THE CONTRIBUTION OF PERVIOUS MACADAM SURFACING TO THE STRUCTURAL PERFORMANCE OF ROADS
Although the spray-reducing properties of pervious macadam surfacing are well known, there is a distinct lack of information available about its structural performance. As a result its structural contribution is not considered in the design of new roads or bituminous overlays. The structural strengthening brought about by laying pervious macadam surfacings on existing roads has been assessed by using linear elastic theory to compute the stresses and strains induced in the pavements by vehicle loading before and after surfacing with the pervious macadam. These computations predicted a significant reduction in the magnitude of stresses and strains after surfacing, a result which was confirmed in practice by direct measurement on a full-scale road pavement. Stress and strain computations were then used to determine the structural contribution of 40 mm of pervious macadam surfacing in terms of equivalent thicknesses of rolled asphalt surfacing and rolled asphalt and dense bitumen macadam roadbases for the present recommended designs of road pavements. (Author/TRRL)
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Corporate Authors:
Transport and Road Research Laboratory (TRRL)
Wokingham, Berkshire United Kingdom -
Authors:
- POTTER, J F
- Halliday, A R
- Publication Date: 1981
Media Info
- Features: Figures; References; Tables;
- Pagination: 19 p.
- Serial:
Subject/Index Terms
- TRT Terms: Axle load force; Before and after studies; Bituminous macadam; Calculation; Deformation curve; Drainage blankets; Durability; Elasticity (Mechanics); Experimental roads; Linear elasticity; Loads; Overlays (Pavements); Pavement design; Pavements; Permeability; Reduction (Chemistry); Strain (Mechanics); Surface course (Pavements); Surfacing; Thickness; Traffic loads
- Uncontrolled Terms: Decreases
- Old TRIS Terms: Pervious blankets; Reduction
- ITRD Terms: 3067: Axle load; 9148: Before and after study; 4921: Bitumen macadam; 6464: Calculation; 9009: Decrease; 5595: Deformation; 5910: Durability; 5912: Elasticity; 2778: Experimental road; 5567: Load; 3055: Pavement design; 5921: Permeability; 3096: Strengthening (pavement); 2972: Surfacing; 5933: Thickness
- Subject Areas: Design; Freight Transportation; Highways; Materials; Pavements; I22: Design of Pavements, Railways and Guideways; I31: Bituminous Binders and Materials;
Filing Info
- Accession Number: 00348934
- Record Type: Publication
- Source Agency: Transport Research Laboratory
- Report/Paper Numbers: LR 1022 Monograph
- Files: ITRD, TRIS, ATRI
- Created Date: May 28 1982 12:00AM