates due to old mortar in RCA. Several treatment methods target this old mortar to completely remove it, or enhance its...

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Main Authors: Tang, Anthony John, De Jesus, Richard, Cunanan, Alvin
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Published: Animo Repository 2019
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Online Access:https://animorepository.dlsu.edu.ph/faculty_research/4315
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Institution: De La Salle University
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spelling oai:animorepository.dlsu.edu.ph:faculty_research-52242021-12-10T01:38:05Z Microstructure and mechanical properties of concrete with treated recycled concrete aggregates Tang, Anthony John De Jesus, Richard Cunanan, Alvin Recycled concrete aggregates (RCA) are sourced from construction demolitions. Weaker concrete, however, often resulted when using RCA as partial or full replacement of coarse aggregates due to old mortar in RCA. Several treatment methods target this old mortar to completely remove it, or enhance its properties, to make RCA suitable for construction use. Three treatment methods were employed in this study: (1) sulfuric acid (SA), (2) silica fume impregnation (SF), and (3) the combination of both sulfuric acid and silica fume (SASF). Experimental investigation showed improvement in the physical properties of RCA compared to untreated RCA, however, statistical tests showed that these improvements were not significant. SA treatment was found to have a detrimental effect on the surface of RCA, which developed a weaker layer of adhered mortar on the RCA surface resulting to a reduction in the mechanical strength of the concrete thus, its strength is lower compared to concrete with SF-treated RCA. SF treatment resulted in improved compressive strength in comparison to untreated RCA concrete, SA-treated RCA concrete, and SASF-treated RCA concrete. It was also observed that 50% RCA replacement in all concrete mixes with treated RCA resulted to highest obtained compressive strength. © Int. J. of GEOMATE. 2019-01-01T08:00:00Z text https://animorepository.dlsu.edu.ph/faculty_research/4315 info:doi/10.21660/2019.57.4537 Faculty Research Work Animo Repository Aggregates (Building materials) Waste products as building materials Civil Engineering
institution De La Salle University
building De La Salle University Library
continent Asia
country Philippines
Philippines
content_provider De La Salle University Library
collection DLSU Institutional Repository
topic Aggregates (Building materials)
Waste products as building materials
Civil Engineering
spellingShingle Aggregates (Building materials)
Waste products as building materials
Civil Engineering
Tang, Anthony John
De Jesus, Richard
Cunanan, Alvin
Microstructure and mechanical properties of concrete with treated recycled concrete aggregates
description Recycled concrete aggregates (RCA) are sourced from construction demolitions. Weaker concrete, however, often resulted when using RCA as partial or full replacement of coarse aggregates due to old mortar in RCA. Several treatment methods target this old mortar to completely remove it, or enhance its properties, to make RCA suitable for construction use. Three treatment methods were employed in this study: (1) sulfuric acid (SA), (2) silica fume impregnation (SF), and (3) the combination of both sulfuric acid and silica fume (SASF). Experimental investigation showed improvement in the physical properties of RCA compared to untreated RCA, however, statistical tests showed that these improvements were not significant. SA treatment was found to have a detrimental effect on the surface of RCA, which developed a weaker layer of adhered mortar on the RCA surface resulting to a reduction in the mechanical strength of the concrete thus, its strength is lower compared to concrete with SF-treated RCA. SF treatment resulted in improved compressive strength in comparison to untreated RCA concrete, SA-treated RCA concrete, and SASF-treated RCA concrete. It was also observed that 50% RCA replacement in all concrete mixes with treated RCA resulted to highest obtained compressive strength. © Int. J. of GEOMATE.
format text
author Tang, Anthony John
De Jesus, Richard
Cunanan, Alvin
author_facet Tang, Anthony John
De Jesus, Richard
Cunanan, Alvin
author_sort Tang, Anthony John
title Microstructure and mechanical properties of concrete with treated recycled concrete aggregates
title_short Microstructure and mechanical properties of concrete with treated recycled concrete aggregates
title_full Microstructure and mechanical properties of concrete with treated recycled concrete aggregates
title_fullStr Microstructure and mechanical properties of concrete with treated recycled concrete aggregates
title_full_unstemmed Microstructure and mechanical properties of concrete with treated recycled concrete aggregates
title_sort microstructure and mechanical properties of concrete with treated recycled concrete aggregates
publisher Animo Repository
publishDate 2019
url https://animorepository.dlsu.edu.ph/faculty_research/4315
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