Abstract

The abrasive properties of stone that wear away and destroy the cutting blades and drill heads of boring machines increase the cost of construction and mining projects. This study investigated the effects of petrographic characteristics on the abrasiveness of granitic building stone. The composition and abundance of minerals forming each sample were evaluated by preparing microscopic sections of 18 samples, which were then classified as granite, gabbro or hornfels, that are introduced in the building industry as granite building stone. The effect of the abundance of specific minerals was evaluated by calculating the equivalent quartz content for each sample. Cerchar and Laboratoire Central des Ponts et Chausées (LCPC) testing determined the Cerchar abrasivity index (CAI), LCPC abrasivity coefficient (LAC) and LCPC breakability coefficient (LBC) for samples. Linear and direct relationships having a correlation coefficient of greater than 0.82 were determined for LAC–EQC (equivalent quartz content), CAI–EQC and CAI–LAC. No relationship was found having an acceptable value for R for LBC–EQC in the whole samples; however, grouping them produced an experimental relationship at R > 0.88 for LBC–EQC. It was concluded that the experimental relationships for LAC–EQC, CAI–LAC and LBC–EQC increased for groups having the same mineralogical composition. Comparison of the relations in the present study with those proposed by other researchers shows a similar trend of change in the parameters.

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