Comparing the Consensus Properties of Aggregate Sources from KP to Margalla Using Image Analysis

Abstract

Hot Mix Asphalt (HMA) is a composite material composed of coarse aggregate, fine aggregate, filler, binder, and air voids. The macro-level characterization of aggregates for asphalt mixture production in Pakistan has introduced inconsistencies in estimating the actual performance of asphalt mixtures. Pakistan typically sources all aggregates needed for asphalt mixtures from Margalla, but there is a possibility that the quarry may be finished soon. To identify a nearby quarry, aggregate samples are collected from various quarries in Pakistan. The aggregates are examined using Scanning Electron Microscope (SEM), X-ray spectroscopy, and conventional index characteristics. The results showed that Margalla aggregate's coarse-grained configuration is the dominant reason for adequate physical properties compared to other aggregate sources. The Malakand aggregate is found to be comparable to Margalla due to its coarse-grained cum irregular loose-grained structure. Amorphous textures superseded dense, coarse-grained textures in some of the aggregate sources, resulting in increased water absorption. The local Malakand quarry is suggested for use in the construction industry based on macro and micro-level investigations.