A cumulative damage model for predicting and assessing raveling in asphalt pavement using an energy dissipation approach
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Asphalt pavement
Lay description Asphalt pavements are made by mixing aggregates with asphalt binder, a black, glue-like substance obtained from crude oil refining. The combination of asphalt and aggregate is called an asphalt mixture. When asphalt pavements need to be removed and replaced, the asphalt mixture can be recycled and combined with new aggregate and asphalt for use in new asphalt pavements. However, engineers understand very little about how the recycled asphalt blends with the new asphalt. Both the new and old asphalt binders are black, and their chemical compositions are so similar. This makes it challenging to differentiate among new and old asphalt binders within an asphalt mixture without the addition of a tracer to one of the asphalts. Previous research has shown that adding a titanium dioxide tracer to the new asphalt binder enables distinguishing the new and recycled asphalt in an asphalt mixture, using X-ray analysis in a scanning electron microscope. However, previous studies have failed to evaluate the sample preparation on the distribution of the tracer within an asphalt mixture. This study overcomes these shortcomings and yields a reliable method for adding the tracer to the new binder and preparing asphalt mixtures samples for X-ray analysis.
Asphaltene
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Through component analysis of the asphalt materials,it can be find that natural asphalt contains more asphaltenes and resin.Incorporation of petroleum asphalt can greatly change the original matrix asphalt component proportion,form new asphalt colloid system and composition.High-temperature durability have been greatly improved,especially the most prominent Sichuan natural rock asphalt.
Asphaltene
Component (thermodynamics)
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Warm Mix Asphalt is a new kind of material which is a environment friendly one and used to save energy too.It has the same performance as the Hot Mix Asphalt and even better than it.It can be mixed and rolled at a lower temperature than the HMA.So this technology can reduce the cost of energy and decrease the emissions and fumes.This paper makes a study on the technology of reducing the asphalt viscosity based on the Sasobit-modified asphalt for Warm Mix Asphalt for its application in the actual projects,and also makes a study on the normal performance and the rheology of the Sasobit-modified asphalt.
Asphalt pavement
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This paper studied the aging effect of Short Term Oven Aging method and Long Term Oven Aging method on asphalt mixes.Penetration,Brookfield Viscosity and DSR Frequency Sweeping tests were used to evaluate the aging of the different aged asphalt reclaimed from the STOA and LTOA mixes.Compared with the results from original asphalt,RTFO asphalt and PAV asphalt,it is pointed that the aging of the asphalt reclaimed from the LTOA mixes and the asphalt after PAV aging are normally close,however,the aging of the asphalt reclaimed from the STOA mixes is a little more serious than the asphalt after RTFO aging.The results indicate that the consideration of aging during the asphalt mixture performance evaluations is necessary.
Asphalt pavement
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This research investigates the oxidative aging levels of polymer-modified asphalt (PMA) mixes using gel permeable chromatography (GPC), which can help to simplify the quantification of asphalt aging. Warm-mix asphalt (WMA) technologies, namely, Aspha-min and Sasobit, were especially adapted to the PMA mixes for the purpose of the aging reduction. A short-term oven aging (STOA) procedure was used under 135 and 154°C for 2 and 4 h, respectively, to simulate the asphalt binders aged during the field operations (i.e., production, hauling, and paving construction). The aging levels were analyzed based on large molecular size (LMS) of the binders extracted from the mixes. A rolling thin-film oven (RTFO) method was also utilized using PMA binders containing those WMA additives under 135 and 163°C for 85 minutes for comparison purposes. The results showed that (1) aging time and temperature were important parameters to influence the aging; (2) the STOA procedure had a higher aging level than the RTFO method, which could be influenced by thin film thickness on aggregates; (3) the use of WMA technologies was effective to reduce the aging level of PMA mixes; and (4) it was possible to quantify the oxidative aging of PMA mixes [both hot-mix asphalt (HMA) and WMA] using the GPC technique.
Asphalt pavement
Accelerated aging
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In this paper, the basic idea is about the recycled technology of asphalt mixture, more in-depth study of the lowtemperature performance of warm mix asphalt(WMA).First of all, Including the evaluation of low temperature performance of WMA made of reclaimed asphalt pavement (RAP) (passed and not passed 2.36mm screen), and the influence of WMA with RAP mixed of different dosage of dispersant. Then, using the SBS modified asphalt and base asphalt were test at low temperature, research on the influence of different type of asphalt to the low temperature performance of WMA.
Asphalt pavement
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Warm mix asphalt (WMA) is the latest high impact innovation in the asphalt industry. Surprisingly, WMA is not a new mix or materials system. At the most basic level, it is a means of producing an asphalt mix without heating the aggregate to the normal hot mix asphalt (HMA) levels. This article provides an overview of WMA technology, which allows mixing and placement at temperatures significantly lower than those used for HMA. Using one of the WMA processes, asphalt mixes can be produced as much as 100 deg F lower than by conventional HMA means.
Asphalt pavement
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Understanding the fundamental behavior of Reclaimed Asphalt Pavement (RAP) is a critical prerequisite to a rational design method for mixtures containing very high RAP contents (50% or more). The need for fundamental understanding is heightened when very high RAP contents are used in conjunction with Warm Mix Asphalt (WMA). A mix design method that couples WMA and RAP is needed, and this paper is advancement toward the goal. Results of testing 150 compacted samples strongly supported a partially reusable viewpoint of RAP bitumen. Test results also indicated between 67 to 87% of the total RAP bitumen was reusable and that more viscous materials had lesser amounts of reusable bitumen. The paper also presents component diagrams of high RAP mixtures. The component diagrams account for the bitumen in RAP as it behaves, which consists of three phases. The work presented in this paper shows that very high RAP WMA is feasible, though multiple advancements are needed prior to widespread use.
Asphalt pavement
Component (thermodynamics)
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This paper describes the development of criteria for contracts stipulating performance characteristics on the asphalt mixtures or on the built-in asphalt layers. Also provided is an account of the experience so far as of how the different laboratory methods may give a rightful forecast of the performance of the asphalt materials in the road.
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