Abstract
Grout materials were sometimes injected beneath the airport PC slabs to reinforce pavement subgrade. Its strength and deformation at the traffic opening should be precisely designed. However, a few of them were severely damaged in several years. To investigate the cause of failure, the authors conducted a series of model tests, while the grout failure similar to that found in-situ were observed in several test cases. Based on the observations in the tests, new grout materials were developed to assure the sufficient strength, even though they are injected into the water remained beneath the PC slabs.
