Atul Narayan

Atul Narayan
Indian Institute of Technology Madras | IIT Madras · Department of Civil Engineering

Doctor of Philosophy

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28
Publications
1,726
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145
Citations
Introduction
Skills and Expertise

Publications

Publications (28)
Chapter
This investigation reports the use of stress-strain-time data for different frequencies at a given temperature for computing the retardation spectra. While the existing attempts use a master curve based approach with continuous relaxation spectra, the use of a discrete retardation spectrum at a given temperature directly computed from the model par...
Article
The distress of asphalt pavements on horizontal curves can be relatively higher because of the lateral load transfer and the increase in lateral forces on vehicles during their cornering manoeuvre. In this study, the lateral load transfer in horizontal curves and its effect on pavement disstress is evaluated using a commercial vehicle dynamics soft...
Article
The modulus of asphalt concrete that is conventionally obtained from large amplitude oscillations (LAOs) in fatigue tests cannot be considered a material property since the response changes from cycle to cycle. It is necessary to determine how viscoelastic properties vary with the extent of damage, and they cannot be obtained from LAOs without maki...
Article
Wet granular materials develop both shear stresses and normal stresses during simple shear. Over a certain range of shear rate levels, both the shear stress and the normal stress that develop are linearly proportional to the shear rate. In addition, such materials exhibit permanent increase in volume during simple shear. In this article, a model is...
Article
Payne effect is the complex nonlinear response of filled elastomers to oscillatory loading. Although usually characterized by the decrease in the storage modulus with strain amplitude, and by the bell-shaped curve of loss modulus with strain amplitude, the response has many other peculiar features. The manner of decrease in storage modulus with str...
Article
Full-text available
The Payne effect, the nonlinear mechanical behavior of filled elastomers in oscillatory loading conditions, has received considerable attention in the literature. This is because of the extensive use of these materials in different industrial applications. While experimental investigations of the Payne effect have been comprehensive, the models dev...
Article
The four-point beam (4PB) test is extensively used to characterize the fatigue behavior of asphalt concrete mixtures. But the inhomogeneity of the deformation in the beam is not given due consideration in traditional analyses of these tests. During bending, the strain in the beam varies both along the length and depth of the beam. Consequently, dif...
Article
Elastomers, plastomers, and Reactive Ethylene Terpolymers (RETs) are some of the most commonly used polymers for modification of bitumen. Each type of modifier can have a considerably different influence on the rheological behavior of the binders and therefore, the performance of bituminous mixtures in pavements. In this study, for comparing the ef...
Article
Ranking of asphalt binders based on the permanent deformation characteristics of the respective mixtures is important for designing mixtures for pavements. While various tests on binders and corresponding parameters have been suggested for ranking asphalt binders, their applicability is limited since many of these parameters fail to characterise th...
Article
One of the ways of determining the properties of granular materials is to subject the material to a triaxial state of stress with three distinct eigenvalues, in a cubical tri-axial testing equipment, the material tested being in a static state. A constitutive relation for granular materials that does not allow the body to be in tri-axial static equ...
Article
In this paper, a Helmholtz-potential-based thermodynamic approach was developed for modelling fluids that exhibit both yielding and thixotropic behavior. The yielding behavior was captured using a framework of multiple natural configurations. The thixotropy was described using a structural parameter. The Helmholtz potential is made a function of a...
Chapter
Full-text available
Moisture in asphalt concrete (AC) pavements does not only cause distresses like potholes, ravelling, etc. but also exacerbates distresses like fatigue and rutting. Moisture susceptibility of AC mixtures is usually characterized using the Modified Lottman Test (AASHTO T283) adopted in Superpave mix design. This test has been observed to provide a go...
Article
Full-text available
Different methods are available to quantify the fatigue damage of the asphalt mixtures. Among these, methods based on the concept of dissipated energy are used predominantly. Characterizing fatigue damage using the concept of dissipated energy is complicated due to the presence of other modes of dissipation, for instance, viscous dissipation. Hence...
Article
Failure of asphalt concrete in repeated loading tests could be due to fatigue or due to creep of the material. In this study, the effect of creep on the damage of asphalt concrete in these tests was investigated. Stress-controlled repeated loading tests were conducted in uniaxial tension at different frequencies. A different stress amplitude was ch...
Conference Paper
Because of the dynamics of vehicle-pavement interaction, the magnitude of the load transferred to the pavement can be significantly higher than that transferred in static conditions. However, the dynamic loading history is usually such that loads of relatively higher magnitude occur over shorter periods of time, and hence have shorter residence tim...
Article
The mechanical behavior of asphalt binder is highly sensitive to temperature. The manner in which mechanical characteristics change with temperature can also vary significantly from one asphalt to another. With such variations, grading the rutting resistance of the binder by measuring a mechanical parameter of the binder at a single temperature wil...
Article
Rutting is one of the most common distresses observed in bituminous pavements. A number of test procedures, associated parameters, and correlations have been developed for the binder and the mixture to evaluate their rutting performance. In this investigation, the rutting performance of an unmodified, and three modified binders (Elastomer, Plastome...
Conference Paper
Full-text available
The Time Sweep (TS) test and the Linear Amplitude Sweep (LAS) test are two of the most widely accepted tests for characterizing fatigue resistance of asphalt binders. Both tests involve oscillatory loading on bitumen specimen using a dynamic shear rheometer (DSR) with parallelplate geometry. Asphalt cement is subjected to a sinusoidal loading with...
Article
This is a study of the temperature dependence of the mechanical behaviour of asphalt binders. Creep-recovery and steady-shear experiments were conducted on selected modified and unmodified binders at 60, 70 and 80 C, and the results were used to characterise the binders using a nonlinear viscoelastic model. Experimental and model parameters obtaine...
Article
Several prediction criteria have been proposed to rank asphalt binders based on their rutting performance, and each one has been shown to be able to predict rutting behavior observed in either accelerated loading field tests or under highway traffic with some level of success. In this study, an analysis of these rutting prediction criteria was cond...
Article
Many researchers have asserted the importance of considering the nonlinearity of the mechanical behavior of asphalt binders for accurately estimating their performance under field conditions, and for comparing and ranking them accordingly. To do so, it is necessary to have a robust and reliable nonlinear viscoelastic theory and a model derived unde...
Article
In a recent article, Narayan et al. [Narayan, S.P.A., et al., 2012b. Nonlinear viscoelastic response of asphalt binders: experimental study of relaxation of torque and normal force in torsion. Mechanics Research Communications, 43, 66-74] recorded both torque and normal force in torsional relaxation experiments on asphalt binders. The data are thre...
Article
In this short paper we study the counterpart, within the context of a general class of fluids, of two famous unsteady flows originally studied by Stokes, within the context of Navier–Stokes fluid, namely Stokes’ first and second problems. The class of fluids considered, stress power-law fluids, are capable of stress thinning or stress thickening an...
Article
Full-text available
Development of normal stress in the direction perpendicular to the plane of shear is an important feature of the nonlinear viscoelastic behavior of asphalt binders. Here, we study the significance of this phenomenon with the help of stress-relaxation experiments in torsion. We conducted these experiments using a dynamic shear rheometer on an unmodi...
Article
This paper presents the results of a set of transient experiments conducted on asphalt binders that serve to highlight the nonlinearity of the viscoelastic response of asphalt binders. Two grades of binders were used in this study. A transient test that combines both creep and stress relaxation tests was conducted using a dynamic shear rheometer at...

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