Behavior of meso-scale heterogeneous concrete under uniaxial tensile and compressive loadings

Chen, Hongbing; Xu, Bin; Mo, Y. L.; Zhou, Tianmin

doi:10.1016/j.conbuildmat.2018.05.052

Cited by 142 publications

(55 citation statements)

References 25 publications

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“…4. This finding broadly supports the work of other studies in this area [6]. In addition, The relationship between the compressive strength and the fractal dimension represented a strong negative correlation.…”

Section: Compressive Strengthsupporting

confidence: 91%

“…For instance, the computed tomographic scanning techniques could be performed to study concrete crack generation, propagation, and failure under compression [5]. It has been demonstrated that the coarse aggregate content could influence the strength [6,7], the elastic modulus [8][9][10], the chloride diffusivity [11,12], etc. The spatial distribution of aggregates was observed to influence the stress state of localized areas [13] and the fracture energy [14].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Fractal Dimension in Concrete Meso-Structure on Its Axial Mechanical Behavior: A Numerical Case Study

Dai

et al. 2021

Fractals

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The numerical meso-modeling method is a powerful tool for simulating concrete and studying the influence of the geometric form of meso-structure on its mechanical behavior. It is still uncertain regarding how to most effectively characterize the geometric form of the concrete meso-structure and its effect on the observed macro behavior. In this study, the fractal dimension of cement paste was used to describe the geometric form of concrete at the meso-level. A group of meso-models of concrete with various fractal dimensions and coarse aggregate contents were simulated using the Random Fractal Modeling method, and the numerical results under compression and tension were studied and discussed. The simulation results suggested that the compressive initial modulus, the compressive strength decreased, the strain corresponding to the maximum compressive stress decreased with increasing fractal dimension. However, the fractal dimension did not influence the tensile initial modulus, the tensile strength, and the strain corresponding to the maximum tensile stress obviously. The comprehensive consideration of the fractal characterize can provide a reasonable tool for understanding and predicting the observed macroscopic behavior of concrete.

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Section: Compressive Strengthsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Effect of Fractal Dimension in Concrete Meso-Structure on Its Axial Mechanical Behavior: A Numerical Case Study

Dai

et al. 2021

Fractals

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show abstract

“…Concrete is a heterogeneous composite material and can be treated as a tri-phase composite structure composed of aggregates, mortar matrix, and the interfacial transition zones (ITZs) between the two former phases at a mesoscopic scale [32,33]. In the present study, only the coarse aggregate was explicitly modeled while the fine aggregates and the pores as well as the initial defects were assumed to be contained in the mortar for simplicity.…”

Section: Mesoscopic Geometry Model Of Rc Beamsmentioning

confidence: 99%

Impact resistance of RC beams under different combinations of mass and velocity: mesoscale numerical analysis

Jin

Lan

Zhang

et al. 2020

Archiv.Civ.Mech.Eng

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The concrete structures under impact loading duress may be destroyed within an extremely short period of time. The importance and complexity of exploration on the impact resistance of concrete members make this area still open for discussion. In the present study, a 3-D mesoscale numerical model was established to investigate the effect of the combination of impact mass and velocity on the mechanical behavior of reinforced concrete (RC) beams subjected to impact loadings. Heterogeneity of concrete and strain rate effects of concrete and steel bars were taken into account. Furthermore, nonlinear interaction between the concrete and steel bars was considered herein. Results from macroscale and mesoscale simulation were compared with the available physical tests, indicating that the mesoscale numerical model can better represent the influence of heterogeneity of concrete on the mechanical behavior of RC beams. Five different impact energy levels were involved to study the effect of the combination of impact mass and velocity on the impact resistance of RC beams. At last, the residual bearing capacity and natural frequency of impacted RC beams were numerically calculated and their relationship was discussed. It is indicated that the deformation of RC beams is influenced strongly by the impulse, which increases with the increasing impact mass at identical impact energy. Besides, the failure mode of RC beams turns from shear-dominant failure mode to bending shear failure mode with the increase of impact mass, accompanied by the increase of energy dissipation of steel bars and the whole member. Despite this, in the present work, the combination of the impact mass and velocity had little influence on the damage extent (based on the performance) of the RC beams. Moreover, an empirical relationship between the residual bearing capacity and the natural frequency of the impacted RC beams was established as a rough reference for damage evaluation in engineering practice.

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“…Zhou et al [ 13 ] investigated the influence of aggregate shape on concrete mechanical properties. Chen et al [ 14 ] studied the influence of both distribution and geometrical shape of aggregates using 2D planar models. As the weakest link in concrete, it has been recognized that ITZ plays an important role in the macroproperties of concrete because of its higher porosity, lower elastic modulus, and lower tensile strength compared with mortar [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

3D Mesoscale Finite Element Modelling of Concrete under Uniaxial Loadings

et al. 2020

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Concrete exhibits a complex mechanical behavior, especially when approaching failure. Its behavior is governed by the interaction of the heterogeneous structures of the material at the first level of observation below the homogeneous continuum, i.e., at the mesoscale. Concrete is assumed to be a three-phase composite of coarse aggregates, mortar, and the interfacial transitional zone (ITZ) between them. Finite element modeling on a mesoscale requires appropriate meshes that discretize the three concrete components. As the weakest link in concrete, ITZ plays an important role. However, meshing ITZ is a challenging issue, due to its very reduced thickness. Representing ITZ with solid elements of such reduced size would produce very expensive finite element meshes. An alternative is to represent ITZ as zero-thickness interface elements. This work adopts interface elements for ITZ. Damage plasticity model is adopted to describe the softening behavior of mortar in compression, while cohesive fractures describe the cracking process. Numerical experiments are presented. First example deals with the estimation of concrete Young’s modulus. Experimental tests were performed to support the numerical test. A second experiment simulates a uniaxial compression test and last experiment simulates a uniaxial tensile test, where results are compared to data from the literature.

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Behavior of meso-scale heterogeneous concrete under uniaxial tensile and compressive loadings

Cited by 142 publications

References 25 publications

Effect of Fractal Dimension in Concrete Meso-Structure on Its Axial Mechanical Behavior: A Numerical Case Study

Effect of Fractal Dimension in Concrete Meso-Structure on Its Axial Mechanical Behavior: A Numerical Case Study

Impact resistance of RC beams under different combinations of mass and velocity: mesoscale numerical analysis

3D Mesoscale Finite Element Modelling of Concrete under Uniaxial Loadings

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