Abstract
Reclaimed Asphalt Pavement (RAP) is old asphalt pavement that has been removed from a road by milling or full depth removal. The use of RAP in hot mix asphalt (HMA) eliminates the need to dispose old asphalt pavements and conserves asphalt binders and aggregates, resulting in significant cost savings and benefits to society. This paper presents a study on HMA with different RAP proportions carried out to evaluate the volumetric properties and performance of asphalt mixes containing different proportions of RAP. Marshall Mix Design Method was used to produce control mix (0% RAP) and asphalt mixes containing 15% RAP, 25% RAP and 35% RAP in accordance with Specifications for Road Works of Public Works Department, Malaysia for AC14 dense graded asphalt gradation. Volumetric analysis was performed to ensure that the result is compliance with specification requirements. The resilient modulus test was performed to measure the stiffness of the mixes while the Modified Lottman test was conducted to evaluate the moisture susceptibility of these mixes. The Hamburg wheel tracking test was used to evaluate the rutting performance of these mixes. The results obtained showed that there were no substantial difference in Marshall Properties, moisture susceptibility, resilient modulus and rutting resistance between asphalt mixes with RAP and the control mix. The test results indicated that recycled mixes performed as good as the performance of conventional HMA in terms of moisture susceptibility and resilient modulus. It is recommended that further research be carried out for asphalt mixes containing more than 35% RAP material.
Highlights
A pavement which deteriorates gives poor riding quality, reduce vehicle traction due to lack of surface friction and increase vehicle users’ maintenance costs
The results of the moisture susceptibility test, resilient modulus and rutting test as performance tests were compared between the control mix and reclaimed asphalt material (RAP)-Asphalt mixes
The basic properties tests that were conducted for both virgin and RAP aggregates consist of Los Angeles abrasion test, aggregate impact test and specific gravity
Summary
A pavement which deteriorates gives poor riding quality, reduce vehicle traction due to lack of surface friction and increase vehicle users’ maintenance costs. Maintenance is required to maintain the pavement at a certain desirable condition. There are several advantages in reusing RAP as pavement materials in terms of environmental, economic and engineering perspectives. The primary environmental advantages include conservation of resources and saving landfill space. It is economical as the material cost is reduced when RAP is used in HMA [2][3]
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