scholarly journals Effect of film thickness on resistance to permanent deformation in asphalt mixtures

2015 ◽  
Vol 10 (4) ◽  
pp. 333-339 ◽  
Author(s):  
Eva Remišová
Keyword(s):  
Film Thickness ◽  
Specific Surface ◽  
Compression Test ◽  
Asphalt Concrete ◽  
Permanent Deformation ◽  
Asphalt Mixtures ◽  
Aggregate Gradation ◽  
Bituminous Mixtures ◽  
Cyclic Compression ◽  
Stiff Material

The resistance of asphalt mixtures against permanent deformation is one of important requirements that have to be verified in the design process of asphalt mixtures. In the case of asphalt concrete the European Standard EN 13108-1:2006 Bituminous Mixtures. Material Specifications. Part 1: Asphalt Concrete allows empirical (compositional recipes and requirements) or fundamental approach for testing of permanent deformation resistance. A fundamental approach specifies asphalt concrete in terms of performance-based requirements linked to limited prescription of composition and constituent materials. In this design approach a triaxial cyclic compression test is used to verify resistance to permanent deformation. The presented study investigates characteristics of resistance to rutting of asphalt concrete mixtures (eight mixtures of AC 11 from different producers) determined by triaxial cyclic compression test. The basic conclusions and statements of main factors influenced resistance to rutting (type of binder, binder content, and aggregate gradation) have been worked out from prevenient experience and experimental measuring. But measured test results presented in the following paper point out differences in resistance however the bitumen contents are relatively the same. During detailed investigation the tested asphalt mixtures had small differences in aggregate gradation. Changes in gradation make change of aggregate specific surface and the mixture needs different bitumen content to coat aggregate particles, to bound them to each other and to make stiff material resistant to rutting. The results from measuring of resistance to permanent deformation show the relation between aggregate specific surface and bitumen film thickness and permanent deformation.

Influence of Aggregate Gradation on the Permanent Deformation of Asphalt Mixtures

2021 ◽  
pp. 1063-1069
Author(s):  
Bernardita Lira ◽  
Robert Lundström ◽  
Jonas Ekblad
Keyword(s):  
Permanent Deformation ◽  
Asphalt Mixtures ◽  
Aggregate Gradation

Evaluation and Selection of Aggregate Gradations for Asphalt Mixtures Using Superpave

1997 ◽  
Vol 1583 (1) ◽  
pp. 91-97 ◽  
Author(s):  
R. Michael Anderson ◽  
Hussain U. Bahia
Keyword(s):  
Design Process ◽  
Permanent Deformation ◽  
Asphalt Binder ◽  
Asphalt Mixtures ◽  
Mix Design ◽  
Second Phase ◽  
Aggregate Structure ◽  
Aggregate Gradation ◽  
Complex Process ◽  
Selection Of

The design of asphalt mixtures is a complex process that requires the proper proportioning of materials to satisfy mixture volumetric and mechanical properties. The majority of time spent in the mix design process is used in evaluating and selecting aggregate gradations to meet project requirements. The latest set of requirements for asphalt mixtures is the Superpave system, developed during the Strategic Highway Research Program. This system incorporates materials selection, evaluation of trial aggregate structures, selection of design asphalt binder content, moisture sensitivity, and, in some cases, determination of performance properties of the selected asphalt-aggregate blend. The selection of a design aggregate structure reduces to selecting an aggregate gradation that will meet minimum volumetric and densification criteria, and selecting an aggregate structure that will provide adequate resistance to permanent deformation, fatigue, and thermal cracking. In the Superpave volumetric mix design process, achieving voids in mineral aggregate (VMA) is the most difficult task facing the mix designer. One phase of this evaluation focuses on providing Guidelines to achieve VMA requirements with Superpave mix designs. This phase was accomplished by evaluating the existing database of information on Superpave mix designs at the Asphalt Institute. The second phase examines the relationship between properties determined during the Superpave volumetric mix design process, and material properties determined by mix analysis tests.

Analytical Formulas for Film Thickness in Compacted Asphalt Mixture

2003 ◽  
Vol 1829 (1) ◽  
pp. 26-32 ◽  
Author(s):  
Boris Radovskiy
Keyword(s):  
Film Thickness ◽  
Asphalt Concrete ◽  
Volume Fraction ◽  
Asphalt Mixture ◽  
Modern Technology ◽  
Asphalt Mixtures ◽  
Statistical Geometry ◽  
Arbitrary Size ◽  
Analytical Formulas ◽  
Asphalt Film

Recently, several researchers have proposed asphalt film thickness as a criterion for ensuring the durability of asphalt mixtures. However, they suggested that the standard film thickness equation, which dates back to the 1940s, needs to be examined by modern technology and improved. A presumable background on which the Asphalt Institute surface area factors are based was recovered and analyzed in detail. A fundamentally sound model for film thickness calculation was developed using a model of asphalt concrete in which the aggregates are spherical but have an arbitrary size distribution. A recent result from statistical geometry is applied to determine the film thickness for any volume fraction of aggregates and any volume fraction of effective asphalt. The analytical formulas are presented, the details of the calculation are summarized, and examples are provided.

Effect of Binder Rheology and Aggregate Gradation on the Permanent Deformation of Asphalt Mixtures

2021 ◽  
Author(s):  
Rafael V. Mota ◽  
André K. Kuchiishi ◽  
Marcia M. Takahashi ◽  
Gabriel de Souza ◽  
Felipe F. Camargo ◽  
...  
Keyword(s):  
Permanent Deformation ◽  
Asphalt Mixtures ◽  
Aggregate Gradation

Investigation of Creep Mechanics Properties of Layered Nano-Montmorillonite Modified Asphalt Mixtures

2011 ◽  
Vol 467-469 ◽  
pp. 1541-1545 ◽  
Author(s):  
Tian Gui Liu ◽  
Shao Peng Wu ◽  
Jun Han
Keyword(s):  
Elastic Property ◽  
Asphalt Concrete ◽  
Permanent Deformation ◽  
Asphalt Binder ◽  
Testing Machine ◽  
Asphalt Mixture ◽  
Layered Silicate ◽  
Asphalt Mixtures ◽  
Modified Bitumen ◽  
Modified Asphalt

Montmorillonite（MMT）is a typical layered silicate. It has been widely used to modify polymers. It improves the thermal, mechanical and aging properties of polymers. The prominent features of MMT modified asphalt concrete are significant for prolonging the service life of asphalt pavement. The profound researches on the service performance and mechanical characteristics of MMT modified asphalt binder and mixtures are important for the application of MMT modified asphalt concrete in practice projects. The effect of MMT on the creep properties of asphalt mixture has been investigated in the research. The result showed that the physical capabilities of MMT modified bitumen was improved evidently. UTM 25 electro-hydraulic servo-universal testing machine was used to do Creep Text, and proper rheological models are employed to describe such characteristics. Results indicated that the visco-elastic properties of the mixtures can be changed by the use of MMT. The revised Burgers model is suitable for the visco-elastic property research of MMT modified asphalt mixtures. The model demonstrated that the retardant visco-elastic property and viscous property of asphalt mixtures containing MMT can be improved, which result in the enhancement of resistance to permanent deformation for MMT modified asphalt mixtures.

scholarly journals Fractal Dimension for the Characterization of the Porosity of Asphalt Concretes

2010 ◽  
Vol 56 (4) ◽  
pp. 321-333 ◽  
Author(s):  
G. Leonardi
Keyword(s):  
Fractal Dimension ◽  
Asphalt Concrete ◽  
Experimental Approach ◽  
Asphalt Mixtures ◽  
Physical Parameters ◽  
Aggregate Gradation ◽  
Fractal Approach ◽  
Fractal Characteristics ◽  
Concrete Materials

Abstract In the design of asphalt mixtures for paving, the choice of components has a remarkable importance, as requirements of quality and durability must be assured in use, guaranteeing adequate standards of safety and comfort. In this paper, an approach of analysis on the aggregate materials using fractal geometry is proposed. Following an analytical and an experimental approach, it was possible to find a correlation between characteristics of the asphalt concrete (specific gravity and porosity) and the fractal dimension of the aggregate mixtures. The studies revealed that this approach allows to draw the optimal fractal dimension and, consequently, it can be used to choose an appropriate aggregate gradation for the specific application; once the appropriate initial physical parameters are finalized. This fractal approach could be employed for predicting the porosity of mixed asphalt concretes, given as input the fractal characteristics of the aggregate mixtures of the concrete materials

scholarly journals Effect of Aggregate Gradation on the Stiffness of Asphalt Mixtures

2015 ◽  
Vol 16 (2) ◽  
pp. 39-49 ◽  
Author(s):  
Hasan Al-Mosawe ◽  
Nick Thom ◽  
Gordon Airey ◽  
Amjad Al-Bayati
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Asphalt Concrete ◽  
Asphalt Mixture ◽  
Asphalt Mixtures ◽  
Volumetric Properties ◽  
Aggregate Gradation ◽  
Effect Of Particle Size ◽  
Indirect Tensile

Abstract Aggregate gradation plays an important role in the behaviour of asphalt mixtures. Packing of aggregate is a very important factor that will be affected by changing the aggregate gradation. Many researchers have investigated different ways of describing packing both theoretically and practically. Bailey ratios have recently been used to understand the volumetric properties of mixtures. In this paper, the Bailey ratios have been used, and two further ratios have also been introduced to allow the asphalt mixture gradation to be fully understood. Thirteen different aggregate gradations have been chosen within the 14 mm asphalt concrete specification to investigate the effect of particle size distribution on the stiffness of the mixture. It was found that variation in aggregate gradation has a significant effect on asphalt stiffness, even within specification limits, and a reasonable correlation between the set of ratios investigated and the Indirect Tensile Stiffness.

scholarly journals Performance characteristics of the open-graded asphalt concrete filled with a special cement grout

2015 ◽  
Vol 10 (4) ◽  
pp. 316-324 ◽  
Author(s):  
Pavlina Cihackova ◽  
Petr Hyzl ◽  
Dusan Stehlik ◽  
Ondrej Dasek ◽  
Ovidijus Šernas ◽  
...  
Keyword(s):  
Asphalt Concrete ◽  
Permanent Deformation ◽  
Design Procedure ◽  
Asphalt Mixtures ◽  
Cement Grout ◽  
Skid Resistance ◽  
Asphalt Mixes ◽  
Stiffness Measurement ◽  
The Road ◽  
Laboratory Design

This paper presents a performance of the open-graded asphalt concrete filled with a special cement grout in the road structures, introduces practical examples of the usage of this technology and defines the main properties. In addition, laboratory design of asphalt mixtures filled with special grout is researched. Finally, the results obtained from various laboratory tests are evaluated. The paper contains the open-graded asphalt concrete filled with a special cement grout mix design procedure and results of stiffness measurement, low temperature properties, permanent deformation and skid resistance. Open-graded asphalt concrete filled with a special cement grout mixture is compared to the commonly used asphalt mixes. The open-graded asphalt concrete filled with a special cement grout showed better results than the commonly used asphalt mixes by the stiffness and resistance to the permanent deformation characteristics but behavior at the low temperatures is slightly problematic.

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