Laboratorieanalyser av filler: prover från täkter i norra Norrland

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Leif Viman

Extensive damage on the road E4 along the northeast coast of Sweden in the winter of 2007/2008, probably caused by the mild climate with plenty of moisture and many freeze-thaw fluctuations, brought up the issue of the need for specific requirements for the filler used in asphalt production. Aggregate from this area is sometimes very mica-rich and/or contains other "sensitive" minerals.

The project aims to examine the methods that are relevant for the filler according to product standard EN 13043 "Aggregates for bituminous mixtures and surface treatments for roads, airfields and other trafficked areas".

Ten different filler materials have been included in this study. Nine of these were taken from quarries along the north coast of Sweden (in some cases from inland areas), while the tenth is a reference material from a quarry in the county Östergötland. All materials are tested for a number of different properties. The test methods used are primarily from the product standard EN 13 043, while the purpose of this study is to assess the quality of filler from the point of suitability for asphalt. The materials consist of sorting 0/2, 0/4 mm and/or filler (mostly <0,063 mm) and were sieved to test fractions in the laboratory, which in most cases was 0-0,125 mm.

Most results in this study fall into the lowest of the listed classes for each method in the product standard EN 13043. The reason is probably that the Swedish bedrock generally does not contain the kind of sensitive fine material, type swelling clay minerals, etc., which are common on the continent, and the standard is likely to be suited for.

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