Tensile strength properties of coquina - Historic building stone from the First Coast of Florida
Coquina is a historic building stone from the First Coast of Florida which has been used since the mid-1500s for both military and residential construction. Coquina is a limestone consisting of shells cemented with calcium carbonate and quartz sand. Split tension testing was conducted on specimens cored from blocks of coquina. Core samples with diameters of 50.8 mm, 70 mm and 94.6 mm were obtained both perpendicular and parallel to bedding. Seventy-five specimens were tested. Results indicate there is variability between tensile strength of specimens obtained from different blocks. The relationship between tensile strength and unit weight was more variable than expected considering the simple composition of the coquina. Based on the limited testing of specimens cored perpendicular to bedding, coquina is transversely isotropic and there is an decrease in tensile strength with increasing specimen size. Acid bath testing was used to determine the percentage of quartz sand in the specimen in an attempt to relate cementation, expressed as a mass percentage of sand, to tensile strength.
51st US Rock Mechanics / Geomechanics Symposium 2017
Hudyma, Kimes, L., Oglesby, J., & Davies, M. (2017). Tensile Strength Properties of Coquina - Historic Building Stone From the First Coast of Florida.