BS/EN 13880-13-2018 pdf download.Hot applied joint sealants Part 13: Test method for the determination of the discontinuous extension (adherence test).
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 13880-6, Hot applied joint sealants — Part 6: Method for the preparation of samples for testing
EN 13880-12. Hot applied joint sealants — Part 12: Test method for the manufacture of concrete test blocks for bond testing (recipe methods)
EN 14188-1:2004, joint fillers and sealants — Part 1: Specifications for hot applied sealants
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 14188-1 and the following apply.
ISO and IEC maintain terminological databases for use In standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.pr/obp
3.1
adhesion failures
surface area of the concrete test blocks from which the sealant is completely separated Is to be evaluated for adhesive failure, calculated to the nearest 10 mm2
3.2
cohesion failures
sum of the superficial areas of any ruptures on the faces of the material to the nearest 5 mm2 and any cavity exceeding 3 mm in depth, measured normal to the face of the test specimen
4 Principle
The purpose of this test is to establish whether sealants will remain cohesive and bond to concrete when subjected to discontinuous accelerated extension steps in accordance with EN 14188-1.
The tensile test rig consists of:
— an apparatus which allows the test specimen to be inserted into clamps, conveniently and without disturbing the specimen before, during or after removal. The test specimen shall be fastened in the clamps so that any separate movement is avoided.
If the apparatus is capable of testing a number of test specimens simultaneously, it shall not be significantly affected by the premature failure of one or more test specimens;
— an appliance equipped with an electric motor capable of extending the test specimen in the tensile apparatus every (360 ± 20) s (0,10 ± 0,0 1) mm at a rate of (12 ± 0,5) mm/mm. The accuracy of the test rig shall be class 2A according to ISO 5893.
5.2 Cooling chamber
The cooling chamber is suitable for conditioning the test specimens at a temperature of(—20 ± 1) °C or a temperature of(—25 ± 1) °C in accordance with EN 14188-1.
5.3 Depth gauge
A device to measure depth of defects to the nearest 1 mm.
6 Preparation and conditioning of test specimens
6.1 Prepare the test sample according to EN 13880-6.
6.2 Concrete test blocks in accordance with EN 13880-12 shall be used. The dimensions of the test blocks are (250 ± 40) mm length, (60 ± 20) mm width and (30,0 ± 0,5) mm height. The concrete test blocks shall have a moisture content within the limits of (5,0 ± 0,5) %. The concrete surfaces shall be clean and free of dust.
6.3 Use a suitable mould to place two test blocks exactly opposite each other for a joint width of (15,0 ± 0,5) mm and joint length of (200,0 ± 0,5) mm.
6.4 If a primer is used, apply it to the sawn test faces of the test blocks in accordance with the manufacturer’s instructions.
6.5 Place a top-mask on the mould so that the joint can be overtlled when the test sample in poured into it.
6.6 Any adhering to the borders of the joint of the test sample shall be avoided.
7 Storage of test specimens
7.1 Air conditioned test specimens
The test specimens shall be stored at room temperature for 24 h to 72 h.
7.2 Water immersed test specimens
Store the immersed test specimens completely covered by deionized water at room temperature for 14 d in a suitable container. Afterwards the test specimens shall be dried at a room temperature for 3 h to5h.
8 Procedure
Fix the test specimens in the clamps of the extension apparatus, positioned in the cooling chamber and cool them for at least 6 h at (—10 ± 1) °C or (—20 ± 1) °C or (—25 ± 1) °C. The temperature to be chosen depends on the sealant which is tested. Test temperatures for the different sealants are defined in EN 14188-1:2004, Table 2.
Extend the joint in steps of (0.10 ± 0.01) mm at an extension rate of (12 ± 0,5) mm/mm, every (360 ± 20) s up to the total extension of 5 mm. Record the maximum force during this discontinuous extension.
After reaching the total extension, hold the position of the test specimen. Record the stress IN/mm2] after 1 h ± 1 mm. This shall be recorded as the stress after one hour, stress (1 h).
If the result final force is required, continue to record the loss of force at intervals of 30 mm until a value is reached after which any further decrease will be less than 5 %. This shall be recorded as the final force.
The temperature of the air around the specimens, the force and the extension shall be registered during the entire test procedure. The extension can be measured outside the chamber as long as the accuracy requirement is fulfilled for the sealant specimen. The force shall be measured outside the chamber.
After the discontinuous extension test, all sides of the joint shall be examined for adhesive and cohesive failures In accordance with EN 14188-1. Measure the depth of defects to the nearest 1 mm.
9 Calculation and expression of results
9.1 Stresses
The maximum stress shall be calculated to the nearest 0,01 N/mm² by dividing the maximum force (N) by the joint area (usually 200 mm x 30 mm = 6 000 mm²).BS/EN 13880-13-2018 pdf download.