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Rheological master curves for modified asphalt binders
, Article Scientia Iranica ; Volume 20, Issue 6 , 2013 , Pages 1654-1661 ; 10263098 (ISSN) ; Tabatabaee, N ; Sharif University of Technology
Sharif University of Technology
2013
Abstract
Modified bitumen enhances the performance properties of asphalt mixtures. A number of studies in the last decade have evaluated the performance properties of modified binders at different service temperatures. It is however possible to evaluate some modified binder time-temperature characteristics and performance properties through their rheological master curves. In this research, styrene butadiene styrene, ethylene vinyl acetate, polyphosphoric acid and crumb rubber were used to modify a PG58-22 base binder. Rheological master curves for |G∗| and phase angles of these binders were generated using data from the dynamic shear rheometer and bending beam rheometer at temperatures ranging from...
Evaluation of rheological master curve models for bituminous binders
, Article Materials and Structures/Materiaux et Constructions ; Volume 48, Issue 1-2 , January , 2015 , Pages 393-406 ; 13595997 (ISSN) ; Tabatabaee, N ; Naderi, K ; Partl, M. N ; Sharif University of Technology
Kluwer Academic Publishers
2015
Abstract
Master curves of asphalt binders and mixtures have been traditionally used to evaluate their rheological behavior in the linear viscoelastic range. Different analytical models are available to describe the master curves of bituminous binders and mixtures. No models are currently considered universal for all modeling purposes. In this research, the general structure and capabilities of some of the most commonly used analytical models were investigated. Then, based on the patterns of phase angle master curves of ten neat and modified asphalt binders, four groups of master curve shapes were defined. The goodness of fit of the models for the different groups of master curves was used to develop...
Evaluation and Modeling of Modified Binders Master Curves
, Ph.D. Dissertation Sharif University of Technology ; Tabatabaee, Nader (Supervisor)
Abstract
With a surge in consumption of modified binders in recent years, different methods have been used to evaluate the properties of modified binders with relative success. None of these methods are able to fulfill all the requirements for evaluation and intrerpretation of the physical, chemical and rheologocal properties of modified binders. Since rheological master curves can present a mechanical interpretation of the binders in a wide range of times and temperatures, in conjunction with other evaluation metheods, they are considered a promising means of evaluating the suitability of modified bindrers. The available master curve models do not possess the sufficient diversity for this purpose....
An empirical model for modified bituminous binder master curves
, Article Materials and Structures/Materiaux et Constructions ; Volume 46, Issue 9 , December , 2013 , Pages 1459-1471 ; 13595997 (ISSN) ; Tabatabaee, N ; Naderi, K ; Partl, M ; Sharif University of Technology
2013
Abstract
Modeling the mechanical behavior of asphalt binders and mixtures has been the subject of intensified research in recent decades. Master curves of the norm of the complex modulus |G*| in the linear viscoelastic domain are frequently used for modeling, while phase angle master curves are less frequently considered for this purpose. Therefore in this research, an empirical model is introduced for phase angle master curves of modified and neat bituminous binders. The model is based on a general form of a double-logistic (DL) mathematical function. The |GG*| master curve was then modeled using a mutual relationship between the phase angle and |GG*|. Master curves of three neat and seven modified...
Utilization of percolation approach to evaluate reservoir connectivity and effective permeability: A case study on North Pars gas field
, Article Scientia Iranica ; Vol. 18, issue. 6 , December , 2011 , p. 1391-1396 ; ISSN: 10263098 ; Masihi, M ; Pishvaie, M ; Shojaei, A ; King, P. R ; Sharif University of Technology
Abstract
Reservoir characterization, especially during early stages of reservoir life, is very uncertain, due to the scarcity of data. Reservoir connectivity and permeability evaluation is of great importance in reservoir characterization. The conventional approach to addressing this is computationally very expensive and time consuming. Therefore, there is a great incentive to produce much simpler alternative methods. In this paper, we use a statistical approach called the percolation theory, which considers a hypothesis wherein the reservoir can be split into either permeable (i.e. sand/fracture) or impermeable flow units (i.e. shale/matrix), and assumes that the connectivity of permeability...
Evaluating the Low Temperature Behavior of Master Curves of Modified Binder and Investigating the a Parameter in Las Test
, M.Sc. Thesis Sharif University of Technology ; Tabatabaee, Nader (Supervisor)
Abstract
Master curves describe the behavior of asphalt binders over a wide range of temperatures and loading frequencies which are utilized by various predictive models in design and analysis procedure of asphalt mixtures. Frequency sweep test is extensively used for construction of master curves within the temperature range of 4 ̊C to 82◦̊C and frequency range of 0.01 to 30 Hz. There is a concern that master curves are unable to accurately represent the low temperature (below 4 C) behavior of binders. In this study a new cyclic loading pattern for the bending beam rheometer (BBR) test was utilized to conduct the low temperature tests and generate an isotherm compliance curve for incorporating the...
Utilization of percolation approach to evaluate reservoir connectivity and effective permeability: A case study on North Pars gas field
, Article Scientia Iranica ; Volume 18, Issue 6 , December , 2011 , Pages 1391-1396 ; 10263098 (ISSN) ; Masihi, M ; Pishvaie, M ; Shojaei, A ; King, P. R ; Sharif University of Technology
2011
Abstract
Reservoir characterization, especially during early stages of reservoir life, is very uncertain, due to the scarcity of data. Reservoir connectivity and permeability evaluation is of great importance in reservoir characterization. The conventional approach to addressing this is computationally very expensive and time consuming. Therefore, there is a great incentive to produce much simpler alternative methods. In this paper, we use a statistical approach called the percolation theory, which considers a hypothesis wherein the reservoir can be split into either permeable (i.e. sand/fracture) or impermeable flow units (i.e. shale/matrix), and assumes that the connectivity of permeability...
Master sintering curves of a nanoscale 3Y-TZP powder compacts
, Article Ceramics International ; Volume 35, Issue 2 , 2009 , Pages 547-554 ; 02728842 (ISSN) ; Simchi, A ; Dourandish, M ; Golestani Fard, F ; Sharif University of Technology
2009
Abstract
The sintering behavior of commercially available granulated ZrO2-3 mol% Y2O3 (3Y-TZP) powder compacts with an aggregate size of 75 nm was studied. The shrinkage response of the powder compacts during non-isothermal sintering was measured in a sensitive dilatometer at different heating rates. Densification and grain growth were also studied after isothermal firing in air according to different sintering cycles. The sintering and grain growth activation energy was estimated to be QS = 485 ± 12 kJ mol-1 and QG = 546 ± 23 kJ mol-1, respectively. Using the estimated Q-values, the master curves for sintering and grain growth were established and used for prediction of the densification and...