Theoretical Research on Three Points Regression Method for Identifying the Voids of Concrete Pavement

The void model with the consideration of contact is established based on the mechanism of void development. The concept of Contact Compensation is first put forward, and it is pointed out that the Contact Compensation is the essential reason to result in the intercept of relationship between load and deflection in the three points regression method for identifying the voids of concrete pavement. The contact condition between concrete slab and the base in void region is analyzed by using nonlinear finite element method. The results show that the correlation of Contact Compensation and slope-difference is very good. The achievements will be the base for quantificationally identifying the voids of concrete pavement.