Experimental investigation of the Rock–Concrete bi materials influence of inclined interface on strength and failure behavior

Selçuk, Levent; Aşma, Derya

doi:10.1016/j.ijrmms.2019.104119

Cited by 67 publications

(16 citation statements)

References 30 publications

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“…In addition, the dynamic splitting tensile strength of the bimaterial composites shows a tendency to increase with the increase of the interface inclination angle. It is consistent with the phenomenon observed by other scholars 23,26 . This is mainly due to the fact that when the angle of incidence is 0°, the main fracture surface of the specimen occurs at the interfacial transition zone between rock and concrete.…”

Section: Results and Analysissupporting

confidence: 92%

“…It is consistent with the phenomenon observed by other scholars. 23,26 This is mainly due to the fact that when the angle of incidence is 0 , the main fracture surface of the specimen occurs at the interfacial transition zone between rock and concrete. The micro-cracks are easy to form at the interface because of chemical shrinkage and shrinkage of water loss.…”

Section: Splitting Tensile Strength With Different Interface Inclinat...mentioning

confidence: 99%

“…22 In order to advance the progress of research on the mechanical properties of rock-concrete composite structures at different interface inclinations, some scholars [23][24][25] conducted a more comprehensive experimental study of the interface properties by using high-speed cameras, digital image correlation (DIC), and 3D laser scanning techniques. Selcuk and Asma 26 investigated the effects of tilted interface on the strength and damage behavior of rock-concrete specimens under uniaxial compression (UCS), splitting tension (ST), and point loading (PLS) conditions and pointed out that ST and PLS can be used as alternative methods to evaluate the fracture performance of rock-concrete specimens.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic splitting tensile behavior of rock–concrete bimaterial disc with multiple material types under different interface inclination angle

Chen

Feng

et al. 2022

Fatigue Fract Eng Mat Struct

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The experimental investigation on the dynamic mechanical properties and failure behavior of rock–concrete composite is of great significance for understanding the mechanical response of rock–shotcrete supporting structures. In the paper, impact splitting tests were performed on Brazilian disc specimens of the rock–concrete bimaterial with different interface inclination angles. Effects of interface inclination angle and material type on dynamic response and failure behavior under dynamic impact were analyzed experimentally. The results show that the dynamic splitting strength and energy dissipation ratio increase with the increase of interface inclination angle. However, the incorporation of fibers will reduce the splitting tensile strength. The crack‐resisting effect of sandstone–fiber concrete is more obvious, and the hysteresis plateau phenomenon appears in the post‐peak section of the stress‐time curve. The interface failure behavior is related to the stress state of the interface and can be divided into three patterns: tensile fracture, shear fracture, and interface non‐ fracture.

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Section: Results and Analysissupporting

confidence: 92%

Section: Splitting Tensile Strength With Different Interface Inclinat...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dynamic splitting tensile behavior of rock–concrete bimaterial disc with multiple material types under different interface inclination angle

Chen

Feng

et al. 2022

Fatigue Fract Eng Mat Struct

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“…Concrete interface is the weak link of the concrete specimens, and the interface between cement matrix and aggregate directly affects the mechanical properties and durability of concrete [22,23,24]. Scanning electron microscope was performed to study the effect of steel fibers and MgO expansion agent on the interface.…”

Section: Resultsmentioning

confidence: 99%

Deformation and Compressive Strength of Steel Fiber Reinforced MgO Concrete

Jiang

Mao²,

Deng³

et al. 2019

Materials

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To reduce the cracking caused by shrinkage and avoid the brittle behavior of concrete, MgO expansion agent and steel fibers were used in this paper. Firstly, the effect of MgO and steel fibers on the compressive strength of concrete was compared. The results showed that the compressive strength of steel fibers reinforced concrete (SC) and steel fiber reinforced MgO concrete (SMC) was significantly improved. Compared with ordinary concrete (OC), SMC’s 28 days compressive strength increased by 19.8%. Secondly, the influence of MgO and steel fibers with different contents on the self-volumetric deformation of concrete was compared through the experiment. The results showed that as a result of the hydration expansion of MgO, MC and SMC both showed obvious expansion, and their 190 days expansion was 335 με and 288 με, respectively. Lastly, through a scanning electron microscope (SEM) test, it was found that the constraint effect of steel fibers changed the expansion mode of MgO from outward expansion to inward extrusion, thus improving the interfacial bond strength of concrete.

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“…For a concrete gravity dam, the interface between the rock foundation and the dam body is a weak link in terms of the structural load-carrying capacity due to its weak bonding behavior (Kishen and Saouma 2004). To ensure normal operations of concrete gravity dams, many efforts have been made to explore the mechanical and fracture properties of rock-concrete interfaces, mainly under quasi-static loading conditions (Chang et al 2020;Selcuk and Asma 2019;Tian et al 2015;Yuan et al 2021). In practical construction engineering, concrete gravity dams suffer from the long-term loading of water pressure over most of their service periods, leading to the time-dependent mechanical responses at the interface (Dong et al 2022).…”

Section: Introductionmentioning

confidence: 99%

Time-Dependent Fracture Behavior of Rock–Concrete Interface Coupling Viscoelasticity and Cohesive Stress Relaxation

et al. 2023

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This study investigated the time-dependent crack propagation of the rock-concrete interface under sustained loading. First, sustained loading tests were performed on the composite rock-concrete beams under three-point bending with respect to three interface roughness degrees, i.e. natural, 4 × 4 and 7 × 7 interfaces, and three sustained load levels, i.e. 80% of the maximum load, the initial cracking load and 97% of the maximum load. Then, by employing the Bailey-Norton model and the time-dependent fictitious crack model, the constitutive relationships of bilateral materials and the rock-concrete interface were established and the mechanical responses of the rock-concrete interface under sustained loading were simulated. In addition, a crack propagation criterion proposed in this study was applied in the numerical procedure to simulate the time-dependent crack propagation process under sustained loading. The criterion implied that the interface crack propagated when the difference between the average elastic strain energy densities near the crack tip caused by the external load and cohesive stress exceeded that at the initial fracture status under quasi-static loading. The results indicated that the crack propagation under sustained loading could be interpreted from the view of energy balance between the driving energy from the external load and the resistance energy from the cohesive stress. The time-dependent crack propagation under sustained loading experienced three stages, i.e. decelerated propagation, uniform propagation, and accelerated propagation. A linear relationship between the logarithms of the crack mouth opening rate in the uniform propagation period and the failure time was established to predict the failure time of the rock-concrete interface under sustained loading.

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Experimental investigation of the Rock–Concrete bi materials influence of inclined interface on strength and failure behavior

Cited by 67 publications

References 30 publications

Dynamic splitting tensile behavior of rock–concrete bimaterial disc with multiple material types under different interface inclination angle

Dynamic splitting tensile behavior of rock–concrete bimaterial disc with multiple material types under different interface inclination angle

Deformation and Compressive Strength of Steel Fiber Reinforced MgO Concrete

Time-Dependent Fracture Behavior of Rock–Concrete Interface Coupling Viscoelasticity and Cohesive Stress Relaxation

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