<p>The term Reclaimed Asphalt Pavement (RAP) is used to designate a
material obtained from the removal of pavement materials. RAP is used across
the US in multiple applications, largely on asphalt pavement layers. RAP can be
described as a uniform granular non-plastic material, with a very low
percentage of fines. It is formed by aggregate coated with a thin layer of
asphalt. It is often used mixed with other granular materials. The addition of
RAP to aggregates decreases the maximum dry unit weight of the mixture and
decreases the optimum water content. It also increases the Resilient Modulus of
the blend, but decreases permeability. RAP can be used safely, as it does not
pose any environmental concerns. The most important disadvantage of RAP is that
it displays significant creep. It seems that this is caused by the presence of
the asphaltic layer coating the aggregate. Creep increases with pressure and
with temperature, and decreases with the degree of compaction. Creep can be
mitigated by either blending RAP with aggregate or by stabilization with
chemical compounds. Fly ash and cement have shown to decrease, albeit not
eliminate, the amount of creep. Mechanical stabilizing agents such as
geotextiles may also be used.</p><p><br></p><p><br></p>
| Identifer | oai:union.ndltd.org:purdue.edu/oai:figshare.com:article/14575239 |
| Date | 12 May 2021 |
| Creators | Ayanda Thembeka Ncube (10783554) |
| Source Sets | Purdue University |
| Detected Language | English |
| Type | Text, Thesis |
| Rights | CC BY 4.0 |
| Relation | https://figshare.com/articles/thesis/Use_of_Recycled_Asphalt/14575239 |
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