First, the characteristics of high-strength carbon fiber materials
Carbon fiber is a new type of nonmetallic material made of organic matrix fiber (such as viscose silk, polyacrylonitrile or asphalt) using high temperature decomposition method to remove all the elements other than carbon under an inert gas at a high temperature of 1000 to 3000 degrees. It is resistant to corrosion, abrasion resistance, dimensional stability, conductive, thermal conductivity, small thermal expansion coefficient, self-lubricating and energy-absorbing than stainless steel. Seismic and a series of excellent performance. Another important feature is the smaller proportion. The proportion is generally around 1.6, is one-half of aluminum, steel one-fifth. Although the carbon fiber is light in weight, it is high in strength and has a high "specific strength" (strength = material strength limit / unit weight of the material), and carbon fiber with excellent fineness (one of the 9 meters The number of grams of long fibers), generally only about 19 grams; pull up to 300KG / MM2; almost no other materials like carbon fiber as so much excellent valuable electrical, thermal and mechanical properties.
Second, high-strength carbon fiber materials in the production and use of life
Carbon fiber material has such a magical performance, of course, is widely used in various fields.
Carbon fiber and plastic made of composite materials made of light aircraft, and consumption of less power, thrust, noise; with carbon fiber reinforced plastic to create satellite and rocket and other space vehicles, high mechanical strength, low quality, can save a lot of Fuel; the use of carbon fiber electronic computer disk, can improve the computer's storage capacity and computing speed; in sports equipment applications mainly for the production of golf clubs, tennis racket, racing, bows and arrows, jump pole, ice hockey, yacht, Gliders, manned aircraft, sailing masts, motorcycles and mountaineering supplies such as mountaineering sticks, ski poles, rock climbing helmets and so on.
Carbon fiber using its unique mechanical properties, widely used in aviation, aerospace, military, sports and leisure and other structural materials; the use of its vibration attenuation, used in audio equipment; use of its fatigue resistance, used in helicopter blades; High temperature resistance, used in aircraft brake pads and insulation materials; the use of its dimensional stability, used in the universe machinery, radio telescopes and a variety of molded products; use of its chemical resistance, used in sealing filler and filter; Characteristics, used in electrode materials, electromagnetic shielding materials, anti-static materials; use of its physical adaptability, used in artificial bone, ligament; use of its X-ray transmittance, used in X-bed.
Third, the use of carbon fiber materials in structural reinforcement
The use of carbon fiber material as the main raw material of carbon fiber structure reinforcement technology is a new type of reinforcement technology. Began in the 20th century, 80 years, the United States, Japan and other developed countries, China started late, the development of faster, the construction area from the late 1980s began to use it as reinforced, prestressed concrete steel alternative materials to study, and as a prestressed concrete The tensile material of the bridge, the external wall material of the building, the reinforcement material of the existing structure, and so on, have produced great economic benefits.
(A) carbon fiber material structure reinforcement Scope Carbon fiber materials for a variety of structural types, various structural parts of the reinforcement repair, such as beams, plates, columns, roof trusses, piers, bridges, chimneys, cylinder, shell and other structures; , Some of the mechanical properties of brick masonry can also be reinforced with carbon fiber.
Specifically, but not limited to: the use of carbon fiber reinforced road bridge and bridge structure, the existing reinforced concrete chimney reinforcement; component bending reinforcement, beam and column components of the shear reinforcement, concrete column legs fracture reinforcement, masonry seismic Reinforcement, lack of bearing capacity, reinforcement of building reinforcement, frame column pressure ratio overrun reinforcement, floor cracking reinforcement, shear wall reinforcement, floor load reinforcement, bridge fracture, old bridge overhaul reinforcement and water tower reinforcement Wait.
(B) of the carbon fiber structure of the technical characteristics of the construction process of carbon fiber with a small proportion of small, easy construction, reinforcement does not affect the appearance and weight. Carbon fiber only the proportion of steel 1/4, the thickness of less than 0.5mm, you can not increase the original structure of the weight and cross-sectional size of the situation, play a strong reinforcement effect. Enhance the comprehensive, durable performance, there are excellent anti-ultraviolet and anti-aging performance.
(C) carbon fiber sheet reinforcement concrete structure specification When using carbon fiber sheet to reinforce the concrete structure, the carbon fiber sheet should be attached to the surface of the ten component by supporting the adhesive material, so that the carbon fiber sheet is subjected to tension and coordinated with the concrete deformation Force.
(4) Carbon fiber sheet The concrete structural member can be reinforced in the following way: the carbon fiber sheet is affixed to the tension zone of the beam and the plate member, and the fiber direction is consistent with the tensile direction of the reinforcement; , The U-shaped paste or the side of the beam on the beam, the column members of the shear reinforcement, the fiber direction should be perpendicular to the axial components; the use of closed paste on the column for seismic reinforcement, fiber direction and column axial vertical; when there is a reliable basis, Carbon fiber sheet can also be used in other forms and other stress conditions of the concrete structure of the reinforcement; the use of carbon fiber sheet paste concrete structure, should be based on the current national standards using probability theory based on the limit state design method Carrying capacity The calculation of the limit state and the normal use of the limit state check; reinforced and concrete materials, according to the actual strength of the test, according to the current national standards to determine the corresponding material strength design indicators; carbon fiber sheet should be based on components to limit the strain, Linear elastic stress-strain relationship to determine the corresponding stress; carbon fiber sheet should be provided by the production plant to provide not less than 95% guarantee the ultimate tensile strength as the tensile strength standard value; when the use of adhesive carbon fiber sheet on the structure or component reinforcement , The effect of reinforcement on other properties of other components or components in the structure should be taken into account. When the structural reinforcement is carried out using the carbon fiber sheet, it is desirable to remove the live load acting on the structure. If the reinforcement can not be carried out under complete unloading conditions, the influence of the secondary force should be taken into account. When the bending reinforcement and the shear reinforcement, the actual concrete strength grade of the reinforced concrete structure and the structure shall not be lower than Cl5. When the concrete is reinforced with the sheet, the concrete strength grade shall not be lower than C10.