Transport Research International Documentation (TRID) https://trid.trb.org/ en-us Copyright © 2024. National Academy of Sciences. All rights reserved. http://blogs.law.harvard.edu/tech/rss tris-trb@nas.edu (Bill McLeod) tris-trb@nas.edu (Bill McLeod) Transport Research International Documentation (TRID) https://trid.trb.org/Images/PageHeader-wTitle.jpg https://trid.trb.org/ THE PERMITTIVITY TEST FOR BITUMEN https://trid.trb.org/View/56088 Wed, 14 Jun 1978 00:00:00 GMT https://trid.trb.org/View/56088 AN ACCEPTANCE TEST FOR BITUMEN FOR ROLLED-ASPHALT WEARING COURSE https://trid.trb.org/View/55390 0.5 msa; mixtures of bitumen with pitch or with lake asphalt have been required on these heavily trafficked roads. This report describes work carried out to develop a test for selecting suitable bitumens. A technique in which cores of different wearing-course materials could be inserted in road surfaces was developed to evaluate the performance of a range of bitumens under traffic. At the same time a number of laboratory tests were carried out on the bitumens and it was found that permittivity (dielectric constant) correlated best with development of texture in rolled asphalt, and that the order of merit was maintained irrespective of the composition of the asphalt and of the traffic carried. It was concluded that petroleum bitumen having a permittivity of 2.650 (25 degrees C, 1.59 khz) or more will provide a satisfactory texture under any conditions. The test is applicable only to 100 per cent petroleum bitumen. A method has been devised for measuring permittivity accurately. /Author/]]> Wed, 12 Apr 1978 00:00:00 GMT https://trid.trb.org/View/55390