Effect assessment the impact of filler types on the input design parameter of flexible pavements

Abstract EN

To meet the requirements of flexible pavements (safety, economy, limited the stresses on the natural subgrade and a smooth ride), good quality material of surface course must be used so to prevent pavement distresses caused by the different types of loadings (structural and environmental loadings), while the resilient modulus is important input data when flexible pavement was designed, it is selected to show its effect by different types of mineral filler as a partial replacement.

In this paving mix, to improve the quality of the mix material and to represent the effect of these replacements materials on the elastic characterization by measuring the resilient modulus of hot mix asphalt (HMA): Fly Ash (FA), Ordinary Portland Cement (OPC), Hydrated Lime (HL) and Silica Fume (SF) are used as a partial percent of filler (Limestone Dust) (LSD) replacement, where these materials are locally available including (40-50) penetration grade asphalt binder.

To achieve the goal of study; asphalt concrete mixes are prepared at their optimum asphalt content using Marshall Method of mix design.

Four replacement percent’s were used; 0, 1.5, 3.0 and 4.5 percent by total weight of aggregate for each filler types.

According to ASTM D4123 criteria (Resilient Modulus) was tested by UTM¬25.

Mixes modified with (FA), (OPC), (HL) and (SF) were found to have average improvement in the value of Resilient Modulus by (13.37, 9.63, 11.14, 24.00) % at 1.5 percent of filler replacement and by (24.54, 16.63, 18.73, 38.31) % at 3.0 percent of filler replacement also the percent of improvement is: (39.55, 26.36, 29.82, 58.30) at 4.5percent of filler replacement sequentially.