Abstract
Many researchers’ attention was drawn by the process of improving the characteristics and the performance of hot mix asphalt. In this research, Reed Plant Ash (RPA) and Reed Plant Powder (RPP) were used as a substance to optimize the characteristics of asphalt at (5, 10, 15, and 20) % by asphalt weight. The laboratory work included two parts to get the requirements of the research: the first part is the physical properties for pure and modified asphalt. The second part is the prepared specimen of HMA with pure and the best percent of modified asphalt according to the Marshall criteria using limestone dust at 7% as a filler to the surface layer. The study found that the HMA with modified asphalt by 10% RPP has more effects on its performance by improving the Marshal Stability, volumetric properties, tensile strength ratio, and retained Marshall Stability rather than control mix and HMA with modified asphalt by 15% RPA.
Highlights
INTRODUCTIONThe reed plant was chosen in the purpose of preserving the environment and its sustainability, and it is a material where there is an abundance of it in Iraq, especially near drainage banks and sewage pipes as well as it is an inexpensive material
Optimum asphalt content for the best percent of the modified asphalt with Reed Plant Ash (RPA) and Reed Plant Powder (RPP) according to the stiffness modulus value is shown in Table 9, Table 10 and Fig. 4 indicate the Marshall, volumetric properties, and indirect tensile strength results for the prepared specimens
Adding RPA as a modifying material: penetration before and after aging decreased by 18.75% and 24.32%, respectively, softening point before and after aging increased by 29.27% and 46.51% respectively, ductility before and after aging decreased by 9.02% and 11.11%, respectively, and stiffness modulus increased by 24.00% when the percent of RPA increase to 15% the value of it decrease by 4.72%
Summary
The reed plant was chosen in the purpose of preserving the environment and its sustainability, and it is a material where there is an abundance of it in Iraq, especially near drainage banks and sewage pipes as well as it is an inexpensive material. The replacement of a fine aggregate of asphalt mixture by recycled concrete aggregate and steel slag improves Marshall Stability and decreasing flow Arabani and Azarhoosh, (2012). Do and keun (2008) stated that using recycled waste lime (RWL) as a filler in asphalt concrete mixture improved the resistance to permanent deformation at high temperatures. Many researchers studied how to improve hot mix asphalt concrete properties and performance, the resisting to moisture damage ability and reducing temperature sensitivity by modifying it using additives materials as a partial replacement of mineral filler or using the same materials to modify the asphalt cement with many methods.
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