[Asphalt Material Characterization, Accelerated Testing, and by Lubinda F. Walubita

By Lubinda F. Walubita

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Extra resources for [Asphalt Material Characterization, Accelerated Testing, and Highway Management] (By: Lubinda F. Walubita) [published: January, 2010]

Sample text

So, the accumulative strain at 1,000 repetitions makes less sense. In the test, AR-PAC shows a bigger resilient modulus. This is not contradictory with the relatively weaker performance from the wheel tracking test and triaxial compression test, because the loading scale is relatively minor in this test. Porous asphalt with rubber bitumen shows higher stiffness at a lower loading scale here. The low flow number at such a light loading level shows that the open-graded PAC mixture has limited strength in resisting cyclic loading.

R. R. com ABSTRACT: In the past few years, asphalt emulsion Cold In-Place Recycling (CIR) has been used successfully with asphalt emulsions in asphalt concrete pavement rehabilitation in China. However, there are currently no existing performance specifications using the Superave Gyratory Compactor (SGC) in China for the development and verification of asphaltic CIR mix designs. The objective of this study was to develop performance based specifications through laboratory testing and field verification of three CIR projects.

In order to simplify the research, the PD property at two pavement temperatures was simulated by the APA test under four test modes which are listed in the text below: ƒ Test mode 1: The first PD was tested for 4000 loading cycles at 30ć at the first stage, then the test was stopped and the temperature was raised to 40ć and maintained at 40ć for 6 hours. The second PD was tested for 4000 loading cycles at 40ć in the second stage. ƒ Test mode 2: 5000 loading cycles at 40ć at the first stage and 5000 lb cycles at 50ć in the second stage, were used.

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