Erol Tutumluer

TL;DR: In this article, the most widely used aggregate shape analysis techniques were evaluated and the analysis results revealed that some of the available analysis methods are influenced by both angularity and form changes and, consequently, are not suitable to distinguish between these two characteristics.

TL;DR: In this article, a quantifiable index based on image analysis to characterize the angularity of coarse aggregate used in pavement layers is described, which can accurately quantify the influence of aggregate angularity on asphalt concrete, portland cement concrete, and granular mix performance.

TL;DR: In this paper, an image-aided discrete element modeling (DEM) approach was introduced to simulate the coal dust fouled track field settlement performance, and the results from the simulation revealed that fouling could lead to unfavorable track distresses such as “hanging tie”.

TL;DR: In this paper, the effects of different fouling agents on ballast aggregate shear strength were studied at the University of Illinois using a large direct shear (shear box) device, and the strength properties of both clean and fouled ballast samples were determined when three types of fine materials (coal dust, plastic clayey soil, and mineral filler) were added to clean ballast sample under both dry and wet [mostly optimum moisture content (OMC)] conditions.

TL;DR: In this article, the influence of coarse aggregate morphologies on the strength and permanent deformation behavior of unbound aggregate materials was investigated using two shape indices, angularity index (AI) and surface texture index (ST), based on image analysis.