SPRAYED SEAL DESIGN USING THE VOIDS, AND THE VOID DISTRIBUTION WITH DEPTH IN LAYERS OF COVER AGGREGATE

The application of an alternative single-seal design procedure, particularly for seals laid on routes carrying less than 500 veh/d, is considered. The method is based on measurement of the voids content of a layer of the cover aggregate and then apportioning these voids between any substrate intruding into the layer, the binder and the surface (air) voids when the layer has been compacted to its final configuration in service. Australian data on the layer thickness, voids and voids distribution with depth in specimens of seal cut from the pavement have been fitted to models of single layers of uniform 'spherical' bodies to determine the final degree of packing and the attitudes of the particles in the seal. For seals laid on primed granular bases, the packing is near to that for orthogonal packing of 'spherical' bodies (each body touching four others) and the layer thickness is significantly greater than the average least dimension (ALD) of the aggregate. For pavements carrying 100 to 300 veh/d, between 7 and 18 per cent of the voids were occupied by the base immediately after construction but this intrusion was only slightly increased after three months' service. Data for longer periods of service are required. For seals laid on steel plates (equivalent to sealing a hard smooth base), the degree of packing was orthogonal or more open than orthogonal and the particles rapidly aligned themselves with a flat side roughly parallel to the substrate. Layer thickness approached the level of the ALD of the aggregate. Data on the voids and void distribution in double layers of spheres for two different degrees of packing of the lower layer are presented. When the packing is orthogonal, the model should be appropriate for the design of double seals laid on granular bases. (Author/TRRL)

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  http://arrbknowledge.com
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00050164
• Corporate Authors:

  ARRB

  Melbourne, Victoria  Australia 
• Authors:
  • Dickinson, E J
• Publication Date: 1990-6

Language

• English

Media Info

• Features: References;
• Pagination: p. 38-53
• Serial:
  • Publication of: Australian Road Research Board
  • Volume: 20
  • Issue Number: 2
  • Publisher: ARRB
  • ISSN: 0005-0164

Subject/Index Terms

• TRT Terms: Aggregates; Seasons; Sprays (Materials); Void ratios
• Old TRIS Terms: Void
• ITRD Terms: 4577: Aggregate; 8006: Australia; 4948: Binder; 3686: Compaction; 3655: Construction; 8623: Data acquisition; 9011: Design (overall design); 4107: Granular; 2952: Layer; 2774: Low traffic road; 6473: Mathematical model; 6136: Measurement; 9102: Method; 9054: One; 6408: Orthogonal; 5938: Porosity; 2961: Roadbase; 3491: Slab; 4542: Steel; 6438: Surface; 2984: Surface dressing; 5933: Thickness
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00609414
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS, ATRI
• Created Date: Jun 30 1991 12:00AM