This document specifies test methods for determining the rates of spread and accuracy of spread of binder and chippings of a surface dressing on a section of road at a given time.
NOTE This test method can also be used for determining the rate of spread and accuracy of spread of sprayed bituminous emulsions, e.g. when used as bond coats or asphalt preservation systems. The performance categories for binder rate of spread and accuracy of spread in EN 12271 do not apply to bond coats and tack coats.
The test methods are used on site to check the ability of binder sprayers and chipping spreaders to meet the intended rates of spread and tolerances and coefficients of variation.
The test methods can be used to fulfil the Factory Production Control requirements:
- equipment calibration (EN 12271:2006, Annex B - Table B.2); and
- production inspection (EN 12271:2006, Annex B - Table B.6).
The calibration of binder and chipping spreaders requires strict application of the procedures described in this document.
Using these methods for inspections during production (FPC) allows certain changes to these methods due to the specificity of certain sites and materials used (e.g. combined chipping-binder spreaders). In this case, the changes are documented in the Factory Production Control and identified in the test reports.
Other test methods used to check the rate of spread and accuracy of spread of binder, such as the static spray bar bench test for sprayers, are not covered by this document, although the test methods in this document can be used for this purpose.