Method for reinforcing concrete structural part through fiber grid ribs and early-strength self-compacting mortar

Abstract

The invention relates to a method for reinforcing a concrete structural part through fiber grid ribs and early-strength self-compacting mortar. The method comprises the following steps of firstly removing floating dust and loose particles on the surface of the reinforced concrete structural part, then carrying out notching processing, and then removing concrete dust and wetting; then smearing or spraying the early-strength self-compacting mortar which is stirred in advance on the surface of the processed concrete structural part, wherein the thickness of the early-strength self-compacting mortar is higher than the surface of the processed concrete structural part; then laying the fiber grid ribs on the early-strength self-compacting mortar; and finally smearing or spraying the early-strength self-compacting mortar which is stirred in advance on the surfaces of the fiber grid ribs to guarantee that the early-strength self-compacting mortar uniformly covers the fiber grid ribs and exceeds the height of the fiber grid ribs. According to the construction process of the invention, the crack distribution of the concrete structural part is effectively improved, the crack propagation of the concrete structural part is effectively controlled, the structural rigidity, the bearing capacity and the durability are improved, and the method can be widely used for the anti-bending, anti-shearing, anti-pressing and anti-seismic reinforcing of concrete structures in various types.

Description

technical field [0001] The invention belongs to the field of building structure reinforcement, and relates to a method for reinforcing concrete structural parts with fiber grid bars and early-strength self-compacting mortar. Background technique [0002] In 1999, the German Research Association proposed fiber woven mesh reinforced concrete (Textile Reinforced Concrete, referred to as TRC) to strengthen concrete structures. TRC is a combination of multiaxial fiber braided mesh and fine concrete. The fiber braided mesh is mainly made of carbon fiber and alkali-resistant glass fiber. Fine concrete is concrete with a small aggregate particle size, mainly made of cement, silica fume, fly ash and sand. Material composition with good flow, penetration, bonding, water retention and durability. However, the research institution itself also pointed out that under a certain stress state, because the interface shear stress between the TRC reinforcement layer and the original component ...

AI Technical Summary

Problems solved by technology

The initial setting time of the fast-setting composite mortar of this method is less than 3 minutes, and the time available for construction operation is too short, requiring a special mixing and spraying device, and the construction conditions are harsh

In addition, this patent uses fiber braided mesh as reinforcement, which can only be applied to the flexural reinforcement of concrete structures. At the same time, the fiber filaments may slip during application, resulting in insufficient use of the high-strength properties of the fiber.