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Study on the Mechanical Properties and Durability of Recycled Aggregate Concrete under the Internal Curing Condition
Poor mechanical properties and durability of recycled aggregate concrete (RAC) hinder its application in the construction field. In this study, pre-wetted recycled coarse aggregate was used as the internal curing material for prepared RAC with low water-to-binder ratio (W/B), aiming to improve the m...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9457476/ https://www.ncbi.nlm.nih.gov/pubmed/36079294 http://dx.doi.org/10.3390/ma15175914 |
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author | Yang, Guanghao Li, Qiuyi Guo, Yuanxin Liu, Haibao Zheng, Shidong Chen, Mingxu |
author_facet | Yang, Guanghao Li, Qiuyi Guo, Yuanxin Liu, Haibao Zheng, Shidong Chen, Mingxu |
author_sort | Yang, Guanghao |
collection | PubMed |
description | Poor mechanical properties and durability of recycled aggregate concrete (RAC) hinder its application in the construction field. In this study, pre-wetted recycled coarse aggregate was used as the internal curing material for prepared RAC with low water-to-binder ratio (W/B), aiming to improve the mechanical properties and durability. The results show that the workability decreases with increasing contents of pre-wetted recycled coarse aggregate. The variation in compressive strength of RAC with different contents of pre-wetted recycled coarse aggregate is obvious within 28 d. After 28 d, the effect of internal curing of pre-wetted recycled coarse aggregate starts to occur, causing a sustained increase in compressive strength. The sealed concrete with 50% and 75% pre-wetted recycled coarse aggregate contents presents the highest compressive strength and better internal curing effect. The pre-wetted recycled coarse aggregate decreases the relative humidity inside the concrete and effectively inhibits the development of shrinkage in the early stages. The RAC with pre-wetted recycled coarse aggregate presents little effect on the drying shrinkage. Additionally, the electric flux of RAC cured for 28 d increases from 561C to 1001C, which presents good resistance to chloride permeation. Microscopic tests indicate that the incorporation of pre-wetted recycled coarse aggregate is beneficial to the improvements of internal structure of RAC. |
format | Online Article Text |
id | pubmed-9457476 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-94574762022-09-09 Study on the Mechanical Properties and Durability of Recycled Aggregate Concrete under the Internal Curing Condition Yang, Guanghao Li, Qiuyi Guo, Yuanxin Liu, Haibao Zheng, Shidong Chen, Mingxu Materials (Basel) Article Poor mechanical properties and durability of recycled aggregate concrete (RAC) hinder its application in the construction field. In this study, pre-wetted recycled coarse aggregate was used as the internal curing material for prepared RAC with low water-to-binder ratio (W/B), aiming to improve the mechanical properties and durability. The results show that the workability decreases with increasing contents of pre-wetted recycled coarse aggregate. The variation in compressive strength of RAC with different contents of pre-wetted recycled coarse aggregate is obvious within 28 d. After 28 d, the effect of internal curing of pre-wetted recycled coarse aggregate starts to occur, causing a sustained increase in compressive strength. The sealed concrete with 50% and 75% pre-wetted recycled coarse aggregate contents presents the highest compressive strength and better internal curing effect. The pre-wetted recycled coarse aggregate decreases the relative humidity inside the concrete and effectively inhibits the development of shrinkage in the early stages. The RAC with pre-wetted recycled coarse aggregate presents little effect on the drying shrinkage. Additionally, the electric flux of RAC cured for 28 d increases from 561C to 1001C, which presents good resistance to chloride permeation. Microscopic tests indicate that the incorporation of pre-wetted recycled coarse aggregate is beneficial to the improvements of internal structure of RAC. MDPI 2022-08-26 /pmc/articles/PMC9457476/ /pubmed/36079294 http://dx.doi.org/10.3390/ma15175914 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/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 (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Yang, Guanghao Li, Qiuyi Guo, Yuanxin Liu, Haibao Zheng, Shidong Chen, Mingxu Study on the Mechanical Properties and Durability of Recycled Aggregate Concrete under the Internal Curing Condition |
title | Study on the Mechanical Properties and Durability of Recycled Aggregate Concrete under the Internal Curing Condition |
title_full | Study on the Mechanical Properties and Durability of Recycled Aggregate Concrete under the Internal Curing Condition |
title_fullStr | Study on the Mechanical Properties and Durability of Recycled Aggregate Concrete under the Internal Curing Condition |
title_full_unstemmed | Study on the Mechanical Properties and Durability of Recycled Aggregate Concrete under the Internal Curing Condition |
title_short | Study on the Mechanical Properties and Durability of Recycled Aggregate Concrete under the Internal Curing Condition |
title_sort | study on the mechanical properties and durability of recycled aggregate concrete under the internal curing condition |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9457476/ https://www.ncbi.nlm.nih.gov/pubmed/36079294 http://dx.doi.org/10.3390/ma15175914 |
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