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By J M T Thompson; G W Hunt

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Convert this volume to the equivalent volume in mm3 of the cavities to the nearest 250 mm3. ) (7) Express the volume of cavities in each block as a percentage of the gross volume of the block. (8) Record, to the nearest 5%, the greatest volume of cavity detected. 2 Determination of concrete volume (1) Remove all random flashings with carborundum stone. (2) Measure to the nearest 1 mm using callipers and rule the dimensions of formed indentations and protrusions on the external faces and ends of the block.

These shall not be fixed to the permanent platens, but shall be brought to bear in intimate contact, care being taken to exclude dirt from the interfaces.  The auxiliary platen that will bear on the upper surface of the specimen shall be attached loosely to the testing machine by flexible wire or chain, to prevent it falling if the specimen collapses suddenly underload. 05 mm. 10 mm. 12.  In no case, however, shall the auxiliary platen overhang the permanent platen by more than 75 mm.  The strength indicated in this test varies from that achieved using board capping (see page 15) and the simplified test procedure is generally only used by manufacturers as a rapid control test.

In no case, however, shall the auxiliary platen overhang the permanent platen by more than 75 mm.  The strength indicated in this test varies from that achieved using board capping (see page 15) and the simplified test procedure is generally only used by manufacturers as a rapid control test.  In general, the source of manufacture of the capping board will not affect the indicated block strength. 05 N/mm2. 2.  It must be remembered that because of the high variability of most concrete blocks a large number of specimens need to be tested to predict confidently the ratio between two forms of test.

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