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Feasibility of Utilizing Recycled Aggregate Concrete for Revetment Construction of the Lower Yellow River

To explore the feasibility of utilizing recycled aggregate concrete (RAC) in revetment construction of the lower Yellow River, a series of mix proportions with local recycled aggregates (RA) were designed to evaluate its mechanical properties and durability. The morphology and micro-hardness of the...

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Autores principales: Feng, Pan, Chang, Honglei, Xu, Guodong, Liu, Qiaoling, Jin, Zuquan, Liu, Jian
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6947320/
https://www.ncbi.nlm.nih.gov/pubmed/31861189
http://dx.doi.org/10.3390/ma12244237
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author Feng, Pan
Chang, Honglei
Xu, Guodong
Liu, Qiaoling
Jin, Zuquan
Liu, Jian
author_facet Feng, Pan
Chang, Honglei
Xu, Guodong
Liu, Qiaoling
Jin, Zuquan
Liu, Jian
author_sort Feng, Pan
collection PubMed
description To explore the feasibility of utilizing recycled aggregate concrete (RAC) in revetment construction of the lower Yellow River, a series of mix proportions with local recycled aggregates (RA) were designed to evaluate its mechanical properties and durability. The morphology and micro-hardness of the interface transition zone (ITZ) were also characterized to explain the performance of RAC. Based on the compressive strength data of 13 groups of mixtures, which is larger than 30 MPa, and with the RA substitution rate not less than 50%, the RAC containing 50% recycled fine aggregate (RFA) (HDX50), 70% RFA (HDX70), and 50% recycled coarse aggregate (RCA) (HDC50) were selected. The experiment results suggest that the mechanical performance, frost resistance, and carbonation resistance of the selected RAC is generally poorer than that of natural aggregate concrete (NAC), but can meet the performance requirement of concrete for the revetment construction of the lower Yellow River. The comprehensive performance of these three mixtures ranks as: HDX50 > HDX70 > HDC50. When considering the RA substitution ratio as a priority, HDX70 would be the best choice and can be applied in the revetment engineering. A number of defects are observed on the surface of RA with old pastes attached. Furthermore, the ITZs formed around RA are loose and with low micro-hardness, which is deemed to be the dominating reasons leading to the weaker performance of RAC than that of NAC.
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spelling pubmed-69473202020-01-13 Feasibility of Utilizing Recycled Aggregate Concrete for Revetment Construction of the Lower Yellow River Feng, Pan Chang, Honglei Xu, Guodong Liu, Qiaoling Jin, Zuquan Liu, Jian Materials (Basel) Article To explore the feasibility of utilizing recycled aggregate concrete (RAC) in revetment construction of the lower Yellow River, a series of mix proportions with local recycled aggregates (RA) were designed to evaluate its mechanical properties and durability. The morphology and micro-hardness of the interface transition zone (ITZ) were also characterized to explain the performance of RAC. Based on the compressive strength data of 13 groups of mixtures, which is larger than 30 MPa, and with the RA substitution rate not less than 50%, the RAC containing 50% recycled fine aggregate (RFA) (HDX50), 70% RFA (HDX70), and 50% recycled coarse aggregate (RCA) (HDC50) were selected. The experiment results suggest that the mechanical performance, frost resistance, and carbonation resistance of the selected RAC is generally poorer than that of natural aggregate concrete (NAC), but can meet the performance requirement of concrete for the revetment construction of the lower Yellow River. The comprehensive performance of these three mixtures ranks as: HDX50 > HDX70 > HDC50. When considering the RA substitution ratio as a priority, HDX70 would be the best choice and can be applied in the revetment engineering. A number of defects are observed on the surface of RA with old pastes attached. Furthermore, the ITZs formed around RA are loose and with low micro-hardness, which is deemed to be the dominating reasons leading to the weaker performance of RAC than that of NAC. MDPI 2019-12-17 /pmc/articles/PMC6947320/ /pubmed/31861189 http://dx.doi.org/10.3390/ma12244237 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Feng, Pan
Chang, Honglei
Xu, Guodong
Liu, Qiaoling
Jin, Zuquan
Liu, Jian
Feasibility of Utilizing Recycled Aggregate Concrete for Revetment Construction of the Lower Yellow River
title Feasibility of Utilizing Recycled Aggregate Concrete for Revetment Construction of the Lower Yellow River
title_full Feasibility of Utilizing Recycled Aggregate Concrete for Revetment Construction of the Lower Yellow River
title_fullStr Feasibility of Utilizing Recycled Aggregate Concrete for Revetment Construction of the Lower Yellow River
title_full_unstemmed Feasibility of Utilizing Recycled Aggregate Concrete for Revetment Construction of the Lower Yellow River
title_short Feasibility of Utilizing Recycled Aggregate Concrete for Revetment Construction of the Lower Yellow River
title_sort feasibility of utilizing recycled aggregate concrete for revetment construction of the lower yellow river
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6947320/
https://www.ncbi.nlm.nih.gov/pubmed/31861189
http://dx.doi.org/10.3390/ma12244237
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