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Experimental study on the compressive strength, damping and interfacial transition zone properties of modified recycled aggregate concrete

At present, many modification methods have been proposed to improve the performance of recycled aggregate concrete (RAC). In this study, tests on the compressive strength and damping properties of modified RAC with the addition of different proportions of recycled coarse aggregate (RCA) (0, 50, 100%...

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Autores principales: Lei, Bin, Liu, Huajian, Yao, Zhimin, Tang, Zhuo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6936278/
https://www.ncbi.nlm.nih.gov/pubmed/31903200
http://dx.doi.org/10.1098/rsos.190813
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author Lei, Bin
Liu, Huajian
Yao, Zhimin
Tang, Zhuo
author_facet Lei, Bin
Liu, Huajian
Yao, Zhimin
Tang, Zhuo
author_sort Lei, Bin
collection PubMed
description At present, many modification methods have been proposed to improve the performance of recycled aggregate concrete (RAC). In this study, tests on the compressive strength and damping properties of modified RAC with the addition of different proportions of recycled coarse aggregate (RCA) (0, 50, 100%), rubber powder (10, 15, 20%), steel fibre (5, 7.5, 10%) and fly ash (15, 20, 5%) are carried out. To elucidate the effect of the modification method on the interfacial transition zone (ITZ) performance of RAC, model ITZ specimens are used for push-out tests. The results show that when the replacement rate of RCA reaches 100%, the loss factor of the RAC is 6.0% higher than that of natural aggregate concrete; however, the compressive strength of the RAC decreases by 22.6%. With the addition of 20% rubber powder, the damping capacity of the modified RAC increases by 213.7%, while the compressive strength of the modified RAC decreases by 47.5%. However, with the addition of steel fibre and fly ash, both the compressive strength and loss factor of the RAC specimens increase. With a steel fibre content of 10 wt%, the compressive strength and loss factor of the RAC increase by 21.9% and 15.2%, respectively. With a fly ash content of 25 wt%, the compressive strength and loss factor of the RAC increase by 8.6% and 6.9%, respectively. This demonstrates that steel fibre and fly ash are effective in improving both the damping properties and compressive strength of RAC, and steel fibre is more effective than fly ash. Two methods were used for modification of the RAC: reinforcing the RCA through impregnation with a 0.5% polyvinyl alcohol (PVA) emulsion and nano-SiO(2) solution, and strengthening the RAC integrally through the addition of fly ash as an admixture. Both of these techniques can improve the ITZ bond strength between the RAC and new mortar. Replacing 10% of the cement with fly ash in the new mortar is shown to be the best method to improve the ITZ strength.
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spelling pubmed-69362782020-01-03 Experimental study on the compressive strength, damping and interfacial transition zone properties of modified recycled aggregate concrete Lei, Bin Liu, Huajian Yao, Zhimin Tang, Zhuo R Soc Open Sci Engineering At present, many modification methods have been proposed to improve the performance of recycled aggregate concrete (RAC). In this study, tests on the compressive strength and damping properties of modified RAC with the addition of different proportions of recycled coarse aggregate (RCA) (0, 50, 100%), rubber powder (10, 15, 20%), steel fibre (5, 7.5, 10%) and fly ash (15, 20, 5%) are carried out. To elucidate the effect of the modification method on the interfacial transition zone (ITZ) performance of RAC, model ITZ specimens are used for push-out tests. The results show that when the replacement rate of RCA reaches 100%, the loss factor of the RAC is 6.0% higher than that of natural aggregate concrete; however, the compressive strength of the RAC decreases by 22.6%. With the addition of 20% rubber powder, the damping capacity of the modified RAC increases by 213.7%, while the compressive strength of the modified RAC decreases by 47.5%. However, with the addition of steel fibre and fly ash, both the compressive strength and loss factor of the RAC specimens increase. With a steel fibre content of 10 wt%, the compressive strength and loss factor of the RAC increase by 21.9% and 15.2%, respectively. With a fly ash content of 25 wt%, the compressive strength and loss factor of the RAC increase by 8.6% and 6.9%, respectively. This demonstrates that steel fibre and fly ash are effective in improving both the damping properties and compressive strength of RAC, and steel fibre is more effective than fly ash. Two methods were used for modification of the RAC: reinforcing the RCA through impregnation with a 0.5% polyvinyl alcohol (PVA) emulsion and nano-SiO(2) solution, and strengthening the RAC integrally through the addition of fly ash as an admixture. Both of these techniques can improve the ITZ bond strength between the RAC and new mortar. Replacing 10% of the cement with fly ash in the new mortar is shown to be the best method to improve the ITZ strength. The Royal Society 2019-12-04 /pmc/articles/PMC6936278/ /pubmed/31903200 http://dx.doi.org/10.1098/rsos.190813 Text en © 2019 The Authors. http://creativecommons.org/licenses/by/4.0/ Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.
spellingShingle Engineering
Lei, Bin
Liu, Huajian
Yao, Zhimin
Tang, Zhuo
Experimental study on the compressive strength, damping and interfacial transition zone properties of modified recycled aggregate concrete
title Experimental study on the compressive strength, damping and interfacial transition zone properties of modified recycled aggregate concrete
title_full Experimental study on the compressive strength, damping and interfacial transition zone properties of modified recycled aggregate concrete
title_fullStr Experimental study on the compressive strength, damping and interfacial transition zone properties of modified recycled aggregate concrete
title_full_unstemmed Experimental study on the compressive strength, damping and interfacial transition zone properties of modified recycled aggregate concrete
title_short Experimental study on the compressive strength, damping and interfacial transition zone properties of modified recycled aggregate concrete
title_sort experimental study on the compressive strength, damping and interfacial transition zone properties of modified recycled aggregate concrete
topic Engineering
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6936278/
https://www.ncbi.nlm.nih.gov/pubmed/31903200
http://dx.doi.org/10.1098/rsos.190813
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