Abstract
The aggregate shape properties produced from the different crushing techniques influence the performance properties of the asphalt mixtures. The objective of this study was to classify the aggregates into spherical, flat, elongated and flat, and elongated shapes, collected from impact crusher and jaw crusher of two sources, and to calculate the shape parameters, such as aspect ratio, shape factor, form factor, sphericity, roundness, and angularity index. In addition, this study also investigated the effects of this classification on the Marshall stability and volumetric properties of asphalt mixtures prepared from the respective shape of aggregates. The results showed that the aggregate of different fractions (passing 37.5 mm and retained on 4.75 mm) produced from the jaw crusher of Margalla quarry showed better shape parameters. The spherical aggregates collected from all crushers showed 20–30% higher Marshall stability of the blends by improving the mechanical and volumetric properties of the asphalt mixtures.
Highlights
The pavement structures are designed and constructed to sustain the loading and provide adequate serviceability
The results showed a significant effect of morphological characteristics on the resilient modulus of the asphalt mixture
The shape properties of the aggregates of different fractions are calculated from the digital image processing approach to compare the shape parameters
Summary
The pavement structures are designed and constructed to sustain the loading and provide adequate serviceability. The researchers focus on the different properties of asphalt and its modification to enhance the service life. The performance of the asphalt mixtures is focusing on the morphological properties of the aggregates. The quantification of aggregate shape parameters is quite important to achieve optimum performance by utilizing digital image processing techniques. The shape parameters control the flatness and elongation particles in the gradation of coarse aggregates. The particle index and angularity are essential indicators for the packing of aggregates [1]. The shape parameters indicate the fatigue behavior of the asphalt mixtures. The effect is increased as the thickness of the pavement structure is increased
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