Evaluation of compressive strength and stress-strain behavior of materials for base layer containing reclaimed asphalt pavement

Document Type : Original Article

Authors

1 Ph.D., Student, Faculty of Civil, Water and Environmental Engineering, Shahid Beheshti University (SBU), Tehran, Iran.

2 Associate Professor, Faculty of Civil, Water and Environmental Engineering, Shahid Beheshti University (SBU), Tehran, Iran.

3 Associate Professor, Road, Housing and Urban Development Research Center, Tehran, Iran.

Abstract

It is possible to use reclaimed asphalt pavement materials as a type of recycled material in the asphalt concrete layer or the base layer in the pavement. However, due to the variety of sources as well as insufficient strength, RAP materials without stabilizing additive is not suitable in granular base layers. In this paper, the unconfined compressive strength of cement treated RAP base has been investigated and evaluated in a laboratory study. Three cement contents of 4, 5, and 6 percent were added and the samples were cured for 3, 7, 28, and 90 days after compaction. Samples were prepared with standard compaction energy according to ASTM D558. The unconfined compressive test has been carried out using the strain control method. In order to investigate the effect of moisture, in addition to the optimum moisture, moisture levels below and above the optimum have also been evaluated. Based on the results of this laboratory study, with the increase of cement percentage and curing period, unconfined compressive strength and modulus of elasticity increase visibly. It was also found that according to the percentage of cement used in the mixing design, the maximum strength may occur at the optimum moisture or less than the optimum moisture content

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Journal of Transportation Research
Volume 20, Issue 2
April 2023
Pages 129-146

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