An Approach Towards the Understanding and Design of the Pavement’s Textural Characteristics Required for Optimum Performance of the Tyre
Pavement wet skid resistance is characterized and governed by its macro-texture required to dissipate bulk water, and its micro-texture, essential for the creation of real areas of contact with the tread rubber.
Pavement macro-texture is also a major factor controlling noise generation, spray generation, and ride performance of tyres; and the micro-texture helps control the wear rate of tyres.
A theoretical approach to optimise the potential real area of contact between the rolling tyre and the pavement whilst maintaining adequate water drainage is discussed. The resulting macro-texture recommendation is shown to produce lower tyre noise and superior ride characteristics to other surfaces with similar levels of water dissipation.
The minimum level of micro-texture is related to the thickness of the water film; increasing levels of micro-texture are shown to increase tyre wear without a proportional increase in the wet friction. Direct observation of micro-texture characteristics of various aggregates has led to levels of maximum and minimum levels of micro-texture being suggested. The concepts of micro- and macro-texture optimisation have been applied to a new form of wearing course mix design currently undergoing road trials. The results from these experiements are used to support the theoretical approach.
Improved pavement surfaces will influence tyre design, some aspects of which are discussed.
KeywordsWear Rate Road Surface Development Surface Pavement Surface Contact Patch
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- 1.M. M. Miller, H. D. Johnson, “Effect of Resistance to Skidding on Accidents Surface Dressing on Elected Surface of M4 Motorway,” Transport and Road Research Laboratory, Report LR542, 1973.Google Scholar
- 2.G. Lees, R. L. Sharif, “The Design and Field and Laboratory Testing of High Friction Dense Asphalts,” The Highway Engineer, pp. 4-20 June 1973.Google Scholar
- 3.G. Lees, “The Rational Design of Aggregate Gradings for Dense Asphaltic Compositions,” Proceedings Association of Asphalt Paving Technology, 39, pp. 30–69, 1970.Google Scholar
- 4.G. Lees, “The Rational Design of Continuous and Intermittent Aggregate Gradings for Concrete,” International Symposium on the Grading of Concrete Aggregates H.R.B., January 1973.Google Scholar
- 5.B. E. Sabey, “Road Surface Characteristics and Skidding Resistance,” J. British Granite and Whinstone Federation Vol. 5, No. 2, 1965.Google Scholar
- 6.A. R. Williams, T. Holmes, G. Lees, “Toward the Unified Design of Tyre and Pavement for the Reduction of Skidding Accidents,” SAE Paper No. 720162, Detroit Michigan, January 1972.Google Scholar
- 8.G. Lees, A. R. Williams, “The Relation Between Tyre and Road Surface Design,” I.R.F. meeting, Munich, October 1973.Google Scholar
- 9.D. Bulgin, M. H. Walters, “The Abrasion of Elastomer Under Laboratory and Service Conditions,” Inst. Rubber Conference, Brighton, England, 1967.Google Scholar
- 10.F. C. Brenner, A. Kondo, G. B. Cohen, “Research for a Uniform Quality Grading System for Tyres V. Effect of Environment on Tread Wear Rate,” Rubber Chemistry and Technology 44, p. 4, 1971.Google Scholar
- 11.A. R. Williams, G. Lees, “A Machine For Friction and Wear Testing of Pavement Surfacing Materials and Tyre Tread Compounds,” Journal of the IRI, October 1973.Google Scholar
- 13.British Standards Institution BS594 Rolled Asphalt (Hot Process), 1961.Google Scholar
- 14.British Standards Institution BS812 Mineral aggregates, sands and fillers, 1969.Google Scholar
- 15.M. C. P. Underwood, “A Preliminary Investigation into Lorry Tyre Noise,” Transport and Road Research Laboratory Report to be published 1973.Google Scholar
- 16.V. E. Gough, C. W. Barson, J.C. Hutchinson, D.H. James, “Tyre and Vehicle Vibration,” Institute of Mechanical Engineers, 179, 2A, 1964-65.Google Scholar
- 17.Sideway Force Routine Investigation Machine, T.R.R.L., Crowthorne England.Google Scholar
- 18.H. C. A. van Eldik Thieme, H. B. Pacejka, “The Tyre as a Vehicle Component,” Chapter 7, Mechanics of Pneumatic Tyres, edited by S. K. Clark N.B.S., Monograph 122, 1971.Google Scholar
- 19.D. Bulgin, D. G. Hubbard, M. H. Walters, “Road and Laboratory Studies of Friction of Elastomers,” 4th International Rubber Conference, London, 1962.Google Scholar