CFRP construction: 13917130703 Chen Gong CFRP construction program CFRP technology in national rules first adopted in 2003, "carbon fiber sheets technical specification for strengthening concrete structures", the number of CECS146: 2003, now has been the latest country Standard Specification for "reinforced concrete structure design specifications" instead, its number is GB 50367-2006. I. Introduction of 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, steel stick after a new type of structure reinforcement technology, hailed: reinforcing the new fighter. Second, the characteristics of carbon fiber to increase compared with 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 performance characteristics. 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. Purpose? 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. Third, the scope of application of carbon fiber reinforced carbon fiber reinforced concrete construction method can be used to bending and shear reinforcement, while widely used in various industrial and civil buildings, structures shock, cracking, corrosion of reinforcement. Fourth, the process principle the high tensile strength carbon fiber reinforced epoxy prepreg composite materials become (unidirectional continuous fiber); tension direction or the direction perpendicular to the cracks with epoxy adhesive paste to be reinforced along on the structure, 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. Fifth, the process and the process operating points can be summarized as follows: put the facility construction preparation → → base station line treatment → brushing paint primer putty → → → Paste CFRP carbon fiber surface maintenance → brushing special glue. 1. 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. Six, material meets the national standard GB50367-2006 provides carbon fiber reinforced materials are: 1) unidirectional carbon fiber cloth fabric composite material, 200 g, 250 g, 300 g, and carbon fiber strip plate 2) S glass cloth, (basalt cloth), unidirectional fabric (cloth) composite material, 300 grams --450 g 3) E unidirectional glass fiber fabric (cloth) 300 grams --450 g 4) modified epoxy resin, carbon fiber cloth for attaching fiber reinforced material is a high strength carbon fibers arranged in one direction, with a trace amount of the resin impregnated reinforcing material after a repair concrete, the tensile strength of steel is about 10 times, and has a light weight, high elasticity, high strength, high durability and other characteristics . The most commonly used carbon fiber reinforced materials are made in Shanghai with concrete, solid amber amber Shenzhen, Beijing 703 imported Japanese Toray, Taiwan-billion US Hexcel Hexcel, Nippon Oil and other seven, machinery equipment, mainly with a grinding wheel cutting machine machine, grinder, brush, etc., usually in 2 to 4 units can meet the engineering requirements. Eight per 100 square meters area labor organization of carbon fiber reinforced arrange four skilled workers, six general workers. CFRP construction by construction technology with excellent professional construction team to complete and should careful organization and construction. Nine, quality requirements 1. All admission materials, including carbon fiber material and adhesive material must meet quality standards, and has shipped product certification, reinforcing compliance with engineering design requirements. 2. Carbon fiber material in the transport, storage shall not be crushed, so as not to damage the carbon fiber, nor the direct sun and rain, cement materials should be stored cool and sealed. 3. Construction quality of the process, by the technical staff responsible for directing, supervising, after the process is completed every draw technician examination, approval, before the next procedure. 4. Tu brushing primer paint should be uniform, not holidays, is strictly prohibited under the temperature conditions are not suitable for construction, adding solvent diluted paint should be used within a specified time. Temperatures below 7 ℃, relative humidity RH <85%, the concrete surface moisture content below 8%, while non-condensing, you must use a modified epoxy resin. 5. The surface of the component surface structures incomplete repair holes, inside corners flat with epoxy putty repair, after scraping putty, there are still uneven surface roughening, should then sandpaper. 6. Paste the carbon fiber ① must comply with carbon fiber material when the following conditions: a, should be required to cut the carbon fiber material. b, air temperature, air humidity, moisture and other surface components meet the requirements. c, primer and putty reach Tack (resin surface reaches cure induration). d, the type of binder resin and suitable temperature during the construction, the main agent and curing agent, curing accelerator should be required proportion of accurate weighing, loading container, stir with a stirrer, a reconciling amount should be within the specified time run out. ② quality inspection standard carbon fiber paste. a, under coated and painted carbon fiber bundle immersed good penetration. b, a carbon fiber bonded tightly. c, the diameter of 10mm hollowing less than 30mm, less than 10 per square meter can be considered qualified; if more than 10 per square meter, is considered unacceptable, the need for the conversion. For hollowing diameter of 30mm or more, and as long as there, that is considered substandard, the need for the conversion. d, along the fiber direction lap length of not less than 20cm, the overlap between the layers of the site shall be located on the same straight line, to be staggered between layers of at least 50cm. e, the carbon fiber material specifications, pasting location, length, width, fiber orientation, layers compliance. 7. Technical Standard: "carbon fiber sheet reinforced concrete structures Technical Specification" CECS146: 2003. X. benefit analysis of carbon fiber reinforcement, as long as the design is reasonable, and the general pasted plate method is more cost about the same, but the carbon fiber reinforcement construction method is convenient, high efficiency, no wet work, without fixed-site facilities, construction occupies less space in the construction period, terms of construction conditions has obvious advantages. Carbon fiber reinforcement Reinforcement effect, high strength and efficient, wide application, easy to guarantee the quality, excellent corrosion resistance and durability. After the use of carbon fiber reinforced repair, substantially increasing the weight of the original structure and the size of the original components. Carbon fiber reinforced with a lightweight, high strength, corrosion resistance, aging resistance, durability, stability and other physical properties of many other advantages. Its tensile strength is 7-10 times of equivalent cross-section steel. Carbon fiber reinforced concrete structure reinforcement materials to repair the recent development from the new labor law, and the concrete structure is integrally formed to work together to enhance the use of carbon fiber components excellent tensile strength and stiffness to achieve the purpose of carrying capacity. This technology has a simple construction, fast, safe, reliable, durable, able to adapt to a variety of complex structures shape, does not affect the appearance of the original structure and many other advantages. Repaired reinforcement project has been widely used in concrete seismic.