GRP is the abbreviation of Glass Fiber Reinforced plastics, which generally refers to glass fiber reinforced unsaturated polyester, epoxy resin and phenolic resin matrix. Reinforced plastics with glass fiber or its products as reinforcing materials are called glass fiber reinforced plastics, or FRP. GRP has the main characteristics of light weight and high strength. Generally speaking, its heat resistance, corrosion resistance and electrical insulation are good, but its rigidity is poor, not as good as metal, and its creep and other deformations are large.

Due to the different types of resins used, there are polyester FRP, epoxy FRP, phenolic FRP, which can be used to replace steel to manufacture machine parts and automobile and ship shells.

There are usually two ways to connect GRP, namely mechanical connection and adhesive connection. Adhesive connection is to use adhesives to bond the materials to be connected together; mechanical connection refers to riveting, bolting and pinning.

Benchmark points

In the high-speed railway track measurement, the application of GRP points on CRTS I type plates is an improved construction plan based on the advantages of CRTS I type plates and CRTS II type plates. This measurement method not only ensures the accuracy of construction measurement, but also improves the construction progress. Therefore, the measurement and setting of GRP points directly affects the accuracy and quality of the track plate after laying.

The fine adjustment of the track plate of the Shanghai-Nanjing Intercity Railway combines the advantages of CRTS I type plates and CRTS II type plates, and proposes a measurement method using a fine adjustment frame and GRP points. The total station is built on two GRPs with known points. After measuring the prism placed on the fine adjustment frame of the bolt hole on the CRTS¢ñ type plate, the measured three-dimensional coordinates of the position of the prism can be measured. According to the coordinates, its mileage in the line can be determined. After the mileage calculation of the software, the theoretical three-dimensional coordinates of the place are obtained. The software calculates the deviation between the measured and theoretical coordinates, displays the deviation value on the display, and adjusts the CRTS¢ñ type plate according to the deviation. To ensure the measurement accuracy, the left and right lines should be adjusted separately. This measurement method not only ensures the accuracy of construction measurement and improves the construction progress, but also retains the on-site measurement results, providing an effective basis for post-processing data inspection, analysis and report generation.

Remuneration Certification

Global Remuneration Professional is a research course on human resources professional remuneration management with overall remuneration as the core, and it is also the only globally universal remuneration professional management certification in the human resources industry. The recipients of this certificate are all top experts in C&B in the international human resources industry. To obtain this certification, they must pass the rigorous tests of 8 global unified examinations organized by the World Remuneration Association. The test includes in-depth research and exploration of the current human resources market environment and future development directions. This certification is also called the "ACA" of the human resources industry by industry insiders.

Glass Plastic

FRP: Fiberglass Reinforce plastic, also written as GRP, Chinese name: glass reinforced thermosetting plastic or glass steel. It is a composite material consisting of a matrix and a reinforcement. The matrix of GRP material is resin, which plays a bonding role and accounts for 30%~40% of the total volume. Resin is a thermosetting plastic, including epoxy (EP), phenolic resin (PF), etc. Resin is also an organic non-metallic material. The reinforcement of GRP material is glass fiber, which plays a reinforcing role. Glass fiber is an inorganic non-metallic man-made inorganic fiber, such as glass fiber, carbon fiber, Kevlar fiber B, etc., which roughly accounts for 60%~70% of the total volume. Therefore, GRP is a plastic-based composite material composed of organic non-metal and inorganic non-metal.

GRP has good electrical insulation and bonding properties, high mechanical strength and heat resistance, weavability, resistance to general acids and alkalis and organic solvents, and resistance to mold. The molding shrinkage is small, and the volume shrinkage is 1%~5%. After adding the curing agent, it must be pressurized and heated for molding, and it can also be cured at room temperature under contact pressure.

All countertops at Capital Airport and Tianjin Airport are made of this material.

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