Abstract:

In this paper,first,a model to describe the uniform temperature drop of BFRP ( Basalt Fiber-Reinforced Plastics) bar-reinforced CRCP ( Continuously Reinforced Concrete Pavement) is proposed.Next,by taking into consideration the dry shrinkage of concrete and the constraint by base,the formulas for the analytical solution of such crack control indicators as crack spacing,crack width and reinforcement stress are derived and verified through finite element simulation.Then,the effects of BFRP bar design and the corresponding material properties on crack control indicators are analyzed,and the indicators for the reinforcement design of BFRP-reinforced CRCP are recommended.The results show that ( 1) the crack spacing,crack width and reinforcement stress of BFRP bar all decrease with the increase of the percentage of longitudinal reinforcement,and smaller diameter and spacing of BFRP bar is better for the control of cracks at the same percentage of longitudinal reinforcement; ( 2) with the increase of the elastic modulus of BFRP bar and with the bond stiffness between BFRP bar and concrete,both the crack spacing and the crack width decrease,while the reinforcement stress of BFRP bar almost remains unchanged; and some engineering countermeasures should be adopted to improve the elastic modulus of BFRP bar and the bond stiffness coefficient between BFRP bar and concrete.Moreover,for the reinforcement design of BFRP-reinforced CRCP,three crack control indicators are recommended,namely an average crack spacing limit of 2. 0 m,a crack width limit of 1. 0mm and a percentage of longitudinal reinforcement of not less than 0. 6%.

Key words: road engineering, reinforcement design, analytical method, BFRP-reinforced, CRCP, uniform temperature drop, concrete shrinkage