Abstract
Static and dynamic tests were performed on sixty concrete cylinders to determine the energy absorption capacity of concrete at failure and the effects of load rate on the properties of concrete, and to attempt to determine a method for predicting the dynamic strength of concrete. Twenty 6 in. diameter by 12 in. concrete cylinders were cast from three different strengths of concrete mixes. The nominal strength of the three concretes were 2500, 3700, and 5000 psi. Electric resistance strain gages were embedded in the concrete cylinders cast in standard cardboard molds for purposes of measuring strain. Load was measured by a load cell which supported the specimen in a test frame. Tests were conducted using three different rates of loading. Static tests were made in a 300,000 lb. mechanical testing machine set for 0.05 in./min. movement for three concrete cylinders selected at random from each mix. The load and strain were recorded on a twelve channel oscillograph with the photosensitive recording paper moving at a rate of 0.1 in./sec. slow dynamic tests were made under the same conditions as for the static tests except that the machine was set for a movement of 6.5 in./min. and the photosensitive paper was operated a rate of 10 in./sec. Load was applied in Test 3 by a drop hammer; four specimens were used. Each specimen was subjected to blows from the drop hammer beginning with a one foot drop and increasing the fall in one foot increments until failure occurred. This test was used to determine the amount of energy absorbed by the specimen and was compared to the amount of energy put into the system. Test 4 was a drop hammer test similar to Test 3, but the hammer was raised to a height such that the specimen would fail on one blow. ...
Atchley, Billy Lee (1966). The energy absorption capabilities of plain concrete under dynamic and static loadings. Doctoral dissertation, Texas A&M University. Texas A&M University. Libraries. Available electronically from
https : / /hdl .handle .net /1969 .1 /DISSERTATIONS -177894.