Research On Restoration Technology Of Active Control Of Cracks In Concrete PC Beam Bridge

PC girder bridge as one of the most common type of bridge in the world, and as an important transport hub is important for social services. And concrete is an important basic material in PC girder bridge, the concrete has many advantages, such as the compressive performance of strong, durable performance is good, and so on.But as time went on, PC girder bridge due to the load or aging, the cracks of the concrete also gradually. At present, the bridge engineering science and technology research more passive reinforcement for bridge maintenance, active repair technology of Bridges. Large-span prestressed concrete(PC) continuous rigid frame bridge and medium and small span of simply supported continuous accounted for the vast majority of the highway bridge, the maintenance and management technology to them to ascend, will greatly reduce the direct economic loss brought by the traffic control.PC girder bridge concrete crack self-healing mechanism study is particularly urgent,by has the memory function of intelligent materials active self-healing mechanism was studied for the micro cracks of concrete exploration, put forward the concrete bridge structure layer crack self-healing theory of the preparation technology and design, can improve the working performance of the structure of the bridge and prolong the service life of the bridge. This article for active control of PC girder crack repair done experiment study, the paper work is as followsâ‘ In the first place in the study based on a large number of literature at home and abroad, found the industrial paraffin its good properties can be used as a restorative materials. And through its normal paraffin for phase transition of melting point,thermal conductivity performance, waterproof performance, flow and solid made a series of modified test case its toughness. The nature of the test to use a series of union and physical integration, modified gel with the ideal of concrete crack repair;â‘¡ According to the standard design of C50 concrete used for the test, it is concluded that the C50 concrete mixture ratio. According to the design of production and maintenance test specimen. For the heating mode to do the contrast test, through contrast experiment it is concluded that the more good heating method has laid a good groundwork for future analysis and foundation.â‘¢On the basis of material modification of test, the modified paraffin wax and combined with concrete, through the contrast test twice, the first test based on theanalysis of the modified paraffin wax with normal paraffin in the crack repair effect of initial and subsequent lasting effect, through the crack repair rate, and concluded that the thickness of materials to repair the optimal scheme, the optimal solution in the modified paraffin repair rate reached 25%, than normal paraffin repair increased by almost 15%. The second experiment, the design of several new type of composite slab structure mode, through the new type of composite structure model to improve the ability of concrete to prevent cracking. It is concluded that an optimal solution from the aspects of anti cracking. New composite structure model for fracture repair,through comparison of its optimal solutions and prevent cracking of the same. By comparing the experiment proved that the new type of composite structure repair effect reached 31.6%, higher than that of without bond normal paraffin composite structure components of 21%, higher than that of without bond portfolio components modified paraffin by 9%.