We are very interested in the interface shear of different geosynthetic interlayer products installed with their recommended amount of tack oil. We believe the grid only products and the products with very light carrier nonwoven geotextiles may not give as high of a shear resistance as the full weight nonwoven paving fabrics. Some products recommend no tack and some recommend as little as 0.10 gallon/square yard. Full AASHTO M 288 paving fabric Type II uses 0.25 gallon/square yard. We also fear that the grid products with the very small aperture size of 12.5mm may not interact well with the adjacent pavements and may introduce a shear plane. Please comment and share research on these issues. We may be interested in sponsoring more research.
The shear bonding between geogrid and pavement is depends on aperture size of the grid is true. I feel you need to conduct shear test with varying aperture size of grid with pavement material and find out which one is giving better response. You even vary the aperture size and also various geosynthetic material can be used for the test. all the best..
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