قائمة الطعام
To reveal the potential influence of styrene-butadiene-styrene (SBS) polymer modification on the anti-aging performance of asphalt, and its mechanism, we explored the aging characteristics of base asphalt and SBS-modified asphalt by reaction force field (ReaxFF) and classical molecular dynamics simulations. The results illustrate that the SBS asphalt is more susceptible to oxidative …
performance. Furthermore, the asphalt performance aging variations (penetration aging index, softening point increment, ductility aging index, and G*/sin aging index) decreased signi cantly due to the introduction of PPA. It was shown that the e ects of UV aging on the behaviors of asphalt and asphalt mixture were constrained with the addition ...
They used asphalt-aging tests to determine the relevant kinetic parameters needed in the aging kinetics equation. They found that the asphalt-aging reaction perfectly fits to the first order kinetics equation, and during the asphalt-aging process, the asphalt had a higher activation energy and a lower reaction rate coefficient.
ASTM D6521-08, Standard Practice for Accelerated Aging of Asphalt Binder Using a Pressurized Aging Vessel (PAV), American Society for Testing Materials, West Conshohocken, Pennsylvania, 2005. Google Scholar [3] M.N. Siddiqui and M.F. Ali, Studies on the aging behavior of the Arabian asphalts, Fuel, 78(1999), p.1005.
recovered asphalt cement and to develop an improved chemical aging method that provides asphalt cement that more closely reflects properties after 8-10 years of service. Physical testing of the asphalt cements was done using a bending beam rheometer (BBR) and double-edge-notched tension (DENT) test for laboratory aged material as well as
In addition, considering the aging behavior of asphalt may be caused by a long high temperature environment, but it is difficult to quantify the aging behavior in the preparation process due to the addition of different modifiers at different preparation stages.
the aging behavior of rubber asphalt under the coupling e ect of di erent environmental factors. Based on the short-term aging, this study used a self-made UV environment simulation chamber to carry out UV aging of base asphalt and rubber asphalt in di erent environments of water, acid and salt.
They used asphalt-aging tests to determine the relevant kinetic parameters needed in the aging kinetics equation. They found that the asphalt-aging reaction perfectly fits to the first order kinetics equation, and during the asphalt-aging process, the asphalt had a higher activation energy and a lower reaction rate coefficient.
The 3 Stages of Asphalt Shingle Aging and Deterioration. All roof materials have a shelf life, including asphalt shingles. From manufacture to the point of functional failure, these rectangular flaps usually only last for up to 50 years.
AbstractTerminal blend rubberized asphalt (TBRA) is widely used as binder of asphalt mixtures due to its technical characteristics of storage stability. However, its road performance deteriorates due to the aging process of TBRA. The purpose of this study is to evaluate the aging characteristics of TBRA binders containing 0%, 5%, 10%, 15%, and 20% content […]
Abstract. In recent years, the evaluation of aging behavior of different types of asphalt mixture has become an important research field in pavement engineering. The short-term and long-term aging properties of reclaimed asphalt concrete (RAC) under the effects of vegetable/mineral oil rejuvenators are introduced in this research.
After aging, the asphalt exhibited an improved high-temperature performance owing to the transformation of light components to heavy components, and therefore, the value of ln A was greater than that of the composite-modified asphalt before aging. As the silica fume content was increased, the range of increase of ln A also gradually increased.
This paper discusses the behavior of UV aging on asphalt performance of five binders and mixtures by experiment. The results show that binders' physical aging behavior is highly consistent with its rheological properties; the low-temperature flow …
This paper discusses the behavior of UV aging on asphalt performance of five binders and mixtures by experiment. The results show that binders' physical aging behavior is highly consistent with ...
The aging behaviour and mechanism of styrene-butadiene-styrene (SBS)-modified asphalt has been investigated based on laboratory tests in this study. Rolling thin-film oven (RTFO) test and pressure-aging-vessel (PAV) test were conducted to prepare aged SBS-modified asphalt. Conventional property tests, including penetration, soften point, and ...
However, the aging mechanism of biorejuvenated asphalt at a microscale is not well-understood. The microscale analysis provides a way to acknowledge how the biorejuvenator works. Therefore, this study aims to characterize the physical-structural and chemical changes of biorejuvenated asphalts of different aging levels at a microscale.
1 Impact of Aging on Cracking Behavior of Asphalt Mixtures 2 Reyhaneh Rahbar-Rastegar1, Jo Sias Daniel2, Eshan V. Dave3 3 （1Research Engineer, Purdue University, IN, USA, [email protected]) 4 （2Professor, University of New Hampshire, NH, USA, [email protected]) 5 （3Assistant Professor, University of New Hampshire, NH, USA, [email protected])
The aging of bitumen has a significant impact on the mechanical behavior of asphalt. This aging is carried out at the mixing operation with the aggregates generally at 163°C in the case of pure mixtures or at temperatures higher than in the case of the modification by polymers or industrial waste. This paper presents experimental results of a study of the rheological behavior of a class of ...
The growth behavior of aging depth of asphalt can be divided into two stages, which can be characterized by a two-stage model. During 0–24 h, it accords with the power model; after 24 h, it ...
Although the aging asphalt and its regeneration were researched by many researchers, the poor low-temperature performance of regenerating asphalt has still not been solved yet. In this project, the composite technology of regeneration and modification will be used to solve the problem mentioned above. Through the investigation and analysis on the composite mechanism of …
The aging behavior of asphalt binders at the microscale is directly related to the macroscale properties. Therefore, the results and conclusions from this study may provide useful insight into identifying the aging state of asphalt binders.
Aging can significantly affect the viscoelastic properties and cracking behavior of asphalt mixtures, causing increase in stiffness, reduction in relaxation capability, and increase in brittleness. Eleven mixtures are evaluated using different laboratory conditioning protocols to evaluate how the properties of asphalt mixtures, including ...
Terminal blend rubberized asphalt (TBRA) is widely used as binder of asphalt mixtures due to its technical characteristics of storage stability. However, its road performance deteriorates due to the aging process of TBRA. The purpose of this study ...
Aging behaviors of styrene-butadiene-styrene copolymer (SBS)–modified asphalt are complex due to combined effects of hardening of asphalt matrix and degradation of SBS. In order to investigate aging mechanism of SBS-modified asphalt more clearly, a novel method to extract SBS modifier from SBS-modified asphalt was introduced in this paper.
glass transition behavior changed after asphalt oxidation. According to MD simulations, the moisture impacts on asphalt before and after oxidative aging are significant regarding bulk modulus and zero shear viscosity. Both bulk modulus and zero shear viscosity of asphalt decrease with an increase in moisture content in the asphalt.
The aging methods included thin film oven test (TFOT), pressure aging vessel (PAV) test and ultraviolet (UV) aging. The aging behavior and mechanism of asphalt were investigated by Peak force ...
Oxidative aging is a major issue in asphalt pavements that leads to hardening of the asphalt, which further contributes significantly to asphalt pavement embrittlement and eventually results in excessive pavement cracking. In addition, the performance of asphalt binder is also highly related to its service conditions which involve climatic conditions and traffic conditions, such as temperature ...
The rheological behaviors of the base asphalt, SBR-, SBR/sulfur-, SBR/PPA-modified asphalts before and after aging are shown from Fig. 1a–c. Complex viscosity η* as a fundamental rheological parameter is often used to express the contribution of asphalt binder to permanent deformation . With increasing complex viscosity, the high-temperature ...
The moisture aging effect and mechanism of asphalt binder during the in-service life of pavement were investigated by laboratory simulating tests. Pressure aging vessel (PAV) test simulating the long-term aging of binder during the in-service life of pavement was modified to capture the long-term moisture aging effect of binder. Penetration grade tests including penetration test, soften point ...
The aging behaviour and mechanism of styrene-butadiene-styrene (SBS)-modified asphalt has been investigated based on laboratory tests in this study. Rolling thin-film oven (RTFO) test and pressure ...
glass transition behavior changed after asphalt oxidation. According to MD simulations, the moisture impacts on asphalt before and after oxidative aging are significant regarding bulk modulus and zero shear viscosity. Both bulk modulus and zero shear viscosity of asphalt decrease with an increase in moisture content in the asphalt.
The aging behavior of oil modified binders was also captured in the mastic phase, which is a more representative state of the continuous phase in an asphalt pavement in …
The aging simulating tests of the SBS and SBS modified asphalt under the conditions of wet and dry are compared and the effect of water on the aging of modified asphalt was investigated by infrared spectroscopy analysis. The results showed that: after aging in the wet conditions the change range of asphalt performance increased. Infrared spectroscopy analysis results showed that the carbonyl ...
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