Application of Basalt Fiber Unidirectional Fabric in Structural Reinforcement Works

Superior comprehensive performance:
Basalt fiber has superior physical properties, good adhesion, heat resistance and corrosion resistance, etc., very suitable for civil engineering field.
Basalt fiber unidirectional cloth not only has high tensile strength, but also has good high elongation (3.1%). It can absorb a lot of energy through spontaneous deformation when it is destroyed under the limit state, so it has unique and excellent performance for seismic reinforcement. Basalt fiber unidirectional cloth is a non-conductive insulating material. In subway tunnels, electrified railroads and some anti-magnetization, electrical insulation, anti-magnetic performance of the building reinforcement project, basalt fiber unidirectional cloth has very obvious advantages. Plus basalt fiber unidirectional cloth in the reinforcement project construction is also very convenient, and adhesive combination is better, the resin impregnation permeability are higher than the carbon fiber, so as to improve the building structure of the resistance to movement load capacity and impact resistance, suitable for reinforcing bridges, mounds, columns, beams and other parts of the bridge.

Technical performance:
1. Impact resistance: continuous basalt fiber tensile strength of 4100 ~ 4800MPa, modulus of elasticity of 90 ~ 110GPa, ultimate elongation of 3.1% (carbon fiber 1.7%, spunlaced 2.4%), in the limit of gravity, the basalt fiber material is the first to absorb a large amount of energy through the deformation, which is one of the properties required in the building reinforcement project. Therefore, basalt fiber is widely used in military equipment, explosion-proof facilities, bridge pier reinforcement project.
2. Dynamic load fatigue resistance: Although the carbon fiber tensile strength is high, has a good withstand long-term performance of the surface load, but in the ultimate state of stress carbon fiber for brittle damage, dynamic load resistance, fatigue resistance is not as good as the basalt fiber, so in the structural reinforcement, especially bridge reinforcement, anti-seismic reinforcement. Need to use different materials in different parts, some should use carbon fiber, some should use basalt fiber.
3. Acid resistance, alkali resistance, chemical resistance: basalt fiber composite material has good acid resistance and alkali resistance, in 1000C in Ca (OH) 2 saturated solution impregnated for 4 hours, the monofilament strength retention rate is greater than 75.8% or more, resistance to strong alkali, acid resistance is good. Due to the chlorine ions of seawater on the seashore, seaport terminal concrete structure has a strong chemical corrosion, can lead to carbonization of concrete, corrosion of reinforcing steel, so the use of basalt fiber composite tendons, unidirectional cloth for reinforcement can achieve better results.
4. Good electrical insulation properties: Basalt fiber insulation is better than alkali glass fiber, carbon fiber is a conductor of electricity, so in the subway project, tunnel project, electrified railroad project, industrial plant, insulation requirements of high buildings, the use of basalt fiber reinforcement can eliminate shielding phenomenon.

Cost advantage:
Basalt fiber unidirectional cloth in the structural reinforcement in the use of performance partially meets or exceeds the case of carbon fiber, per square meter basalt fiber unidirectional cloth cost is the latter's 1/4-1/3, is the most reasonable low-cost alternative to carbon fiber unidirectional cloth.