DETERMINATION OF CHARACTERISTICS OF CONCRETE SPECIMENS BASED ON EXPANDING CEMENT

摘要

FIELD: instrumentation.SUBSTANCE: claimed process comprises the production of a concrete specimen, placing it into a formwork and measurement of the concrete specimen volume expansion by means of a driven rod limiting the specimen initial sizes. The said drive rod is provided with a strain gauge and concrete expansion take-up plate on props. The force at the driven rod caused by the concrete expansion is defined by the following formula: F=λ(48·E·I)/l; (kN); where l is the length of the metal plate between two props whereat it is secured (cm); I is the moment of inertia of the metal plate cross-section (cm); E is the coefficient of elasticity of the plate material; λ is the plate flexure equal to the expansion of concrete (cm). Then the strain energy is defined by formula:, where: Sis the concrete area in the plane located across the direction of the analysed strains (cm).EFFECT: higher reliability and accuracy of determination of the concrete specimen strain energy.1 dwg