Abstract
In this paper, four antiskidding surface test sections were paved to investigate the long-term skid resistance of the improved dense-graded asphalt concrete in Guangdong Province (GAC) using diabase fine aggregate instead of limestone. Four test sections were tested by the accelerated loading equipment (MLS11, mobile load simulator). The reduction law of the long-term skid resistance of GAC-16 was analyzed based on the accelerated pavement testing results. Prediction models of the GAC-16 skid resistance were also established and verified. The evaluation indexes of the long-term skid resistance of the asphalt pavement were introduced, and the antiskidding durability of different sections was evaluated. Results show that the initial British pendulum number (BPN) and mean texture depth (MTD) of the asphalt pavement cannot completely characterize its long-term skid resistance. With increasing loading cycles, the attenuation law of the BPN and MTD of GAC-16 denotes a fast reduction during the early stage, which gradually stabilizes. The relation between the skid resistance index and accelerated loading cycles was analyzed by nonlinear fitting according to the least-squares-method principle. The attenuation law of the BPN and MTD of GAC-16 with loading cycles was in accordance with the exponential and logarithmic models, respectively. The long-term antiskidding performance of the asphalt pavement could be accurately characterized using a stable BPN, loading cycles while reaching a stable BPN, the initial MTD value, and the MTD reduction rate as the evaluation indexes of the skid resistance of asphalt pavement. Compared with limestone fine aggregate, diabase fine aggregate can improve the long-term skid resistance of the asphalt mixtures.
Highlights
Majority of the road traffic accidents can be attributed to the lack of skid resistance of pavement. e maintenance of road antiskidding performance ensures safe and fast driving [1, 2]
A previously conducted study has reported that the initial skid resistance of a dense-graded asphalt pavement is high, whereas its sideway force coefficient, which is an index of the skid resistance performance, rapidly decays within one or two years after opening to traffic and gradually declines until a relatively stable level [5]
Scholars [7,8,9,10] have characterized the effects of the asphalt mixture type, grading, asphalt content, and aggregate mechanical index on the antiskidding performance of the asphalt mixture, and the attenuation model was established through laboratory tests
Summary
Majority of the road traffic accidents can be attributed to the lack of skid resistance of pavement. e maintenance of road antiskidding performance ensures safe and fast driving [1, 2]. Eoretical simulation, indoor tests, accelerated pavement test, and surveys on test roads are some main methods that are currently used for evaluating the antiskidding performance of the asphalt pavements. Yang et al [6] performed a numerical simulation to establish a high-speed driving model for vehicles on wet roads and analyzed the skid resistance of the asphalt pavement under the combined effects of vehicles and water film. E decline in the skid resistance of the asphalt pavement tends to last for a long period, and accurate simulation of the actual driving conditions is difficult. The accelerated pavement testing is an effective methodology for evaluating the pavement performance at present It can simulate practical traffic situations on site. New evaluation index to characterize the long-term skid resistance of the asphalt pavement was introduced. e research results can be applied to optimize the antiskidding surface materials and provide a basis for road maintenance
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