The CERCHAR abrasivity test is very popular for determination of rock abrasivity. An accurate estimation of the CERCHAR abrasivity index (CAI) is useful for excavation operation costs. This paper presents a model to calculate CAI based on the gene expression programming (GEP) approach. This model is trained and tested based on a database collected from the experimental results available in the ...

Rock abrasivity, as one of the most important parameters affecting the rock drillability, significantly influences the drilling rate in mines. Therefore, rock abrasivity should be carefully evaluated prior to selecting and employing drilling machines. Since the tests for a rock abrasivity assessment require sophisticated laboratory equipment, empirical models can be used to predict rock a...

The brittleness of rock is known to be an important property that affects the fragmentation characteristics in mechanized cutting. As interaction between cutting tool and (i.e., cutter forces, efficiency, s/p ratio, abrasivity) during mechanical strongly influenced by fragmentation, tools disc pick cutter) experience different behaviors depending on brittleness. In this study, relationships abr...

Rock abrasivity is an essential factor for selecting cutting tools, estimating tool wear and life, and ultimately, matching various mechanized excavation systems with a given geologic condition. It also assists engineers to determine economic limits of different cutting tools and machines used in civil and mining projects. The Cerchar abrasion test is a simple and most widely used method for ro...

Abstract In any underground excavation project, choosing the best technique and careful preliminary assessments of wear costs production rates are crucial aspects to consider. The rate tools, as well frequency tool replacement, deeply affect duration cost‐effectiveness whole project. Among rock‐specific characteristics affecting wear, Cerchar abrasivity index (CAI) uniaxial compressive strength...

OBJECTIVE Toothbrush abrasion is significant in the development of tooth wear, particularly when combined with erosion. This in vitro study aimed to evaluate the impact of toothpaste slurry abrasivity and toothbrush filament stiffness on abrasion of eroded enamel. MATERIAL AND METHODS Eroded enamel samples (hydrochloric acid, pH: 2.6, 15 s) were brushed with 40 strokes in an automatic brushin...