Pejoohan Tavassoti

Pejoohan Tavassoti
University of Waterloo | UWaterloo · Department of Civil and Environmental Engineering

Ph.D.

About

31
Publications
6,893
Reads
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207
Citations
Introduction
Dr. Pejoohan Tavassoti is an Assistant Professor and the Jr. Norman W. McLeod Chair in Sustainable Pavement Engineering at the Department of Civil and Environmental Engineering and the Centre for Pavement and Transportation Technology (CPATT) at the University of Waterloo. His research majorly cover design and characterization of Civil Engineering Materials; Pavement Design and Modelling; Nondestructive Testing (NDT); Sustainable Construction Technologies; and Smart and Innovative Materials.
Additional affiliations
October 2018 - June 2021
University of Waterloo
Position
  • Senior Research Associate
September 2016 - October 2018
Pennsylvania State University
Position
  • Professor (Assistant)
August 2012 - January 2013
Pennsylvania Sate University
Position
  • Instructor
Description
  • Civil Engineering Materials Laboratory (CE 337): The course consisted of 14 lectures (45 minutes) followed by experiments (up to 3 hours) to assess the properties of civil engineering materials.
Education
August 2012 - August 2016
Pennsylvania State University
Field of study
  • Civil Engineering (Major :Materials and Geotechnical Engineering)
September 2007 - February 2010
Khaje Nasir Toosi University of Technology
Field of study
  • Civil Engineering (Pavements, Highway, and Transportation Engineering)
September 2003 - June 2007
University of Guilan
Field of study
  • Civil Engineering

Publications

Publications (31)
Article
Cold recycling of pavements utilizes nearly 100% of the reclaimed asphalt pavement (RAP) for pavement rehabilitation. Due to the large amount of RAP, the cold recycled mixes would become prone to fatigue cracking, and hence evaluation of their fatigue performance becomes highly important. In this study, three cold recycled asphalt mixes were prepar...
Chapter
Asphalt Cements (ACs) are typically characterized within their Linear Viscoelastic (LVE) range, where they are treated as thermo-rheologically simple materials. Such assumption simplifies characterization of asphalt behaviour over a wider range of time- and temperature-varying conditions by applying time-temperature superposition principle. However...
Chapter
The stiffness of bituminous mixtures varies with temperature and frequency of load due to its viscoelastic nature, and this behavior is represented by the modulus master curve. This curve can be constructed using laboratory test results and models based on known material properties. This approach uses material specifications to provide a good estim...
Article
The use Styrene-Butadiene-Styrene (SBS) modification of asphalt cement is considered as one of the effective ways to improve pavement performance. The increase in stiffness and the improved elastic response of the asphalt cement provide pavements with better rutting and fatigue resistance. On the other hand, cracking resistance in asphalt cement ha...
Conference Paper
Climate change impacts, especially in terms of rising temperatures and changes in precipitation patterns, have been widely noted in several regions in Canada during the past two decades. Such remarkable changes raise concerns about pavement serviceability, since both temperature and excess precipitation can ultimately affect the pavement materials...
Article
Use of additives and modifiers as an effective alternative to mitigate premature cracking of flexible pavements has been gaining popularity during the past three decades. Several studies have discussed the advantages and disadvantages of using various types of fibers in pavement industry. The objective of this study is to evaluate the impact of usi...
Conference Paper
Full-text available
Moisture-induced damage is among the four prevalent causes of premature failure of flexible pavements in Canada. Research on moisture damage evaluation of asphalt concrete mixtures dates back to approximately one century ago. However, relating the field performance of mixes to their associated properties captured through laboratory test methods is...
Article
Full-text available
Utilizing recycled asphalt pavements (RAP) in pavement construction is known as a sustainable approach with significant economic and environmental benefits. While studying the effect of high RAP contents on the performance of hot mix asphalt (HMA) mixes has been the focus of several research projects, limited work has been done on studying the effe...
Conference Paper
Full-text available
Within the past two decades, various warm mix asphalt technologies (WMA) have been introduced with the goal of mix production at lower temperature as compared to the traditional hot mix asphalt (HMA). Effect of the WMA additives on the rheology of binders and mechanical properties of the mixes have been well investigated by several researchers. How...
Article
Full-text available
Resonant Column (RC) test has been used as a nondestructive test (NDT) to study dynamic properties of soils for the past few decades. With some modifications, this test can also be employed to characterize properties of asphalt concrete especially since these properties are strongly dependent on the loading frequency. A conventional RC apparatus wa...
Article
Full-text available
The impact resonance test is a free vibration-based nondestructive test method that has been increasingly used in evaluation and characterization of asphalt concrete for the past two decades. The rheological modeling of the impact resonance test is conceptualized by a linear viscous damping mechanism having single degree of freedom whose equation o...
Conference Paper
Full-text available
Proper characterization of asphalt concrete mixtures with respect to the changes in dynamic modulus (DM) with the applied loading frequency and test temperature is a key task for pavement structural design. This phenomenon is generally described through the use of a modulus master curve, which is an important input for mechanistic empirical pavemen...
Article
Asphalt concrete behavior is heavily dependent on temperature and loading rate. Hence, the material is typically tested at a range of temperatures and loading frequencies to capture its properties. Results are then used to develop a master curve exhibiting material behavior at the full spectrum of loading frequencies. An abbreviated testing protoco...
Conference Paper
Full-text available
Changes in Dynamic Modulus (DM) of asphalt concrete as a function of loading frequency and test temperature is a key parameter for mechanistic empirical design of flexible pavements. Due to equipment limitations, modulus is generally measured at loading frequencies below 25 Hz. Thus, a modulus master curve is commonly used to extrapolate material p...
Article
Full-text available
Using recycled materials in construction of asphalt pavements yields both economic and technical advantages. Recycled asphalt shingles (RAS) and reclaimed asphalt pavement (RAP) are two major sources to serve this purpose for which proper design and characterization are key elements. In this study, engineering properties of asphalt concrete contain...
Article
Full-text available
As the usage of warm mix asphalt (WMA) has gained popularity in recent years, the need has arisen for more characterization techniques and performance prediction through accelerated laboratory testing. This paper presents an experimental study on the shear modulus and damping ratio of asphalt specimens prepared using three WMA technologies: Evother...
Article
Full-text available
Modification of the asphalt binder is one approach taken to improve Asphalt pavement performance. Rutting is one of the most important factors that could reduce the life of asphalt pavements.Nowadays, the application of nanotechnologyto achieve materials that are more resistant is expanding in asphalt pavement thatNano-TiO2 is among the most excitin...
Article
Full-text available
Recently, significant advancements in the modeling of asphalt concrete have been made in micromechanics to describe the behavior and performance of asphalt pavements using the properties of their component materials. On the other hand, this approach has great potential benefits in the field of asphalt technology for reducing or eliminating costly t...
Conference Paper
Asphalt concrete is predominantly used as a construction material for flexible pavements. Besides all of the advantages of flexible pavements, their resistant to heavy loading, especially in regions with hot weather conditions, is a matter of concern. In other words, low resistance to permanent deformation or so-called rutting would be the most imp...
Conference Paper
Full-text available
Asphalt concrete is predominantly used as a construction material for flexible pavements. Besides all of the advantages of flexible pavements, their resistance to heavy loading, especially in regions with hot weather conditions, is a matter of concern. In other words, low resistance to permanent deformation or so-called rutting would be the most im...
Conference Paper
To gain further insight into the interaction among the mix constituents, researchers utilized numerical simulation techniques, such as the Finite Element Method (FEM) and the Discrete Element Method (DEM). The Discrete Element Method was primarily introduced for the analysis of rock-mechanics and granular materials. In recent years, DEM has also be...
Conference Paper
Full-text available
To gain further insight into the interaction among the mix constituents, researchers utilized numerical simulation techniques, such as the Finite Element Method (FEM) and the Discrete Element Method (DEM). The Discrete Element Method was primarily introduced for the analysis of rock-mechanics and granular materials. In recent years, DEM has also be...
Article
Full-text available
In years past, structural evaluations of pavement were made using empirical relationships combined with destructive testing. More recently, these destructive methods have been largely replaced by Non-Destructive test (NDT) methods. In addition, there are established graphical procedures for estimating the stiffness properties of Hot Mixed Asphalt (...
Conference Paper
Full-text available
It is generally agreed that fatigue cracking is one of the principal distress types to be considered for flexible pavement design. Therefore, resistance of asphalt mixes to fatigue cracking is one of the most important characteristics of asphaltic materials. Method of fabrication, mode of loading, asphalt mixture parameters, and the loading and env...
Conference Paper
Full-text available
The effects of air and water on deterioration of asphalt mixtures, known as durability, continue to present a challenge. The action of water and water vapor may cause moisture damage, including a reduction in mixture stiffness and stripping of the binder from the aggregate. A reduction in cohesion results in a reduction in strength and stiffness. T...
Article
Non-destructive methods for materials testing based on propagation of sonic and ultrasonic waves are being increasingly used in testing engineering materials. However, the use of ultrasonic pulse wave velocity (UPV) test has seen limited use on HMA mixtures and a new test procedure needs to be developed to fully exploit the potential of the ultraso...

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