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Influence of Parent Concrete Properties on Compressive Strength and Chloride Diffusion Coefficient of Concrete with Strengthened Recycled Aggregates

Parent concrete coming from a wide range of sources can result in considerable differences in the properties of recycled coarse aggregate (RCA). In this study, the RCAs were obtained by crushing the parent concrete with water-to-cement ratios (W/C(parent)) of 0.4, 0.5 and 0.6, respectively, and were...

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Autores principales: Ying, Jingwei, Han, Zewen, Shen, Luming, Li, Wengui
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7602982/
https://www.ncbi.nlm.nih.gov/pubmed/33081397
http://dx.doi.org/10.3390/ma13204631
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author Ying, Jingwei
Han, Zewen
Shen, Luming
Li, Wengui
author_facet Ying, Jingwei
Han, Zewen
Shen, Luming
Li, Wengui
author_sort Ying, Jingwei
collection PubMed
description Parent concrete coming from a wide range of sources can result in considerable differences in the properties of recycled coarse aggregate (RCA). In this study, the RCAs were obtained by crushing the parent concrete with water-to-cement ratios (W/C(parent)) of 0.4, 0.5 and 0.6, respectively, and were strengthened by carbonation and nano-silica slurry wrapping methods. It was found that when W/C(paren) was 0.3, 0.4 and 0.5, respectively, compared with the mortar in the untreated RCA, the capillary porosity of the mortar in the carbonated RCA decreased by 19%, 16% and 30%, respectively; the compressive strength of concrete containing the carbonated RCA increased by 13%, 11% and 13%, respectively; the chloride diffusion coefficient of RAC (D(RAC)) containing the nano-SiO(2) slurry-treated RCA decreased by 17%, 16% and 11%; and that of RAC containing the carbonated RCA decreased by 21%, 25% and 26%, respectively. Regardless of being strengthened or not, both D(RAC) and porosity of old mortar in RCAs increased with increasing W/C(parent). For different types of RCAs, D(RAC) increased obviously with increasing water absorption of RCA. Finally, a theoretical model of D(RAC) considering the water absorption of RCA was established and verified by experiments, which can be used to predict the D(RAC) under the influence of different factors, especially the water absorption of RCA.
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spelling pubmed-76029822020-11-01 Influence of Parent Concrete Properties on Compressive Strength and Chloride Diffusion Coefficient of Concrete with Strengthened Recycled Aggregates Ying, Jingwei Han, Zewen Shen, Luming Li, Wengui Materials (Basel) Article Parent concrete coming from a wide range of sources can result in considerable differences in the properties of recycled coarse aggregate (RCA). In this study, the RCAs were obtained by crushing the parent concrete with water-to-cement ratios (W/C(parent)) of 0.4, 0.5 and 0.6, respectively, and were strengthened by carbonation and nano-silica slurry wrapping methods. It was found that when W/C(paren) was 0.3, 0.4 and 0.5, respectively, compared with the mortar in the untreated RCA, the capillary porosity of the mortar in the carbonated RCA decreased by 19%, 16% and 30%, respectively; the compressive strength of concrete containing the carbonated RCA increased by 13%, 11% and 13%, respectively; the chloride diffusion coefficient of RAC (D(RAC)) containing the nano-SiO(2) slurry-treated RCA decreased by 17%, 16% and 11%; and that of RAC containing the carbonated RCA decreased by 21%, 25% and 26%, respectively. Regardless of being strengthened or not, both D(RAC) and porosity of old mortar in RCAs increased with increasing W/C(parent). For different types of RCAs, D(RAC) increased obviously with increasing water absorption of RCA. Finally, a theoretical model of D(RAC) considering the water absorption of RCA was established and verified by experiments, which can be used to predict the D(RAC) under the influence of different factors, especially the water absorption of RCA. MDPI 2020-10-16 /pmc/articles/PMC7602982/ /pubmed/33081397 http://dx.doi.org/10.3390/ma13204631 Text en © 2020 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
Ying, Jingwei
Han, Zewen
Shen, Luming
Li, Wengui
Influence of Parent Concrete Properties on Compressive Strength and Chloride Diffusion Coefficient of Concrete with Strengthened Recycled Aggregates
title Influence of Parent Concrete Properties on Compressive Strength and Chloride Diffusion Coefficient of Concrete with Strengthened Recycled Aggregates
title_full Influence of Parent Concrete Properties on Compressive Strength and Chloride Diffusion Coefficient of Concrete with Strengthened Recycled Aggregates
title_fullStr Influence of Parent Concrete Properties on Compressive Strength and Chloride Diffusion Coefficient of Concrete with Strengthened Recycled Aggregates
title_full_unstemmed Influence of Parent Concrete Properties on Compressive Strength and Chloride Diffusion Coefficient of Concrete with Strengthened Recycled Aggregates
title_short Influence of Parent Concrete Properties on Compressive Strength and Chloride Diffusion Coefficient of Concrete with Strengthened Recycled Aggregates
title_sort influence of parent concrete properties on compressive strength and chloride diffusion coefficient of concrete with strengthened recycled aggregates
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7602982/
https://www.ncbi.nlm.nih.gov/pubmed/33081397
http://dx.doi.org/10.3390/ma13204631
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