Patent ID: 7784357

Claim:
A creep tester for measuring a creep characteristic of a construction material, comprising: a movable actuator for applying a constant load to a specimen made from the construction material corresponding to changes in length of the specimen; a cam actuator operatively coupled with the movable actuator for applying the load to the latter, wherein the cam actuator includes a cam rotatably mounted on a securing shaft, and has a substantially semi-cylindrical column; and a self-weight actuator fixedly coupled with the cam actuator for delivering the load to actuate the cam actuator, wherein the movable actuator includes upper and lower spherical adjustment seats configured to hold upper and lower portions of the specimen, a spring disposed on the upper spherical adjustment seat configured to react corresponding to a minute deformation of the specimen, upper and lower movable tables respectively contacting the spring and the lower spherical adjustment seat, and configured to be moved along four tensile load columns in a vertical direction while being secured to the four tensile load columns in a horizontal direction, a load cell and a stationary table disposed on the upper movable table, and a movable loading table disposed under the lower movable table configured to apply a predetermined load to the specimen.