Research On Rubber-Epoxy-Stone Waterproof Cohesive Transition Layer On Steel Deck Pavement

Waterproof cohesive layer plays an important role in steel deck pavement with the function of stress absorbing. However, due to the lack of recognition of interface security, disease cases of deck pavement have been constantly found in engineering. In view of these, rubber-epoxy-stone waterproof cohesive transition layer (REAS layer for short) was brought up based on EBCL of ERS steel deck pavement technology. In addition, rubber asphalt macadam seal technology was also introduced for the advantage of elasticity restoring and stress reduction. Choosing REAS layer as research object, some key performance including material optimization design, road service performance, composite pavement structure and construction technology were discussed in this paper.Firstly, based on proposing technical indicators of raw materials, revolving viscosity test and direct tensile test were done to determine the best adding ratio and particle size of rubber powder. Then, revolving viscosity test, tensile creep test and dynamic shear test were carried out to evaluate the performance of rubber modified epoxy bond. Meanwhile, viscosity time-temperature dependency model based on dual Arrhenius equation, tensile creep model based on Mooney-Rivlin equation and master curve of plural shear modulus based on WLF equation were established. BBR test results showed that addition rubber improved low temperature flexibility of REAS layer. SEM images showed more chemical crosslinking and physical tangles were formed in epoxy asphalt system after adding rubber.Secondly, pull-out test and freeze-thaw pull-out test were done to evaluate the interface bonding performance of REAS layer with the best asphalt spraying quantity of 0.7L/m2. Stripping test specially designed was carried out and anti-stripping coefficient was over 90.0%, showing better anti-stripping performance of REAS layer. Besides, water penetration test, thin plate bending test and metal coil test were done to evaluate other road service performance of REAS layer.In addition, composite beam pull-out test under the best gravel spraying quantity of 3.0kg/m2 was carried out. Test results showed that temperature and immersion had significant effects on interface bonding performance. Contrast shear test with different shear structures, different shear angles and different freeze-thaw cycles was done to evaluate the shear resistance of REAS layer. Meanwhile, the tensile strength only declined by 1.5% after rutting test, showing better high temperature stability of REAS layer.Finally, the key technology of construction for REAS layer was studied, including raw materials preparation, steel sandblasting, anti-corrosive coating, bond and gravel spraying, etc. Then, the evaluation standard of construction quality for REAS layer was put forward based on the construction guidance experience of steel deck pavement.