Anisotropic effects of corrosion direction on the mechanical behaviors of cement mortar

Liu, Xiong; Chen, Haijun; Yao, Zhen

doi:10.1002/suco.201800133

Cited by 3 publications

(2 citation statements)

References 19 publications

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“…The compressive strength of cement mortar after immersed in sodium chloride solution is higher than that in sodium sulphate solution. The peak strain of cement mortar specimen after immersed in sodium chloride solution is lower than that in sodium sulphate solution after unidirection corrosion 10 . With an increase of sulphate dry‐wet cycles, the mass loss rate of concrete increases, 11 associated with the largest number of cracks 12 .…”

Section: Introductionmentioning

confidence: 96%

“…The peak strain of cement mortar specimen after immersed in sodium chloride solution is lower than that in sodium sulphate solution after unidirection corrosion. 10 With an increase of sulphate dry-wet cycles, the mass loss rate of concrete increases, 11 associated with the largest number of cracks. 12 The strength of concrete increases in the early stages of corrosion, and decreases gradually thereafter.…”

Section: Introductionmentioning

confidence: 99%

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Influence mechanisms under different immersion methods and different strengths of concrete in corrosive environments, and verification via long‐term field test

Zhang

Liu

et al. 2020

Structural Concrete

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This paper is to study the influence of sulphate corrosion on the mechanical behaviors of concrete, especially concrete corrosion under actual corrosion environment. This study investigated different immersion methods for concrete in a corrosion environment, and different strengths of concrete specimens with contents of sodium sulphate and magnesium chloride of 10.36% and 12.00%, respectively. Strength tests were performed on the specimens for the different immersion methods of full immersion, half-immersion, and dry-wet cycles, and with different strengths for the concrete of C20, C35, and C50. To study the internal mechanisms of the corrosion of concrete with different immersion methods and different strengths, a microscopic pore structure test was conducted. The field tests were performed after 12 years to evaluate the long term performance of the concrete under the actual environmental conditions. The test results show that full immersion mainly led to chemical corrosion, half immersion led to double damage from salt crystallization and chemical corrosion, and dry-wet cycles accelerated the corrosions of the salt crystallization and chemical corrosion. The higher the strength of concrete, the better its resistance to the sulphate corrosion. In comparison with the strength of the concrete before corrosion, field test results show that the strength of uncorroded concrete after 12 years is increased by 9.5% and the strength of corroded concrete after 12 years is reduced by 56.2%. The results of the strength tests and pore structure tests show that sulphate has a significant impact on concrete strength after 12 years of field tests. This study will contribute to improve long-term performance of the concrete, provide guidance for concrete Discussion on this paper must be submitted within two months of the print publication. The discussion will then be published in print, along with the authors' closure, if any, approximately nine months after the print publication.

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Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Influence mechanisms under different immersion methods and different strengths of concrete in corrosive environments, and verification via long‐term field test

Zhang

Liu

et al. 2020

Structural Concrete

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The study of gas flow in the industrial smoke pipe

Volodin

Marfina

Tsvetkovich³

2020

IOP Conf. Ser.: Mater. Sci. Eng.

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To describe the flow of flue gases in the working space of the exhaust shaft of an industrial chimney, a three-dimensional mathematical model based on the Favre-averaged complete Navier-Stokes equations closed by k-ε – a turbulence model using improved wall functions is proposed. Thus, it is possible to draw up a detailed physical picture of the process under study, to establish the presence of a significant part of the internal volume of the barrel of intensive secondary flows, vortex zones, which have a significant effect on the kinematic structure of the entire flow, on the nature of the velocity distribution in its various cross sections, as well as on friction, heat transfer and mass transfer in the parietal regions. The calculations showed that a swirling gas flow, which reduces the corrosion resistance of its walls appears in the root of the chimney. This undesirable phenomenon noticeably weakens in case of installation of special ramps or partitions at the inlet of the outlet trunk.

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Early Strength Evolution of Cement Grouts Adopted in Reinforced Concrete Subjected to Na2SO4 Corrosion

Xu¹,

Zhou²,

Jin³

2023

Buildings

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Due to the harsh application environment, sodium sulfate corrosion poses a considerable threat to the performance of reinforced concrete. Considering high fluidization and early strength cement grouts (HECG) are widely adopted in the repair engineering of reinforced concrete, HECG are also subjected to the action of corrosive substances. Even though numerous research results disclosed the effect of sodium sulfate corrosion on the performance and the degradation mechanisms of conventional cement grouts, the degradation mechanisms of HECG under sodium sulfate corrosion are still to be studied because HECG have the exceptional characteristics of high fluidization and early strength that conventional cement grouts do not have. Hence, the compressive and flexural strengths of HECG after corrosion with different sodium sulfate solution concentrations and corrosion times were tested in this study. Moreover, the evolution of the microstructure of HECG in the process of corrosion was analyzed with a Scanning Electron Microscope (SEM) test. The changes in the hydration products were investigated through the X-ray diffraction (XRD) test and the Differential Scanning Calorimeter (DSC) test. Consequently, the degradation mechanisms of HECG in the case of different sodium sulfate solution concentrations and corrosion times were revealed. The results indicate that the corrosion of sodium sulfate and hydration exists simultaneously when the corrosion time is less than 7 days. When the corrosion time is 14 days, the hydration of HECG was complete. The main source of the early strength of HECG is that the C-S-H gel crosses and clings to form a solid and compact whole in three-dimensional space. The effect of Na2SO4 on the early strength formation of HECG is that the corrosion of Na2SO4 can postpone the conversion of CH crystal into C-S-H gel and damage the generated CH crystal. This study on the degradation mechanisms of HECG exposed to sodium sulfate corrosion can provide new ideas for sulfate resistance and durability design of HECG.

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Anisotropic effects of corrosion direction on the mechanical behaviors of cement mortar

Cited by 3 publications

References 19 publications

Influence mechanisms under different immersion methods and different strengths of concrete in corrosive environments, and verification via long‐term field test

Influence mechanisms under different immersion methods and different strengths of concrete in corrosive environments, and verification via long‐term field test

The study of gas flow in the industrial smoke pipe

Early Strength Evolution of Cement Grouts Adopted in Reinforced Concrete Subjected to Na2SO4 Corrosion

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