HOW TO MAKE TEST CUBES FROM FRESH CONCRETE?
MAKING OF TEST CUBES FROM FRESH CONCRETE IS-456 has laid down the acceptance criteria of quality concrete. In all the cases, the 28-days compressive strength shall alone be the criterion for acceptance or rejection of the concrete. 7 days compressive strength of concrete can be carried out in order to get a relatively quicker idea regarding the quality of concrete. PROCEDURE OF TEST CUBE PREPARATION EQUIPMENT The following equipments are needed for the preparation of concrete cubes. Sample tray; Mould for making test cube; Spanner; Scoop; Steel float or trowel; Compacting bar; Cleaning rags; A bucket or barrow for transporting the samples; Curing tank Permanent Marker. NO OF CUBES 6 no of Cubes of 150 x 150 x 150 mm size shall be cast, 3 for 7-days testing and 3 for 28-days testing. A sample consists of 3 cube specimens and their average compressive strength represents the test result of that sample. The individual variation of a set of 3 cubes should not