The Tensile Strength and Damage Characteristic of Two Types of Concrete and Their Interface

Shen, Qingchuan; Chen, Wei; Liu, Chao; Zou, Wenjie; Pan, Liufeng

doi:10.3390/ma13010016

Cited by 14 publications

(9 citation statements)

References 26 publications

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“…The materials and mix properties used in preparing the concrete related to the experimental part of this paper were as shown in Table 1 [ 28 ].…”

Section: Uniaxial and Shear Testsmentioning

confidence: 99%

Analysis on Damage and Mechanical Properties of Ballastless Track in a Tunnel after a Fire

Chen

et al. 2022

Materials

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In order to explore the damage and mechanical properties of ballastless track after a fire, the uniaxial compressive strength, shear strength, peak strain, and elastic modulus changes due to temperature were obtained through uniaxial compressive and shear tests of concrete after exposure to high temperatures. The test results showed that with increases in temperature, the uniaxial compressive strength, shear strength, and elastic modulus of concrete all presented a decreasing trend, while the peak strain had an increasing trend. Then, based on the classical damage theory model and the strength probability distribution function of concrete micro-units, the high-temperature damage constitutive equation for concrete was established, and the compressive stress–strain curve of concrete after exposure to high temperature was reproduced. Finally, using the CFD numerical simulation software, the temperature field of a ballastless track structure in a tunnel during a fire was obtained, and the temperatures at different positions of ballastless track bed were acquired. Combined with the high-temperature damage constitutive equation for concrete deduced from tests and theoretical analysis, the strength and damage values of the ballastless track bed at different positions after a tunnel fire were obtained.

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“…The materials and mix properties used in preparing the concrete related to the experimental part of this paper were as shown in Table 1 [ 28 ].…”

Section: Uniaxial and Shear Testsmentioning

confidence: 99%

Analysis on Damage and Mechanical Properties of Ballastless Track in a Tunnel after a Fire

Chen

et al. 2022

Materials

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“…The difference from the cracking pattern of conventional materials is mainly due to the fact that the rock-shotcrete interface is affected by the differential mechanical properties of the two materials. There will be stress concentration at the loading point, 9,25 and the microcracks in the center of the specimen are in an unstable state. With the increase of the loading rate, the discreteness of the crack positions of the rockshotcrete improves.…”

Section: Effect Of Different Loading Rates On Cracking Patternsmentioning

confidence: 99%

“…Qin found in the research that due to the existence of the composite interface of the two materials, even if the geometry and load of the sample are symmetrical, the stress state will be asymmetrically distributed. 25 Under the action of external load and internal stress, dynamic damage evolution processes such as microcrack initiation, crack development, and crack aggregation will occur inside the structure. The study of the interaction process and damage process of medium bodies must rely on real-time monitoring techniques.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of rock–shotcrete interface damage under dynamic splitting using digital image correlation and acoustic emission

Chen

et al. 2022

Structural Concrete

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Interface failure is the main type of rock–concrete structure failure, which affects the stability and safety. To study the interface crack propagation and damage characteristics, this article carried out the rock–shotcrete cube interface splitting test under different loading rates. The rock–shotcrete specimens are composed of four material types. Based on the nondestructive monitoring technology, digital image correlation and acoustic emission (AE) were used to monitor the whole process of splitting failure. The results indicate that, both peak load and critical displacement exhibit significant strain rate effects. The main stage of interfacial microcrack development is between 0.8 Pmax and Pmax. And the damage evolution of cracks is more sufficient and stable under low loading rate. The splitting damage at the rock–shotcrete interface shows phased characteristics. When the load is near the peak, the surge of the AE signal indicates that the damage is intensified.

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“…e normal cohesive parameters used in most simulations are obtained from splitting tensile test [13][14][15][16]. In the splitting tensile test, the normal cohesive parameters are determined based on the normal strain at several specific points.…”

Section: Introductionmentioning

confidence: 99%

Push Plate Test of CRTS II Slab Ballastless Track: Theoretical Analysis, Experiments, and Numerical Simulation

Liu

Sun

et al. 2021

Shock and Vibration

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Push plate test is a powerful tool to evaluate the interfacial bond performance of China railway track structure type-II slab ballastless track structure (CRTS II SBTS). However, there is still a lack of theoretical explanation of the push plate test. In this paper, a linear proportional distribution method is proposed in terms of a series of analytical formulas to describe the interfacial force-displacement variation of CRTS II SBTS in different damage stages of the horizontal push plate test. The force-displacement relationship established by the linear proportional distribution method agrees well with that observed in full-scale test. The horizontal push plate test is then simulated, in which a bilinear cohesive zone model (CZM) was adopted to simulate the interface within track structure. The parameters of the CZM are calculated based on the force-displacement curves obtained from scale push plate test. Particularly, the normal cohesive parameters are determined based on the scale vertical push plate test instead of the traditional splitting tensile test. The simulation proves that both the maximum affected length in the undamage stage and the maximum damaged length in the damage stage depend rather on the interfacial stiffness and the material parameters of SBTS than the horizontal load. These two lengths given by the simulation are close to those defined by the proposed linear proportional distribution method. This indicates the reliability of the proposed method and the capability of scale push plate test in determining cohesive parameters.

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The Tensile Strength and Damage Characteristic of Two Types of Concrete and Their Interface

Cited by 14 publications

References 26 publications

Analysis on Damage and Mechanical Properties of Ballastless Track in a Tunnel after a Fire

Analysis on Damage and Mechanical Properties of Ballastless Track in a Tunnel after a Fire

Experimental investigation of rock–shotcrete interface damage under dynamic splitting using digital image correlation and acoustic emission

Push Plate Test of CRTS II Slab Ballastless Track: Theoretical Analysis, Experiments, and Numerical Simulation

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