Precast Slabs for Contingency Rigid Airfield Pavement Damage Repairs (BRIEFING SLIDES)

摘要

A significant number of airfield pavements are constructed with Portland cement concrete. Proper serviceability of concrete slabs is restored by scheduled maintenance, which allows for optimal aircraft operations. Catastrophic damage of military airfield pavements in austere conditions, on the other hand, requires a well formulated contingency plan to efficiently and effectively restore the damaged sections. This study investigates the feasibility and efficiency of using different precast concrete panel installation techniques for contingency repair of damaged airfield pavements. Fast-setting polymer foam and flowable fill were selected as bedding materials and bonding agents after review of the literature. A deep-injection method as well as conventional leveling was used to account for the impact of leveling techniques in the experiment design. Performance of the repaired sections was characterized by load transfer efficiency, joint stiffness and deformation energy dissipated through the pavement foundation. A heavy weight deflectometer (HWD) and a military aircraft gear simulator were used to determine the stiffness properties and accumulation of plastic deformations after each load interval. Decay of joint stiffness and load transfer efficiency as well as increase in deformation energy were calculated as a function of number of load applications.