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The design of structures on or within a rock mass requires an estimate of the strength of the intact rock blocks within the mass. These blocks of rock can be many orders of magnitude greater in size than laboratory samples typically tested. The properties obtained from these samples must therefore be scaled to equivalent field values. This work investigates current methods for scaling strength and other rock properties and, in lieu of noted limitations, presents a new constitutive model for intact rock that incorporates size effects. A suite of laboratory testing was performed on samples...