What are the specific advantages of aramid fibers

1. Impact resistance: The elastic modulus of aramid fiber is 125Gpa, with good ductility (elongation of 2.4%). aramid fiber first absorbs a large amount of energy through deformation, and its failure form is plastic failure. In contrast, the failure mode of carbon fiber is brittle failure. Therefore, aramid fibers are widely used in the aerospace field, military equipment, explosion-proof facilities, bridge pier reinforcement, and so on.
2. Dynamic load and fatigue resistance performance: Carbon fiber has high tensile strength, but its failure mode is brittle failure, which can only withstand long-term static load performance. And aramid fibers have unique advantages in areas where high requirements are placed on dynamic load resistance and fatigue resistance. Therefore, when carrying out structural reinforcement, attention should be paid to whether to use aramid fiber or carbon fiber for reinforcement based on the characteristics of stress distribution at the reinforcement site. Meanwhile, the shear resistance of aramid fibers is the strongest among all FRP materials, and when conducting shear reinforcement, aramid fiber composite materials should be considered.
3. Corrosion resistance: Aramid composite materials have good acid and alkali corrosion resistance. Chlorine ions in seawater have a strong corrosive effect on concrete structures, which can lead to concrete carbonation and steel reinforcement corrosion. Therefore, in some port and dock engineering structures, aramid fiber composite materials are commonly used for reinforcement and protection.
4. Non conductivity and non magnetization: Aramid fiber is a non-conductive material, so in reinforcement projects with high insulation requirements such as precision instrument rooms, hospitals, and some special industrial buildings, aramid fiber composite materials are more suitable.
5. Construction convenience: The main construction steps of aramid fiber cloth are as follows: concrete surface treatment - brushing primer - bottom impregnation resin - pasting aramid cloth - outer impregnation resin - outer protection. Compared with traditional structural reinforcement techniques such as pasting steel plates and expanding sections, FRP reinforcement technology has the advantages of convenient construction, short construction period, and no need for large construction equipment.
The reinforcement technology of aramid fiber cloth for buildings is gradually becoming popular. Currently, the commonly used reinforcement methods in China mainly include the following: fiber cloth composite material reinforcement, steel plate bonding, external prestressing, and increasing cross-section. aramid fiber composite materials have distinct characteristics and, due to their obvious cost-effectiveness advantages, are believed to be more and more widely concerned by people. They will become the most widely used new technology for strengthening building structures and other concrete structures, and can create conditions for China's civil engineering aramid fiber composite material industry to participate in international competition, with significant social and economic benefits.