An investigation on the mechanical properties of granular materials in interface with asphaltic concrete

Tajdini, Milad; Mahinroosta, Reza; Taherkhani, Hasan

doi:10.1016/j.conbuildmat.2014.03.016

Cited by 14 publications

(3 citation statements)

References 6 publications

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“…The strength of asphalt concrete materials is mainly associated with the cohesion of asphalt, the internal friction resistance of aggregate, and the adhesion between aggregate and asphalt binder. Therefore, Mohr-Coulomb strength theory can be applied to asphalt concrete materials successfully [8,25,26], and it is considered that the shear strength of asphalt concrete materials obeys the following relationship:…”

Section: Shear Failure Control Standard Of Accmentioning

confidence: 99%

Improvement Methods for Reduction of the High Stress of Ultra-High Asphalt Concrete Core Dams

Gao

Dang

et al. 2019

Applied Sciences

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With the rapid development of asphalt concrete core rockfill dams (ACCRDs), the construction of ultra-high asphalt concrete core rockfill dams (UACCRDs) has been improved significantly. However, the security problems of asphalt concrete core (ACC) become very prominent with the increase of dam height. The shear failure control standard and tensile failure control standard of ACC are suggested. The mechanisms of ACC that generate high shear stress and high tensile stress are investigated. Based on the definition of stress level and the transmission mechanism of arch structures, the improvement methods that reduce the high shear stress and high tensile stress of ultra-high asphalt concrete core (UACC) are proposed and investigated. The results show that the stress level of ACC can be reduced significantly by the increase of the strength parameters of ACC (failure ratio, cohesion, and internal friction angle). The following value ranges of the failure ratio, cohesion, and internal friction angle of ACC for the suitable construction of UACCRDs are recommended: Rf ≥ 0.75, C ≥ 0.30 MPa, and φ ≥ 28.5° (h = 150 m), with the growth gradient adjusted by 5%, 15%, and 5%/25 m. The tensile stress and tensile stress area can be reduced obviously by the new type of dams (curved asphalt concrete core rockfill dams (CACCRDs)). The value ranges of the curvature of CACC (k ≥ 1.0 × 10−3) for the suitable construction of UACCRDs are recommended.

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Section: Shear Failure Control Standard Of Accmentioning

confidence: 99%

Improvement Methods for Reduction of the High Stress of Ultra-High Asphalt Concrete Core Dams

Gao

Dang

et al. 2019

Applied Sciences

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“…On the one hand, in the model experiments, the mechanical properties of the core are mainly studied by the shear effect of the two interfaces [4] . Tajdini et al (2014) [5] considered the interface between mortar and asphalt concrete under dry and saturated conditions. Through small-scale direct shear tests, the effects of asphalt permeability grade, moisture and density on shear strength under different normal stress levels and constant shear rates were carried out.…”

Section: Introductionmentioning

confidence: 99%

Influence of joint form on shear characteristics of asphalt concrete core under steep bank slope condition

Li,

Liu

et al. 2024

Preprint

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The connection performance between the core and the concrete plinth under steep bank slope conditions is related to the overall seepage safety of the dam. In this study, combined with the actual engineering, the steep slope control groups with slopes of 71°, 76° and 81° were designed. The research scheme not only considers the limit situation of the existing specifications, but also makes further exploration on the situation of high and steep valleys beyond the specifications. Considering the asymmetric valley and the symmetric valley, two contact forms of arc joint and flat joint are set up. Based on the numerical calculation, the influence of the joint embedding depth and the amplification angle on the shear action of the asphalt concrete core (ACC) is quantitatively studied. The results indicate that the symmetry of the valley will cause stress to deflect, affecting the characteristics of shear stress of the core. Under the condition of high-steep bank slope, large shear deformation occurs at the joint of ACC, and significant arching occurs near the bank slope. The overall stress level of the arc joint is higher than that of the flat joint, and it is highly sensitive to the change of the bank slope. Increasing the embedded depth of the joint, the local shear effect of the core wall becomes larger. As the joint magnification angle decreases, the stress level of the core and the maximum shear stress decrease. Expanding the contact surface of the joint can reduce the shear effect of the core. This study breaks through the conventional dam construction conditions and explores the mechanical properties of anti-seepage bodies in high and steep valleys. The research results of this paper can provide reference for the design of ACC joints under extreme steep bank slope conditions.

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“…[1][2][3] Rockfill and transition materials account for the largest proportion of the dam materials. Their particle size distribution directly influences dry density, permeability, shear strength, and other physical and compaction properties [4][5][6] and therefore influences the quality and safety of dams. The particle size distribution of a granular material is commonly expressed by its particle grading curve and the related characteristic parameters of uniformity coefficient Cu and curvature coefficient Cc.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of particle size distribution of granular blasting materials based on the fractal theory

Yao

et al. 2019

Advances in Mechanical Engineering

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The particle size distribution of granular blasting materials has a vital influence on the filling quality of earth-rockfill dams. The engineering experience-based method used to evaluate the particle size distribution has shortcomings at both the theoretical and practical aspects. This article proposes a new evaluation method based on the fractal theory. Grading sieve tests on granular materials, mass fractal analysis of particle size distribution, and a probability distribution model test of the characteristic parameters are used to revise the functional relationships between the fractal dimension D and the uniformity coefficient/curvature coefficient ( Cu/ Cc) of the grading curve. The feasibility of using D to evaluate the particle size distribution and the optimal fine grain content is then analyzed and determined. According to the results, the geometric shapes of the granular blasting materials have fractal characteristics, and their particle size distribution has a fractal distribution. The ranges of D where the rockfill and transition materials have a good particle size distribution are D = 2.254–2.529 and D = 2.358–2.559, corresponding to optimal fine grain content of 1.953%–11.805% and 10.268%–23.123%, respectively. Fractal dimension has a solid theoretical basis and strong practical applicability as an evaluation index for the particle size distribution of granular blasting materials.

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An investigation on the mechanical properties of granular materials in interface with asphaltic concrete

Cited by 14 publications

References 6 publications

Improvement Methods for Reduction of the High Stress of Ultra-High Asphalt Concrete Core Dams

Improvement Methods for Reduction of the High Stress of Ultra-High Asphalt Concrete Core Dams

Influence of joint form on shear characteristics of asphalt concrete core under steep bank slope condition

Evaluation of particle size distribution of granular blasting materials based on the fractal theory

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