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CRB GmbH | macroscopic  photo asphalt drill core | © CRB Analyse Service GmbH

Quantitative analysis for asbestos in road pavings, asphaltic material and mineral powders and dusts in accordance with BIA procedure 7487

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  • The quantitative determination of mass content of asbestos in road pavings, asphaltic material and mineral powders and dusts according to TRGS 517, BIA procedure 7487

  • Preliminary examination, qualitative, as a powderised sample in accordance with guideline VDI 3866, page 5. According to “Data sheet on the disposal of asbestos-containing waste” of NGS Ltd.

  • Determination of Polycyclic aromatic hydrocarbon, PAHs according to EPA in collaboration with partner laboratories.

CRB GmbH | Sample preparation of asphalt for asbestos analysis | © CRB Analyse Service GmbH

General information on asbestos in road pavings, asphalt

Road pavings, in this case asphalt, consist of a mixture of the binder bitumen and gravel from natural stones. In particular basic magmatic stones like basalt, diabase or gabbro are often used for the highly stressed surface course.

 

These often have a natural content of asbestos minerals from the amphibole family like actinolite, tremolite, anthophyllite, amosite (grunerite).

Asbestos fibres may be released by mechanical stress during pavment cutting, especially cold planing of paved traffic areas and recycling or re-used in road construction. They are a potential health hazard for workers, residents and road users.

 

Technical rule TRGS 517 describes safety measures concerning the working process with naturally asbestos-containing mineral raw materials and any product or mixture derived from them. It prescribes that BIA procedure 7487, BGIA 7487 - measures regarding the analytical determination of low mass contents of asbestos fibres in powders and dusts by SEM/EDX, figure 7487 – is to be used for the determination of the asbestos mass content.

 

Alternatively, according to NGS “Data sheet on the disposal of asbestos-containing waste” testing for asbestos in bitumen or tar –containing road construction waste - can be made according VDI guideline 3866, page 5.

Provided that no further fibres can be detected no further testing is necessary. If fibres can be detected according to this procedure quantification according to BIA procedure 7487 is compulsive.

  • Asbestos minerals: actinolite-tremolite, amosite (grunerite)-anthophyllite, seldom chrysotile in bitumen
  • Binder (matrix): bitumen
  • Further components: partly fibrous minerals: olivine, pyroxene, non-asbestos amphibole (hornblende), feldspar, mica, quartz, calcite, epidote
  • Similar, asbestos-free products: asbestos-free asphalts, e.g. with limestone as aggregate
SEM-picture of amphibole asbestos, anthophyllite in plasters, trowlled on materials and paints | © CRB Analyse Service GmbH

Amphibole asbestos, anthophyllite, in asphalt – SEM image

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