Article Information
Effects of Mineral Filler to Polymer Modified Bitumen Ratio on the Design Properties of Hot Mix Asphalt and its Performance

Keywords: Pavement, Hot Mix Asphalt, PMA, Mineral Filler.

Mehran University Research Journal of Engineering & Technology

Volume 29 ,  Issue 4



Current development in the design of asphalt concrete especially in the upper layers of flexible pavements contains about acceptable proportion of mineral fillers passing 75?m (# 200) sieve, which contributes towards the mix cohesion, resistant to rutting and improves serviceability. Three filler to PMA (Polymer Modified Asphalt) ratios (i.e. 2.4, 3.4. and 4.4%) in Marshall Method of mix design were used in order to determine the optimum filler content at relatively low design asphalt contents (3.83%), for asphalt concrete having PMA and 100% lime stone dust. Designed mix was laid on Southbound Turnol Taxila National Highway Section (N-5), Pakistan as a trial in year 2003. The study reveals that filler to asphalt ratio affects the mix properties to a greater extent and mix laid at site have shown relatively better performance during its service life of initial four critical years. For coarse graded mixes with low asphalt contents, designed especially for heavy loading and high temperatures regions like Pakistan, filler to asphalt ratio less than equal to 1.0 yields better results.