Mesoscopic study on fracture behavior of fully graded concrete under uniaxial tension by using the phase-field method

Guo, Jinjun; Lin, Weiqi; Qin, Xiangnan; Xu, Yaoqun; Dong, Kang

doi:10.1016/j.engfracmech.2022.108678

Cited by 9 publications

(4 citation statements)

References 58 publications

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“…The work of Loeffler et al [5] has been instrumental in identifying how different durations of loading affect the initiation of damage within HPC, shedding light on the sensitivity of these materials to varied stress durations. Simultaneously, research by Ukpata et al [6] have explored how aggregates affect HPC's durability, while Guo et al [7] investigated fracture mechanics under cyclic loads using the phase-field method. Efforts by Yehia et al [8] to analyse the impacts of aggregate composition and concrete strength have led to improvements in HPC's performance.…”

Section: Introductionmentioning

confidence: 99%

Emphasis of Cyclic Loading on the Fracture Mechanism and Residual Fracture Toughness of High-Performance Concrete Considering the Morphological Properties of Aggregate

Basutkar,

Leusmann,

Lowke

2024

Construction Materials

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This research investigates the fatigue behaviour and fracture mechanics of high-performance concrete (HPC), including various compositions such as HPC with basalt aggregates (HPC-B), HPC with gravel (HPC-G), and high-strength coarse mortar (CM) under static and cyclic tensile loading within the special priority program SPP 2020. The study aims to integrate fracture mechanics into structural analysis to enhance design guidelines for slender cross-sections and safety-related high-performance structural components. The experimental investigations reveal HPC-B’s remarkable superiority, displaying its higher compressive strength, modulus of elasticity, and tensile strength compared to HPC-G and CM. A modified disk-shaped compact tension (MDCT) based on ASTM standards, aided by digital image correlation (DIC) unveils fracture behaviour, emphasizing fracture energy as a crucial parameter. HPC-B exhibits improved crack resistance and notch sensitivity reduction attributed to crushed basalt aggregates and an enhanced interfacial transition zone (ITZ). The research scrutinizes factors like material characterization, aggregate morphology, stress levels, and the displacement rate on crack formation. High-cycle fatigue tests show HPC-B’s superior performance, and the post-fatigue analysis reveals enhanced residual fracture toughness attributed to nano-level structural changes, stress redistribution and aggregate-matrix interaction. A 3D image analysis via Computed Tomography (CT) scans captures mesostructural crack propagation and provide quantitative insights. This research marks a significant shift from conventional aggregate-focused approaches and introduces a novel approach by integrating excess paste theory and mesoscale analysis, highlighting the critical role of aggregate choice in material characterization and mesoscale design in enhancing the structural efficiency of HPC. Furthermore, the study advances the understanding of HPC fatigue behaviour, emphasizing the interplay of aggregate types and morphologies and their dynamic response to cyclic loading, offering valuable insights for optimizing design guidelines and fostering innovation in structural engineering.

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Section: Introductionmentioning

confidence: 99%

Emphasis of Cyclic Loading on the Fracture Mechanism and Residual Fracture Toughness of High-Performance Concrete Considering the Morphological Properties of Aggregate

Basutkar,

Leusmann,

Lowke

2024

Construction Materials

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“…Fully-graded concrete is a widely used complex nonhomogeneous material in the construction of water conservancy infrastructure-such as gravity dams and arch dams-which consists of cement, aggregate, water and admixture. Compared to conventional concrete particle size, the aggregate size of fully-graded concrete can be up to 150 mm [1]. Concrete has good compressive properties; however, fully-graded concrete structures in real environments are often under multiaxial stresses.…”

Section: Introductionmentioning

confidence: 99%

“…Qin et al [28] used a method that considers the randomness of aggregate geometry and spatial distribution in real engineering to investigate the mesoscopic fracture behavior of fully-graded concrete. Guo et al [1] investigated the applicability and rationality of the phase field method in the mesoscopic study of fully-graded concrete under uniaxial tension. Xu et al [29] developed a mesoscale fracture simulation method for fully-graded concrete.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Study on the Constitutive Model of Fully-Graded Concrete Based on Statistical Damage Theory

Yuan,

Li,

Huang

et al. 2023

Buildings

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A statistical damage model (SDM) of fully-graded concrete was created using statistical damage theory, based on the mechanical properties of axial tension and axial compression of the material. The SDM considers two damage modes, fracture and yield, and explains the intrinsic connection between the mesoscopic damage evolution mechanism and the macroscopic nonlinear mechanical behavior of fully-graded concrete. The artificial bee colony (ABC) algorithm was used to obtain the optimal parameter combination through an intelligent search of parameters εa, εh, εb and H in the constitutive model by taking the test data as the target value, and the sum of the squares of the differences between the target value and the predicted value as the objective function. The SDM numerical simulation model of fully-graded concrete is proposed by compiling subroutines in FORTRAN by constructing two modules of data model and damage analysis. The numerical results under uniaxial and biaxial forces are in agreement with the experimental results, which verifies the accuracy of the program. The model also analyzes the characteristics of mesoscopic damage evolution and predicts the mechanical properties under triaxial forces. The results show that the proposed numerical simulation model can reflect the salient features for fully-graded concrete under uniaxial, biaxial and triaxial loading conditions, and the evolution law of mesoscopic parameters. Therefore, the proposed model serves as a basis for the refined finite element analysis of hydraulic fully-graded concrete structures and reveals the mesoscopic damage mechanism of concrete under different load environments.

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“…The authors concluded that the compressive strength was proportionally increased to the bottom of the structures. Guo, Lin, Qin, Xu, and Dong (2022) numerically studied the tension behavior of fully-graded concrete specimens under uniaxial load. The mesoscopic models were investigated by using the phase-filed method.…”

Section: Introductionmentioning

confidence: 99%

3D numerical investigation of functionally graded concrete

Hau

Cuong-Le

2023

HCMCOUJS - ENGINEERING AND TECHNOLOGY

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In the design of engineering structures, concrete is assumed to have homogeneously mechanical properties. However, in reality, the concrete material is usually not uniform with respect to the height of structures because segregation mostly occurs during construction. The higher density is presented at, the lower part of the structure due to a higher proportion of aggregate and vice versa. Moreover, the disparity of creep, shrinkage, hydration heat, and curing method also leads to the difference in the quality of concrete. Therefore, it is necessary to study the responses of a concrete element with various mechanical properties. In this study, the functional elastic modulus of concrete material (FGC) is investigated numerically for its effects on the static responses of the element under axial compression. Conventional Finite Element Method (FEM) and Meshless method are used to model the structure. The reliability of the numerical model is validated by comparing the obtained results with experimental data.

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Mesoscopic study on fracture behavior of fully graded concrete under uniaxial tension by using the phase-field method

Cited by 9 publications

References 58 publications

Emphasis of Cyclic Loading on the Fracture Mechanism and Residual Fracture Toughness of High-Performance Concrete Considering the Morphological Properties of Aggregate

Emphasis of Cyclic Loading on the Fracture Mechanism and Residual Fracture Toughness of High-Performance Concrete Considering the Morphological Properties of Aggregate

Numerical Simulation Study on the Constitutive Model of Fully-Graded Concrete Based on Statistical Damage Theory

3D numerical investigation of functionally graded concrete

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