Optimization of microbial induced carbonate precipitation treatment process to improve recycled fine aggregate

Microbial induced carbonate precipitation (MICP) is a novel and environmentally-friendly method to improve the properties of recycled aggregate. This study focused on the optimization of MICP treatment process, mainly including the modification duration, the addition method of calcium source and the...

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Autores principales:	Yuxi Zhao, Ligang Peng, Zhangyao Feng, Zhenmei Lu
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Recycled fine aggregate (RFA) Microbial induced carbonate precipitation (MICP) Treatment process Flexural strength Carbonation resistance Pore structure Materials of engineering and construction. Mechanics of materials TA401-492
Acceso en línea:	https://doaj.org/article/29f616f9f68e4900a79c3a29a13196d5
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spelling	oai:doaj.org-article:29f616f9f68e4900a79c3a29a13196d52021-12-01T05:06:57ZOptimization of microbial induced carbonate precipitation treatment process to improve recycled fine aggregate2772-397610.1016/j.clema.2021.100003https://doaj.org/article/29f616f9f68e4900a79c3a29a13196d52021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2772397621000034https://doaj.org/toc/2772-3976Microbial induced carbonate precipitation (MICP) is a novel and environmentally-friendly method to improve the properties of recycled aggregate. This study focused on the optimization of MICP treatment process, mainly including the modification duration, the addition method of calcium source and the number of modification cycles, to improve the quality of recycled fine aggregate (RFA). Weight increase and water absorption decrease of RFA after MICP modification were used to evaluate the effects on the improvement in properties of RFA. The properties of the mortar with modified RFA were examined to investigate the effectiveness of the proposed MICP treatment process. The results show that the optimal MICP treatment process consisted of disposable addition of calcium source and repeating 3 modification cycles with single modification duration of 1 d, verified by the SEM observation and XRD analysis; the mortar with RFA modified by the proposed MICP process showed higher flexural strength and carbonation resistance, which can be explained by the better pore structure at a microscopic level.Yuxi ZhaoLigang PengZhangyao FengZhenmei LuElsevierarticleRecycled fine aggregate (RFA)Microbial induced carbonate precipitation (MICP)Treatment processFlexural strengthCarbonation resistancePore structureMaterials of engineering and construction. Mechanics of materialsTA401-492ENCleaner Materials, Vol 1, Iss , Pp 100003- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Recycled fine aggregate (RFA) Microbial induced carbonate precipitation (MICP) Treatment process Flexural strength Carbonation resistance Pore structure Materials of engineering and construction. Mechanics of materials TA401-492
spellingShingle	Recycled fine aggregate (RFA) Microbial induced carbonate precipitation (MICP) Treatment process Flexural strength Carbonation resistance Pore structure Materials of engineering and construction. Mechanics of materials TA401-492 Yuxi Zhao Ligang Peng Zhangyao Feng Zhenmei Lu Optimization of microbial induced carbonate precipitation treatment process to improve recycled fine aggregate
description	Microbial induced carbonate precipitation (MICP) is a novel and environmentally-friendly method to improve the properties of recycled aggregate. This study focused on the optimization of MICP treatment process, mainly including the modification duration, the addition method of calcium source and the number of modification cycles, to improve the quality of recycled fine aggregate (RFA). Weight increase and water absorption decrease of RFA after MICP modification were used to evaluate the effects on the improvement in properties of RFA. The properties of the mortar with modified RFA were examined to investigate the effectiveness of the proposed MICP treatment process. The results show that the optimal MICP treatment process consisted of disposable addition of calcium source and repeating 3 modification cycles with single modification duration of 1 d, verified by the SEM observation and XRD analysis; the mortar with RFA modified by the proposed MICP process showed higher flexural strength and carbonation resistance, which can be explained by the better pore structure at a microscopic level.
format	article
author	Yuxi Zhao Ligang Peng Zhangyao Feng Zhenmei Lu
author_facet	Yuxi Zhao Ligang Peng Zhangyao Feng Zhenmei Lu
author_sort	Yuxi Zhao
title	Optimization of microbial induced carbonate precipitation treatment process to improve recycled fine aggregate
title_short	Optimization of microbial induced carbonate precipitation treatment process to improve recycled fine aggregate
title_full	Optimization of microbial induced carbonate precipitation treatment process to improve recycled fine aggregate
title_fullStr	Optimization of microbial induced carbonate precipitation treatment process to improve recycled fine aggregate
title_full_unstemmed	Optimization of microbial induced carbonate precipitation treatment process to improve recycled fine aggregate
title_sort	optimization of microbial induced carbonate precipitation treatment process to improve recycled fine aggregate
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/29f616f9f68e4900a79c3a29a13196d5
work_keys_str_mv	AT yuxizhao optimizationofmicrobialinducedcarbonateprecipitationtreatmentprocesstoimproverecycledfineaggregate AT ligangpeng optimizationofmicrobialinducedcarbonateprecipitationtreatmentprocesstoimproverecycledfineaggregate AT zhangyaofeng optimizationofmicrobialinducedcarbonateprecipitationtreatmentprocesstoimproverecycledfineaggregate AT zhenmeilu optimizationofmicrobialinducedcarbonateprecipitationtreatmentprocesstoimproverecycledfineaggregate
_version_	1718405530595098624

Optimization of microbial induced carbonate precipitation treatment process to improve recycled fine aggregate

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