Effects of Aging on Viscoelastic Properties of Asphalt-Aggregate Mixtures

1998 ◽  
Vol 1630 (1) ◽  
pp. 21-27 ◽  
Author(s):  
Jo Sias Daniel ◽  
Y. Richard Kim ◽  
Hyun-Jong Lee
Keyword(s):  
Asphalt Concrete ◽  
Material Properties ◽  
Dynamic Modulus ◽  
Viscoelastic Properties ◽  
Correspondence Principle ◽  
Creep Compliance ◽  
Relaxation Modulus ◽  
Fatigue Performance ◽  
Concrete Mixtures ◽  
Effects Of Aging

The effects of aging on asphalt-aggregate mixtures is a topic that has been gaining attention in recent years. Of special interest is how the fatigue performance of asphalt concrete mixtures changes with time because of changing material properties. The fatigue performance of a mixture is related to its viscoelastic material properties. An investigation of the effects of aging on viscoelastic properties of an asphalt-aggregate mixture, such as creep compliance, relaxation modulus, dynamic modulus, and phase angle, is discussed in this paper. The framework for including the effect of aging in an existing uniaxial constitutive model is established, and the applicability of Schapery’s elastic-viscoelastic correspondence principle to aged mixtures is validated.

scholarly journals Comparative Analysis of Viscoelastic Properties of Open Graded Friction Course under Dynamic and Static Loads

Polymers ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1250
Author(s):  
Liding Li ◽  
Chunli Wu ◽  
Yongchun Cheng ◽  
Yongming Ai ◽  
He Li ◽  
...  
Keyword(s):  
Dynamic Modulus ◽  
Viscoelastic Properties ◽  
Functional Relationship ◽  
Creep Compliance ◽  
Relaxation Modulus ◽  
Creep Tests ◽  
Static Loads ◽  
Burgers Model ◽  
Viscoelastic Parameters ◽  
Open Graded Friction Course

The viscoelastic properties of open graded friction course (OGFC) are closely related to anti-permanent deformation ability, noise reduction ability and durability. To study the viscoelastic parameters of OGFC under dynamic and static loads and to establish the functional relationship between them, uniaxial compression creep tests and dynamic modulus tests were performed to obtain the creep compliance and the dynamic modulus of OGFC. In addition, the Burgers model, modified Burgers model, second-order extensive Maxwell model, Scott-Blair model and modified Sigmoid model were employed to quantitatively analyze the dynamic and static viscoelastic properties of OGFC. Subsequently, the relaxation modulus of OGFC was deduced by the viscoelastic theory. Then, the dynamic modulus of OGFC was calculated according to the deduced relaxation modulus. Based on the calculated values and the measured values of dynamic modulus, the functional relationship of viscoelastic parameters of OGFC under dynamic and static loads was established. The results show that the increase in test temperature has adverse effects on the viscoelastic indexes of OGFC, such as creep compliance, relaxation modulus, and dynamic modulus; the dynamic modulus derived from static creep compliance has a good linear correlation with that obtained by dynamic modulus tests, but the correlation of the phase angle is poor.

Evaluation of Fatigue Life of Asphalt Concrete From Dynamic Modulus Test

2017 ◽  
Author(s):  
Md Mehedi Hasan ◽  
Hasan M. Faisal ◽  
Biswajit K. Bairgi ◽  
A. S. M. Rahman ◽  
Rafiqul Tarefder
Keyword(s):  
Fatigue Life ◽  
Asphalt Concrete ◽  
Dynamic Modulus ◽  
Performance Testing ◽  
Fatigue Performance ◽  
Construction Sites ◽  
Reclaimed Asphalt ◽  
Wide Range ◽  
Dynamic Modulus Test ◽  
Study Laboratory

Asphalt concrete’s dynamic modulus (|E*|) is one of the key input parameters for structural design of flexible pavement according to the Mechanistic Empirical Pavement Design Guide (MEPDG). Till this day, pavement industry uses |E*| to predict pavement performance whether the material is hot mix asphalt (HMA) or warm mx asphalt or Reclaimed Asphalt Pavement (RAP) mixed HMA. However, it is necessary to investigate the correlation of |E*| with laboratory performance testing. In this study, laboratory dynamic modulus test was conducted on four different asphalt concrete mixtures collected from different construction sites in the state of New Mexico and mastercurves were obtained to evaluate dynamic modulus (|E*|) for a wide range of frequency. In addition, fatigue performance of these mixtures was predicted from the mastercurves and compared with the laboratory fatigue performance testing. Fatigue performance of these mixtures was evaluated from the four point beam fatigue test. The laboratory results show a good agreement with the predicted value from mastercurves. It is also observed from this study that the fatigue life of the asphalt concrete materials decreases with increase in |E*| value.

Investigation of factors affecting dynamic modulus and phase angle of various asphalt concrete mixtures

2015 ◽  
Vol 49 (3) ◽  
pp. 857-868 ◽  
Author(s):  
Yasir Ali ◽  
Muhammad Irfan ◽  
Sarfraz Ahmed ◽  
Shahab Khanzada ◽  
Tariq Mahmood
Keyword(s):  
Phase Angle ◽  
Asphalt Concrete ◽  
Dynamic Modulus ◽  
Factors Affecting ◽  
Concrete Mixtures

Dynamic Modulus Prediction of Asphalt Concrete Mixtures through Computational Micromechanics

2015 ◽  
Vol 2507 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Pravat Karki ◽  
Yong-Rak Kim ◽  
Dallas N. Little
Keyword(s):  
Finite Element ◽  
Asphalt Concrete ◽  
Dynamic Modulus ◽  
Fine Aggregate ◽  
Concrete Mixtures ◽  
Mixture Phase ◽  
Linear Viscoelastic ◽  
Stiffness Characteristics ◽  
Micromechanics Modeling ◽  
Computational Micromechanics

This paper presents a computational micromechanics modeling approach to predict the dynamic modulus of asphalt concrete mixtures. The modeling uses a finite element method combined with the micromechanical representative volume element (RVE) of mixtures and laboratory tests that characterize the properties of individual mixture constituents. The model treats asphalt concrete mixtures as heterogeneous with two primary phases: a linear viscoelastic fine aggregate matrix (FAM) phase and a linear elastic aggregate phase. The mechanical properties of each phase were experimentally obtained by conducting constitutive tests: oscillatory torsion tests for the viscoelastic FAM phase and quasistatic nanoindentation tests for the elastic aggregate particles. Material properties of each mixture phase were then used in the finite element simulation of two-dimensional mixture microstructures obtained from digital image processes of asphalt concrete mixtures. Model simulations were compared with the experimental dynamic moduli of asphalt concrete mixtures. Simulation results indicated that the micromechanical approach based on the mixture microstructure and phase properties could fairly predict the overall mixture properties that are typically obtained from laboratory mixture tests. Furthermore, the RVE dimension of 60 mm might be used to predict the undamaged viscoelastic stiffness characteristics of asphalt concrete mixtures with reduced computing efforts.

scholarly journals Characterization of Various Plant-Produced Asphalt Concrete Mixtures Using Dynamic Modulus Test

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
Muhammad Irfan ◽  
Asad S. Waraich ◽  
Sarfraz Ahmed ◽  
Yasir Ali
Keyword(s):  
Asphalt Concrete ◽  
Dynamic Modulus ◽  
Prediction Models ◽  
Compressive Loading ◽  
Asphalt Mixture ◽  
Statistical Technique ◽  
Loading Frequency ◽  
Concrete Mixtures ◽  
Dynamic Modulus Test ◽  
Stress Dependent

This research characterizes the performance of various plant-produced asphalt concrete mixtures by dynamic modulus|E∗|test using asphalt mixture performance tester (AMPT). Marshall designed specimens of seven different mixtures were prepared using the Superpave gyratory compactor and subjected to sinusoidal compressive loading at various temperatures (4.4 to 54.4°C) and loading frequencies (0.1 to 25 Hz). A catalog of default dynamic modulus values for typical asphalt concrete mixtures of Pakistan was established by developing stress-dependent master curves separately, for wearing and base course mixtures. The sensitivity of temperature and loading frequency on determination of dynamic modulus value was observed by typical isothermal and isochronal curves, respectively. Also, the effects of various variables on dynamic modulus were investigated using statistical technique of two-level factorial design of experiment. Furthermore, two dynamic modulus prediction models, namely, Witczak and Hirsch, were evaluated for their regional applicability. Results indicated that both the Witczak and Hirsch models mostly underpredict the value of dynamic modulus for the selected conditions/mixtures. The findings of this study are envisaged to facilitate the implementation of relatively new performance based mechanistic-empirical structural design and analysis approach.

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