Abstract
Workability is of importance during asphalt construction, which plays a role in increasing stability and other performances. Using different mineral fillers can result in different asphalt workability in the same mix design. While fillers can increase stability, viscosity with regards to asphalt mastic needs to be considered for working in the field. Nowadays, waste natural materials can allow agriculturists to get more income by recycling in many industries. In this study, the objective is to determine the effect of using bagasse and coconut peat as filler on mastic viscosity and the resistance to failure performances. Findings show that the viscosities of asphalt mastic with coconut peat and bagasse fillers are relatively similar to those with limestone filler for all temperatures at 20 percent filler content. Additionally, the stabilities and flows of asphalt mixtures mixed with waste natural fillers were close to those mixed with mineral fillers at equivalent temperatures. In conclusion, the mastic viscosity is vital for determining the workability of asphalt mixture. The waste natural fillers including bagasse and coconut peat give similar mastic viscosity to limestone filler and higher than granite filler, which shows less difference to performance results.
Highlights
Most roads have been built by asphalt, because it can offer better driving efficiency and less maintenance than concrete roads
With the hypothesis that if the asphalt mastic viscosity was taken to determine the optimum temperature for mixing and compaction according to asphalt binder viscosity specification, the asphalt concrete performances would be better
This study can be concluded that the mastic viscosity is vital for determining the workability of asphalt mixture
Summary
Most roads have been built by asphalt, because it can offer better driving efficiency and less maintenance than concrete roads. In a hot mixed asphalt (HMA) construction process, the workability is of importance to be considered before paving. Workability is defined as a function accounting the ease of mixing and compaction of HMA. This definition offers the concept of HMA movement, HMA handling and road compactivity via road equipment. Mixing aggregates with asphalt binder is an important task in the production of asphalt pavement. Many parameters, including the temperatures of processing, the mineralogy of aggregates, the gradation of the aggregates, the size or shape of the aggregates and the type of asphalt binder used, affect the workability of asphalt mixtures [1,2]. The guidelines and standards that support paving engineers in the design and production of materials should be sufficient for a broad range of materials and boundary conditions
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