Enhancement of the asphalt mixture using sawdust coal as filler.

Early failures have been observed on some of Iraq's newly constructed highway pavements, posing a risk to both traffic safety and the economy. Permanent deformation (rutting) and cracking are two common types of these failures. The major goal of this research was to study the sawdust coal behavior as a filler material in hot mix asphalt. To prepare asphalt briquettes, conventional Ordinary Portland cement (OPC) was replaced by weight with sawdust coal (SDC) as a filler. At different percentages were used: 0%, 20%, 40%, 60%, 80%, and 100%. Marshall Stability, indirect tensile strength, and moisture sensitivity tests were performed on the samples. The stability, flow, voids filled with asphalt, voids in mineral aggregate, and air voids of the mixture were all evaluated. At 60% acceptable sawdust coal percentage, the results were be 12.08 KN, 2.75 mm, 72.3 %, 15.2 %, and 4.2 %, respectively. In addition, improve tensile performance. A mixture of 60% sawdust coal produced a desired mix with higher stability, less deform, more tensile strength than mix with cement filler. Despite the decrease in the TSR% than reference mixture still met the criteria which are minimum of 80%. The incorporation of sawdust coal in the asphaltic concrete improve its characteristics, according to the above results. [ABSTRACT FROM AUTHOR]