IS:5161959 63 Test Specimens- The length of the broken portions of the beams selected for the compression test shall be at least S ern greater than the depth of the beam and the broken portions shall be free from cracks, chipped surfaces or other obvious defects within the length to be tested...

Compressive strength of concrete depends on many factors such as water-cement ratio, cement strength, quality of concrete material, quality control during production of concrete etc Test for compressive strength is carried out either on cube or cylinder...

Cylindrical specimens are tested in accordance with ASTM C 39, Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens strength specimens made from the same concrete sample and tested at the same age In most cases strength requirements for concrete are at an age of 28 days...

11 These test methods provide various testing procedures commonly used for evaluating characteristics of concrete masonry units and related concrete units Methods are provided for sampling, measurement of dimensions, compressive strength, absorption, unit weight (density), moisture content, flexural load, and ballast weight...

Similarly, test the remaining 7 blocks and the average of 8 blocks strength is the final compressive strength of concrete masonry unit Below table represents the value of minimum average compressive strength of individual units...

OF MOLDED CONCRETE CYLINDERS A SCOPE This test method covers the procedure for compression tests of molded concrete cylinders It is a modification of ASTM C 39/C 39M and AASHTO T 22 B REFERENCES AASHTO T 22 - Compressive Strength of Cylindrical Concrete Specimens ASTM C 39/C 39M - Compressive Strength of Cylindrical Concrete Specimens ASTM E 4 - Force Verification of Testing ,...

Masonry (ref 8), and the 28-day compressive strength of the grout must equal or exceed f' m but not be less than 2,000 psi (14 MPa) When property specificationsare used, the compressive strength of the grout is determined in accordance with ASTM C1019, Standard Test Method for Sampling and Testing Grout (ref 9)...