Experimental Study on Chloride-Induced Corrosion of Soil Nail with Engineered Cementitious Composites (ECC) Grout

Conventionally, a soil nail is a piece of steel reinforcement installed inside a hole drilled into the slope and filled with cement paste (CP) grout. Chloride penetration is a major deterioration mechanism of conventional soil nails as the CP grout is easy to crack with an uncontrollable crack openi...

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Autores principales:	Haoliang Wu, Jing Yu, Jiajia Zhou, Weiwen Li, Christopher K. Y. Leung
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	engineered cementitious composite (ECC) soil nail chloride-induced corrosion durability chloride diffusion coefficient Technology T
Acceso en línea:	https://doaj.org/article/986f1718ab624ffcb90dccfc9814f952
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spelling	oai:doaj.org-article:986f1718ab624ffcb90dccfc9814f9522021-11-25T17:58:53ZExperimental Study on Chloride-Induced Corrosion of Soil Nail with Engineered Cementitious Composites (ECC) Grout10.3390/infrastructures61101612412-3811https://doaj.org/article/986f1718ab624ffcb90dccfc9814f9522021-11-01T00:00:00Zhttps://www.mdpi.com/2412-3811/6/11/161https://doaj.org/toc/2412-3811Conventionally, a soil nail is a piece of steel reinforcement installed inside a hole drilled into the slope and filled with cement paste (CP) grout. Chloride penetration is a major deterioration mechanism of conventional soil nails as the CP grout is easy to crack with an uncontrollable crack opening when the soil nail is subject to loading or ground movements. Engineered Cementitious Composites (ECC) are a class of fiber-reinforced material exhibiting excellent crack control even when loaded to several percent of strain, and therefore, ECCs have great potential to replace traditional CP grout in soil nails for achieving a long service life. In this study, the chloride ion transport characteristics and electrically accelerated corrosion process of steel rebar in ECC and CP grouts are systematically studied. The rapid chloride ion penetration test results showed a reduction of 76% and 58% passing charges in ECC with 0.15% and 0.3% pre-loading strain, respectively, as compared to that in un-cracked CP. Furthermore, the accelerated corrosion experimental data showed that ECC under pre-loading strain still exhibited a coefficient of chloride ion diffusion that is 20–50% lower than CP grout due to the ability to control crack width. Service life calculations based on experimentally measured parameters showed that the predicted corrosion rate and corrosion depth of soil nails in ECC grout were much lower than those in CP grout. The findings can facilitate the design of soil nails with excellent durability and long service life.Haoliang WuJing YuJiajia ZhouWeiwen LiChristopher K. Y. LeungMDPI AGarticleengineered cementitious composite (ECC)soil nailchloride-induced corrosiondurabilitychloride diffusion coefficientTechnologyTENInfrastructures, Vol 6, Iss 161, p 161 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	engineered cementitious composite (ECC) soil nail chloride-induced corrosion durability chloride diffusion coefficient Technology T
spellingShingle	engineered cementitious composite (ECC) soil nail chloride-induced corrosion durability chloride diffusion coefficient Technology T Haoliang Wu Jing Yu Jiajia Zhou Weiwen Li Christopher K. Y. Leung Experimental Study on Chloride-Induced Corrosion of Soil Nail with Engineered Cementitious Composites (ECC) Grout
description	Conventionally, a soil nail is a piece of steel reinforcement installed inside a hole drilled into the slope and filled with cement paste (CP) grout. Chloride penetration is a major deterioration mechanism of conventional soil nails as the CP grout is easy to crack with an uncontrollable crack opening when the soil nail is subject to loading or ground movements. Engineered Cementitious Composites (ECC) are a class of fiber-reinforced material exhibiting excellent crack control even when loaded to several percent of strain, and therefore, ECCs have great potential to replace traditional CP grout in soil nails for achieving a long service life. In this study, the chloride ion transport characteristics and electrically accelerated corrosion process of steel rebar in ECC and CP grouts are systematically studied. The rapid chloride ion penetration test results showed a reduction of 76% and 58% passing charges in ECC with 0.15% and 0.3% pre-loading strain, respectively, as compared to that in un-cracked CP. Furthermore, the accelerated corrosion experimental data showed that ECC under pre-loading strain still exhibited a coefficient of chloride ion diffusion that is 20–50% lower than CP grout due to the ability to control crack width. Service life calculations based on experimentally measured parameters showed that the predicted corrosion rate and corrosion depth of soil nails in ECC grout were much lower than those in CP grout. The findings can facilitate the design of soil nails with excellent durability and long service life.
format	article
author	Haoliang Wu Jing Yu Jiajia Zhou Weiwen Li Christopher K. Y. Leung
author_facet	Haoliang Wu Jing Yu Jiajia Zhou Weiwen Li Christopher K. Y. Leung
author_sort	Haoliang Wu
title	Experimental Study on Chloride-Induced Corrosion of Soil Nail with Engineered Cementitious Composites (ECC) Grout
title_short	Experimental Study on Chloride-Induced Corrosion of Soil Nail with Engineered Cementitious Composites (ECC) Grout
title_full	Experimental Study on Chloride-Induced Corrosion of Soil Nail with Engineered Cementitious Composites (ECC) Grout
title_fullStr	Experimental Study on Chloride-Induced Corrosion of Soil Nail with Engineered Cementitious Composites (ECC) Grout
title_full_unstemmed	Experimental Study on Chloride-Induced Corrosion of Soil Nail with Engineered Cementitious Composites (ECC) Grout
title_sort	experimental study on chloride-induced corrosion of soil nail with engineered cementitious composites (ecc) grout
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/986f1718ab624ffcb90dccfc9814f952
work_keys_str_mv	AT haoliangwu experimentalstudyonchlorideinducedcorrosionofsoilnailwithengineeredcementitiouscompositeseccgrout AT jingyu experimentalstudyonchlorideinducedcorrosionofsoilnailwithengineeredcementitiouscompositeseccgrout AT jiajiazhou experimentalstudyonchlorideinducedcorrosionofsoilnailwithengineeredcementitiouscompositeseccgrout AT weiwenli experimentalstudyonchlorideinducedcorrosionofsoilnailwithengineeredcementitiouscompositeseccgrout AT christopherkyleung experimentalstudyonchlorideinducedcorrosionofsoilnailwithengineeredcementitiouscompositeseccgrout
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Experimental Study on Chloride-Induced Corrosion of Soil Nail with Engineered Cementitious Composites (ECC) Grout

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