IMPROVEMENT OF SUBGRADE LAYERS USING RECLAIMED ASPHALT PAVEMENT (RAP)

Abstract
Soil stabilization is a process of treating a soil in such a manner as to maintain or improve the
performance of the soil as a construction material.The changes in the soil properties are brought
about either by incorporation of additives or by mechanical blending of soil types.
Milled reclaimed asphalt pavement (RAP) has been used in bituminous recycling.RAP is mixed
with fresh bitumen, rejuvenators and new aggragates in suitable proportions.Addition of RAP to
soil indicated a shift of the grain size distribution curve and acted as a mechanical stabilizer.
There has been the need for the construction industry to embrace sustainable construction.The use
of RAP for improvement of soil is a step in that direction as it will reduce the cost of
construction,make use of locally available material and preserve the environment.
Laboratory tests such as CBR,Atterberg Limits, Proctor compaction test and grading analysis
were carried out on RAP and gravel mixture to give an assessment of its performance.It was
determined that with an increase in RAP there was a significant increase in the soil bearing
capacity.The 50% RAP and 50% gravel ensured a better performance and was more realistic.

 

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