Evaluation of the Safety of Flexible Pavement using Skid Resistance Measurements.(Dept.C)

Mokhtar Ibrahim,Abdelzaher Mostafa,Ahmed Ali,Ahmed M

doi:10.21608/bfemu.2021.167014

Mokhtar Ibrahim, Abdelzaher Mostafa + Show 2 more

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https://doi.org/10.21608/bfemu.2021.167014

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Abstract

Skid resistance is one of the important parameters used in asphalt pavement characterization. Also, recently with wide extension in roads network over the world and high vehicles speed which lead to high record in accident rates. One of the accident causes is inadequate skid resistance. Various factors affect the skid resistance; some of these are material properties, vehicle speed, surface condition, pavement age, climate and contaminant type. Therefore, this study represents the effect of various contaminants on the skid resistance of asphalt pavement mixes. Two types of asphalt mixes were used; the first was fresh mix, while the second was reclaimed asphalt pavement (RAP) mix. The selected contaminants were water, lube oil and sand. Laboratory tests were performed for hot mix asphalt during (140 days for fresh and 75 days for Rap) and temperature variation range of (10-33)0C. British Pendulum (BP) Tester was used to identify the skid resistance values. The test was carried out of leveled flexible pavement slabs for both fresh and reclaimed mixes. Two sections for every slab were tested for both control and contaminated slab. The results indicated that British Pendulum Number (BPN) values changed by the change of contaminant type. Also, it was observed that the lowest values of BPN were investigated using lube oil compared to water and sand. Finally, Significant changes have been occurred in BPN values by the variation in mix type.

Highlights

ASPHALT mixes are widely used in both highways and airfields compared to rigid pavement; more than 90% of roads are constructed using asphaltReceived: (14 January, 2021) - Revised: (24 March, 2021) - Accepted: (28 March, 2021)Corresponding Author: Ahmed AbdELazim M.Ali, M.sc Student, Civil Engineering, High Institute of Engineering- El Shorouk Academy, Egypt.mixes [1,2]
This study investigated the values of skid resistance (BPN) number for the tested specimens as presented in Tables (6) and (7)
The reduction in British Pendulum Number (BPN) values may be due to the smooth layer formed on the slab surfaces which lead to the reduction in friction between the tester and pavement surface

Summary

Introduction

ASPHALT mixes are widely used in both highways and airfields compared to rigid pavement; more than 90% of roads are constructed using asphalt. Traffic safety and efficiency of the road system had increasing importance for management agencies. Friction evaluation has become an important tool in the management of pavement surfaces [3]. There are several causes of road accidents; one of these is the sliding texture of pavement surface. Uncontrolled skidding due to inadequate surface friction and poor visibility due to splash and spray have been found to be the two primary causes of wet weather crashes with skidding alone contributing to 15% to 35% of all wet weather accidents [4]. Acceptable pavement surface against sliding mainly depend on both of mix components and environmental conditions.

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