scholarly journals Synthetic Microstructure Generation and Multiscale Analysis of Asphalt Concrete

2020 ◽  
Vol 10 (3) ◽  
pp. 765
Author(s):  
Marek Klimczak ◽  
Witold Cecot
Keyword(s):  
Numerical Analysis ◽  
Asphalt Concrete ◽  
Voronoi Tessellation ◽  
Numerical Test ◽  
Constitutive Models ◽  
Microstructure Modeling ◽  
Modeling Process ◽  
Perfect Bonding ◽  
X Ray Computed ◽  
The Cost

In this paper, we present an enhanced framework for the synthetic asphalt concrete (AC) microstructure generation for the numerical analysis purposes. It is based on the Voronoi tessellation concept with some necessary extensions that allow for the reliable generation of the aggregate particles of the given size distribution. The synthetic microstructure generation allows for faster numerical modeling of the novel materials. It can partially replace the X-ray computed tomography approach, which is frequently used in such analysis. Our framework is a kind of compilation of the known techniques with the enhancements applied to expedite the microstructure modeling process. Therefore, the generated microstructure is used in the numerical upscaling to model the macroscale asphalt concrete properties. We restrict ourselves (in this paper only) to the 2D elastic computations. We also assume the perfect bonding between these two materials and the static load for the sake of simplicity. The upscaling is performed by the multiscale finite element method (MsFEM). A short recapitulation of the MsFEM foundations as well as the numerical test comparing the overkill mesh solution with the upscaled one is provided in the paper. The test results confirm that the whole presented methodology can serve as a fast and reliable tool for the tests on novel asphalt mixtures and other heterogeneous materials. It can reduce the cost of the design process substituting some of the laboratory experiments, giving the opportunity to test the developed constitutive models and expedite the numerical analysis itself.

scholarly journals Economic analysis of the inclusion of thermoelectric ash in asphalt mixtures

2021 ◽  
Vol 10 (10) ◽  
pp. e28101018564
Author(s):  
Igor Nonato Almeida Pereira ◽  
Newton Paulo de Souza Falcão ◽  
Consuelo Alves da Frota
Keyword(s):  
Asphalt Concrete ◽  
Lower Cost ◽  
Electric Energy ◽  
Asphalt Mixtures ◽  
Raw Material ◽  
Stone Dust ◽  
Alternative Material ◽  
Good Technique ◽  
Materials Used ◽  
The Cost

The replacement of conventional materials used in hot asphalt mixtures with others of good technique and lower cost and environmental impact has motivated research in this area of knowledge in recent decades. The researches should be expanded in the scope of engineering, given that it contributes considerably to the transformation of spaces and raw material. In this context, thermoelectric ashes, which are residues from the production of electric energy, appear as an alternative to replace the stone powder input which contributes negatively to the environment considering that it comes from the blasting of rocks. This work aims to compare the cost of producing traditional asphalt concrete (reference) to asphalt compositions containing 5,15% of alternative material characterized by stone dust. There was a saving of R$ 0.21 per ton of AC machining, consisting of thermoelectric ash as a partial substitute (5.15%) for stone powder, which represents significant savings in a practical context.

scholarly journals Numerical Analysis of Concrete Block Pavements and Comparison of its Settlement with Asphalt Concrete Pavements using Finite Element Method

2014 ◽  
Vol 18 (4) ◽  
pp. 39-51 ◽  
Author(s):  
Gholamali Shafabakhsh ◽  
Afshin Family ◽  
Babak Pourzand Hossein Abad
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Analysis ◽  
Asphalt Concrete ◽  
Concrete Block ◽  
Concrete Pavements ◽  
Element Method

Effect of infill and density pattern on the mechanical behaviour of ABS parts manufactured by FDM using Taguchi and ANOVA approach

2021 ◽  
Vol 111 (2) ◽  
pp. 66-77
Author(s):  
M. Othmani ◽  
K. Zarbane ◽  
A. Chouaf
Keyword(s):  
Tensile Strength ◽  
Computer Aided Design ◽  
Numerical Test ◽  
Acrylonitrile Butadiene Styrene ◽  
Tensile Behaviour ◽  
Element Analysis ◽  
Mechanical Tensile ◽  
Experimental Values ◽  
The Cost ◽  
Aided Design

Purpose: The present work aims to investigate the effect of many infill patterns (rectilinear, line, grid, triangles, cubic, concentric, honeycomb, 3D honeycomb) and the infill density on the mechanical tensile strength of an Acrylonitrile Butadiene Styrene (ABS) test specimen manufactured numerically by FDM. Design/methodology/approach: Computer-Aided Design (CAD) software has been used to model the geometry and the mesostructure of the test specimens in a fully automatic manner from a G-code file by using a script. Then, a Numerical Design of Experiments (NDoE) has been carried out by using Taguchi method and the Analysis of Variance (ANOVA). The tensile behaviour of these numerical test specimens has been studied by the Finite Element Analysis (FEA). Findings: The FEA results showed that a maximal Ultimate Tensile Strength (UTS) was reached by using the ‘concentric’ infill pattern combined with an infill density of 30%. The results also show that the infill pattern and the infill density are significant factors. Research limitations/implications: The low infill densities of 20% and 30% that have already been used in many previous studies, we have also applied it in order to reduce the time of the simulations. Indeed, with high infill density, the simulations take a very excessive time. In an ongoing study, we predicted higher percentages. Practical implications: This study provided an important modelling tool for the design and manufacture of functional parts and helps the FDM practitioners and engineers to manufacture strong and lightweight FDM parts by choosing the optimal process parameters. Originality/value: This study elucidated the effect of various infill patterns on the tensile properties of the test specimens and applied for the first time a NDoE using numerical test specimens created by the mesostructured approach, which considerably minimized the cost of the experiments while obtaining an error of 6.8% between the numerical and the experimental values of the UTS.

scholarly journals Numerical Analysis of Diaphragm Wall Model Executed in Poznań Clay Formation Applying Selected Fem Codes

2016 ◽  
Vol 62 (3) ◽  
pp. 207-224 ◽  
Author(s):  
M. Superczyńska ◽  
K. Józefiak ◽  
A. Zbiciak
Keyword(s):  
Numerical Analysis ◽  
Constitutive Models ◽  
Experimental Tests ◽  
Numerical Calculations ◽  
Diaphragm Wall ◽  
Construction Site ◽  
Wall Model ◽  
City Area ◽  
Clay Formation ◽  
Horizontal Displacements

Abstract The paper presents results of numerical calculations of a diaphragm wall model executed in Poznań clay formation. Two selected FEM codes were applied, Plaxis and Abaqus. Geological description of Poznań clay formation in Poland as well as geotechnical conditions on construction site in Warsaw city area were presented. The constitutive models of clay implemented both in Plaxis and Abaqus were discussed. The parameters of the Poznań clay constitutive models were assumed based on authors’ experimental tests. The results of numerical analysis were compared taking into account the measured values of horizontal displacements.

Constitutive Modeling of Asphalt Bound Granular Materials: Theoretical Background

2002 ◽  
Author(s):  
J. Murali Krishnan ◽  
K. R. Rajagopal
Keyword(s):  
Creep Test ◽  
Asphalt Concrete ◽  
Constitutive Modeling ◽  
Hot Mix Asphalt ◽  
Constitutive Models ◽  
Companion Paper ◽  
Theoretical Background ◽  
Asphalt Mixtures ◽  
Unified Approach ◽  
Multiple Natural Configurations

Different kinds of hot mix asphalt mixtures are used in highway and runway constructions. Each of these mixtures cater to specific needs and differ from each other in the type and percentage of aggregates and asphalt used, and their response can be markedly different. Constitutive models used in the literature do not differentiate between these different kinds of mixtures and use models which treat them as if they are one and the same. In this study, we propose constitutive models for two different kinds of hot mix asphalt, viz., asphalt concrete and sand asphalt. We use a framework for materials that possess multiple natural configurations for deriving the constitutive equations. While asphalt concrete is modeled as a two constituent mixture, sand asphalt is modeled as a single constituent mixture due to the peculiarity in its makeup. In this study, we present a unified approach for deriving models for these different kind of mixtures. In a companion paper, we compare the predictions of the model for a compressive creep test with available experimental results.

An assessment of SBS modified asphalt concrete pavements performance features performing numerical analysis

2017 ◽  
Author(s):  
Ahmet Sertac Karakas ◽  
Tarik Serhat Bozkurt ◽  
Baris Sayin ◽  
Faruk Ortes
Keyword(s):  
Numerical Analysis ◽  
Asphalt Concrete ◽  
Concrete Pavements ◽  
Modified Asphalt ◽  
Sbs Modified Asphalt

scholarly journals Numerical analysis of settlement of a high-rise building using two constitutive soil models

2019 ◽  
Vol 262 ◽  
pp. 04002
Author(s):  
Leszek Chomacki
Keyword(s):  
Numerical Analysis ◽  
Constitutive Models ◽  
Soil Parameters ◽  
Geotechnical Parameters ◽  
High Rise ◽  
High Rise Building ◽  
Perfectly Plastic ◽  
Calculation Process ◽  
Elastic Perfectly Plastic ◽  
Key Parameter

One of the basic roles of foundations is to safely transfer loads from the structure to the subsoil in a controlled manner. Often a key parameter in deciding whether the foundation was designed correctly is the value of settlement of the building and the ground around it. This paper attempts to numerically reproduce the measured settlement of a high-rise building using geotechnical parameters already available. For this purpose, numerical calculations were carried out using two constitutive soil models: the elastic-perfectly plastic model with Mohr-Coulomb plastic criteria (MC) model and the Hardening Soil (HS) model. The resulting settlement values were compared with surveying measurements taken during and after the building’s construction. In the summary the results obtained with the use of different constitutive models, the calculation process and the adopted soil parameters are analysed and discussed.

scholarly journals Recommendations for determining the thickness of the road pavement of technological roads built from coal-bearing rocks

2019 ◽  
Vol 134 ◽  
pp. 01013
Author(s):  
Victor A. Shalamanov ◽  
Sergey N. Shabaev ◽  
Faruz Alama
Keyword(s):  
Asphalt Concrete ◽  
Open Pit ◽  
Open Pit Mining ◽  
Coal Production ◽  
Mining Method ◽  
Cement Concrete ◽  
Mining Company ◽  
The Road ◽  
Road Pavement ◽  
The Cost

With open-pit mining method in Kuzbass is widely used automobile transport, transportation costs up to 70% of the cost of coal production. It is not economically feasible to use asphalt concrete and cement concrete as a material of temporary technological roads, and the use of crushed coal-bearing rocks will make it possible to increase the efficiency of coal mining by open method. Currently, the question of the application of the coal-bearing rocks for building temporary technological roads is poorly studied. The paper proposes a method of determining the thickness of road pavements of technological roads, which can be applied directly by the mining company, their analysis has been carried out, the dependence from the strength factor and the category of blockiness of foundation rocks has been determined.

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