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    Evaluation of performance-based mix design for asphalt mixtures containing Reclaimed Asphalt Pavement (RAP)

    , Article Construction and Building Materials ; Volume 235 , 2020 Sabouri, M ; Sharif University of Technology
    Elsevier Ltd  2020
    Abstract
    In this research, the possibility of producing asphalt mixtures containing Reclaimed Asphalt Pavement (RAP) that perform well from both fatigue and rutting points of view was studied. For this, seven asphalt mixtures with varying RAP percentage and total binder content were produced. All other variables, including the gradation and binder type, were kept constant. To better control for the production variables, the mixtures were produced in the laboratory. Fatigue and rutting properties of the mixtures were evaluated using the Simplified Viscoelastic Continuum Damage (S-VECD) model and Triaxial Stress Sweep (TSS) test, respectively. Next, FlexPAVETM software was utilized to predict the... 

    Study of microstructural growth under cyclic martensite phase transition in shape memory alloys; A molecular dynamics approach

    , Article Journal of Intelligent Material Systems and Structures ; 2021 ; 1045389X (ISSN) Moravej, S. A ; Taghibakhshi, A ; Nejat Pishkenari, H ; Arghavani, J ; Sharif University of Technology
    SAGE Publications Ltd  2021
    Abstract
    Shape memory alloys are referred to as a group of alloys that can retrieve the permanent deformation and strain applied to them and eventually return to their original form. So far, various studies have been done to determine the behavior of these alloys under cyclic loading. Most of the studies have mainly been conducted by using the foundations of Continuum Mechanics in order to examine the properties of memory alloys. In this study, instead of using the Continuum Mechanics, a Molecular Dynamics simulation method using Lennard-Jones potential is utilized. The changes in the behavior and properties of memory alloy under cyclic loading are being examined. First, the functional form... 

    Multiple stress creep and recovery and time sweep fatigue tests: Crumb rubber modified binder and mixture performance

    , Article Transportation Research Record ; Issue 2180 , 2010 , Pages 67-74 ; 03611981 (ISSN) Tabatabaee, N ; Tabatabaee, H. A ; Sharif University of Technology
    2010
    Abstract
    Crumb rubber modification (CRM) is an effective means of improving neat asphalt performance. Numerous studies have investigated the effects of CRM using the current SuperpaveĀ® laboratory tests. Recent studies have shown that the assumption of linear viscoelastic behavior or employing insufficient stress or strain levels makes current tests inadequate for properly assessing the performance of binders, especially when modified. This problem has resulted in the development of improved test methods such as the time sweep binder fatigue test and the multiple stress creep and recovery (MSCR) test for permanent deformation. The present study assesses the performance of binders modified with a wide... 

    Effect of mineral fillers on the performance, rheological and dynamic viscosity measurements of asphalt mastic

    , Article Construction and Building Materials ; Volume 222 , 2019 , Pages 390-399 ; 09500618 (ISSN) Naveed, H ; ur Rehman, Z ; Hassan Khan, A ; Qamar, S ; Niaz Akhtar, M ; Sharif University of Technology
    Elsevier Ltd  2019
    Abstract
    The principal objective involved in this research is to explore the mechanical behaviour of the binder using different mineral fillers such as stone dust (SD), brick dust (BD) and fly ash Class F (FA). Currently, a large quantity of roads is being constructed under the China-Pakistan Economic Corridor (CPEC) project. It is a major concern for quality of road to with stand heavy loads. For the investigation of the quality of roads, it is mandatory to evaluate the behaviour of mineral fillers addition in asphalt mastic. Fatigue cracking, thermal cracking and permanent deformation have been found a major common distress in the construction of road networks. In this study, the behaviour of... 

    On the modeling of human intervertebral disc annulus fibrosus: Elastic, permanent deformation and failure responses

    , Article Journal of Biomechanics ; Volume 102 , 2020 Ghezelbash, F ; Shirazi Adl, A ; Baghani, M ; Eskandari, A. H ; Sharif University of Technology
    Elsevier Ltd  2020
    Abstract
    As a primary load-resisting component, annulus fibrosus (AF) maintains structural integrity of the entire intervertebral disc. Experiments have demonstrated that permanent deformation and damage take place in the tissue under mechanical loads. Development of an accurate model to capture the complex behaviour of AF tissue is hence crucial in disc model studies. We, therefore, aimed to develop a non-homogenous model to capture elastic, inelastic and failure responses of the AF tissue and the entire disc model under axial load. Our model estimations satisfactorily agreed with results of existing uniaxial (along fiber, circumferential and axial directions) and biaxial tissue-level tests. The...