Investigation of the Effect of Recycled Asphalt Pavement Material on Permeability and Bearing Capacity in the Base Layer

The purpose of this research was to investigate the effects of recycled asphalt pavement (RAP) and cement content on the permeability and bearing capacity characteristics of aggregate base courses. Mixtures containing untreated RAP ranging between 0 and 100 percent and 1, 2, and 3% cement-treated RA...

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Bibliographic Details
Published in:Advances in civil engineering 2018-01, Vol.2018 (2018), p.1-6
Main Authors: Seferoğlu, Ayşegül Güneş, Akpınar, Muhammet Vefa, Seferoğlu, Mehmet Tevfik
Format: Article
Language:English
Subjects:
Aggregates
Asphalt pavements
Bearing capacity
Bituminous cements
California bearing ratio
Cement
Cements
Civil engineering
Laboratories
Laboratory tests
Mechanical properties
Mixtures
Pavement materials
Penetration tests
Permeability
Permeability tests
Recycled materials
Research methodology
Researchers
Roads & highways
Sieve analysis
Studies
Transportation planning
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Summary:The purpose of this research was to investigate the effects of recycled asphalt pavement (RAP) and cement content on the permeability and bearing capacity characteristics of aggregate base courses. Mixtures containing untreated RAP ranging between 0 and 100 percent and 1, 2, and 3% cement-treated RAP were subjected to laboratory tests (bitumen content, sieve analysis, modified proctor, soaked California bearing ratio (CBR), and constant-level permeability tests). The results showed that, as the RAP percentage in the mixture increased, CBR values decreased considerably. Moreover, there is a linear increase in the CBR values with cement treatment. Optimum moisture contents (OMC) and maximum dry densities (MDD) showed a decreasing trend. Increasing the cement percentages in 100% RAP blend increases the OMC and MDD values. The permeability of RAP showed a decrease as the percentage of RAP and cement increased in blends. The study showed that the CBR value of the 20% RAP blend is also obtained in the 100% RAP/3% cement-treated blend. Thus, it has been understood that cement is a suitable material in order to increase the use of RAP. In addition, the increase in the percentage of RAP and cement made the base course more impermeable.
ISSN:1687-8086
1687-8094
DOI:10.1155/2018/2860213