The correlations between the Cerchar abrasivity index and the geomechanical properties of building stones
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ORIGINAL PAPER
The correlations between the Cerchar abrasivity index and the geomechanical properties of building stones Mehmet Volkan Ozdogan 1 & Ahmet Hamdi Deliormanli 1 & Hayati Yenice 1 Received: 30 May 2018 / Accepted: 1 October 2018 # Saudi Society for Geosciences 2018
Abstract Cerchar abrasion index (CAI) value is one of the most important test parameters for determining the abrasion value of a cutter or drilling bit. This study aims to present the relation between CAI and various geomechanical properties of building stones. Herein, single and multiple regression analyses were performed to determine the best measure of the relation between CAI and three geomechanical properties. The CAI value is strongly related to the Shore hardness. However, the correlation coefficient increases when we jointly consider the Shore hardness, porosity, and uniaxial compression strength of rock. On the contrary, the analyses results show that the significance level of the CAI value is lower when the CAI value is less than 1. The correlation between CAI and Shore hardness is higher when the CAI values greater than 1 are considered. Also, the R2 value increases from 0.843 to 0.946 in multiple regression analysis. Keywords Cerchar abrasivity index . Porosity . Shore hardness . Uniaxial compressive strength . Regression analysis
Introduction Natural stones are commonly used building materials, and the cutting operation is very important in the processing and production of natural stones. The Cerchar abrasivity index (CAI) value is well known as a crucial factor for determining the cutting process performance of natural building stones, particularly the selection of cutting materials. Additionally, to determine rock abrasiveness, the CAI value is commonly used. Abrasion influences the wear life of cutting tools in any rock excavation operation, where small holes are drilled for blasting large-diameter tunnels, which are bored by tunnel boring machines (TBMs). Abrasion and wear are vital parameters for determining the lifetime of
* Mehmet Volkan Ozdogan [email protected] Ahmet Hamdi Deliormanli [email protected] Hayati Yenice [email protected] 1
Department of Mining Engineering, Dokuz Eylul University, Izmir, Turkey
the drilling rods/bits or cutter in mining and industrial applications. Various rock abrasion measures have been introduced over the years to help engineers estimate tool life. As the wear life of rock cutting tools often has a linear relation with the degree of rock abrasion, any variation in these measurements will have a direct and proportional impact on the estimated tool life, operational duration, and related costs (Rostami et al. 2014). The factors affecting rock abrasivity are as follows: mineral composition, grain shape and size, hardness of rock minerals, type of matrix material, and the physical and mechanical properties of rocks, such as strength, hardness, and toughness (Singh and Ghose 2016). CAI is one of the easiest, most convenient, and most reliable tests for determining
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