scholarly journals Indirect Tensile Test as a Simple Method for Rut Resistance Evaluation of Asphalt Concrete

2019 ◽  
Vol 65 (3) ◽  
pp. 31-44 ◽  
Author(s):  
P. Zieliński
Keyword(s):  
Asphalt Mixture ◽  
Correlation Coefficients ◽  
Simple Method ◽  
Indirect Tensile Test ◽  
Technical Requirements ◽  
Regression Functions ◽  
Indirect Tensile ◽  
Prediction Limits ◽  
Wheel Tracking ◽  
Mixture Samples

AbstractThe paper presents the dependence of ITS results at the elevated temperature (40°C) on rutting parameters, i.e. proportional rut depth (PRDAIR) and wheel tracking speed (WTSAIR), obtained at the temperature of 60°C. The asphalt mixture samples were prepared in the gyratory compactor, but ITS tests were conducted with typical Marshall press, at a loading rate of 50 mm/min. Correlation analyses show a strong relationships between ITS results and rutting parameters, whereby the correlation coefficients obtained are higher for the PRDAIR parameter (r = −0.88) than WTSAIR (r = −0.81). Using the obtained regression functions, the prediction limits as well as confidence limits were calculated, which allowed to develop criteria for assessing resistance to rutting on the basis of ITS test, and taking into account the technical requirements in Poland.

Effectiveness of Loaded Wheel Tracking Test to Ascertain Moisture Susceptibility of Asphalt Mixtures

2021 ◽  
pp. 036119812110363
Author(s):  
Moses Akentuna ◽  
Louay N. Mohammad ◽  
Sanchit Sachdeva ◽  
Samuel B. Cooper ◽  
Samuel B. Cooper
Keyword(s):  
Asphalt Binder ◽  
Asphalt Mixture ◽  
Moisture Damage ◽  
Asphalt Mixtures ◽  
Asphalt Binders ◽  
Creep Recovery ◽  
Moisture Susceptibility ◽  
Freeze Thaw ◽  
Wheel Tracking ◽  
Mixture Samples

Moisture damage of asphalt mixtures is a major distress affecting the durability of asphalt pavements. The loaded wheel tracking (LWT) test is gaining popularity in determining moisture damage because of its ability to relate laboratory performance to field performance. However, the accuracy of LWT’s “pass/fail” criteria for screening mixtures is limited. The objective of this study was to evaluate the capability of the LWT test to identify moisture susceptibility of asphalt mixtures with different moisture conditioning protocols. Seven 12.5 mm asphalt mixtures with two asphalt binder types (unmodified PG 67-22 and modified PG 70-22), and three aggregate types (limestone, crushed gravel, and a semi-crushed gravel) were utilized. Asphalt binder and mixture samples were subjected to five conditioning levels, namely, a control; single freeze–thaw-; triple freeze–thaw-; MiST 3500 cycles; and MiST 7000 cycles. Frequency sweep at multiple temperatures and frequencies, and multiple stress creep recovery tests were performed to evaluate asphalt binders. LWT test was used to evaluate the asphalt mixture samples. Freeze–thaw and MiST conditioning resulted in an increase in stiffness in the asphalt binders as compared with the control. Further, freeze–thaw and MiST conditioning resulted in an increase in rut depth compared with the control asphalt mixture. The conditioning protocols evaluated were effective in exposing moisture-sensitive mixtures, which initially showed compliance with Louisiana asphalt mixture design specifications.

Relating Adhesion and Cohesion of Asphalts to the Effect of Moisture on Laboratory Performance of Asphalt Mixtures

2005 ◽  
Vol 1901 (1) ◽  
pp. 33-43 ◽  
Author(s):  
Kunnawee Kanitpong ◽  
Hussain Bahia
Keyword(s):  
Permanent Deformation ◽  
Asphalt Binder ◽  
Asphalt Mixture ◽  
Asphalt Mixtures ◽  
Asphalt Binders ◽  
Fundamental Properties ◽  
Water Conditioning ◽  
Before And After ◽  
Indirect Tensile ◽  
Wheel Tracking

Antistripping additives and polymer modifications are two common modifiers used to improve the fundamental properties of asphalt binders as those properties relate to the performance of asphalt mixtures. Adhesion and cohesion are two important related properties of asphalt binders that can affect asphalt mixture performance before and after water conditioning. The purpose of this study was to quantify the effects of antistripping additives and polymers on the adhesion and cohesion of binders and to relate these effects to the performance of mixtures as measured in the laboratory before and after water conditioning. The performance tests of asphalt mixtures included indirect tensile strength, uniaxial compression permanent deformation, and Hamburg wheel tracking. Asphalt mixtures were produced with different modified binders and with two aggregate types. The binders were modified with antistripping additives and polymers and by chemical treatment and oxidization methods. Granite and limestone were selected as two types of aggregate sources. The results indicate that the performance of asphalt mixtures is highly dependent on modification techniques and water conditioning. The overall performance of polymer-modified mixtures is more desirable than those of unmodified mixtures and of mixtures modified with antistripping additives. Polymers are found to improve rutting performance, adhesion, and cohesion of an asphalt binder. In contrast, the antistripping additive can improve only the adhesion without changing other properties. The results of this study also illustrate that the adhesion and cohesion of an asphalt binder are good indicators of the performance of asphalt mixtures in the laboratory when they are conditioned with water.

Fiber-Reinforced Hot-Mix Asphalt: Idaho Case Study

2017 ◽  
Vol 2633 (1) ◽  
pp. 98-107 ◽  
Author(s):  
Ahmed Muftah ◽  
Amir Bahadori ◽  
Fouad Bayomy ◽  
Emad Kassem
Keyword(s):  
Laboratory Tests ◽  
Asphalt Mixture ◽  
Asphalt Mixtures ◽  
Fiber Reinforced ◽  
Flow Number ◽  
Indirect Tensile Test ◽  
Need To Evaluate ◽  
Indirect Tensile ◽  
The One

This paper presents the findings of a research study to determine the benefits of fiber-reinforced asphalt mixtures used to mitigate distresses observed in the field. Control asphalt mixture test sections were constructed on US-30 in Idaho, along with fiber-reinforced asphalt mixture test sections. Three types of fibers were evaluated: Fiber 1 (i.e., aramid and polyolefin fiber), Fiber 2 (i.e., wax-treated aramid fiber), and Fiber 3 (i.e., glass fiber). Several laboratory tests were conducted on laboratory-prepared test samples and extracted field cores. The laboratory tests included dynamic modulus, flow number, Hamburg wheel-track test, indirect tensile test, creep compliance, and semicircular bending, in addition to performance evaluation with AASHTOWare Pavement ME Design software. The laboratory results showed no significant improvement to the properties of asphalt mixtures at the fiber content recommended by the manufacturer. However, the performance of asphalt mixtures did improve at a fiber dosage higher than the one recommended by the manufacturer. This study demonstrated the need to evaluate different fiber contents when asphalt mixtures are designed, because the dosage recommended by the manufacturer may not be optimal for various asphalt mixtures.

scholarly journals Study on Mesoscopic Mechanics of Recycled Asphalt Mixture in the Indirect Tensile Test

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Yanping Sheng ◽  
Haichuan Jia ◽  
Hongli Lv ◽  
Huaxin Chen ◽  
Xiaorui Zhao ◽  
...  
Keyword(s):  
Tensile Test ◽  
Mechanical Response ◽  
Mechanical Test ◽  
Asphalt Binder ◽  
Asphalt Mixture ◽  
Simulation Method ◽  
Recycled Asphalt ◽  
Macroscopic Appearance ◽  
Indirect Tensile Test ◽  
Indirect Tensile

Reclaimed asphalt pavement (RAP) mainly contains asphalt binder and aggregates, and the RAP materials used in paving roads could save virgin materials. This paper studied the following: asphalt mixture with different RAP material contents was prepared; then the indirect tensile test was carried out, and the mesoscopic model of the recycled asphalt mixture was reconstructed digitally. Discrete element method (DEM) of indirect tensile test was carried out to analyze the mechanical properties of recycled asphalt mixture in mesoscopic perspective. The results showed that there were some gaps between the simulation result of the digital specimen model and the test value of the recycled asphalt mixture, but the velocity vector and the law of force chain development of the recycled asphalt mixture could be explained in mesoscopic perspective. It proved that the virtual simulation test of the mechanical test was effective. The damage process of recycled asphalt mixture was analyzed in mesoscopic perspective, and the unification of mechanical response and macroscopic appearance was completed. Meanwhile, the simulation method of mesoscopic mechanics was an effective supplement to traditional tests, and guided tests method theoretically.

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