Microstructure and Service-Life Prediction Models of Aeolian Sand Concrete Under Freeze–Thaw Damage

Wei, Dong Bin; Ji, Yajing; Zhou, Mengzi

doi:10.1007/s42947-023-00276-0

Cited by 3 publications

(2 citation statements)

References 30 publications

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“…In cold regions, concrete structures are often exposed to low-temperature environments, and freeze-thaw cycles can exacerbate the expansion of initial cracks within concrete and induce the formation of new cracks [6,7]. However, this problem can be alleviated through the incorporation of basalt fibers.…”

Section: Introductionmentioning

confidence: 99%

Research on the Resistance Performance and Damage Deterioration Model of Fiber-Reinforced Gobi Aggregate Concrete

Lei,

Bai,

2024

Materials

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Concrete prepared using Gobi sand and gravel instead of ordinary sand and gravel is referred to as Gobi concrete. In order to explore the effect of fibers on the frost resistance of Gobi concrete, as well as to enhance the service life of Gobi aggregate concrete in Northwest China, experiments were conducted with fiber types (polypropylene fibers, basalt fibers, polypropylene–basalt fibers) and fiber volume fractions (0%, 0.1%, 0.2%, 0.3%) as variable parameters. This study investigated the surface morphology, mass loss rate, and relative dynamic elastic modulus of fiber-reinforced Gobi concrete after different freeze–thaw cycles (0, 25, 50, 75, 100). Corresponding frost damage deterioration models were proposed. The results indicate that fibers have a favorable effect on the anti-peeling performance, mass loss rate, and dynamic elastic modulus of Gobi aggregate concrete. The improvement levels of different fiber types are in the following order: 0.1% basalt-polypropylene fibers, 0.2% polypropylene fibers, and 0.3% basalt fibers. Compared to Gobi concrete exposed to natural environmental conditions, the freeze–thaw cycle numbers increased by 343, 79, and 69 times, respectively. A quadratic polynomial damage model for fiber-reinforced Gobi concrete, using relative dynamic elastic modulus as the damage variable, was established and demonstrated good predictive performance.

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Section: Introductionmentioning

confidence: 99%

Research on the Resistance Performance and Damage Deterioration Model of Fiber-Reinforced Gobi Aggregate Concrete

Lei,

Bai,

2024

Materials

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“…However, most of the research on the mechanical properties under the action of freeze-thaw cycle focus on the static aspect of concrete, and the concrete will be frequently subjected to dynamic loads, such as impact and vibration, during the design service life, and there are a lot of diferences between the mechanical properties and the static loads. Also, the nature of the damage is due to the frost expansion efect of concrete dominated by freeze-thaw action [14], resulting in the further development of internal cracks in concrete and the increase in the degree of damage. In order to reveal the deterioration mechanism of the kinetic properties of concrete materials under the conditions of freeze-thaw cycle, it is necessary to analyze the damage characteristics of concrete under the action of freeze-thaw cycle from a fne perspective.…”

Section: Introductionmentioning

confidence: 99%

Study on the Dynamic Properties of Concrete under Freeze-Thaw Cycles and CT Fine View Damage

Wang,

Zheng,

Xiahou

et al. 2023

Shock and Vibration

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In order to study the dynamic mechanical properties of concrete under freeze-thaw cycles, uniaxial impact compression tests were conducted on concrete specimens with different number of freeze-thaw cycles (0, 25, 50, 75, and 100) using a 50 mm diameter split Hopkinson pressure bar (SHPB) test device at an impact air pressure of 0.4 MPa and combined with a CT scanning system to analyze the internal fissures of concrete specimens before and after freeze-thaw cycles. The results showed the following. (1) The concrete specimens were divided into linear elastic stage, plastic stage, and damage stage under the freeze-thaw cycle, and the macroscopic mechanical parameters of the specimens were weakened with the increase of the number of freeze-thaw cycles. (2) Freeze-thaw intensified the expansion and penetration of the internal fracture of the specimens, and the CT scan results showed that the internal fracture parameters of the concrete specimens were increased with the increase of the number of freeze-thaw cycles, and the structural characteristics of the internal fracture show gradually complex expansion and evolution characteristics. (3) The degree of damage was defined at the fine level, which increased with the number of freeze-thaw cycles, establishing an intrinsic link between the fine deterioration of concrete specimens and the loss of macroscopic parameters under freeze-thaw cycles. The results are of great significance to further elucidate the internal structural characteristics of concrete material damage under freeze-thaw conditions and to reveal the damage deterioration mechanism.

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Study on Pore Structure-Strength Model of Aeolian Sand Concrete Based on Grey Entropy Analysis

Zhang,

Zheng,

Yuan

et al. 2023

Int. J. Pavement Res. Technol.

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Microstructure and Service-Life Prediction Models of Aeolian Sand Concrete Under Freeze–Thaw Damage

Cited by 3 publications

References 30 publications

Research on the Resistance Performance and Damage Deterioration Model of Fiber-Reinforced Gobi Aggregate Concrete

Research on the Resistance Performance and Damage Deterioration Model of Fiber-Reinforced Gobi Aggregate Concrete

Study on the Dynamic Properties of Concrete under Freeze-Thaw Cycles and CT Fine View Damage

Study on Pore Structure-Strength Model of Aeolian Sand Concrete Based on Grey Entropy Analysis

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