Earlier this year, the Bureau of Reclamation’s Materials Engineering & Research Laboratory used left over concrete from a current research project to cast a 36-inch diameter, by 72-inch-tall concrete cylinder. The cylinder weighed more than 6300 pounds and contained 1.5 cubic yards of concrete. Katie Bartojay, P.E., civil engineer, senior technical specialist, gave the cylinder some comfort right before it was crushed in compression by one of the world’s largest testing machines. This machine was made in 1948 and is used by USBR to test concrete with very large aggregate for dam construction projects. Visit go.hw.net/BreakingCylinder to watch as the cylinder breaks with a mighty boom at 4.38 million pounds with a stress around 4300 psi.