BS EN 12697-34:2020 pdf free

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BS EN 12697-34:2020 pdf free.Bituminous mixtures—Test methods.Marshall test.
BS EN 12697-34  The compacted specimens shall be de-moulded, ensuring that they are cooled in air to avoid any danger of deformation and then tested in accordance with 6.1.1 and 6.1.3. After de-moulding, wait at least 4h before further testing begins. All tests shall be completed within 32 h of de-moulding. Specimens shall not be stacked prior to testing. Specimens of rolled asphalt may be left in the moulds and immersed in cold water to facilitate rapid cooling. The cooled specimens should be extruded from their moulds with the minimum of force and using an extractor of suitable design so that they are ejected without distortion or shock. The bulk density of each specimen shall be determined in accordance with EN 12697-6. The height of each specimen shall be measured in accordance with EN 12697-29; or the volume shall be calculated from the bulk density measurement. Immerse the cylindrical specimens on their flat surface in the water bath for at least 40 min and not longer than 60 min. Maintain the temperature of the water in the bath at[60土1)°C.This action shall be undertaken at the start of testing of a batch of specimens not greater than twelve in number. In the event of a delay of more than 3 min between the testing of each specimen, the test head shall be heated in a suitable oven or water-bath maintained at the specified test temperature. The minimum reheating period shall be the lesser of the delay encountered and 30 min when heated in a water bath, or double that when heated in an oven.This bath shall have a perforated false bottom or shelf that can suspend the test specimens at least 25 mm above the bottom of the bath, and allow at least 25 mm depth of water above the specimens. The size of the bath shall allow specimens to be placed face down and not in contact with one another. A device to ensure continuous circulation of water shall also be fitted.BS EN 12697-34 pdf download.

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