| Epoxy-rich zinc paint has strong adhesion to steel bridge deck and good corrosion resistance,and has been widely used in steel bridge deck pavement.Due to the complicated force of the orthotropic steel bridge deck structure,combined with the conditions of overload and heavy load and high temperature and rain,the steel bridge deck pavement engineering has many damages early,and the pavement has delamination,displacement,cracking and other diseases,preventing bridge deck paving.The delamination between the steel and the bridge deck is a key technical requirement for steel deck pavement.The steel bridge deck sandblasting and rust removal construction process,epoxy zinc-rich lacquer material performance evaluation and steel structure anti-corrosion coating have been deeply studied,but for steel bridge panel roughness and epoxy zinc-rich paint film The lack of systematic study on the effect of thickness combination on corrosion resistance and bonding performance.Epoxy zinc-rich paint is generally used as an anticorrosive primer.In the steel bridge deck,the epoxy zinc-rich paint is usually exposed to the natural environment for a period of time after spraying.The epoxy zinc-rich paint coating is exposed in the natural environment.The impact of steel bridge deck pavement durability is not clear and systematic evaluation is necessary.The stress state of steel bridge deck anti-corrosion coating is different from the simple anti-corrosion coating of general steel structure.The steel bridge surface epoxy zinc-rich paint is used as part of the paving system to withstand the comprehensive effects of vehicle wheel load,and epoxy zinc-rich paint is paved.During the concrete compaction process,the aggregate extrusion and friction are also affected.The influence of the mixture temperature on the anti-corrosion coating of the epoxy-rich zinc-rich paint needs further evaluation.Combining these factors,the factors affecting the anti-corrosion system of the epoxy asphalt pavement are evaluated.And composition.The following experimental research was carried out on the application technology of steel bridge deck epoxy zinc-rich paint and anti-corrosion system.(1)According to the performance requirements of steel bridge deck epoxy zinc-rich paint anti-corrosion layer,combined with the common structure of steel bridge deck pavement and paving common diseases,the performance requirements and evaluation methods of epoxy zinc-rich paint anti-corrosion layer are analyzed.(2)The conditions for the use of the anti-corrosion layer of the epoxy steel zinc-rich paint on the steel bridge deck,the presence or absence of epoxy zinc-rich paint,interlayer adhesion properties,salt water corrosion resistance,impact resistance and heat resistance,Evaluate the functional role of epoxy zinc-rich paint coating in steel bridge deck pavement systems.The results show that the pavement concrete void ratio is more than 6%.Under the salt water corrosion condition,the surface of the steel sheet without epoxy zinc-rich paint anti-corrosion layer appears to be rusted overall,and the epoxy zinc-rich paint anti-corrosion layer can effectively improve the steel bridge deck pavement.Body durability.It also reflects that the epoxy asphalt steel bridge deck pavement anti-corrosion system consists of epoxy zinc-rich paint,waterproof adhesive layer and pavement layer,and an integrated anti-corrosion system should be constructed.(3)Evaluate the influence of the combination of the roughness of the steel plate and the thickness of the paint film on the bond strength of the epoxy-rich zinc paint,the bond strength of the waterproof adhesive layer,and the corrosion resistance of the steel plate.The results show that when the roughness of the steel plate is 120-140?m and the thickness of the paint film is 80-110?m,the bond performance and corrosion resistance of the steel bridge surface epoxy zinc-rich paint layer are superior.(4)Evaluate the influence of exposure on the bonding performance of the epoxy-rich zinc-rich paint coating,the anti-corrosion performance of the steel plate and the overall performance of the pavement layer.The results show that the bond strength of the waterproof adhesive layer will be significantly reduced after the steel bridge deck epoxy zinc-rich paint coating is exposed to the natural environment for more than 60 days.It is recommended that the steel bridge deck epoxy zinc-rich paint coating is applied in nature.Keep the placement time as short as possible in the environment,and should not exceed 60 days.(5)Based on the steel bridge deck pavement of Humen Second Bridge,comprehensive evaluation of the performance of epoxy zinc-rich paint by three stages of performance comparison,basic performance evaluation and road performance verification of epoxy zinc-rich paint materials,according to experimental research results The epoxy zinc-rich paint scheme for the steel bridge deck of Humen Second Bridge was determined,and the key points of the quality control of the epoxy-rich zinc paint construction of Humen Second Bridge were analyzed.Through the systematic research on steel bridge surface epoxy zinc-rich paint,the main functions of epoxy zinc-rich paint anti-corrosion layer were revealed,the calibration method for determining the film thickness of epoxy zinc-rich paint layer,and the steel bridge surface roughness and epoxy were mastered.The optimal combination range of zinc-rich paint film thickness was analyzed.The composition of epoxy asphalt steel bridge deck pavement anti-corrosion system was analyzed.The influencing factors of weathering time of epoxy zinc-rich paint construction,cleaning treatment method and allowable time limit were determined.The research results have been applied in the practice of Humen Second Bridge Project,which can provide reference for the design and construction of epoxy asphalt steel bridge deck pavement. |
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