Evaluation of the Effects of Fiber and Aggregate Type on Mechanical Characteristics of Stone Mastic Asphalt (SMA) and its Comparison Hot Mix Asphalt (HMA)
Message:
Abstract:
In the early 1960’s, the European asphalt industry recognized a critical need for pavements which would be resistant to rutting, abrasion, and various pavement distresses induced by heavy traffic and studded tires. To address this need, roadway pavement contractors and researchers developed Stone Matrix Asphalt (SMA). After a short time of its application in Germany, this asphalt has been used in Europe for more than 20 years to provide better rutting and permannet deflection resistance and and to resist studded tyre wear. SMA is a gap-graded mix containing a high concentration of coarse aggregate, which maximizes stone-to-stone contact and provides an efficient network for load distribution. The coarse aggregate particles are held together by a rich matrix of mineral filler, fiber, and polymer in a thick asphalt film. The coarse aggregate materials are the main structure of mixture. Fibers as a stabilizer and to prevent draindown used in SMA mixtures. The main objective of this research is the investigation of the effects of cellulose and jute fibers on mechanical in stone matrix asphalt (SMA) made with lime and marble aggregates and its comparison with conventional asphalt mixtures. Also, in the optimal asphalt content, mastic draindown of SMA mixturs and resilient modulus of AC and SMA mixturs were obtained and compared. Test results have shown that optimal asphalt content of bituminous mixturs made with lime aggregates, is slightly more than marble aggregates. Also, optimal asphalt content of bituminous mixturs made with cellulose fibers, is slightly more than jute fibers. Marshal stability and marshal quotient of SMA mixturs made with lime aggregates, is morse than marble aggregates; also marshal stability and marshal quotient of SMA mixturs made with jute fibers, is more than cellulose fibers. Resilient modulus of bituminous mixturs made with marble aggregates, is more than lime aggregates, also resilient modulus of bituminous mixturs made with cellulose fibers is more than jute fibers. Mastic draindown of SMA mixturs made with lime aggregates, is less than marble aggregates; also mastic draindown of SMA mixturs made with jute fibers, is less than cellulose fibers. The dosage rate for cellulose and jute fibers shall be approximately 0.3 percent by total mixture weight of SMA, and is sufficient to prevent draindown which its permissible rate is 0.3 percent by weight of the mix. The VCA ratio for all of the SMA mixturs is less than 1, therefore provides stone-to-stone contact in the mixturs.
Language:
Persian
Published:
Journal of Transportation Research, Volume:12 Issue: 4, 2016
Page:
375
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