Jan 01, 2019 Most meso-structural models for conventional concrete assume the material to consist in three phases, whereas the models for recycled concrete aggregate envisage five. Peak stress is located in the ITZ, formation site of the microcracks that subsequently propagate across the

Get PriceMay 01, 2018 To realistically model a concrete sample [ 44, 45 ], made with NAs and RCAs at the meso-scale level, a laser scanner has been used to get a digital 3D representation of the external geometry of a few single samples of aggregates from recycled concrete. This technology is ideal for the measurement and inspection of contoured surfaces and complex ...

Get PriceMesoscale Modelling of Concrete with Recycled Aggregates ... description of concrete at the meso-level can be appreciated; then, creep of cement paste and ITZ allows to incorporate in the model ...

Get PriceAug 01, 2021 In this paper, we present two non-local mechanics models of recycled coarse aggregate (RCA) concrete based on peridynamics modeling and simulation, i.e. RCA model 1 and RCA model 2. The recycled coarse aggregate concrete is a heterogeneous composite that has five different phases including natural coarse aggregate, old interfacial transition ...

Get PriceFeb 01, 2021 This paper presents a meso-scale modelling framework to investigate the fracture process in concrete subjected to uniaxial and biaxial compression accounting for its mesostructural characteristics. 3D mesostructure of concrete consisting of coarse aggregates, mortar and interfacial transition zone between them was developed using an in-house code based on the Voronoi

Get PriceIn this paper, we present two non-local mechanics models of recycled coarse aggregate (RCA) concrete based on peridynamics modeling and simulation, i.e. RCA model 1 and RCA model 2.

Get PriceMay 01, 2018 To realistically model a concrete sample [ 44, 45 ], made with NAs and RCAs at the meso-scale level, a laser scanner has been used to get a digital 3D representation of the external geometry of a few single samples of aggregates from recycled concrete. This technology is ideal for the measurement and inspection of contoured surfaces and complex ...

Get PriceRequest PDF Elastoplastic-damaged meso-scale modelling of concrete with recycled aggregates The use of recycled concrete aggregates is very attractive from the point of view of reducing ...

Get PriceIn this paper, we present two non-local mechanics models of recycled coarse aggregate (RCA) concrete based on peridynamics modeling and simulation, i.e. RCA model 1 and RCA model 2.

Get PriceThis paper is focused on developing meso-level finite element model of recycled concrete. Based on the existed researching findings and the Fuller curve, the constitution of aggregate can be determined. Using the Monte Carlo method (MC) to place the aggregate, the meso sample of RC can be developed randomly and the graded mesh

Get PriceMay 12, 2021 The 3-D base force element method (BFEM) for damage problems is proposed, which is applied to analyze the damage mechanism of recycled aggregate concrete (RAC). A piecewise curve damage constitutive model is given to simulate the constitutive relationships of RAC phases.

Get PriceIn this paper, the base force element method (BFEM) for dynamic damage problems is proposed. And the BFEM model was applied to investigate the dynamic mechanical behavior of recycled aggregate conc...

Get PriceA novel mesoscale model considering meso-structural characteristic of aggregate Significance Concrete is widely used in the building and construction industry owing to its excellent properties.

Get PriceGenerating random aggregate models (RAMs) plays a key role in the mesoscopic modelling of concrete-like composite materials. The arbitrary geometry, wide gradation, and high volume ratio of aggregates pose a great challenge for fast and efficient numerical construction of concrete meso-structures. This paper presents a simple strategy for generating RAMs of concrete based on Laguerre ...

Get Price1. ITZ thickness has a pronounced effect on the concrete tensile. behaviour – when thickness is varied from 0.05 (ITZ real thick-. ness) to 1 mm the tensile strength is reduced by about 26% ...

Get PriceThis paper investigates the failure processes of recycled aggregate concrete by a model test and numerical simulations. A micromechanical numerical modeling approach to simulate the progressive cracking behavior of the modeled recycled aggregate concrete, considering its actual meso-structures, is established based on the discrete element method (DEM).

Get PriceIn order to model the meso-scale structure of concrete, a ran- domaggregate generation and packing program is developed while H. Chen et al./Construction and Building Materials 178 (2018) 418 ...

Get PriceUnderstanding variability in recycled aggregate concrete mechanical properties through numerical simulation and statistical evaluation ... localizations were observed near the aggregate boundaries due to large material stiffness discontinuities in the RAC meso-level structure. ... Finite element modeling, Material stiffness, Mechanical ...

Get PriceOct 12, 2012 An aggregate generation and packing algorithm based on Monte-Carlo method is developed to express the aggregate random distribution in cement concrete. A mesoscale model is proposed on the basis of the algorithm. In this model, the concrete consists of three parts, namely coarse aggregate, cement matrix and the interfacial transition zone (ITZ) between them.

Get PriceThe use of recycled concrete aggregates in new concrete is an alternative that can provide economical and environmental benefits. However, the influence of the inert particles on the mechanical ...

Get PriceThe New Boundaries of Structural Concrete Session SUPERCONCRETE Meso-scale simulation of the post-cracking behavior of hybrid industrial/recycled steel fiber-reinforced concrete A. Caggiano1, D. Said Schicchi2, E. Martinelli3 and G. Etse1 ABSTRACT: This paper aims at investigating the mechanical behavior of concrete reinforced with

Get PriceIn the past decade, directly reusing large pieces of coarsely crushed concrete (referred to as demolished concrete lumps or DCLs) with fresh concrete in new construction was demonstrated as an efficient technique for the recycling of waste concrete. Previous studies investigated the mechanical properties of recycled lump concrete (RLC) containing different sizes of DCLs; however, for actual ...

Get PriceMar 12, 2014 In the meso-scale model, concrete specimen is assumed to be a two-phase composite material consisting of coarse aggregates with volume percentage 35 % and mortar matrix. Three series of coarse aggregates, namely 4–8, 8–12 and 12–16 mm, are considered in the numerical model.

Get PriceThis study establishes 3D meso-scale model of metaconcrete including mortar, randomly distributed natural aggregates and engineered aggregates to simulate spall behaviors of metaconcrete via the software LS-DYNA. The responses of metaconcrete composed of engineered aggregates with single bandgap and multiple bandgaps are studied.

Get PriceGenerating random aggregate models (RAMs) plays a key role in the mesoscopic modelling of concrete-like composite materials. The arbitrary geometry, wide gradation, and high volume ratio of aggregates pose a great challenge for fast and efficient numerical construction of concrete meso-structures. This paper presents a simple strategy for generating RAMs of concrete based on Laguerre ...

Get PriceThe use of recycled concrete aggregates in new concrete is an alternative that can provide economical and environmental benefits. However, the influence of the inert particles on the mechanical ...

Get PriceA recently developed FE-based mesostructural model for the mechanical behavior of heterogeneous quasi-brittle materials is used systematically to analyze concrete specimens in 2D. The numerical model is based on the use of zero-thickness interface elements equipped with a normal-shear traction-separation constitutive law representing non-linear fracture, which may be considered a mixed-mode ...

Get PriceDr. Xiao’s main areas of research are in the material behavior and structural performance of recycled aggregate concrete, aspects he has been exploring for the past 15 years. He is the author or co-author of more than 300 papers on material properties and material behavior, interfacial layer mechanisms, and modeled recycled aggregate concrete.

Get PriceTítulo del Capítulo: Meso-structural modelling in recycled aggregate concrete (Chapter 15) Título del Libro: ECO-EFFICIENT CONCRETE Subtitle: New trends in concrete with Recycled Aggregates. Editors: Jorge de Brito and Francisco Agrela. Autores: C. Medina, J. Sánchez, I.F. Sáez del Bosque, M. Frías, M.I. Sánchez de Rojas

Get PriceDec 09, 2020 The use of recycled aggregate (RA) to produce recycled aggregate concrete (RAC) is a proven way of decreasing the consumption of natural aggregate (NA) and the landfilling of construction and demolition waste. However, adoption of codes for the design of

Get PriceThe numerical model proposed in the paper is in the first time used to analyze the mechanical properties of recycled aggregate concrete. Efficiency and accuracy of the numerical model has been demonstrated. It is indicated that this model has potential to be extended for 3 dimensional structural analysis of recycled aggregate concrete.

Get PriceFeb 07, 2018 Coupled C-M meso-scale model for ASR expansion in concrete J. Liaudat, C.M. López I. Carol. Numerical strategies for the modelling of reinforced concrete structures affected by internal swelling in variable thermo-hydric conditions B. Nedjar C. Rospars. A finite element implementation of delayed ettringite formation in concrete structures

Get PriceTogether with the meso/micro-scale mechanical properties of each phase in Modeled Recycled Aggregate Concrete (MRAC), the plastic-damage constitutive models are employed in numerical studies on MRAC under uniaxial compression and uniaxial tension loadings to predict the overall mechanical behavior, particularly the stress-strain relationship.

Get PriceMar 26, 2014 Constitutive and multiscale modelling of concrete. Hierarchical multiscale models for localization phenomena within the framework of FE2-X1 J.F. Unger. Modeling of Alkali-Silica Reaction in concrete: A multiscale approach for structural analysis R. Esposito M.A.N. Hendriks. A novel strain-rate model for concrete and its influence on wave ...

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