Concrete compression testing machines designed and built by cantrol are used to determine compression, split and flexural strength. they meet the ,aashto t 22 , bs 1610 , bs 1881 , astm e4 , astm c109/109m , astm c293/293m , astm c39/39m , astm c78/78m. the frame meets or exceeds aci 363 recommendations for stiffness. usually applied to materials of high compression but low tensile strength in which the specimen is subjected to increasing compression force until failure occurs. there are two major types of frame, welded frames and four-column frames. and two types of hydraulic power packs and digital controllers, semi-automatic and automatic