Test the compressive strength of concrete at 20 Mpa and 30 Mpa in a cylindrical shape, diameter 100 mm, height 200 mm, at the age of 28 days by controlling the compression rate at 1 mm/min.
The compressive strength of the test concrete is 20 MPa and 30 MPa, the diameter is 100mm, which is more than 200 mm. After 28 days of test, the compression rate is 1mm/min.