RELATIVE STRENGTH OF FLEXIBLE PAVEMENT BASES WITH DISCUSSION

THE DATA AND OBSERVATIONS OBTAINED FROM THIS STUDY BROADENED THE BASIS OF KNOWLEDGE OF MATERIALS USED IN LAYERED PAVEMENT SYSTEMS IN SOUTH CAROLINA. IT WAS NOTED THAT THE RELATIVE STRENGTH COEFFICIENT OF UNBOUND GRANULAR BASE MATERIALS WHICH HAD NO CEMENTING CHARACTERISTICS DECREASED WITH INCREASING THICKNESS OF THE LAYER. CEMENTED MATERIALS, INCLUDING THE BITUMINOUS STABLIZED MACADAM, SHOWED AN INCREASE IN STRENGTH AS THICKNESS INCREASED. VARIATIONS WERE ALSO NOTED FOR REASONS OF ENVIRONMENT AND SUPPORT AND APPROPRIATE CHANGES IN THE RELATIVE STRENGTH COEFFICIENTS WERE RECOMMENDED ON THE BASIS OF EXPERIMENTAL DATA. RELATIVE STRENGTH VALUES FOR ALL BASE AND SUBBASE MATERIALS WERE INTERPOLATED FOR VARIOUS THICKNESSES AND APPLICATIONS, AND THE VALUES REPRESENTING THE BEST JUDGEMENT OF THE INVESTIGATORS WERE RECOMMENDED FOR DESIGN PURPOSES. THE RECOMMENDED VALUES ARE BASED ON ELASTIC DEFORMATION AND DO NOT CONSIDER RUTTING CAUSED BY DISPLACEMENT OR COMPACTION OF THE VARIOUS LAYERS UNDER TRAFFIC, OR DETERIORATION OF THE PAVEMENT DUE TO WEATHERING. ALTHOUGH THE SUBGRADE MODULUS MAY BE RELATIVELY LOW, THE ADDITION OF HIGHER MODULUS SUBBASE OR BASE LAYERS WILL INCREASE THE COMPOSITE OR OVERALL SUPPORT STIFFNESS OF THE BOUNDARY ON WHICH THE NEXT INCREMENTAL LAYER OF BASE MAY BE ADDED. RELATIVE STRENGTH COEFFICIENTS FOR SAND ASPHALT, BITUMINOUS STABLIZED MACADAM, UNBOUND MACADAM, SPOIL STABLIZED AGGREGATE, CRUSHED DOLOMITIC LIMESTONE, FOSSILIFEROUS LIMESTONE AND CEMENT STABILIZED MACADAM BASES WERE EVALUATED. A DISCUSSION IS INCLUDED WHICH DEALS WITH VARIOUS QUESTIONS ARISING FROM THIS STUDY.

• Supplemental Notes:
  • 1 APP
• Authors:
  • Rostron, J P
  • Busching, H W
  • Roberts, F L
• Conference:
  • Association of Asphalt Paving Technologists Proc
• Publication Date: 1972

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 626-63
• Serial:
  • Volume: 41

Subject/Index Terms

• TRT Terms: Asphaltic sand; Base course (Pavements); Bituminous mixtures; Cement treated soils; Crushed limestone; Elastic deformation; Modulus of elasticity; Pavement layers; Stiffness; Strength of materials; Subbase materials; Thickness
• Uncontrolled Terms: Cement treated bases
• Old TRIS Terms: Bituminous stabilized mixtures; Unbound pavement courses
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00211827
• Record Type: Publication
• Files: TRIS
• Created Date: Sep 17 2002 12:00AM