Effect of Manufactured Sand with Different Quality on Chloride Penetration Resistance of High–Strength Recycled Concrete

High–strength manufactured sand recycled aggregate concrete (MSRAC) prepared with manufactured sand (MS) and recycled coarse aggregate (RCA) is an effective way to reduce the consumption of natural aggregate resources and environmental impact of concrete industry. In this study, high–, medium– and l...

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Autores principales:	Jincai Feng, Chaoqun Dong, Chunhong Chen, Xinjie Wang, Zhongqiu Qian
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	manufactured sand chloride penetration resistance recycled aggregate concrete high–strength concrete Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/d98c4bef6e6d49839a7888de786cc3d8
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spelling	oai:doaj.org-article:d98c4bef6e6d49839a7888de786cc3d82021-11-25T18:16:21ZEffect of Manufactured Sand with Different Quality on Chloride Penetration Resistance of High–Strength Recycled Concrete10.3390/ma142271011996-1944https://doaj.org/article/d98c4bef6e6d49839a7888de786cc3d82021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/22/7101https://doaj.org/toc/1996-1944High–strength manufactured sand recycled aggregate concrete (MSRAC) prepared with manufactured sand (MS) and recycled coarse aggregate (RCA) is an effective way to reduce the consumption of natural aggregate resources and environmental impact of concrete industry. In this study, high–, medium– and low–quality MS, which were commercial MS local to Changzhou and 100% by volume of recycled coarse aggregate, were used to prepare MSRAC. The quality of MS was determined based on stone powder content, methylene blue value (MBV), crushing value and soundness as quality characteristic parameters. The variation laws of compressive strength and chloride penetration resistance of high–strength MSRAC with different rates of replacement and different qualities of MS were explored. The results showed that for medium– and low–quality MS, the compressive strength of the MSRAC increased first and then decreased with increasing rate of replacement. Conversely, for high–quality MS, the compressive strength gradually increased with increasing rate of replacement. The chloride diffusion coefficient of MSRAC increased with decreasing MS quality and increasing rate of replacement. The chloride diffusion coefficient of MSRAC basically met the specifications for 50–year and 100–year design working life when the chloride environmental action was D and E. To prepare high–strength MSRAC, high–quality MS can 100% replace RS (river sand), while rates of replacement of 50–75% for medium–quality MS or 25–50% for low–quality MS are proposed. Scanning Electron Microscope (SEM) images indicated that an appropriate amount of stone powder is able to improve the compressive strength of RAC, but excessive stone powder content and MBV are unfavorable to the compressive strength and chloride penetration resistance of RAC.Jincai FengChaoqun DongChunhong ChenXinjie WangZhongqiu QianMDPI AGarticlemanufactured sandchloride penetration resistancerecycled aggregate concretehigh–strength concreteTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 7101, p 7101 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	manufactured sand chloride penetration resistance recycled aggregate concrete high–strength concrete Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	manufactured sand chloride penetration resistance recycled aggregate concrete high–strength concrete Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Jincai Feng Chaoqun Dong Chunhong Chen Xinjie Wang Zhongqiu Qian Effect of Manufactured Sand with Different Quality on Chloride Penetration Resistance of High–Strength Recycled Concrete
description	High–strength manufactured sand recycled aggregate concrete (MSRAC) prepared with manufactured sand (MS) and recycled coarse aggregate (RCA) is an effective way to reduce the consumption of natural aggregate resources and environmental impact of concrete industry. In this study, high–, medium– and low–quality MS, which were commercial MS local to Changzhou and 100% by volume of recycled coarse aggregate, were used to prepare MSRAC. The quality of MS was determined based on stone powder content, methylene blue value (MBV), crushing value and soundness as quality characteristic parameters. The variation laws of compressive strength and chloride penetration resistance of high–strength MSRAC with different rates of replacement and different qualities of MS were explored. The results showed that for medium– and low–quality MS, the compressive strength of the MSRAC increased first and then decreased with increasing rate of replacement. Conversely, for high–quality MS, the compressive strength gradually increased with increasing rate of replacement. The chloride diffusion coefficient of MSRAC increased with decreasing MS quality and increasing rate of replacement. The chloride diffusion coefficient of MSRAC basically met the specifications for 50–year and 100–year design working life when the chloride environmental action was D and E. To prepare high–strength MSRAC, high–quality MS can 100% replace RS (river sand), while rates of replacement of 50–75% for medium–quality MS or 25–50% for low–quality MS are proposed. Scanning Electron Microscope (SEM) images indicated that an appropriate amount of stone powder is able to improve the compressive strength of RAC, but excessive stone powder content and MBV are unfavorable to the compressive strength and chloride penetration resistance of RAC.
format	article
author	Jincai Feng Chaoqun Dong Chunhong Chen Xinjie Wang Zhongqiu Qian
author_facet	Jincai Feng Chaoqun Dong Chunhong Chen Xinjie Wang Zhongqiu Qian
author_sort	Jincai Feng
title	Effect of Manufactured Sand with Different Quality on Chloride Penetration Resistance of High–Strength Recycled Concrete
title_short	Effect of Manufactured Sand with Different Quality on Chloride Penetration Resistance of High–Strength Recycled Concrete
title_full	Effect of Manufactured Sand with Different Quality on Chloride Penetration Resistance of High–Strength Recycled Concrete
title_fullStr	Effect of Manufactured Sand with Different Quality on Chloride Penetration Resistance of High–Strength Recycled Concrete
title_full_unstemmed	Effect of Manufactured Sand with Different Quality on Chloride Penetration Resistance of High–Strength Recycled Concrete
title_sort	effect of manufactured sand with different quality on chloride penetration resistance of high–strength recycled concrete
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/d98c4bef6e6d49839a7888de786cc3d8
work_keys_str_mv	AT jincaifeng effectofmanufacturedsandwithdifferentqualityonchloridepenetrationresistanceofhighstrengthrecycledconcrete AT chaoqundong effectofmanufacturedsandwithdifferentqualityonchloridepenetrationresistanceofhighstrengthrecycledconcrete AT chunhongchen effectofmanufacturedsandwithdifferentqualityonchloridepenetrationresistanceofhighstrengthrecycledconcrete AT xinjiewang effectofmanufacturedsandwithdifferentqualityonchloridepenetrationresistanceofhighstrengthrecycledconcrete AT zhongqiuqian effectofmanufacturedsandwithdifferentqualityonchloridepenetrationresistanceofhighstrengthrecycledconcrete
_version_	1718411409419665408

Effect of Manufactured Sand with Different Quality on Chloride Penetration Resistance of High–Strength Recycled Concrete

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