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    Correlations between Equotip and model C-2 Shore hardness testers for selected natural building stones
    (2011) Güneş Yilmaz N.; Göktan R.M.; Güney A.; Karaca Z.
    Rebound hardness testing of rock materials is widely utilized for rock characterization in the general field of rock mechanics. In this study, an investigation was carried out in order to establish correlations between the model C-2 and the relatively newer Equotip Shore hardness testers. Using both instruments, hardness measurements were conducted on rock materials belonging to three different rock groups which are widely used as building stones. Statistically significant correlations have been found between the rebound hardness values of these two instruments. Valid for the presently tested rock types, it is shown that the established prediction equations can be used as a guide in translating the measured hardness values from one instrument to another. © 2011 ARMA, American Rock Mechanics Association.
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    Relationship between slipperiness and other characteristics of stones used as flooring slabs
    (American Society of Civil Engineers (ASCE), 2016) Bellopede R.; Marini P.; Karaca Z.; Gökçe M.V.
    Slip resistance is an essential parameter when dimension stones are used as inner and outer floorings. Declaration of performances of stones and their surface finishes (sawn, honed, polished, hammered, flamed, sandblasted, or brushed) in relation to conditions (wet or dry) in Conformité Européenne (CE) marking is essential for pedestrian safety. In this study, 130 samples taken from 81 stone types belonging to 13 types of petrographic families were tested according to the EN 14231 Standard, taking different finishes into consideration, during a tenyear period in the Marble Laboratory of Politecnico di Torino (Italy). A high number of pendulum friction tests (1,560) were conducted on 780 samples, and more than 7,000 readings were taken. On the basis of the obtained results, significant relations were found between the tested petrographic families and the types of finishes. A high correlation between open porosity, quartz content, and slipperiness of the stones with honed surface finishes was found. Moreover, the importance of the petrographic characterization of the stone, in relation to the declared surface finish, emerged as each petrographic family responded differently (according to its composition) to the action of the finishing abrasive. © 2016 American Society of Civil Engineers.