In the second stage of compaction, the intermediate stage, a pneumatic roller is used due to the false belief that it treats the hairline cracks caused in the first stage.
The main result of using three types of rollers is the attempt to treat the formation of hairline cracks (check cracks) caused by the vibratory steel roller used in the first stage of compaction, the breakdown stage. In Ontario, Canada, since 1970, the currently conventional compaction method encompasses three stages with one specific roller for each stage. Keywords: AMIR compactor Pavement textures, Skid resistance MacrotextureĪbbreviations: AMIR: Asphalt Multi Integrated Roller LWT: Locked Wheel Tester MTO Ontario Ministry of Transportation TAC: Transportation Association of CanadaĬompaction of asphalt pavements is defined as the process of reducing the air voids in the asphalt mixture and enhancing the interlock between the aggregate particles through rearranging them more closely together in order to create a denser and more effective asphalt mixture. Thus, AMIR finished roads ensure safer roads. The results confirm that the AMIR is capable of providing single stage compaction with better and uniform values of pavement textures, skid resistance and macrotexture. This paper examines and compares the performance of two new field trials compacted with the AMIR and the conventional compaction rollers. In response, an innovative single-roller compaction method with a prototype roller, known as the Asphalt Multi Integrated Roller (AMIR), was tested in Ontario. Further, the conventional method of compaction also affects pavement surface textures by changing the arrangement of the aggregate particles during compaction the asphalt. Although, this compaction method satisfies the road authority’s requirement of densification, the design objectives of asphalt pavements are rarely met because the pavements deteriorate earlier than the expected design service life. In practice for decades, the conventional method of compaction of asphalt pavements adopted by the Canadian road agencies encompasses three stages with one specific roller for each stage. A good compaction provides mechanical stability and resistance to deformation, while reducing the permeability of the mixture and prolonging durability. The compaction of asphalt pavements reduces the air voids in the asphalt mixture and repositioning the aggregate particles more closely together in order to create a denser and more effective asphalt mixture. The asphalt compaction process is one of the most important factors affecting long term performance of asphalt pavements.
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