material is composed of fiber material and matrix material according to a
certain proportion of mixing, through a special mold extrusion, drawing
and the formation of high-performance materials.GRP:
Glassfiber Reinforced Plastics, Chinese name: fiber reinforced
composite plastic. As a result of the use of different resin varieties,
so there are polyester glass fiber reinforced plastic, epoxy glass fiber
reinforced plastic, phenolic glass steel said.Light and hard, non-conductive, high mechanical strength, recycling less, corrosion-resistant.With
the progress of social science and technology, the development of civil
engineering structure, thanks in large part to the application of new
materials and new technologies, and FRP with excellent mechanical
properties and adapting to modern engineering structuresLarge
span, towering, heavy load, light development needs, is being widely
used in bridge engineering, all kinds of civil construction, marine
engineering, underground engineering, by the structural engineering
Reform GRP has following obvious advantages due to the use of continuous improvement of the formula:
1、thermal expansion coefficient
The thermal expansion coefficient of GRP composites is similar to that of concrete, so that when the ambient temperature changes, GRP cooperates with the concrete, and there is no large temperature stress between the two.
GRP is a kind of GRP product with different strength index, elastic modulus and special performance requirement. The GRP can be designed flexibly according to the engineering needs of different materials such as fiber content and laying method.
3、light weight, high strength
Than the high strength, that is commonly referred to as light high strength, so the use of GRP material can reduce the structure of self-weight, easy construction, the weight of steel is generally 20%.
Compared with the steel, most of the FRP product elastic modulus is small. About 25% to 75% of ordinary steel bars. Therefore, the design of the FRP structure is usually controlled by deformation.
The shear strength of GRP is low, and its strength is only 5% ~ 20% of the tensile strength, which makes the GRP components need to develop special anchors and fixtures during the connection process. This also makes the modality of the GRP component become a prominent problem.
High tensile strength, GRP tensile strength were significantly higher than the steel, and high strength steel wire tensile strength is almost, usually 2 times the steel or even up to 10 times. However, the GRP material has almost no plastic deformation before the tensile strength, tensile stress, strain rose linearly until the brittle fracture, so GRP composite material in the process of interaction with the concrete structure, often not because the GRP material is But the GRP-concrete interface bonding problem has become a key and difficult problem in the future engineering application, because the interface of the concrete structure is stripped and destroyed due to the insufficient strength of the GRP-concrete interface.
GRP material corrosion resistance, fatigue resistance, and can be in acid, alkali, chlorine and wet environment for long-term use, which can improve the structure of the service life, which is difficult to match the structural materials.
8、 to facilitate the construction
Site site installation, is conducive to ensuring the quality of the project to improve labor efficiency and construction industry.
Insulation, heat and electromagnetic waves, etc., it can be used for some special occasions such as radar station geomagnetic observation station medical nuclear magnetic resonance equipment structure.
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