Including carbon fiber reinforced CFRP and two kinds of carbon fiber reinforcement. Carbon fiber reinforced materials for the repair of concrete structures began in the 1980s the United States, Japan and other developed countries. The technology of our country started late, but with the rapid development of China's economic construction and transport, the existing building was designed as a result of a considerable part of the load caused by the low standard of historical issues, some of the buildings as a result of changes in functional use, it is difficult to meet The current specification needs to use, need for repair, reinforcement. There are many commonly used reinforcement methods, such as: increasing section method, outsourcing steel reinforcement method, bonded steel reinforcement method, carbon fiber reinforcement method. Carbon fiber reinforced structural repair technique is the second to increase the concrete sections, and a new structure after bonding steel reinforcement technology. Characteristics of carbon fiber materials to increase compared with the traditional concrete sections or bonded steel reinforced concrete, with a space-saving, simple construction, no fixed-site facilities, construction quality assurance and easy, the basic structure without increasing the size and weight, corrosion resistance, durability good. In addition, using this construction method can greatly improve the life of the building, reducing the cost of reinforcement. Therefore, carbon fiber as a reinforcing material landmark, has become widely accepted and attention. (1) high tensile strength, is 7-10 times the same cross-section steel. (2) Light weight, density is only 1/4 of ordinary steel. (3) durability, corrosion and harsh environments can impedance, climate change, chemical damage. (4) construction of convenient, time-saving section, ease of construction quality assurance. (5) for a wide range of concrete structures, steel structures, wooden structures can be reinforced. Can greatly improve the carrying capacity of components, seismic performance and durability. Scope of carbon fiber reinforced concrete structure method can be used for bending, shear reinforcement, while widely used in various industrial and civil buildings, structures shock, cracking, corrosion of reinforcement. ? Concrete structures, bridges and buildings beams, columns, panel reinforcement. ? Reinforce tunnels, harbor facilities, chimneys, warehouses, factories. ? Subject to salt damage protection and reinforced concrete structures of bridges and river. The high tensile strength of the process principle with epoxy prepreg carbon fiber reinforced composite materials become (unidirectional continuous fiber); tension direction or the direction perpendicular to the crack to be reinforced structure affixed with epoxy adhesive along on the formation of a new complex, the reinforcing material with the original RC pasted together by the force increases crack or shear capacity of the structure, improve the strength, stiffness, crack resistance and extensibility. Process process can be summarized as follows: the construction of concrete surface preparation surfaces treated surface defects brushing primer component repair CFRP configure the underlying surface maintenance leveling material or resin impregnated resin formulated a preparation operation points. A concrete surface treatment will surface incomplete concrete structures, damaged part removed. 2 pairs after tick chisel, clean-up and missing parts components exposed tendons, repair, restoration. 3 crack repair: slit width of cracks less than 0.2mm, brushing the surface with epoxy resin sealing; cracks greater than 0.2mm pouring with epoxy. 4 polished: the component surface projection (transfer of parts of concrete structures, the template then hew etc.) polished smooth surface of the component after the repair smooth as possible. 5 polished surface cleaning components, and make it fully dry. 2. Defective parts with a good brushing primer primer (adhesive), even with brushing the concrete surface at the defect site. 3. Repair with epoxy putty repair surface defects on the surface of the component surface defects face member is a very important step, points are as follows: a putty main agent, curing catalyst into the curing agent according to a predetermined ratio accurately weighed, into the container, blender and mix well. Two component epoxy putty surface depression filled with parts to repair to the surface smooth. When using epoxy putty in incomplete repair, we should at temperatures above -5 ℃, relative humidity less than 85% under the conditions of the construction. After the putty Scraping the surface remains rough bump pattern, should then sanded smooth. 4. Brushing primer with a good primer (adhesive), even with a roller brush to require bonding concrete surface. 5. Before pasting CFRP carbon fiber material, you should first confirm that the surface is dry paste. Temperature above -10 ℃, relative humidity RH> 85%, if no effective measures are not construction. To prevent damage to the carbon fiber, carbon fiber materials transportation, storage, cutting and pasting process. Application steel ruler and wallpaper knife cut the required size of carbon fiber material, each not exceeding 6m length is generally appropriate. In order to prevent material damage during storage, cutting the amount of material shall be subject to the same day the amount of the crop. Carbon fiber longitudinal lap joints must be more than 20cm. The site should be multi-coated resin, carbon fiber transverse overlap is not required. Highlights of its construction process is as follows: a paste resin main agent, curing and curing agent urged the proportion should be required to accurately weighed, into a container with a blender and mix well. Reconcile the amount of time should be used within the time runs out, whichever. 2 paste between the carbon fiber and resin try not to have air. Available roller (special tool) along the fiber direction of rolling several times on the carbon fiber material, so that the carbon fiber was immersed in the resin infiltration. 6. After curing CFRP materials, nature conservation need 1-2 hours to reach the initial curing, should ensure free from outside interference and collisions during curing. 7. If the reinforcing member needs painting fire, the fire-resistant coating can be painted after the resin is cured. After the initial resin coating should be cured, and should comply with the relevant standards and regulations used in the construction of the coating. Machinery equipment, mainly machine with wheel cutter, grinder, brush, etc., usually in 2 to 4 units can meet the engineering requirements. CFRP intensity level technical parameters Model Weight (g / m2) theoretical thickness (mm) Tensile strength (MPa) elastic modulus (GPa) Elongation (%) LQ-Ⅰ-200 high-strength grade Ⅰ 200 0.111 ≥3400 ≥240 ≥1.7 LQ-Ⅰ-300 high-strength grade Ⅰ 300 0.167 ≥3400 ≥240 ≥1.7 LQ-Ⅱ-200 high-strength grade Ⅱ 200 0.111 ≥3000 ≥210 ≥1.5 LQ-Ⅱ-300 high-strength grade Ⅱ 300 0.167 ≥3000 ≥210 Carbon fiber reinforced concrete cracks ≥1.5 technology for independence through the crack width is greater than 0.2mm, the use of pressure perfusion structural adhesive reinforcement method, while the tension along the vertical direction or the direction of CFRP in the cracks in the reinforced structure to be formed A new complex, the reinforcing material with the original RC pasted together by the force increases crack or shear capacity of the structure, improve the strength, stiffness, crack resistance and extensibility. Commonly used in the foundation repair-beam can withstand 136 ~ 181kN tension, to avoid bending the wall, and 10cm wide carbon-fiber strips acceptable 8-10 times this pressure, so long as its thickness 3.2mm. Housing repair cracks in carbon fiber has the following advantages a, light weight, thin, and does not substantially increase the weight of the structure cross-sectional dimension. b, broad applicability, flexibility, structural elements can be used in all types and shapes of reinforcement. c, fast and convenient construction, no large-scale equipment, no wet work, no flare, no other fixed measures from the original structure and shape restrictions. d, high durability, due to not rust, ideal for use in high-acid, alkali, salt and atmospheric corrosion in a bad environment.