Numerical and analytical length scale investigation on viscoelastic behavior of bituminous composites: Focusing on mortar scale

Khodadadi, Mojtaba; Khodaii, Ali; Absi, Joseph; Tehrani, Fateh Fakhari; Hajikarimi, Pouria

doi:10.1016/j.conbuildmat.2022.128775

Cited by 7 publications

(3 citation statements)

References 39 publications

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“…However, such a division of structures is impossible for FEM modelling because it is very difficult to separate, e.g., bitumen from filler and fine mineral aggregate. That is why asphalt mixture, mastic, mortar, and bitumen are most often mentioned in empirical and experimental works [7,8]. The conclusions from the research [9,10] indicate that the LVE properties of bituminous composites can be predicted based on the model within the acceptable error range.…”

Section: Introductionmentioning

confidence: 95%

The Influence of Mortar’s Poisson Ratio and Viscous Properties on Effective Stiffness and Anisotropy of Asphalt Mixture

Gajewski

Król

2022

Materials

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This paper presents the results of a research study and analysis conducted to determine the degree of anisotropy of asphalt concrete in terms of its initial elastic properties. The analysis of asphalt concrete was focused on determining the effective constrained stiffness modulus in three mutually perpendicular directions based on the finite element method. The internal structure of the asphalt concrete was divided into the mortar phase and the mineral aggregate phase. Static creep tests using the Bending Beam Rheometer were conducted for the mortar phase to fit the rheological model. The aggregate arrangement and orientation were analysed using an image analytical technique for the mineral phase. The Finite Element Method (FEM) meshes were prepared based on grey images with an assumption of plane strain in 2D formulation. Using the FEM model, the tension/compression tests using selected characteristic directions were conducted, and the effective constrained stiffness moduli were estimated. This study showed a dominant horizontal direction for all coarse aggregates resulting from the normal force of the road roller and paving machines during laying and compaction on a road site. Depending on the values of the mortar’s mechanical parameters and the load direction, the effective stiffness modulus might differ by ±20%. Based on the FEM analysis, this result was proven and commented on through an effective directional modulus evaluation and a presentation of internal stress distribution. Depending on the shape and orientation of the aggregates, it was possible to observe local “stress bridging” (transferring stresses from aggregate to aggregate when contacting). Moreover, the rheological properties of the mortar were considered by assuming two limiting situations (instantaneous and relaxed moduli), determining the bands of all possible solutions. In the performed FEM analysis, the influence of the Poisson ratio was also considered. The analysed asphalt concrete tends to be isotropic when the Poisson’s mortar ratio is close to the value of 0.5, which agrees with the physical expectations. The obtained results are limited to particular asphalt concrete and should not be extrapolated to other asphalt mixture types without prior analysis.

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Section: Introductionmentioning

confidence: 95%

The Influence of Mortar’s Poisson Ratio and Viscous Properties on Effective Stiffness and Anisotropy of Asphalt Mixture

Gajewski

Król

2022

Materials

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“…The aging rate of service pavement mixtures is also affected by the air void content [13][14][15]. Thus, the air void content is another vital control parameter for compaction, since dense and loose compactions in the same type of mixture have different volume properties and pavement performances [16].…”

Section: Introductionmentioning

confidence: 99%

“…The multiscale approach to asphalt mixtures has drawn increasing attention at the multiscale level, such as mortar and mastic, when comparing the asphalt materials' performance at this scale. Mortar, or FAM (fine aggregate matrix), is the transaction scale between asphalt binder and asphalt mixture, which has both the viscoelastic properties of asphalt binder and dynamic modulus and fatigue performance similar to asphalt mixture [16]. With these features, mortar research on asphalt mixtures has been vital for understanding mixture performances or distress mechanisms [17].…”

Section: Introductionmentioning

confidence: 99%

Calculation and Characterization of Air Void in Mortar of the Hot Mix Asphalt (HMA) Based on CT Scanning and Image Analysis Methods

Shu

Jiang

et al. 2023

Applied Sciences

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The air void content is one of the most important volumetric properties of asphalt matrixes, such as asphalt mixtures or mortars, because it can greatly affect the performance of the matrix. At the mixture level, there are standardized methods for measuring the air void content, which is an important design parameter of a mixture. However, at the mortar scale, no unified method has been proposed to determine the air void content corresponding to the asphalt mixture. Therefore, this research aims to, first, characterize the air void distribution within the mortar of an asphalt mixture and then develop an updated theoretical method for calculating the air void content of asphalt mortar. The internal structures of air voids from three commonly used asphalt mixtures with different gradations were captured using an industrial CT scanning technique and then morphologically characterized using the image analysis method. Three-dimensional models of the air voids were reconstructed, and the air void content calculated from the CT images was also verified by density tests. The scanning results show that the air void content and air void size fit the cumulative Weibull curve. The results show that the nominal maximum particle size (NMPS) of mortar and the mixture air void content were the main parameters that affected the mortar’s air voids. The mortar air void content had linear relationships with both the mixture air void content and the mixture asphalt aggregate ratio. The mortar air void content was more sensitive to the NMPS of the asphalt mixture compared with the air void content or asphalt aggregate ratio of the mixture. This research provides a quantitative method to calculate the air void content of asphalt mortar within a mixture, which may help in the matrix design of mortar.

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Elastic Properties Study of Composite Mortar with Recycled Rubber Aggregates: with and Without Compatibilizing Agents

Pinzon-Moreno,

Ribeiro,

Saron

2024

J. Vib. Eng. Technol.

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Numerical and analytical length scale investigation on viscoelastic behavior of bituminous composites: Focusing on mortar scale

Cited by 7 publications

References 39 publications

The Influence of Mortar’s Poisson Ratio and Viscous Properties on Effective Stiffness and Anisotropy of Asphalt Mixture

The Influence of Mortar’s Poisson Ratio and Viscous Properties on Effective Stiffness and Anisotropy of Asphalt Mixture

Calculation and Characterization of Air Void in Mortar of the Hot Mix Asphalt (HMA) Based on CT Scanning and Image Analysis Methods

Elastic Properties Study of Composite Mortar with Recycled Rubber Aggregates: with and Without Compatibilizing Agents

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