Experimental Study on Performances of Various Bond-Breaking Layers atop Cement-Stabilized Bases

This research explored the performances of different bond-breaking layers installed atop the cement-stabilized bases to offer parameters for structure analysis of pavements with bond-breaking layers and to optimize the selection of bond-breaking layers for the practical road engineering projects. This research tested the bonding stresses and the frictional forces at slab-base interface of pavements under different bond-breaking conditions, as well as the anti-erosion performance of base. This was done through the anti-erosion tests in laboratory and the field tests for mechanical performance of slab-base interface treated with different bond-breaking layers of the Yunfu-Luoding highway project of Guangdong Province. Bond-breaking media applied in this research include the 1 cm emulsified asphalt slurry seal (EASS), geotextile and emulsion wax curing agent (EWCA). The findings from the field tests for bonding stress between slab-base layers indicated that EWCA did better than EASS in reducing friction or bonding stress between slab-base layers. Also, the findings from the anti-erosion tests indicated that under the same other conditions, the specimen covered with geotextile did better than specimen covered with EASS and far better than specimen bond-breaking layer in resisting water erosion. The performance of slab-base interface with different bond-breaking media derived from this research offers scientific reference to pavement design and construction control in the practical road engineering projects.