Hysteretic Behavior of Eccentrically Loaded Reinforced Air‐Entrained Concrete Columns under Combined Effects of Freeze‐Thaw Cycles and Seawater Corrosion

Wu, Jieqiong; Zhang, Jian; Diao, Bo; Cheng, Shaohong; Ye, Yinghua

doi:10.1155/2018/3931791

Cited by 3 publications

(2 citation statements)

References 17 publications

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“…Therefore, concrete durability under those effects has always been a research focus [1][2][3]. The durability of concrete will decrease when concrete is under the combined action of salt corrosion and the freeze-thaw cycle, which will reduce the service life of concrete structures [4][5][6][7]. The effect of environmental freeze-thaw cycles (FTCs) will increase the permeability of concrete, including its water absorption and ion permeability [8].…”

Section: Introductionmentioning

confidence: 99%

Concrete Durability after Load Damage and Salt Freeze–Thaw Cycles

et al. 2022

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To determine how the performance of concrete changes after initial load damage and salt freezing, concrete samples were first subjected to loading and unloading, and were then put into salt solutions to carry out rapid freeze–thaw cycle (FTC) experiments. Salt solutions were created based on the saline soil of western Jilin, China, for use in salt freeze–thaw testing. This determined the change law of the compressive strength and the dynamic elastic modulus (DEM). Additionally, low-field nuclear magnetic resonance technology and a scanning electron microscope were applied to investigate the pore characteristics and microstructure of concrete samples after FTCs. This study found that when the concrete specimens were subjected to an initial load of 0.3f under 50 FTCs, the loss in the compressive strength increased by 24% when the concrete was subjected to freeze–thaw cycles in freshwater and increased by 24% when concrete was subjected to freeze–thaw cycles in a 6.8% composite salt solution compared with the specimens without the initial load. When the concrete was subjected to FTCs in a 6.8% composite salt solution 50 times, the loss in the compressive strength increased by 110% for concrete without an initial load and increased by 109% when the concrete was subjected to an initial load of 0.3f compared with the specimens under FTCs in freshwater. The persistent effect of the FTCs also aggravated chloride ion erosion in the concrete, which gradually reduced the concrete’s permeability resistance. Internal pores in the concrete, especially the proportion of above-medium-sized pores, gradually increased along with the increase in the number of FTCs. There is a good linear correlation between the change rule of compressive mechanical properties and the change rules of mass, DEM, and pore characteristics inside the concrete under rapid FTCs in different salt solutions.

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Section: Introductionmentioning

confidence: 99%

Concrete Durability after Load Damage and Salt Freeze–Thaw Cycles

et al. 2022

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“…The mechanical properties of concrete structures, such as concrete dams and bridges, are greatly affected by freeze-thaw cycles [14][15][16]. Scholars worldwide have carried out systematic studies on the durability damage mechanism, degradation law, and durability repair and promotion, obtaining many meaningful results, including single and multi-factor coupling actions and research on materials and structures [17][18][19]. In previous studies, few attempts have been made to study the coupled properties of micro-structure changes, chloride ion penetration, and mechanical properties of cement concrete.…”

Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of the Concrete Damage and Pore Characteristics under Salt-Freezing Cycles

Zhou

Wang

2022

Materials

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Herein, ordinary silicate concrete specimens are prepared to study the damage law of a cement-concrete material under the effects of salt erosion and a freeze–thaw environment. NaCl, NaHCO3, and Na2SO4 solutions are separately produced, according to the characteristics of saline soil, to conduct an experimental study on the concrete characteristics during quick salt freezing cycles, and to analyse the changes in its compressive strength, mass loss, and dynamic elastic modulus (DEM) under freeze–thaw cycles. Low-field nuclear magnetic resonance (NMR) and scanning electronic microscopy are used to investigate the change in the microstructure of concrete specimens under salt freeze–thaw cycles (FTCs). The results show the loss in compressive strength, mass, DEM, and NMR spectrum signal increased by 1.5–3 times, 3–5 times, 1.5–2.5 times, and 2–4 times, respectively, for concrete specimens under 50–100 FTCs in 6.8% composite salt solution, in comparison to fresh water. Apparent spalling, decreases in the DEM, and reductions in the compressive strength occur in concrete when increasing the number of salt FTCs. The number of internal cracks in the concrete structure increase under the combined action of salt crystallization, moisture absorption, and freeze–thaw. The changes in the internal microscopic pore volume in concrete structures exhibit the same trend with changes in the macro mechanical properties of concrete. The correlation coefficients between the changes in each peak in the NUR spectrum and the changes in the compressive strength of concrete specimens under FTCs in freshwater or low-concentration salt solutions are both larger than 0.7, calculated using the grey correlation degree method. Therefore, these changes could be used as a potential evaluation index for salt frozen damage to concrete structures.

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Durability and damage model of polyacrylonitrile fiber reinforced concrete under freeze–thaw and erosion

Duan

Qin

et al. 2023

Construction and Building Materials

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Hysteretic Behavior of Eccentrically Loaded Reinforced Air‐Entrained Concrete Columns under Combined Effects of Freeze‐Thaw Cycles and Seawater Corrosion

Cited by 3 publications

References 17 publications

Concrete Durability after Load Damage and Salt Freeze–Thaw Cycles

Concrete Durability after Load Damage and Salt Freeze–Thaw Cycles

Experimental Evaluation of the Concrete Damage and Pore Characteristics under Salt-Freezing Cycles

Durability and damage model of polyacrylonitrile fiber reinforced concrete under freeze–thaw and erosion

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