BS EN 13880-7:2019 pdf free.Hot applied joint sealants.
4 Principle This method is intended to serve as an accelerated test for the assessment of damage to hot applied sealants resulting from fluctuating temperatures, water-spraying and simultaneous dynamic loads. 5 Apparatus 5.1 Tensile test rig, which allows the test specimens to be inserted into holding clamps, conveniently and without disturbing the test specimens before, during or after removal. The test rig shall be capable of testing one specimen or a number of test specimens simultaneously and shall not be significanth affected by the failure of one or more test specimens The testing rig shall have the following characteristics : be motor driven through positive drives without slip or significant backlash , so that cycles of extension and compression are carried out steadily and automatically , be capable of moving the test specimens smoothly and linearly , so that their alignment is maintained at all times without subjecting them to torsion , bending , shock , or significant vibration ; under the specified conditions in Clause 8 ; be capable of measuring and recording the changes in force ; The accuracy of the test rig shall be class ZA according to IS0 5893 Testing may also be carried out at differing ratios of temperature , deformation and movement in accordance with the sealant manufacturers recommendations provided that the criteria are within the capabilities of the test rig described above specimens to the specified temperature throughout the period of examinatio full complement of test 5.2 Climate chamber , capable of reducing or raising the temperature of a The chamber shall be fitted with a time controlled device to allow the specimen to be subjected to
water spraying for 20 of the total conditioning time at the appropriate temperature as provided for in Clause 7 .Directly after completion of the test cycles raise the temperature to room temperature (23土2) °C for a duration of one hour and perform the following visual inspections: the joint shall be elongated to the maximum specified elongation at (5,5 土0,7) mm/min and inspected to check for visible damage and fractures, such as adhesion or cohesion fractures;
compress the joint to the original dimensions; a 3 mm deep notch in one corner of the joint shall be made with a sharp knife; the joint shall once more be elongated to the maximum elongation and inspected with respect to visible damage and fractures such as adhesion or cohesion failure. The depths of any failures are measured to the nearest 1 mm perpendicular to the joint surface.BS EN 13880-7 pdf download.