Damage degradation model of aeolian sand concrete under freeze–thaw cycles based on macro-microscopic perspective

Bai, Jianwen; Zhao, Yanru; Shi, Jinna; He, Xiang

doi:10.1016/j.conbuildmat.2022.126885

Cited by 55 publications

(9 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The pore characterization test utilized the NMR relaxation time method. It measured the transverse relaxation time (

) of hydrogen atoms in water-saturated specimens, a key indicator of the pore size distribution in concrete [ 25 ]. The equation for calculating

values in concrete’s water-bearing pores is detailed in Equation (4) [ 32 ].…”

Section: Methodsmentioning

confidence: 99%

“…This high level of R 2 values demonstrates the power function’s accuracy in modeling this relationship. The FTD model, referenced in studies by Yu et al [ 24 ] and Bai et al [ 25 ], includes both the count of FTCs and the concept of freeze–thaw fatigue life, which is the maximum number of FTCs a concrete can endure. This approach enables the use of power function fitting results to accurately estimate the freeze–thaw fatigue life of concrete.…”

Section: Evolutionary Analysis Of Freeze–thaw Damage (Ftd)mentioning

confidence: 99%

“…According to the principles of irreversible thermodynamics and continuous damage mechanics, Bai et al proposed the FTD model of concrete by introducing the fatigue damage theory [ 25 , 41 , 42 ], as shown in Equation (11).

where

was the critical damage factor for FTD obtained from the damage variable.…”

Section: Evolutionary Analysis Of Freeze–thaw Damage (Ftd)mentioning

confidence: 99%

“…Their approach integrated fatigue damage accumulation theory with the Aas–Jakobsen S–N formulation. Similarly, Bai et al [ 25 ] adapted fatigue damage theory to create macro and micro FTD equations specific to aeolian sand concrete, drawing on principles of irreversible thermodynamics and continuous damage mechanics. Although these models focus on concrete under standard curing conditions, there is a notable gap in research for FTD models under negative-temperature curing.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Freeze–Thaw Damage Degradation Model and Life Prediction of Air-Entrained Concrete in Multi-Year Permafrost Zone

Zhang,

Guo,

et al. 2023

Materials

View full text Add to dashboard Cite

The Qinghai–Tibet Plateau is the main permafrost area in China. Concrete structures constructed on permafrost are affected by the early negative-temperature environment. In particular, the negative-temperature environment seriously affects the strength growth process and the frost resistance of concrete (FRC). Therefore, this study considered the influence of the gas content, water–binder ratio (w/b), age, and other factors on the strength variation law and FRC under −3 °C curing conditions. Nuclear magnetic resonance (NMR) was used to analyze the pore structure of concrete before and after freeze–thaw cycles (FTCs). The results showed that the compressive strength of the concrete (CSC) under −3 °C curing was only 57.8–86.4% of that cured under standard conditions. The CSC under −3 °C curing showed an obvious age-lag phenomenon. The FRC under −3 °C curing was much lower than that under standard curing. The porosity of the concrete under −3 °C curing was greater, with a higher percentage of harmful and multi-harmful pores than that under standard curing. The concrete properties deteriorated primarily because curing at −3 °C hindered the hydration reaction compared with standard methods. This hindrance resulted in diminished hydration development, weakening the concrete’s structural integrity. Under both curing conditions, when the gas content was between 3.2% and 3.8%, the frost resistance was the best. This is because a gas content within this range effectively enhances the internal pore structure, therefore relieving the swelling pressure caused by FTCs. Based on the freeze–thaw damage (FTD) model proposed by previous authors, a new model for the CSC under −3 °C curing reaching that of the concrete under standard curing for 28 d was established in this study. This advanced model was capable of accurately assessing the FTD of concrete structures in permafrost regions. Finally, the life expectancy of concrete in Northwest China was predicted. The life of the concrete reached 46.9 years under standard curing, while the longest life of the concrete under −3 °C curing was only 12.9 years. Therefore, attention should be paid to constructing and curing concrete structures in cold environments.

show abstract

“…The pore characterization test utilized the NMR relaxation time method. It measured the transverse relaxation time (

) of hydrogen atoms in water-saturated specimens, a key indicator of the pore size distribution in concrete [ 25 ]. The equation for calculating

values in concrete’s water-bearing pores is detailed in Equation (4) [ 32 ].…”

Section: Methodsmentioning

confidence: 99%

Section: Evolutionary Analysis Of Freeze–thaw Damage (Ftd)mentioning

confidence: 99%

where

was the critical damage factor for FTD obtained from the damage variable.…”

Section: Evolutionary Analysis Of Freeze–thaw Damage (Ftd)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Freeze–Thaw Damage Degradation Model and Life Prediction of Air-Entrained Concrete in Multi-Year Permafrost Zone

Zhang,

Guo,

et al. 2023

Materials

View full text Add to dashboard Cite

show abstract

“…Their results indicated that AS has the potential to alter the pore arrangement of concrete, leading to variations in its strength and resistance to frost. Through a multi-scale investigation, Bai et al [37] and Li et al [38,39] examined the mechanical properties of AS concrete under F-T and analyzed how AS affects concrete's frost resistance at the microscopic level. Existing studies have revealed that the improved frost resistance of concrete with AS can be attributed to its unique physical and chemical properties, such as its small particle size and high-water absorption rate.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Shear Mechanical Properties of Fractured Rock Mass Reinforced by Aeolian-Sand (AS) Cement Mortar after Freeze-Thaw (F-T) Cycles

Liu,

Chen,

Zhang

et al. 2024

Preprint

View full text Add to dashboard Cite

The rock joint fissure slope in cold regions is prone to deformation and failure problems such as relaxation, tension and collapse under freeze-thaw (F-T) cycles. Based on the ideology of clean production and promoting the structural integrity of geotechnical projects in cold areas, this study designed and prepared aeolian-sand (AS) to replace part of river sand as a filling mortar material by taking advantage of the low cost and easy availability of AS. Investigations were carried out to determine the impact of varying proportions of AS in mortar on the microstructure and shear properties of the mortar-rock interface under F-T cycles. Therefore, F-T cycle testing, nuclear magnetic resonance (NMR) testing and shear testing were carried out on grout with different proportions of AS. The results show that the right proportion of AS replacement could enhance the shear deformation resistance and F-T resistance of the mortar-rock interface, and 30% proportion is the optimal proportion. By increasing of F-T cycles, the three types of specimens showed different degrees of particle spalling, shedding and cracking. The slurry-rock interface layer in the A (0%) group exhibited the most severe F-T deterioration, while the B (15%) group showed a lesser degree, and the C (30%) group performed the best. T2 spectrum curve and total spectrum area change law from the microscopic point of view to verify the 30% AS proportion mortar-rock interface F-T resistance is the strongest, followed by 15% AS proportion mortar, the weakest is ordinary mortar. The degradation of the mortar-rock bond is primarily due to the conversion of solid to liquid phases and the movement of internal water caused by fluctuating temperatures. The extent of F-T deterioration in the slurry-rock interface layer is greatly affected by the varying proportions of AS. The shear strength and shear stiffness of specific proportion of AS decreased with the increase of F-T cycles. For same F-T cycles, the shear strength and shear stiffness of group C (30%) were the highest, followed by group B (15%) and group A (0%). The grout material not only reinforces the F-T joint fissure slope, but also reduces the cost of grout reinforcement and promotes the clean production of geotechnical structures.

show abstract

Effect of nano‐silica on the mechanical performance and porosity evolution of concrete under freezing and thawing cycles

Yang,

Xiao,

Ming

2024

Structural Concrete

View full text Add to dashboard Cite

The enhancement of freeze–thaw resistance in concrete is crucial for improving the durability and longevity of infrastructure in cold regions. Although the benefits of nano‐silica (NS) on concrete's freeze–thaw resistance have been demonstrated, there is still controversy surrounding the optimal concentration of admixture and underlying mechanisms. In this study, the mechanical performance (mass weight, elastic modulus, compressive and splitting strength) and porosity evolution (total porosity, porosity distribution and micro‐surface morphologies) of control concrete and concrete modified with five different NS admixture concentration (1%–5%) were tested under freezing and thawing (F–T) cycles, and damage models were established to assess the correlations between macroscopic and microscopic damages. The results indicate that F–T cycles lead to both damage in mechanic properties and porosity in concrete specimens. The effects of NS particles on macroscopic and microscopic damage under F–T conditions depend on their admixture concentration. A 2% concentration mitigates while a 5% dosage promotes both macroscopic and microscopic damages during F–T cycles. These differences can primarily be attributed to different dispersion status of NS particles in concrete, leading to variations in porosity evolution during F–T cycles. The macroscopic damage exhibit stronger correlation with microscopic damage factor modified by proportion of large pores compared to that only based on total porosity, suggest that the microscopic damage, especially large pores' proportion, contribute to macroscopic damage of concrete specimens under F–T cycles. These findings provide valuable references for field concrete engineering applications in cold areas.

show abstract

Damage degradation model of aeolian sand concrete under freeze–thaw cycles based on macro-microscopic perspective

Cited by 55 publications

References 19 publications

Freeze–Thaw Damage Degradation Model and Life Prediction of Air-Entrained Concrete in Multi-Year Permafrost Zone

Freeze–Thaw Damage Degradation Model and Life Prediction of Air-Entrained Concrete in Multi-Year Permafrost Zone

Microstructure and Shear Mechanical Properties of Fractured Rock Mass Reinforced by Aeolian-Sand (AS) Cement Mortar after Freeze-Thaw (F-T) Cycles

Effect of nano‐silica on the mechanical performance and porosity evolution of concrete under freezing and thawing cycles

Contact Info

Product

Resources

About