Study On Polymer Mortar And Concrete Anchorage Performance At The Grass-roots Level

The prestressed wire rope net with polymer mortar reinforcement technology is a new reinforcement technology in recent years, it improves the carry capacity of reinforcement concrete beam, column, slab and masonry brick wall effectively,It has good effect on the strength, stiffness and seismic performance of the strengthened members.The reinforcing material of technology is mainly high strength wire rope and polymer mortar, and they are inorganic reinforcement materials which have the characteristics of high strength, fire protection, green environmental protection. So it meet the requirements of the current state for the green building and environmental protection building very much. The prestressed wire rope net with polymer mortar surface strengthening technology have significant advantages to traditional reinforcement method of sticky steel and pasting carbon fiber cloth. The wire rope net can provide tension active, the effect is more obvious and reliable because of the application prestress to the structure, it avoid uncertainty of the above traditional reinforcement methods. However, the pre tensioning wire rope net with polymer mortar reinforcement technology has some technical problems in currently, its bond anchorage performance between polymer mortar the basic concrete is poor.When laying on the only side of the reinforcing structure, the bond anchorage performance of the two bonding surface is poor, which leads to the result strength of the high strength wire rope develop effective not yet,the reinforcement layer has been stripped. This paper is aimed at the technical problem, on the basis of the research results of bond performance between the new and old concrete, three new types of interface bond anchorage method are put forward. the bond anchorage performance of the polymer mortar and the basic concrete is discussed through the experimental and theoretical analysis,the main research contents are as follows:(1) Instroducing paper study background and the post-bond anchoring performance technology research result for different materials.(2) By comparing the experimental study and theoretical analysis of the A0, the effective bond length and bond stress of the polymer mortar in the concrete are obtained under the condition of this experiment.(3) Through experimental study and theoretical analysis on the combination which is setted anti-shear connector. The contribution rate of the bond stress and the percentage of the ultimate bearing capacity are partial to conservative calculated,and they can reach 63.1% and 37.7% respectively,the tensile properties of wire rope net can be fully used.(4) Through experimental study and theoretical analysis on polymer mortar and concrete at the grassroots level external bonded carbon fiber U-shaped hoop, The contribution rate of the bond stress and the percentage of the ultimate bearing capacity are partial to conservative calculated,and they can reach 64.4% and 43.8% respectively.(5) When setting anti-shear connector and pasting CFRP U-shaped hoop as composite reinforcement method, the bond stress of contribution rate reached 67.6%, ultimate bearing capacity increased by 48.9%,and wire rope net of limit bearing capacity is more than the tensile strength standard value.(6) Through theoretical analysis and experimental research, From the point of view of the bond anchorage bearing capacity, the potential capacity of the three kinds of reinforcement methods are compared, and the suggestion of three kinds of reinforcement methods in practical engineering application is presented..