Study on the Sulfate Corrosion of Concrete under the Action of Loading

Xing, Feng; Huang, Zhan; Dong, Bi Qin; Li, Jun; Zhang, Ming; Luo, Sihai

doi:10.4028/www.scientific.net/kem.400-402.175

Cited by 4 publications

(4 citation statements)

References 1 publication

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“…The first step is the 3D reconstruction of the image. After marking out the holes on each concrete slice through professional Avizo software processing, each slice can be combined and re-modeled so that a three-dimensional image consisting of hole connections can be seen and can be rotated arbitrarily to observe and analyze the development trend and damage of holes and cracks from different angles, and also the number of voids, porosity three-dimensional statistics and other data can be further modeled through threedimensional analysis [34]. Then, the cracks or pores were observed by analyzing the NS with different admixtures at different number of repetitions of DWC.…”

Section: Different Number Of Repetitions Of Dwcmentioning

confidence: 99%

Nano-SiO2 Recycled Concrete Anti-Sulfate Performance and Damage Mechanism Research

et al. 2023

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The use of construction waste for concrete is an effective way to reduce the environmental burden while improving the sustainability of construction materials. Nano-SiO2 (NS) has excellent volcanic ash activity, which can effectively improve the strength of concrete. In this study, the synergistic effects of NS and 30% recycled concrete aggregate (RCA) on the mass loss, compressive strength, ultrasonic sound velocity values and microstructure of RAC after 25, 50, 75 and 100 repetitions of a dry–wet cycle (DWC) of sulfuric acid were investigated. The results show that NS has a significant role in improving RAC performance. The RAC specimens showed the lowest mass loss rate, the highest compressive strength, the lowest ultrasonic velocity value and the best resistance to sulfate erosion when the NS doping was 4%. Meanwhile, under CT and SEM, RAC with NS has lower porosity and higher hydration, which can effectively inhibit the crack generation and has stable volume growth within 0–50 repetitions of DWC. In addition, the addition of NS improves not only the microstructure of the substrate but also the interfacial transition zone (ITZ). When 4% NS was added, the porosity was the lowest and the durability improvement was the best performance. This study not only improves the production performance of RAC but also provides a strong reference for the integrated application of nanomaterials in concrete.

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Section: Different Number Of Repetitions Of Dwcmentioning

confidence: 99%

Nano-SiO2 Recycled Concrete Anti-Sulfate Performance and Damage Mechanism Research

et al. 2023

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“…In recent years, concrete has gradually been utilized in environments with sulfate attack and high strain rates, and the research on the dynamic performance of concrete under sulfate attack has been highlighted (Feng et al, 2009;Xia et al, 2021;Yao et al, 2021;Bai et al, 2022;Guo et al, 2023;Wei et al, 2023). Li R. et al (LiHouHu and Zou, 2021) observed that the elevated sulfate concentrations lead to increased mechanical damage of concrete under varying high water pressures and sulfate attack.…”

Section: Introductionmentioning

confidence: 99%

Study on the mechanical properties and energy dissipation characteristics of concrete subjected to high strain rate and sulfate attack

Liu,

Zhang,

et al. 2023

Front. Earth Sci.

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Marine structures, such as cross-sea bridges, port constructions, and offshore drilling platforms, are not only subjected to sulfate erosion, but also to various dynamic loads. Analyzing the damage evolution process of concrete under sulfate erosion and impact loads is the key to improving the lifespan of concrete. In order to study the damage evolution process of eroded concrete under high strain rates, the energy dissipation characteristics, basic physics and mechanical properties, and micro-fracture mechanism of sulfate-eroded concrete at different sulfate concentrations (C=0, 3%, 6%, and 9%) under high strain rate ranging from 70/s to 85/s are systematically studied by using the split Hopkinson pressure bar (SHPB) test system, X-ray diffractometer and SEM scanning electron microscope. The research results indicate that an increase in sulfate concentration leads to a decrease in Ca(OH)2 content and an increase in Ettringite (AFt) content in concrete specimens; As the sulfate concentration increases, the dynamic peak strength and dynamic elastic modulus of concrete specimens gradually decrease, while the dynamic peak strain of concrete specimens gradually increases; The degree of macroscopic fragmentation in concrete specimens subjected to impact compression becomes increasingly severe with rising sulfate concentrations; As the sulfate concentration increases, the proportion of reflected energy and dissipated energy gradually increases, while that of transmitted energy gradually decreases, and the energy absorption capacity of the sample is significantly improved; The results of the SEM test shows that with the increase of sulfate concentration, a large amount of AFt is generated at the joint fissures and the interface of cement aggregates, the expansion of AFt and the crack development of concrete reduce the integrity and stability of concrete. This study holds significant guidance for the application of concrete in impact situations under a sulfate attack environment.

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“…Domestic and foreign scholars have done a lot of research on concrete sulfate corrosion [9][10][11][12], to which the corrosion mechanism and ways to improve concrete anti-sulfate corrosion ability are paid much attention in particular. On concrete itself, water-cement (w/c) ratio has a significant impact against sulfate corrosion.…”

Section: Introductionmentioning

confidence: 99%

Effects of Water-Cement Ratio on Concrete Sulfate Corrosion Rate

Han

et al. 2016

KEM

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Water-cement (w/c) ratio is an important parameter in concrete mix ratio design, which also plays an important influence on concrete sulfate corrosion rate. In this paper, concrete cubic specimens with w/c of ratio as 0.4, 0.5 and 0.6 were fabricated, respectively, and put into 10% Na2SO4 solution and tap water for 240 days. During the submerging process, superficial corrosion phenomena were observed and concrete cubic strengths were measured periodically. The results showed that the lower the w/c ratio, the stronger the concrete sulfate corrosion resistance is. At the same time, concrete with lower w/c ratio always correspond smaller corrosion layer thickness. Based on the degradation of cubic compressive strength of corroded concrete specimens, the development models of corrosion thickness of each w/c ratio concrete are established as sulfate corrosion goes on

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Study on the Sulfate Corrosion of Concrete under the Action of Loading

Cited by 4 publications

References 1 publication

Nano-SiO2 Recycled Concrete Anti-Sulfate Performance and Damage Mechanism Research

Nano-SiO2 Recycled Concrete Anti-Sulfate Performance and Damage Mechanism Research

Study on the mechanical properties and energy dissipation characteristics of concrete subjected to high strain rate and sulfate attack

Effects of Water-Cement Ratio on Concrete Sulfate Corrosion Rate

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