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Polymer Institut

Research Institute for Polymeric Construction Materials; BAM accredited Test Laboratory

Digest from :Test report P 518 dated 18.05.94 -Testing of crack bridging with EVERLAST coating system

 

1. Case in Hand
The applicant commissioned the Polymer Institut in their letter dated 16. February 1994 to conduct tests on crack bridging of the EVERLAST coating system..

The test were to relate to

  • Crack Bridging Class II (T+L)

in accordance with the Test Programme for the "Direktives for Protection and Repair of Concrete Construction Components", Section 4; Quality assurence of the construction products, dated November 1992, in accordance with item 2.5.4.1.2.1..


2. Receipt of samples 4 prismatically shaped elements (cast from concrete) in accordance with item 2.5.4.1.2.1. of the above mentioned directive were placed at the clients disposal by the Polymer Institut and were returned to the Polymer Institut again coated, on 18.April 1994.

3. Coating composition
According to the information supplied by the client, the prisms were coated as follows: (see Table1 : coating thicknesses and waiting times between the application of the coating layers ).

4. Tests
  • 4.1 Ageing
    In deviation from the requirements of Section 4 of the above-mentioned directive, relating to ageing behaviour with artificial weathering (item 2.5.4.4) as a preliminary test before crack bridging, the test elements were stored in an incubator at a temperature of 70 degrees celsius for a period of 7 days in the case in question.

    After this heat storage period, the test elements were stored in normal climatic conditions DIN50014-23/50-2 for a period of 14 days.

  • 4.2 Crack Bridging Test
    The test on suitability to bridge cracks was conducted on a servo-hydraulic Schenck, Hydropuls Model S59, rig with a 63kN-testing frame. Test conditions see Table2

5. Result After being subjected to the crack cycling test treatment, the coatings of all test elements showed that no cracks occured in the EVERLAST protective surface coating. There were no indications of a failure of the crack bridging function.

Tables
Table1: Coating thicknesses and waiting times between the application of the coating layers

Table 2: Test conditions for the crack bridging test


References
Polymer Institut - Research Institute for Polymeric Construction Materials
Dr. R. Stenner GmbH
Quellenstrasse 3
65439 Flörsheim-Wicker
Germany