Pavement deflection value: understand the calculation method and measurement process.

Pavement deflection value is an important index reflecting pavement strength, and it is also an important basis for pavement design and evaluation. This paper will introduce the calculation method and measurement process of pavement deflection value to help readers better understand the performance and service life of pavement.

Understand the rebound deflection value

Rebound deflection value is an important index reflecting the strength of pavement, which can reflect the ability of pavement to resist vertical deformation. A larger deflection value means that the pavement is weak in deformation resistance, while a smaller deflection value means that the pavement can bear more repeated wheel loads.

Calculation method of pavement design deflection value

The thickness of new asphalt pavement is calculated by the design deflection value. Design deflection value is an index to represent the overall rigidity of pavement, and it is the main basis for pavement thickness calculation. The calculation method of pavement design settlement value ld is based on the highway grade, the cumulative equivalent axle times Ne of lanes in the design life, and the type coefficient of surface and base, and is obtained through a specific formula.

Calculation method of pavement deflection value

The deflection value of pavement can be calculated by related formulas, and this process involves some specific parameters and formulas. Understanding these calculation methods is very important for evaluating the performance and service life of pavement.

Acquisition of measured value of pavement deflection

In order to accurately understand the actual performance of the pavement, we need to measure the pavement and obtain the measured deflection value ls. This value is calculated according to the tire contact pressure, equivalent circle radius, theoretical deflection coefficient ac, deflection comprehensive correction coefficient F and rebound modulus of soil foundation of standard vehicles. Through these data, we can have a deeper understanding of the actual situation and performance of the pavement.