1. Non-conductive
In modern works, such as subways, tunnels, railway electrification and industrial plants, etc., are demanding for insulation in the reinforcement of these projects, the aramid fiber has an absolute advantage, but also to these areas provide a the best choice.
2. Good corrosion resistance
Particularly resistant to alkali corrosion, other FRP composite materials can not be compared, since the structure of concrete in seawater is very corrosive, mainly because there are more reasons chlorine ions, leading to concrete carbonation, steel corrosion expansion, so in some Seaport project reinforcement and protection, the aramid fiber is the best choice.
3. Good impact resistance
Since the aramid fiber elastic modulus is 118Gpa, particularly good ductility, its extension was 1.8%, so at the beginning it was used in foreign military products, such as bullet-proof vests. It is reinforced by the impact of some of the very strict structure, such as the main channel of the piers and the like.
4. Dynamic loading good fatigue resistance
Although the tensile strength of carbon fibers is very high, but because it is a brittle material, can withstand long-term static load, if long withstand dynamic loads, it can not guarantee its strength, and aramid fibers are not subject to this limitation, early Mainly used for military products, and is the main material of body armor, because of its toughness is better, so its corresponding resistance to fatigue is very good, in addition, aramid fiber shear resistance is the strongest of all FRP materials.
5. Construction easy
Mainly the following steps, surface treatment - brushing primer - resin-impregnated layer - - Paste Kevlar cloth - the outer layer of resin-impregnated - surface protection, and the operation is very simple. Need for large lifting machinery and equipment, generally do not need to do chamfer chamfered square column 10ram just do it, because Kevlar is an organic material, and a resin infiltration is very good, and the curing time is very short general a few hours, but similar to other fibers will need one to two weeks.