1. The effect of waste paper fiber on the volumetric and mechanical properties of open graded friction course mixtures.
- Author
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Ghanimi, Nashwan AL, Al-Busaltan, Shakir, and Kadhim, Mustafa Amoori
- Subjects
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WASTE paper , *SKID resistance , *ASPHALT modifiers , *MIXTURES , *ASPHALT , *FRICTION - Abstract
Open graded friction course (OGFC) mixtures are generally utilised as an overlay layer on existing pavement layers at thicknesses of up to 50 mm. They are designed with open aggregate skeletons to mitigate noise impact, reduce spray and splash, and minimise night glare. They have also gained widespread popularity worldwide as a result of features such as slip resistance, water permeability, and urban heat reduction. However, despite these advantages, their design structure is somewhat weak due to the high proportion of large gradient gravel content with a lack of smaller particle gradations. In addition to creating air voids of up to 22%, these can cause bitumen and filler to drain down, which is considered one of the main problems of such mixtures. Several researchers have thus attempted to modify the properties of such mixtures by using additives to strengthen the asphalt bond, with improvement sought by adding polymer materials, fiber, or similar additives as additional soft materials. In this study, waste paper fiber (W-PF) was added after being picked to a small size, as this additive has not been used in previous research, in this area and offers both environmental and economic advantages. This was added to the binder at percentages of 0.3%, 0.5% and 0.7% by weight, and the performance of each mix was checked with respect to volumetric properties (air voids, bulk density, porosity and permeability) and mechanical properties (Cantabro wear loss (CL), skid resistance and indirect tensile strength (ITS)). The results show that incorporating W-PF into the asphalt binder generally improves the mixture's performance. With respect to volumetric scales, it leads to higher values of porosity, air voids, and permeability, with improvements of around 14%, 10%, and 31%, respectively, at 0.7% W-PF by weight of binder. As the paper dose increases, the bulk density decreases, and the mechanical characteristics such as skid resistance and ITS increase, by roughly 38% and 24%, respectively, at 0.7% W-PF. Using W-PF in the right proportions to stabilise neat asphalt for OGFC mixes thus appears promising as a long-term solution to several issues. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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