Experimental Study on Mechanical Properties and Pore Structure Deterioration of Concrete under Freeze–Thaw Cycles

Understanding the evolution of mechanical properties and microscopic pore structure of concrete after freeze–thaw cycles is essential to assess the durability and safety of concrete structures. In this work, the degradation law of mechanical properties and damage characteristic of micro-structure of...

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Autores principales:	Kai Zhang, Jing Zhou, Zhigang Yin
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	concrete mechanical properties microscopic pore structure freezing and thawing cycles NMR technique 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/e65c9c1dad574622a8f57d5c60b61897
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spelling	oai:doaj.org-article:e65c9c1dad574622a8f57d5c60b618972021-11-11T18:07:12ZExperimental Study on Mechanical Properties and Pore Structure Deterioration of Concrete under Freeze–Thaw Cycles10.3390/ma142165681996-1944https://doaj.org/article/e65c9c1dad574622a8f57d5c60b618972021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6568https://doaj.org/toc/1996-1944Understanding the evolution of mechanical properties and microscopic pore structure of concrete after freeze–thaw cycles is essential to assess the durability and safety of concrete structures. In this work, the degradation law of mechanical properties and damage characteristic of micro-structure of concrete with two water-cement ratios (w/c = 0.45 and 0.55) is investigated under the condition of freezing–thawing cycles. The influence of loading strain rate on dynamic compressive strength is studied. The microscopic pore structure after frost damage is measured by low-field nuclear magnetic resonance (LF-NMR) technique. Then, a damage model based on the porosity variation is established to quantitatively describe the degradation law of macroscopic mechanical properties. The test results show that the relative dynamic modulus of elasticity (RDME), dynamic compressive strength, flexural strength, and splitting tensile strength of concrete decrease with the increase of freeze–thaw cycles. Empirical relations of concrete dynamic increase factor (DIF) under the action of freeze–thaw cycles are proposed. Moreover, the experimental results of NMR indicate that the porosity as well as the proportion of meso-pores and macro-pores of concrete gradually increased with the increasing of freeze–thaw cycles. The research results can provide reference and experimental support for the anti-frost design theory and durability life prediction of hydraulic concrete structures in cold regions.Kai ZhangJing ZhouZhigang YinMDPI AGarticleconcretemechanical propertiesmicroscopic pore structurefreezing and thawing cyclesNMR techniqueTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6568, p 6568 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	concrete mechanical properties microscopic pore structure freezing and thawing cycles NMR technique 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	concrete mechanical properties microscopic pore structure freezing and thawing cycles NMR technique 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 Kai Zhang Jing Zhou Zhigang Yin Experimental Study on Mechanical Properties and Pore Structure Deterioration of Concrete under Freeze–Thaw Cycles
description	Understanding the evolution of mechanical properties and microscopic pore structure of concrete after freeze–thaw cycles is essential to assess the durability and safety of concrete structures. In this work, the degradation law of mechanical properties and damage characteristic of micro-structure of concrete with two water-cement ratios (w/c = 0.45 and 0.55) is investigated under the condition of freezing–thawing cycles. The influence of loading strain rate on dynamic compressive strength is studied. The microscopic pore structure after frost damage is measured by low-field nuclear magnetic resonance (LF-NMR) technique. Then, a damage model based on the porosity variation is established to quantitatively describe the degradation law of macroscopic mechanical properties. The test results show that the relative dynamic modulus of elasticity (RDME), dynamic compressive strength, flexural strength, and splitting tensile strength of concrete decrease with the increase of freeze–thaw cycles. Empirical relations of concrete dynamic increase factor (DIF) under the action of freeze–thaw cycles are proposed. Moreover, the experimental results of NMR indicate that the porosity as well as the proportion of meso-pores and macro-pores of concrete gradually increased with the increasing of freeze–thaw cycles. The research results can provide reference and experimental support for the anti-frost design theory and durability life prediction of hydraulic concrete structures in cold regions.
format	article
author	Kai Zhang Jing Zhou Zhigang Yin
author_facet	Kai Zhang Jing Zhou Zhigang Yin
author_sort	Kai Zhang
title	Experimental Study on Mechanical Properties and Pore Structure Deterioration of Concrete under Freeze–Thaw Cycles
title_short	Experimental Study on Mechanical Properties and Pore Structure Deterioration of Concrete under Freeze–Thaw Cycles
title_full	Experimental Study on Mechanical Properties and Pore Structure Deterioration of Concrete under Freeze–Thaw Cycles
title_fullStr	Experimental Study on Mechanical Properties and Pore Structure Deterioration of Concrete under Freeze–Thaw Cycles
title_full_unstemmed	Experimental Study on Mechanical Properties and Pore Structure Deterioration of Concrete under Freeze–Thaw Cycles
title_sort	experimental study on mechanical properties and pore structure deterioration of concrete under freeze–thaw cycles
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/e65c9c1dad574622a8f57d5c60b61897
work_keys_str_mv	AT kaizhang experimentalstudyonmechanicalpropertiesandporestructuredeteriorationofconcreteunderfreezethawcycles AT jingzhou experimentalstudyonmechanicalpropertiesandporestructuredeteriorationofconcreteunderfreezethawcycles AT zhigangyin experimentalstudyonmechanicalpropertiesandporestructuredeteriorationofconcreteunderfreezethawcycles
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Experimental Study on Mechanical Properties and Pore Structure Deterioration of Concrete under Freeze–Thaw Cycles

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