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Application of glass fiber composite materials in construction
August 30, 2022
The chemical composition of glass fiber is mainly silicon dioxide and boron trioxide, which play a decisive role in the properties and process characteristics of glass fiber. Glass fibra has many excellent properties such as high strength, low expansion, corrosion resistance, electrical insulation, and non-combustion. The glass of specific components is melted and flowed out through small holes, and then drawn into very fine fibers, which can be made into fabrics with a wide variety. There are often glass fiber cloth, glass fiber mat and non-woven fabric.
The strength, stiffness and fatigue resistance of short fiber reinforced composites are far inferior to the performance of similar long fiber reinforced composites in the fiber direction. However, due to the high productivity of short fibers, complex-shaped parts can be made and the price is cheap, so it has a wide range of applications. Chopped glass mats have good layability, no orientation, and reinforced composites are much better in strength, especially stiffness and thermal stability than matrix materials (engineering plastics) without fiber reinforcement; than unidirectional continuous fiber reinforced composites The transverse tensile and shear strengths are much higher; much higher than the interlaminar tensile and shear strengths of unidirectional (and laminated) composites.
Fiberglass cloth is a fiber cloth made of crude fibers woven in a certain direction. The reinforcement of glass fiber cloth is to paste or wrap FRP cloth on the surface of the solid member to improve the bearing capacity and resistance to damage of the reinforcing member. Depending on the requirements of the reinforcing member, horizontal, vertical, full, or spaced pasting can be performed, and the FRP cloth can be wrapped around the surface of the member for reinforcement. This reinforcement method has its own advantages and is a reinforcement method that the academic and engineering circles want to widely promote and apply.
FRP sheet is formed by extruding resin and fiber glass direct roving by high temperature curing according to a certain proportion, including FRP sheet and FRP slat. This kind of reinforcement method is generally to embed or stick the direct roving for FRP board or slat on the part that needs to be reinforced. , to achieve the purpose of reinforcement, FRP sheet can be used in beam reinforcement and shear reinforcement. However, it has its limitations and is rarely used in the reinforcement of engineering structures
FRP profiles are made of fibers and resins in a certain proportion by pultrusion or winding process. FRP profiles can be divided into I-shaped, L-shaped, grooved, circular and rectangular according to the cross-sectional form. The production process of such profiles is relatively complicated, and it is generally used in the reinforcement of some special components.
FRP bar reinforcement
FRP bars can be divided into FRP bars and FRP grids. FRP bars and FRP grids can replace steel bars in concrete members, or can be reinforced outside the members as compressive and shear-resistant reinforcing materials.
Fiberglass staple fiber is chopped from electric fiber filaments, and its basic properties mainly depend on the properties of the fiber filaments. For longer filaments, the chopped glass fibers for concrete have the advantages of uniform dispersion, various feeding methods and simple processes. Adding it to concrete or mortar can effectively prevent micro-cracks caused by plastic shrinkage, dry shrinkage, temperature and other factors of concrete (mortar), inhibit the development of cracks, and greatly improve the crack resistance, impermeability and impact resistance of concrete. It can be widely used in underground engineering, industrial and civil construction engineering, road and bridge engineering for reinforcement.