Field assessment of rigid pavement stabilisation using cementitious grout: case study

On the 2nd runway of Shanghai Pudong International Airport, the field assessment was conducted for rigid pavement stabilization using cementitious grout. The support performance of underlying layers and voids beneath slabs were considered, and the deflection testing was performed before and after grouting. The performance of pre-treatment and post-treatment pavements, and effects of injecting depth and curing time on grouting treatment were statistically analyzed. Results indicated that the support performance of underlying layers along the wheelpath was gradually getting deteriorated and non-uniform during the service period, and the number of voids beneath slabs would also increase annually. The injecting depth at 10 cm under subbase layer was proposed for rigid pavements with the crushed stone subbase layer. Besides, the performance evaluation of cementitious grouting stabilization for rigid pavement was recommended after 60-day curing. Finally, results demonstrated that the objective of pavement stabilization for the 2nd runway was successfully achieved.