Discussing the feasibility of improving fatigue performance of asphalt mixtures by incorporating high recycled asphalt pavement

The environmental considerations need to be taken into account in any road resurfacing and upgrading project, for example, by reusing asphalt rubble for production of new pavement courses. Mixtures containing larger amounts of recycled asphalt pavement are improved by adding rejuvenator additives. The tests performed on the recycled asphalt mixtures containing lard imidazoline confirm the suitability of this agent for paving applications. Lard imidazoline was found to improve the stiffness modulus, fatigue performance and resistance to the action of water and freezing temperatures. The parameters obtained at the optimum content of additive complied with the criteria defined for virgin asphalt concrete and other mixtures of that kind.

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Effects of Recycled Asphalt Pavement Amounts on Low-Temperature Cracking Performance of Asphalt Mixtures Using Acoustic Emissions

Transportation Research Record Journal of the Transportation Research Board ◽

10.3141/2208-09 ◽

2011 ◽

Vol 2208 (1) ◽

pp. 64-71 ◽

Cited By ~ 67

Author(s):

Behzad Behnia ◽

Eshan V. Dave ◽

Sarfraz Ahmed ◽

William G. Buttlar ◽

Henrique Reis

Keyword(s):

Low Temperature ◽

Asphalt Pavement ◽

Acoustic Emissions ◽

Asphalt Mixtures ◽

Recycled Asphalt Pavement ◽

Recycled Asphalt ◽

Cracking Performance ◽

Low Temperature Cracking

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Mechanistic and Volumetric Properties of Asphalt Mixtures with Recycled Asphalt Pavement

Transportation Research Record Journal of the Transportation Research Board ◽

10.1177/0361198105192900104 ◽

2005 ◽

Vol 1929 (1) ◽

pp. 28-36 ◽

Cited By ~ 31

Author(s):

Jo Sias Daniel ◽

Aaron Lachance

Keyword(s):

Dynamic Modulus ◽

Creep Compliance ◽

Asphalt Pavement ◽

Superposition Principle ◽

Asphalt Mixtures ◽

Volumetric Properties ◽

Recycled Asphalt Pavement ◽

Recycled Asphalt ◽

Creep Flow ◽

Tension And Compression

This research examines how the addition of recycled asphalt pavement (RAP) changes the volumetric and mechanistic properties of asphalt mixtures. A Superpave® 19-mm mixture containing 0% RAP was the control for evaluating properties of mixes containing 15%, 25%, and 40% RAP. Two types of RAP were evaluated: a processed RAP and an unprocessed RAP (grindings). Testing included dynamic modulus in tension and compression, creep compliance in compression, and creep flow in compression. Dynamic modulus and creep compliance master curves were constructed with the use of the time–temperature superposition principle to describe the behavior of each mix over a range of temperatures. The voids in mineral aggregate (VMA) and voids filled with asphalt (VFA) of the RAP mixtures increased at the 25% and 40% levels, and there was also an influence of preheating time on the volumetric properties. The dynamic modulus of the processed RAP mixtures increased from the control to 15% RAP level, but the 25% and 40% RAP mixtures had dynamic modulus curves similar to that of the control mixture in both tension and compression. The creep compliance curves showed similar trends. A combination of gradation, asphalt content, and volumetric properties is likely the cause of these trends.

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