Experimental Study of the Failure Mechanism of the ...
The test results showed that the compressive strength of C60, C40, and C20 concrete samples was 67.2, 48.3, and 29.1 MPa, respectively, and thus met the study requirements. 2.4. Preparation of the Drawing Test Specimen. The steel pipe end and the two ends of the cured concrete country rock sample were polished with a grinder.
