THE EFFECT OF MICRO-MINERAL PARTICLES ON THE AGGREGATE/HYDROCARBON INTERFACE. DURABILITY AND PERFORMANCE OF BITUMINOUS HIGHWAY MATERIALS, HATFIELD POLYTECHNIC, 3-4 APRIL 1989

This article investigates the effect of dust upon the adhesion of chippings to binder, especially the effect of micro mineralic particles such as quartz. Evidence is put forward to indicate that the current BS specification (BS 63 part 1 and 2 : 1987 (see IRRD 806489-806490) for maximum dust content be altered from 2% to 1% for sound rock and 0.5 for slightly altered rock. The ingstron tensile test was adopted to perform tensile tests, i.e. The force (load) required to pluck clean or dusty chippings from a bituminous surface. In the same way, clean or dusty aggregate was placed and fixed in the upper jaw and the bitumen tray fixed in the lower jaw. The 2 specimens were then brought together by means of the drive screw on the ingstron machine. With the bitumen still soft, the adhesive bond was allowed to form and after approximately 1 hour under the correct conditions, the test was performed. Overall the effects of 0.5, 1.0 and 1.5% dust content on the surface of the aggregate and the resultant adhesion relationship with the bitumen was determined. Different types of aggregate were assessed along with aggregates of similar rocktype but of different soundness values. (dolorite, dyke, porphyritic basalt or lithomarge). It was found that a relationship did exist between load and soundness, load and percentage dust, and load and mineral type. Both clay and quartz lowered the adhesion between the stone and the binder. For the covering abstract of the conference see IRRD 823743.

• Corporate Authors:

  Hatfield Polytechnic, England

  School of Engineering, College Lane, P.O. Box 109
  Hatfield, Hertfordshire,   England 
• Authors:
  • WOODSIDE, A R
  • CRAIG, C
• Publication Date: 1989

Language

• English

Media Info

• Pagination: 12 p.

Subject/Index Terms

• TRT Terms: Adhesion; Aggregates; Binders; Bituminous macadam; Clay; Conferences; Dust; Measurement; Minerals; Quartz; Standards
• Geographic Terms: United Kingdom
• Subject Areas: Data and Information Technology; Geotechnology;

Filing Info

• Accession Number: 00498700
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Sep 30 1990 12:00AM