Mechanical properties of recycled aggregate concrete treated by variation in mixing approaches

Abstract Increased demand for natural aggregates (NA) due to infrastructural development has necessitated the use of alternative aggregates in the field of construction. One such option is the utilization of construction and demolition wastes, preferably named as recycled coarse aggregates (RCA) to...

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Autores principales:	Jagan,S., Neelakantan,T. R., Saravanakumar,P.
Lenguaje:	English
Publicado:	Escuela de Construcción Civil, Pontificia Universidad Católica de Chile 2021
Materias:	recycled coarse aggregate recycled aggregate concrete mixing approach adhered mortar processing techniques
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-915X2021000200236
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spelling	oai:scielo:S0718-915X20210002002362021-09-15Mechanical properties of recycled aggregate concrete treated by variation in mixing approachesJagan,S.Neelakantan,T. R.Saravanakumar,P. recycled coarse aggregate recycled aggregate concrete mixing approach adhered mortar processing techniques Abstract Increased demand for natural aggregates (NA) due to infrastructural development has necessitated the use of alternative aggregates in the field of construction. One such option is the utilization of construction and demolition wastes, preferably named as recycled coarse aggregates (RCA) to produce a sustainable recycled aggregate concrete (RAC). Perhaps, the quality of RCA is usually poor due to the presence of adhered mortar on its surface affecting the strength and durability properties of RAC. Consequently, it is essential to improve the behavior of recycled aggregate concrete. In order to improve the recycled concrete aggregate, four different processing techniques such as two-stage mixing approach (TSMA), mortar mixing approach (MMA), sand enveloped mixing approach (SEMA) and double mixing approach (DMA) were used to improve the quality of RAC. This paper aims at providing a comparative study on the suitability of different mixing approaches and their influence over the fresh and hardened properties of recycled aggregate concrete. The performance behaviour of RAC was evaluated at 7, 14, 28 and 90 days with various percentage replacements of RCA at w/c ratios of 0.45 and 0.5. Experimental results indicate that the strength of concrete made of 100% RCA was equivalent to the target strength at 90 days. Also, among the various mixing processing techniques, MMA shows better fresh and hardened properties of concrete at different curing ages. Micro-structural investigations through SEM were performed to investigate the modification in the ITZ of the RAC through MMA approach.info:eu-repo/semantics/openAccessEscuela de Construcción Civil, Pontificia Universidad Católica de ChileRevista de la construcción v.20 n.2 20212021-09-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-915X2021000200236en10.7764/rdlc.20.2.336
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	recycled coarse aggregate recycled aggregate concrete mixing approach adhered mortar processing techniques
spellingShingle	recycled coarse aggregate recycled aggregate concrete mixing approach adhered mortar processing techniques Jagan,S. Neelakantan,T. R. Saravanakumar,P. Mechanical properties of recycled aggregate concrete treated by variation in mixing approaches
description	Abstract Increased demand for natural aggregates (NA) due to infrastructural development has necessitated the use of alternative aggregates in the field of construction. One such option is the utilization of construction and demolition wastes, preferably named as recycled coarse aggregates (RCA) to produce a sustainable recycled aggregate concrete (RAC). Perhaps, the quality of RCA is usually poor due to the presence of adhered mortar on its surface affecting the strength and durability properties of RAC. Consequently, it is essential to improve the behavior of recycled aggregate concrete. In order to improve the recycled concrete aggregate, four different processing techniques such as two-stage mixing approach (TSMA), mortar mixing approach (MMA), sand enveloped mixing approach (SEMA) and double mixing approach (DMA) were used to improve the quality of RAC. This paper aims at providing a comparative study on the suitability of different mixing approaches and their influence over the fresh and hardened properties of recycled aggregate concrete. The performance behaviour of RAC was evaluated at 7, 14, 28 and 90 days with various percentage replacements of RCA at w/c ratios of 0.45 and 0.5. Experimental results indicate that the strength of concrete made of 100% RCA was equivalent to the target strength at 90 days. Also, among the various mixing processing techniques, MMA shows better fresh and hardened properties of concrete at different curing ages. Micro-structural investigations through SEM were performed to investigate the modification in the ITZ of the RAC through MMA approach.
author	Jagan,S. Neelakantan,T. R. Saravanakumar,P.
author_facet	Jagan,S. Neelakantan,T. R. Saravanakumar,P.
author_sort	Jagan,S.
title	Mechanical properties of recycled aggregate concrete treated by variation in mixing approaches
title_short	Mechanical properties of recycled aggregate concrete treated by variation in mixing approaches
title_full	Mechanical properties of recycled aggregate concrete treated by variation in mixing approaches
title_fullStr	Mechanical properties of recycled aggregate concrete treated by variation in mixing approaches
title_full_unstemmed	Mechanical properties of recycled aggregate concrete treated by variation in mixing approaches
title_sort	mechanical properties of recycled aggregate concrete treated by variation in mixing approaches
publisher	Escuela de Construcción Civil, Pontificia Universidad Católica de Chile
publishDate	2021
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-915X2021000200236
work_keys_str_mv	AT jagans mechanicalpropertiesofrecycledaggregateconcretetreatedbyvariationinmixingapproaches AT neelakantantr mechanicalpropertiesofrecycledaggregateconcretetreatedbyvariationinmixingapproaches AT saravanakumarp mechanicalpropertiesofrecycledaggregateconcretetreatedbyvariationinmixingapproaches
_version_	1718324138542628864

Mechanical properties of recycled aggregate concrete treated by variation in mixing approaches

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