Jämförande provning – grovsiktning :ballast 2018

Interlaboratory comparison – coarse material sieving :aggregate 2018

This report shows results, some statistical analysis and precision data for interlaboratory comparison (round robin) in Sweden performed on a proportioned base layer material of crushed rock for grain size distribution according to TDOK 2014:0145 (coarse material sieving) and EN 933-1:2012 (sieving on 0/16 mm). There were 48 laboratories participating. In the sieving on coarse material, = 16 mm, the deviations are small (standard deviations approx. 0,7%) and the difference between maximum and minimum value for each sieve is only 3–4%. The results for material finer than 16 mm (relatively to whole of the sample) are deviations wider. Especially for sieves 1/11,2 mm with difference between maximum and minimum values are up to 7% and the standard deviation for those sieves are around 1,4%. For sieves finer than 1 mm (0,5 mm and less) the differences are less than 3% and the standard deviation is less than 0,8%. The spreading’s for the fine material sieving is wider than for the coarse sieving part. It could depend on less accurate gradings on the fractions finer than 16 mm that were used in the proportioning. For the coarse sieving the whole sample (18 kg) were the test portion, for the fine sieving the material 0/16 mm had to be divided to get the test portion (approx. 2,6 kg). The dividing can also be one of the reasons to less accurate results for the 0/16 mm-part.

Language

  • Swedish

Media Info

  • Pagination: 43
  • Serial:
    • VTI NOTAT
    • Issue Number: 17-2019
    • Publisher: Swedish National Road and Transport Research Institute (VTI)

Subject/Index Terms

Filing Info

  • Accession Number: 01739092
  • Record Type: Publication
  • Source Agency: Swedish National Road and Transport Research Institute (VTI)
  • Files: ITRD, VTI
  • Created Date: May 14 2020 9:42AM