ASTM C469 governs the determination of static Modulus of Elasticity and Poisson’s Ratio of concrete in compression. The ensuing video demonstrates a C469 test on a hydraulically actuated manually controlled Baldwin universal testing machine equipped with an ADMET Gauge Buster 2 Digital Indicator and a computer running ADMET’s Gauge Safe Live Data Exchange program. The digital indicator and computer are connected via a USB port.
ASTM C469 is a compression test whereby a load is applied with a Constant-Rate of-Traverse (CRT) type machine until a specified stress. The modulus of elasticity and Poisson’s ration values will be found within the working stress range (0 to 40% of the ultimate strength). These values are used to determine the size of structural members, the quantity of reinforcements, and to compute the stress for observed strains. The modulus of elasticity under static rate will be less than values found under dynamic or seismic rate and greater than values under slow load application. Before conducting ASTM C469, it is important to read the entire specification in the relevant ASTM publication.