Application of Basalt Fiber Reinforcing Bar in Construction Engineering

 Application of basalt fiber rebar in construction engineering, and comparison of rebar

1. Physical properties of basalt fiber composite bars

1. Density: The density of fiber composite bars is between 1.9-2.1g/cm³, which is only 1/4 of that of steel bars.

2. Thermal expansion coefficient: The longitudinal and lateral thermal expansion coefficients of fiber-reinforced composite bars are different, mainly depending on the type of fiber, resin and fiber volume ratio. The longitudinal coefficient of thermal expansion is affected by the fiber properties, while the transverse coefficient is mainly affected by the resin. The table below lists the transverse and longitudinal coefficients of thermal expansion of steel bars and different types of fiber composite bars.

2. Application of Basalt Fiber Reinforcing Bar in engineering

2.1 Application of underground engineering

Underground engineering refers to: underground parking lots, underground pedestrian passages, subway stations, tunnels, underground sports venues and other places have higher requirements on the strength of buildings than general buildings. The tensile strength and elastic modulus of black Basalt fiber rebars are superior to those of steel bars, making them the best choice for reinforcement of underground engineering. At the same time, they are also widely used in tunnel concrete reinforcement and underground oil storage facilities.

2.2 Application of anti-corrosion buildings

Due to its good chemical corrosion resistance and high durability, Xuan fiber composite bars can be used in concrete bridge structures, concrete roads, seaport terminals, lighthouses, swimming pools, petrochemical equipment plants, sewage treatment plants, nuclear power equipment, nitrogen tanks, etc. application in buildings. The corrosion resistance of black fiber composite bars can resist a large number of industrial nitrates scattered on concrete bridges and highway pavements to prevent freezing in winter, reduce or avoid erosion of concrete, reduce maintenance costs and prolong service life.

2.3 Construction projects with low electrical conductivity and non-magnetic requirements

The good electromagnetic wave permeability and electrical insulation properties of Xuan fiber composite bars make it suitable for sensitive electronic communication equipment buildings such as electronic equipment factories, communication buildings, airports, maglev trains, electrical signal towers, and earthquake prediction stations. The use of basalt composite bars can also prevent the occurrence of electric shock accidents in buildings due to current induction or leakage.

At present, the price of steel bars is about 3,500-4,000 yuan/ton (the price from the network), and the price of Fiber Rebars (take 6mm as an example) is about 40,000 yuan/ton (estimated price). It is much higher than the steel bar, but because the black fiber composite bar is lighter (density 2g/cm³), and the density of the steel bar is heavier (density 7.85 g/cm³), the length of the black fiber composite bar under the weight is nearly 4% of the steel bar. Double length; the performance comparison between black fiber composite bars and steel bars has been described above, and it has great advantages for some construction projects (the previous article has described the use of black fiber composite bars and black fiber chopped strands on highways) ). At present, many highways and bridges in China have used black fiber composite bars, which are more suitable for concrete and have better corrosion resistance (domestic manufacturers soaked black fiber composite bars in seawater for one year to test their mechanical properties. , basically no change), good tensile and compressive strength.

From the comprehensive point of view of construction, application, maintenance and life cycle of construction projects, it is a common practice in current construction projects to alternately bind or lay black fiber composite bars and steel bars, but some domestic highways or expressways all use composite bars. Paved, the pavement effect is very good.