The influences of textural parameters of grains on the LCPC abrasivity of coarse-grained igneous rocks

• LCPC abrasivity coefficient was investigated for coarse-grained igneous rocks.
• The effects of rock textural parameters on the LCPC abrasivity were revealed.
• The textural properties of loosened materials have a strong influence on the tool wear.

Rock abrasivity causes the tool wear in rock excavation or drilling. The understanding of wear mechanism is important for the cost estimation and planning of projects. In this study, the effects of textural properties of grains such as aspect ratio, roundness, and diameter on the LCPC abrasivity coefficient (LAC) were investigated for coarse-grained igneous rocks. First, the LAC was correlated to the abrasive mineral content (AMC) and a good correlation was found between the two parameters. Then, the LAC was correlated to the AMC multiplied by the textural properties of grains, respectively. Compared to the correlation coefficient of the relation between the LAC and the AMC, the correlation coefficient was increased by including the textural properties of grains to the correlation. A combined parameter called shape and size coefficient (SSC) was defined in order to see the combined effect of the textural properties of grains on the LAC. The correlation coefficient of the relation between the LAC and the AMC multiplied by the SSC is very strong and fairly higher than that of the previous correlations derived. It can be concluded that the textural properties of loosened materials have a strong influence on the tool wear.