Author: AB. Moore
Publisher:
ISBN:
Category : Dynamic tests
Languages : en
Pages : 10
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Book Description
Equipment was designed and built to conduct skid resistance tests at speeds up to 75 mph. Results of tests indicate that the skid performance of a pavement surface may be adequately projected from the standard 40-mph test speed. Texture measurements on surface cores may be used to predict 40-mph skid numbers (SN) with a reasonable degree of accuracy. SN's, determined from texture measurements, exhibit a high degree of correlation with locked wheel skid values.
Author:
Publisher: ASTM International
ISBN:
Category : Motor vehicles
Languages : en
Pages : 168
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Author: P. G. Roe
Publisher:
ISBN:
Category : Motor vehicles
Languages : en
Pages : 24
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Author:
Publisher: ASTM International
ISBN:
Category :
Languages : en
Pages : 159
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Author:
Publisher:
ISBN:
Category : Materials
Languages : en
Pages : 176
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Author: Murat Ergün
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
The fast development of car technology has led to a steady increase ofthe speed of the vehicles. International studies show that increase causes increase in the accidents. The transport infrastructure such as pavement surface texture has not followed this development. In the wet weather, even at low speed, the skid resistance between the road surface and tyre can be quite low. International studies emphasise that there is a relation between the accident rate and the friction coefficient. The main goal of this study is to analyse the influence of road surface texture on skid resistance. The ultimate goal is to investigate the possibility of assessing pavement skid resistance by means of a new model which only uses surface texture parameters. In Chapter 1, the influence of skid resistance on the accident rates isexplained. Then, necessity of monitoring to road surface texture is highlighted. Thedefination of the surface texture is made in Chapter 2. The main surface texturedescriptors are surface texture (microtexture, macrotexture, and megatexture) and(un)evenness (longitudinal- and transverse evenness). The measuring methods ofsurface texture and (un)evenness are explained in Chapter 3. The description of skid resistance is explained from the historical development point of view in Chapter 4. In Chapter 5, the measuring methods of skid resistance are explained. Nowadays, different methods are in use to measure skid resistance.The main factors that affect skid resistance are pavement surface texture, the tyre, vehicle speed, and water film thickness as explained in Chapter 6. Recent researches on those factors are demonstrated. Then, the previously proposed models about skid resistance are explained in Chapter 7. In Chapter 8, the tests to study the influence of surface micro- and macrotexture on skid resistance are explained as mainly field and laboratory tests.The field tests are namely: skid resistance test by Odoliograph, the macrotexture by Mobile Laser Profilometer, and low-speed skid resistance spot tests by British Pendulum. Then, the cores are extracted from these spots. In the laboratory test, the new contactless microtexture measurement method is developed by using the Image Analysis Technique and applied on the extracted cores to measure microtexture of samples.The results of field and laboratory tests are presented in Chapter 9. The analysis of the results is made in Chapter 10.Finally, this study concluded that it is possible to predict the skid resistance of road surfaces by means of a new model which only uses surface texture parameters. Also, the road surface microtexture can be measurable with using the Image Analysis Technique. This study shows that it should be possible for systematic network monitoring of low friction spots on the road surface by using fast, non-contact texture measurement methods in the future.
Author:
Publisher:
ISBN:
Category : Highway research
Languages : en
Pages : 962
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Author:
Publisher:
ISBN:
Category : Traffic safety
Languages : en
Pages :
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Author:
Publisher: AASHTO
ISBN: 1560514280
Category : Pavements
Languages : en
Pages : 87
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Book Description
This report contains guidelines and recommendations for managing and designing for friction on highway pavements. The contents of this report will be of interest to highway materials, construction, pavement management, safety, design, and research engineers, as well as others concerned with the friction and related surface characteristics of highway pavements.
Author: F. E. Behn
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 84
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