Abstract
Using the fibre additives with a uniform distribution in asphaltic concrete mixture is a well-known technique for improving the mechanical properties and durability of asphalt pavement. The purpose of this study is to investigate the effect of preparing fibre and production of the properties of bitumen and asphalt concrete mixture. In this study, a dense-graded aggregation, mineral fibres (asbestos) and synthetic fibres (polyester and nylon) were used. Laboratory studies were done by comparing different rheological properties, mechanical and moisture susceptibility of mixtures of fibres. Results of the penetration and softening point on mixtures of bitumen – fibre show that fibres improve the mixed rheological properties and stiffening effect of fibre properties. The results of Marshall Tests indicate that adding fibres reduces the strength in Marshall and results in the slight increase in the percentage of optimum bitumen content and asphalt percentage of air voids in comparison with typical fibre. The results of the indirect tensile tests showed that the addition of fibres, depending on the percentage of fibres significantly improves the durability of the mixture.
Highlights
Durability of asphalt mixtures means the resistance against the effects of traffic and weather conditions
The experimental results on mixtures of bitumen - fibres showed that adding fibre to bitumen increases the Softening point of bitumen – fibre mixture in other words the bitumen – fibre mixture is harder than the original bitumen
This study evaluates the performance of asphalt mixtures made with asbestos fibres, nylon and polyester and tries to improve properties of asphalt mixture and bitumen and provide pavement with better and more
Summary
Durability of asphalt mixtures means the resistance against the effects of traffic and weather conditions. The addition of fibres to the asphalt concrete mixture improves the bitumen characteristics and reduces bitumen drainage that reduces the bitumen content and increases the slippery resistance. Stuart and Malm Quest [2] used polymer additives, cellulose fibres and wool in aggregates asphalt mixtures (mastic asphalt) to reduce the drainage properties of bitumen. Results of wheel rutting on asphalt mixtures containing cellulosic fibres and polymer. Brown et al [3] in order to prevent drainage of bitumen in asphalt mixtures Skeleton aggregates used polymer Styrene-Butadiene-Styrene (SBS), polyethylene, cellulose fibres and rock wool. The experimental results showed that with increasing fibre percentage, the indirect tensile strength of dry asphalt mixtures, slightly reduced but the in a wet situation indirect tensile strength increases. Tensile strength of asphalt mixtures containing fibres was slightly greater than the control sample
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