GRP rebar is also called glass fiber rebar, commonly known as glass rebar or fiber rebar. GRP rebar is a material formed by high-performance fiber, synthetic resin matrix, and curing agent using an appropriate molding process; high-performance fiber is a reinforcing material, and synthetic resin is a matrix. material. Fiber has high tensile strength and is the main provider of fiber-reinforced composite material strength. It mainly bears the load and is mainly divided into carbon fiber, aramid fiber, basalt fiber, glass fiber and so on. The matrix material has the function of bonding and transmitting shear force, and its physical properties can affect the physical properties of fiber reinforced materials.

GRP rebar has high load-bearing capacity and strong tensile strength. The strength of the rod body is twice that of the same diameter threaded steel bar, but the mass is only 1/4 of the steel bar; the elastic modulus is stable, about 1/3 to 2/5 of the steel bar; Electrical insulation, thermal expansion coefficient closer to cement than steel bars, etc. It is mostly used in shield tunneling through underground diaphragm walls, column piles, and uplift piles, including the entrance and exit walls of subway station end wells. Many of them use GRP. rebar.
The performance of GRP rebar is basically similar to that of steel bars. It has good adhesion to concrete, and at the same time has high tensile strength and low shear strength. It can be easily directly cut by a composite shield machine. Will not cause abnormal damage. However, the difference between GRP rebar and steel bar is that the elastic modulus of GRP rebar is small, and it is a typical brittle material. The stress-strain curve shows an obvious linear relationship before fracture, which greatly affects the stability and stability of the GRP rebar cage during lifting. The flexural and shear bearing capacity of the GRP rebar diaphragm wall during the excavation stage of the foundation pit.
GRP rebar is non-corrosive, light in weight, strong in tensile strength, convenient to transport, and easy to operate. The disadvantage is that the bending is not strong; the steel is easy to corrode, heavy, and inconvenient to transport. The advantage is that the bending is better and the flexibility is greater. The high-strength GRP rebar produced is widely used in shield tunneling through underground diaphragm walls, column piles, and tensile piles, including the entrance and exit walls of the end wells of subway stations. In short, it can be used wherever it needs to be broken.