Carbon fiber material properties and process characteristics
一、The research on the use of carbon fiber materials for the reinforcement and repair of concrete structures began in developed countries such as the United States and Japan in the 1980s. This technology started relatively late in our country, but with the rapid development of our transportation industry, a considerable portion of existing buildings were unable to meet the increasingly heavy transportation needs due to low design standards, weak load-bearing capacity, and damage from overloaded vehicles at that time, and urgently needed maintenance and reinforcement. There are many commonly used reinforcement methods at present, and carbon fiber reinforcement is widely used. There are two main methods of carbon fiber reinforcement: carbon fiber cloth and carbon fiber board reinforcement.
卡本碳纤维布和碳纤维板是以碳纤维为原材料，经过一系列的生产工艺生产的碳纤维制品。它们的力学性能比碳纤维的力学性能还要高，是建筑加固目前所使用的主要材料。【碳纤维制品】
二、Principles of Carbon Fiber Reinforcement
The reinforcement principle of carbon fiber cloth is to prepreg carbon fibers with extremely high tensile strength into composite reinforcement materials (unidirectional continuous fibers) using epoxy resin; Apply epoxy resin adhesive along the direction of tension or perpendicular to the crack direction to the structure to be reinforced, forming a new composite. This enhances the crack or shear resistance of the structure by allowing the reinforcing adhesive material to work together with the original reinforced concrete, improving its strength, stiffness, crack resistance, and elongation. The principle of carbon fiber board reinforcement is to use a composite material made of carbon fiber and resin extruded together with a special resin for carbon fiber board, which is pasted on the surface of the component to form a new composite body. It shares the load-bearing capacity, seismic resistance, etc. with the original component, improving the strength and stiffness of the structure. 【Carbon fiber products】
三、Process characteristics
1、Lightweight (about 200g/㎡, 300g/㎡), with small thickness, able to operate in narrow spaces without increasing the structural weight and cross-sectional dimensions; The tensile strength is extremely high, 7-10 times that of steel with the same cross-section.
2、Good alkali resistance, corrosion resistance, acid resistance, earthquake resistance, and outstanding fatigue resistance.
3、Widely applicable, the substrate can be many structural building materials such as concrete, masonry structures, wood structures, etc.
4、Has flexibility, is easy to cut, and can wrap complex shaped components. Components of various shapes such as beams, columns, slabs, pipes, and walls;
5、Easy construction (without the need for large machinery and turnover materials), easy operation, and good economy;
6、Short construction period, non-toxic and environmentally friendly.
7、Long storage life and long quality assurance period.
