Temperature correction method of sensor measured texture depth index based on equivalent temperature of asphalt surface layer

Abstract

Texture depth is one of the most important indexes reflecting the skid resistance performance of asphalt pavement. Temperature has effect on the texture depth of asphalt pavement. There is no effective temperature correction method on the texture depth index in China, which leads to the phenomenon that the test texture depth could not reflect the true skid resistance performance of pavement structure. In order to effectively analyze the temperature influence on the skid resistance of asphalt pavement, a temperature correction method of sensor measured texture depth (SMTD) index was proposed based on the SMTD data and equivalent temperature of asphalt surface layer in RIOHTrack full-scale track. The annual equivalent temperature at 4cm location of asphalt surface layer was taken as the correction reference temperature. The Boltzmann function was adopted to establish the relationshi p between the SMTD index and the daily equivalent temperature of asphalt surface layer. The mean square error of temperature correction model for SMTD index is 0.977. The maximum error of temperature correction model for SMTD index is 2.601%, which meets the detection requirements on road engineering. The temperature correction method is significant to reflect the SMTD index change of pavement skid resistance performance, improve the evaluation accuracy of pavement skid resistance, and improve the safety of driving on highway.