Birnbaum-Saunders Durability Life Prediction Model of Site-Exposed Concrete in the Saline Soil Area

Aiming at the prominent problem of short durability life of concrete in saline soil area and the shortcomings of indoor accelerated test, an outdoor field exposure test was designed. The concrete specimens were semiburied in the Tianshui area with salinized soil characteristics, and nondestructive t...

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Autores principales:	Chenggong Lu, Zhiqiang Wei, Hongxia Qiao, Theogene Hakuzweyezu, Kan Li
Formato:	article
Lenguaje:	EN
Publicado:	Hindawi Limited 2021
Materias:	Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/ff98725bdbf540968e0ef41228a4299c
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spelling	oai:doaj.org-article:ff98725bdbf540968e0ef41228a4299c2021-11-08T02:37:24ZBirnbaum-Saunders Durability Life Prediction Model of Site-Exposed Concrete in the Saline Soil Area1687-809410.1155/2021/7644375https://doaj.org/article/ff98725bdbf540968e0ef41228a4299c2021-01-01T00:00:00Zhttp://dx.doi.org/10.1155/2021/7644375https://doaj.org/toc/1687-8094Aiming at the prominent problem of short durability life of concrete in saline soil area and the shortcomings of indoor accelerated test, an outdoor field exposure test was designed. The concrete specimens were semiburied in the Tianshui area with salinized soil characteristics, and nondestructive testing was conducted every 180d (days). The durability evaluation parameters and mechanical performance indexes were selected for macroscopic analysis, and the corrosion mechanism was analyzed by using the SEM image and the XRD phase. The Birnbaum-Saunders model based on physical failure and probability statistics was used for life prediction. The results show that there are rod-shaped and chip-shaped crystals growing from the surface of the gel and the internal holes in the exposed end and the embedded end of the concrete. However, the damage and deterioration of the buried end are more serious than those of the exposed end. The corrosion products mainly included ettringite, gypsum, calcium carbonate, sodium sulfate hydrate, carbosilite, and Friedel’s salt. The reliability life curve based on the Birnbaum-Saunders model can describe the whole process of exposed concrete from damage accumulation to failure. In addition, the dynamic modulus degradation index is more sensitive to concrete durability damage, and the life obtained by the Birnbaum-Saunders model is shorter than the quality degradation index. The life obtained by this degradation index is taken as the life of the concrete exposed in the saline soil site, and the concrete life of C30, C40, and C50 is about 3340d, 3930d, and 4360d, respectively.Chenggong LuZhiqiang WeiHongxia QiaoTheogene HakuzweyezuKan LiHindawi LimitedarticleEngineering (General). Civil engineering (General)TA1-2040ENAdvances in Civil Engineering, Vol 2021 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	Engineering (General). Civil engineering (General) TA1-2040 Chenggong Lu Zhiqiang Wei Hongxia Qiao Theogene Hakuzweyezu Kan Li Birnbaum-Saunders Durability Life Prediction Model of Site-Exposed Concrete in the Saline Soil Area
description	Aiming at the prominent problem of short durability life of concrete in saline soil area and the shortcomings of indoor accelerated test, an outdoor field exposure test was designed. The concrete specimens were semiburied in the Tianshui area with salinized soil characteristics, and nondestructive testing was conducted every 180d (days). The durability evaluation parameters and mechanical performance indexes were selected for macroscopic analysis, and the corrosion mechanism was analyzed by using the SEM image and the XRD phase. The Birnbaum-Saunders model based on physical failure and probability statistics was used for life prediction. The results show that there are rod-shaped and chip-shaped crystals growing from the surface of the gel and the internal holes in the exposed end and the embedded end of the concrete. However, the damage and deterioration of the buried end are more serious than those of the exposed end. The corrosion products mainly included ettringite, gypsum, calcium carbonate, sodium sulfate hydrate, carbosilite, and Friedel’s salt. The reliability life curve based on the Birnbaum-Saunders model can describe the whole process of exposed concrete from damage accumulation to failure. In addition, the dynamic modulus degradation index is more sensitive to concrete durability damage, and the life obtained by the Birnbaum-Saunders model is shorter than the quality degradation index. The life obtained by this degradation index is taken as the life of the concrete exposed in the saline soil site, and the concrete life of C30, C40, and C50 is about 3340d, 3930d, and 4360d, respectively.
format	article
author	Chenggong Lu Zhiqiang Wei Hongxia Qiao Theogene Hakuzweyezu Kan Li
author_facet	Chenggong Lu Zhiqiang Wei Hongxia Qiao Theogene Hakuzweyezu Kan Li
author_sort	Chenggong Lu
title	Birnbaum-Saunders Durability Life Prediction Model of Site-Exposed Concrete in the Saline Soil Area
title_short	Birnbaum-Saunders Durability Life Prediction Model of Site-Exposed Concrete in the Saline Soil Area
title_full	Birnbaum-Saunders Durability Life Prediction Model of Site-Exposed Concrete in the Saline Soil Area
title_fullStr	Birnbaum-Saunders Durability Life Prediction Model of Site-Exposed Concrete in the Saline Soil Area
title_full_unstemmed	Birnbaum-Saunders Durability Life Prediction Model of Site-Exposed Concrete in the Saline Soil Area
title_sort	birnbaum-saunders durability life prediction model of site-exposed concrete in the saline soil area
publisher	Hindawi Limited
publishDate	2021
url	https://doaj.org/article/ff98725bdbf540968e0ef41228a4299c
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Birnbaum-Saunders Durability Life Prediction Model of Site-Exposed Concrete in the Saline Soil Area

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