The Effect of Asphalt Concrete Micro & Macro Texture on Skid Resistance

Document Type : Regular Paper


1 Assistant Professor, Road Safety Dept., Transportation Research Institute, Iran University of Science & Technology (IUST), Tehran, Iran

2 M.Sc., Graduate, Highways & Transportation, Tehran, Iran


Skid resistance and road condition are common indices of road safety; therefore providing adequate skidding resistance will reduce the incidence of road accidents. The surface macrotexture has a large effect on the characteristics of road surface skidding, which is the focus of this research. During the study, the mean texture depth of the road surface was measured, in order to determine the conditions that ensure the maximum contact area between the vehicle tires and road surface during wet conditions. The Pavement Guideline No. 234 was consulted for the test procedure and road surface composition, which used open and dense graded crushed lime aggregates with varying percentages of bitumen applied to the mix design. The samples were then tested to assess their stability using the Marshall and Gyratory Tests. The results showed that with the application and evaluation of the sand patch method, where the effect of the macrotexture on skidding resistance was analyzed with various gradations, there was an improved higher skidding resistance and a subsequent projected reduction of accidents with an increased safety.


[1] OSRTTR, (2010). “Road transportation statistical yearbook”. Organization of State Road Tax and Transportation of Road, Department of Technology and Information.
[2] Asi, I.M. (2007). “Evaluating skid resistance of different asphalt concrete mixes”. Building and Environment, Vol. 42, No. 1, pp. 325-329.
[3] ASTM E867, (2004). “Terminology relating to vehicle pavement systems”. American Society for Testing and Materials.
[4] Shahin. M.Y. (1994). “Pavement management for airports, road, and parking lots”. Second Edition, Chapman & Hall.
[5] Bazlamit, S.M., Reza, F. (2005). “Changes in asphalt pavement friction components and adjustment of skid number for temperature”. Journal of Transportation Engineering, Vol. 131, No. 6, pp. 470-476.
[6] OSRTTR, (2010). "Annual Report of Forensic Medicine", Organization of State Road Tax and Transportation of Road, Department of Safety and Traffic of Organization of State Road Tax and Transportation of Road.
[7] MRT, (2011). “Iran road pavement code”. Ministry of Road and Transportation , Code No.234, Iran.
[8] ASTM E303-93, (2003). “Test method formeasuring frictional properties using the British pendulum tester”. American Society for Testing Materials, Philadelphia, U.S.A.
[9] ASTM E965-96, (2006). “Test method for measuring pavement macrotexture depth using a volumetric technique”. American Society for Testing and Materials, U.S.A.
[10] Huang, Y.H. (1993). “Pavement analysis and design”. University of Kentucky, New Jersey.
[11] MRT, (2007). “Determination of effect of compaction technique (Dynamic, Static, Gyratory...) on optimum asphalt percentage in asphalt concrete mix design, (Laboratorial-field)”. Technical and Soil Mechanics Laboratory of Ministry of Road and Transportation, Last Report Modified, Research and Scientific Investigation Office, Iran.
[12] ASTM, (2008). “Road and paving materials, pavement management technologies”. American Society for Testing and Materials, Annual Book of ASTM Standards, Vol. 4.03.
[13] BPM, (2000). “Operation manual of the british pendulum skid resistance tester”. British Pendulum Manual, United Kingdom, Wessex Engineering Ltd.