Mesoscopic numerical simulation of effective thermal conductivity of tensile cracked concrete

Shen, Lianguan; Ren, Qingwen; Xia, Ning; Sun, Lei; Xia, Xiaozhou

doi:10.1016/j.conbuildmat.2015.07.117

Cited by 50 publications

(9 citation statements)

References 28 publications

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“…This deterioration in residual compressive strengths of HSC and HSM was the result of mineralogical and micro-morphological changes caused by the elevated temperature, and the reasons for this deterioration can be classified into the following three types: (i) Thermal incompatibility. Concrete is usually considered as a three-phase composite material consisting of aggregate, mortar and ITZ between them (Shen et al 2015;Zheng et al 2012). Actually, more phases, including sand, hydrates of cementation, non-hydrated particles and so on, can be divided at meso-and micro-levels.…”

Section: Residual Compressive Strengthmentioning

confidence: 99%

Effect of Elevated Temperature on Meso- and Micro-Structure and Compressive Strength of High-Strength Concrete and Mortar Containing Blast-Furnace Slag

Wang

et al. 2018

ACT

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Meso-and micro-structures and residual compressive strengths of high-strength concrete (HSC) and mortar (HSM) with blast-furnace slag (BFS) replacement ratios of 0%-55% were experimentally obtained after 20°C-800°C, respectively. The results indicated that the meso-crack started to appear after 400°C and grew into the main crack of HSC and the net-like crack of HSM with the increasing temperature. Calcium hydroxide could dehydrate above 400°C and calcium carbonate could decarbonate above 600°C in paste. The micro-morphology of paste became more and more loose from 400°C to 800°C. Residual compressive strengths of HSC and HSM reduced as the temperature rose, except for the strength recovery of HSM after 400°C. The compressive strength of HSC had a reduction with the increasing BFS replacement ratio at 20°C, but HSC with 18% BFS had the highest residual compressive strength above 200°C. An increasing BFS replacement ratio could reduce the residual compressive strength of HSM after the temperatures of 20°C-600°C. Equations for estimating residual compressive strengths of HSC and HSM as well as the relationship between them were proposed with the temperature and the BFS replacement ratio as two primary parameters.

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Section: Residual Compressive Strengthmentioning

confidence: 99%

Effect of Elevated Temperature on Meso- and Micro-Structure and Compressive Strength of High-Strength Concrete and Mortar Containing Blast-Furnace Slag

Wang

et al. 2018

ACT

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“…Carson et al [21] apply Finite Element Method (FEM) to find the conductivity of non-insulated porous of various shapes and sizes, while Tang et al [22] propose a similar modelling for concrete with conductive heterogeneities. Shen et al [23] use a plastic damage model to create cracks under tensile load and then consider steady-state conduction to find the conductivity of the microcracked concrete with high aggregate volume. One can cite also works of Tran et al [14] based on an adaptive scheme Boundary Element Method (BEM) to find conductivity of a domain containing several cracks.…”

Section: Introductionmentioning

confidence: 99%

Steady-state heat transfer in microcracked media

Mahendren

Welemane

Dalverny

et al. 2020

Mechanics & Industry

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Material behaviour is often affected by the heterogeneities existing at the microscopic level. Especially the presence of cracks, voids, etc collectively known as defects, can play a major role in their overall response. Homogenization can be used to study the influence of these heterogeneities and also to estimate the effective properties of a given material. Several research works have been dedicated to determining the elastic behaviour of microcracked media. Yet, thermal properties are not investigated as much. Moreover, the question of unilateral effect (opening/closing of cracks) still remains an important issue. So, this paper aims to provide the effective thermal conductivity of 2D microcracked media with arbitrarily orientated cracks, either open or closed. With the help of Eshelby-like approach, homogenization schemes (dilute and Mori-Tanaka) and bounds (Ponte Castañeda-Willis) are developed to provide the closed-form expressions. In addition, these results are compared to numerical simulations performed based on finite element modelling.

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“…One is to generate the aggregates and pores in a random way such as randomly throwing circles/spheres [1,2,3,4] or polygon/polyhedrons [5,6,7,8], and the other is to directly restructure the internal components of concrete based on the tomography which are obtained from computed tomography (CT) scanning [9,10,11]. In terms of the simulation methods, previous works have proposed many effective numerical methods to research the rebuilt concrete including the traditional finite element method (FEM) with the continuing solid elements [12,13,14,15,16], the lattice model with the lattice elements [17,18,19,20,21], the homogeneous model with the homogenized elements for the heterogeneity of concrete [22,23,24,25,26], and the improved FEM method with cohesive elements [27,28,29,30,31,32,33,34,35]. Besides the aforementioned FEM methods, the discrete element method (DEM) with separated elements such as the particle flow method [36,37,38] and rigid-body-spring method (RBSM) [39,40,41] is also applied in simulation of concrete.…”

Section: Introductionmentioning

confidence: 99%

Fracture Behavior and Energy Analysis of 3D Concrete Mesostructure under Uniaxial Compression

Huang

et al. 2019

Materials

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In order to investigate the fracture behavior of concrete mesostructure and reveal the inner failure mechanisms which are hard to obtain from experiments, we develop a 3D numerical model based on the Voronoi tessellation and cohesive elements. Specifically, the Voronoi tessellation is used to generate the aggregates, and the cohesive elements are applied to the interface transition zone (ITZ) and the potential fracture surfaces in the cement matrix. Meanwhile, the mechanical behavior of the fracture surfaces is described by a modified constitutive which considers the slips and friction between fracture surfaces. Through comparing with the experiments, the simulated results show that our model can accurately characterize the fracture pattern, fracture propagation path, and mechanical behaviors of concrete. In addition, we found that the friction on the loading surfaces has a significant effect on the fracture pattern and the strength of concrete. The specimens with low-friction loading surfaces are crushed into separate fragments whereas those with high-friction loading surfaces still remain relatively complete. Also, the strength of concrete decreases with the increase of the specimen height in the high friction-loading surfaces condition. Further, the energy analysis was applied to estimate the restraint impact of loading surfaces restraint on the compressive strength of concrete. It shows that the proportion of the friction work increases with the increase of the restraint degree of loading surfaces, which finally causes a higher compressive strength. Generally, based on the proposed model, we can characterize the complicated fracture behavior of concrete mesostructure, and estimate the inner fracture mode through extracting and analyzing the energies inside the cohesive elements.

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Mesoscopic numerical simulation of effective thermal conductivity of tensile cracked concrete

Cited by 50 publications

References 28 publications

Effect of Elevated Temperature on Meso- and Micro-Structure and Compressive Strength of High-Strength Concrete and Mortar Containing Blast-Furnace Slag

Effect of Elevated Temperature on Meso- and Micro-Structure and Compressive Strength of High-Strength Concrete and Mortar Containing Blast-Furnace Slag

Steady-state heat transfer in microcracked media

Fracture Behavior and Energy Analysis of 3D Concrete Mesostructure under Uniaxial Compression

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