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References ASTM 2001 : Standard Test Method for Determination of Rock Hardness by Rebound Hammer Method . – ASTM Stand. , 04 .09, D 5873 – 00

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247 266 Pearson, R.G. 1985: Absolute electronegativity and absolute hardness of Lewis acids and bases. - Journal of American Chemical Society, 107, pp. 6801

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hardness of the surface, but in the case of small specimens, the results of Schmidt hammer measuring are not appropriated. Barton ( 1976 ) recommended the application of uniaxial compressive strength (UCS) of intact rock as JCS in the event of a fresh joint

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affected by the relative abundance of the phenocrysts in andesitic rocks ( Ündül 2016 ). The mineral composition of the rocks also has a great influence on aggregate durability ( Pang et al. 2010 ); the average crystal size and the Mohs hardness correlate

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