Document ID: chunk:federal_register_of_legislation:F2021C00509:front:0:p51
Version: federal_register_of_legislation:F2021C00509
Segment Type: other
Provision Reference: 
Character Range: 147123–150159

the test strip (of 3 m width in Figure 1) where vehicles are driving, provided the test area outside the strip met the requirement of residual voids content or sound absorption when it was measured.

6. Documentation of the test surface and of tests performed on it

6.1. Documentation of the test surface

           The following data shall be given in a document describing the test surface:

6.1.1. The location of the test track.
           6.1.2. Type of binder, binder hardness, type of aggregate, maximum theoretical density of the concrete (DR), thickness of the wearing course and grading curve determined from cores from the test track.

           6.1.3. Method of compaction (e.g. type of roller, roller mass, number of passes).

           6.1.4. Temperature of the mix, temperature of the ambient air and wind speed during laying of the surface.

6.1.5. Date when the surface was laid and contractor.

6.1.6. All or at least the latest test results, including:

6.1.6.1. The residual voids content of each core.

           6.1.6.2. The locations in the test area from where the cores for voids measurements have been taken.

           6.1.6.3. The sound absorption coefficient of each core (if measured).
           Specify the results both for each core and each frequency range as well as the overall average.

           6.1.6.4. The locations in the test area from where the cores for absorption measurement have been taken.

           6.1.6.5. Texture depth, including the number of tests and standard deviation.

           6.1.6.6. The institution responsible for tests according to paragraphs 6.1.6.1. and 6.1.6.2. and the type of equipment used.

           6.1.6.7. Date of the test(s) and date when the cores were taken from the test track.

           6.2. Documentation of vehicle noise tests conducted on the surface

           In the document describing the vehicle noise test(s) it shall be stated whether all the requirements of this standard were fulfilled or not. Reference shall be given to a document according to paragraph 6.1. describing the results which verify this.

Annex 5

EXHAUST SYSTEM (SILENCER)

            1. Fibrous absorbent material must be asbestos-free and may be used in the construction of silencers only if suitable devices ensure that the fibrous material is kept in place for the whole time that the silencer is being used and it meets the requirements of any one of paragraphs 1.1., 1.2. and 1.3.

           1.1.                                              After removal of the fibrous material, the sound level must comply with the requirements of annex 3 and the sound level limits of annex 4.

           1.2.                                              The fibrous absorbent material may not be placed in those parts of the silencer through which the exhaust gases pass and must comply with the following requirements:

           1.2.1.                                        The material must be heated at a temperature of 650 +/- 5 degrees C for four hours in a