Moisture Susceptibility and Rutting Test of Reclaimed Asphalt Pavement on Molasses Modified Hot Mix Asphalt

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Date

2022-01

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Addis Ababa University

Abstract

n Ethiopia, every year, various projects on road repair, upgrading, new road construction, and routine maintenance projects are undertaken, all of which rely on the usage of natural and industrial resources. Reclaimed asphalt pavement material (RAP), the usage of RAP in Ethiopia is very limited , due to lack of clear standard and recommendations on how to use asphalt pavement wastes. Reclaimed asphalt pavement has advantages in terms of environmental benefits, cost savings, land fill, and, but it also has drawbacks such as ductility loss and harsh mixtures when it is optimized. This research studies the effect of RAP on HMA with binder treated with molasses. The marshal mix method was used to create hot mix asphalt in the labratory. The volumetric test, stability, flow, moisture susceptibility, and rutting tests were performed on four different Reclaimed asphalt pavement contents (10, 20, 30, and 40%) HMA with a 3% molasses modified binder. Based on this study, when compared to the control mix, all of the modified mixes performed better in the tests undertaken for this study. When compared to other RAP and molasses-modified mixes, the RAP and molasses-modified mixes had better moisture resistance and lower rut depth. The RAP and molasses modified mixes performed better in terms of stability, flow, and volumetric qualities when compared to the other mixes, however because the RAP percentages utilized were 10%, 20%, 30%, and 40%, these attributes improved on the higher RAP (30 & 40) percentages this may be due to the softening effect of molasses. Mixes with RAP and molasses showed better resistance for moisture and lower rut depth, but more studies should be conducted for different molasses and RAP contents with more performances tests to have more reliable data

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Keywords

Hot Mix Asphalt, Asphalt Pavement, Rutting Test

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