The modified binder storage stability conundrum

Several questions has arisen in the recent past regarding the suitability and proper interpretation of the storage stability and polymer compatibility test protocol adopted in South Africa. The current interpretation of the storage stability results is costing the road user more in that; perfectly suitable polymer modified binders are being disqualified regionally, partly due to the conditioning temperature not being suitable, sample size, test dimensions and the use of the softening point as the qualifying criteria. This study evaluates the effects of alternative conditioning temperatures, sample size and equipment dimensions and the qualifying test method to narrow the gap between what is observed in the laboratory and what is actually being experienced in practice. It opens opportunities to include non-homogeneous binders and polymer modified hybrid technologies in a historically exclusive application. Results thus far indicate that higher temperatures may be required for proper sample preparation and conditioning as well as suspending higher modification levels within the bitumen matrix. Increasing sample size and equipment dimensions gives a more representative portrayal of what actually happens during plant scale manufacturing, storage and transport. Therefore, perfectly good binder that has been historically disqualified can now be properly evaluated and found fit-for-purpose.

Language

  • English

Media Info

  • Pagination: 7p
  • Monograph Title: 11th Conference on Asphalt Pavements for Southern Africa: CAPSA15, 16-19 August 2015, Sun City, South Africa

Subject/Index Terms

Filing Info

  • Accession Number: 01597142
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ATRI
  • Created Date: Apr 22 2016 11:17AM