Abstract
The polished stone value (PSV) of coarse aggregate is closely related to pavement skid resistance and traffic safety. However, the determination of the PSV of coarse aggregate is conventionally a time- and energy-intensive process. To facilitate the test process of PSV in materials selection and pavement design and for the prediction of the service life of aggregate materials in practical service, here a new mathematical model of PSV attenuation in coarse aggregate, which employs a physical polishing process analysis, is proposed. The PSVs of four types of coarse aggregates (calcined bauxite, granite, basalt, and limestone) were analyzed through a polishing experiment, and the corresponding mechanism was investigated via scanning electron microscopy analysis. The modeling results are in good agreement with experimental results. The aggregate PSV is affected by both the macrotexture and microtexture of the aggregate surface. The PSV due to the macrotexture exhibits a strong negative correlation with the Vickers hardness of the aggregates and decreases exponentially as the polishing time increases. The attenuation rate decreases as the fractal box dimension in the aggregate surface morphology increases. The primary factor influencing the macrotexture service life and the half-life is the aggregate surface morphology. The PSV due to the microtexture exhibits a strong positive correlation with the Vickers hardness of the aggregates, whereas there is a poor correlation with the aggregate surface morphology and polishing time. The proportion of the aggregate PSV due to the microtexture increases as the aggregate hardness increases. These results highlight the effectiveness of a new modeling approach that may potentially assist in predicting the anti-slip performance and durability of coarse aggregates.
Highlights
Skid-resistance of a pavement is considered one of the most important factors affecting traffic safety [1], as good anti-skid performance can reduce traffic accidents by providing sufficient adhesion for the vehicle tires, while low skid resistance means poor friction and can increase the risk of accidents.The exposed aggregate on the pavement surface will gradually become polished and worn by traffic, which will reduce its anti-skid performance and eventually create a safety hazard
Investigations show that many highway traffic accidents are related to insufficient pavement skid resistance [2,3], with the particle shape, physical properties, and variations in the coarse aggregate on the pavement surface exerting important effects on its anti-skid performance [4,5]
The polished stone value (PSV) of coarse aggregate is closely related to pavement skid resistance
Summary
Skid-resistance of a pavement is considered one of the most important factors affecting traffic safety [1], as good anti-skid performance can reduce traffic accidents by providing sufficient adhesion for the vehicle tires, while low skid resistance means poor friction and can increase the risk of accidents. Pavement surfaces with high PSV coarse aggregate have a higher skid resistance, which improves vehicle safety [6,7,8]. China have clear requirements and provisions on the PSV of coarse aggregate, which is a key index for determining whether a certain aggregate can be used in the anti-sliding abrasion layer of an asphalt pavement. It is of great significance to study the skid resistance characteristics of coarse aggregate and derive a PSV attenuation law to facilitate better-informed material selection for pavement design and construction and predict the service life of aggregate materials in practical settings. A mathematical PSV attenuation model for coarse aggregate was constructed through a theoretical analysis of the polishing process to investigate the sliding-resistance changes in coarse aggregates over time, and experimental observations were analyzed and compared to validate the proposed model, for simplifying the PSV test process and predicting the performance of the coarse aggregates in service
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