Aggregate effect on the mechanical and fracture behaviours of concrete

Zhao, Hongwei; Zhang, Liangchi; Wu, Zhonghuai; Liu, Ang; Imran, Muhammad

doi:10.1016/j.ijmecsci.2022.108067

Cited by 17 publications

(3 citation statements)

References 59 publications

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“…Over the last 200 years, the rapid development of urbanization has been closely related to the widespread use of concrete [ 14 ]. Concrete is a cementitious material made by mixing cement, sand, stone, water and the required admixtures in certain proportions, followed by compacting and curing under defined conditions [ 15 ]. Sand and stones serve as the aggregate and skeleton, respectively, in concrete constructions [ 16 ].…”

Section: Concretementioning

confidence: 99%

Review on Microbially Influenced Concrete Corrosion

et al. 2023

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Microbially influenced concrete corrosion (MICC) causes substantial financial losses to modern societies. Concrete corrosion with various environmental factors has been studied extensively over several decades. With the enhancement of public awareness on the environmental and economic impacts of microbial corrosion, MICC draws increasingly public attention. In this review, the roles of various microbial communities on MICC and corresponding protective measures against MICC are described. Also, the current status and research methodology of MICC are discussed. Thus, this review aims at providing insight into MICC and its mechanisms as well as the development of protection possibilities.

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Section: Concretementioning

confidence: 99%

Review on Microbially Influenced Concrete Corrosion

et al. 2023

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“…This framework was originally applied to Li-ion batteries, where high discharge rates cause higher voltage drops, and therefore more quickly attains the cut-off voltage, below which the battery cannot be operated [29,30]. The same framework has recently been adapted and applied to phase-change thermal energy storage [31,32,33,34,35,36]. However, the thermochemical salt hydrate community has only recently begun reporting power densities at specific points during discharge based on experiments at the materials-scale (≤ 1 g of materials tested) [22,37,38].…”

Section: Introductionmentioning

confidence: 99%

Modeling and Experimental Demonstrations Reveal Ragone Framework for Salt Hydrate Thermochemical Energy Storage

Kinzer,

Ghosh,

Crowley

et al. 2024

Preprint

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Salt hydrates offer the dual potential of high energy densities and low material costs for building heating applications. Heat is released and consumed with uptake and release of water (vapor) respectively by the salt without dissolution. However, the adoption of salt hydrate reactors is hindered by the limited knowledge on how power and energy tradeoffs translate from the materials to the reactor scale. Our study addresses this knowledge gap with integrated modeling and measurements, focusing on a packed bed reactor with SrBr2 vermiculite composite particles. Results reveal a mass transport limited regime producing steady, low power with larger energy capacity utilization, and a kinetics limited regime offering high, but variable power and smaller energy capacity utilization. We use a modified Damkohler number to predict the specific power and performance limiting factors, with knowledge of the inlet state, materials-specific kinetics and thermodynamics, and reactor design/operating conditions. Comparison between the reactor-scale (100 g) with the material-scale (1 g) test using SrBr2 vermiculite composite highlights that the kinetics and specific power decreases nearly tenfold from 35 W/kg to 3.9 W/kg at full discharge, likely due to the larger temperature and morphological variations at the larger scale. These discrepancies emphasize the need for improved characterization of composite materials’ temperature-dependent kinetics, equilibrium vapor pressure, and structural/morphological changes associated with water vapor uptake and release. Our research enhances the understanding of salt hydrate performance from materials to reactors, applies the Ragone framework to contextualize and benchmark against other energy storage materials, and suggests strategies for performance improvement.

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“…The role of aggregates in affecting concrete mechanical properties and durability has been object of deep study [7,8]. Aggregate sieving is also investigated in relation to drying shrinkage, and fracture behaviors [9,10]. Regarding the influence of the aggregate grading curve on concrete shielding performance, it is reported that an optimum sieving can increase the material shielding properties, as a result of a reduced porosity [11].…”

Section: Introductionmentioning

confidence: 99%

On the effects of aggregate sievingin the shielding and thermo-mechanical performance of concrete

Zhang,

Pomaro,

Mazzucco

et al.

Proceedings of the Seventeenth International Conference On Civil, Structural and Environmental Engineering Computing

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In this paper, the influence of aggregate sieving and distribution on the shielding performance of concrete against nuclear radiation is investigated numerically. A thermomechanical and neutron diffusion coupled numerical formulation is proposed to address the specific problem related to irradiated concrete. This model solves the multiphysics problem by combining a two-group neutron diffusion theory, with the thermal conduction equation adapted to the radiation condition, and the mechanical equilibrium problem. Concrete is modeled at the mesoscale as a two-phase material, comprising mortar matrix and aggregates. Three grading curves of Fuller type are simulated, different for the nominal diameter size intervals of the polyhedral aggregates, which are randomly distributed within cubic samples of concrete composite material. A boron-rich material, colemanite, is utilized as aggregate in the numerical simulations. The results show that the fast neutron flux is not much influenced by the variation of the grading curves. On the other hand, a slight variation of the coarse aggregate volume fraction is found to affect to some extent the thermal flux. As regards temperature and stress distribution, it is noted the barrier effects that the inclusions bring to the state variable diffusion process.

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Aggregate effect on the mechanical and fracture behaviours of concrete

Cited by 17 publications

References 59 publications

Review on Microbially Influenced Concrete Corrosion

Review on Microbially Influenced Concrete Corrosion

Modeling and Experimental Demonstrations Reveal Ragone Framework for Salt Hydrate Thermochemical Energy Storage

On the effects of aggregate sievingin the shielding and thermo-mechanical performance of concrete

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