After the precast concrete beam is completed, the uniform spraying marks include: construction unit, part name, beam body number, prefabrication time and tensioning time.

The signboard of mixing station includes: introduction signboard of mixing station, signboard of concrete mixture ratio, signboard of materials, signboard of operation instructions, signboard of fire prevention and safety warning signs.

Precast concrete refers to the concrete in which concrete products are made in the factory or site (not the final design position). Precast concrete is poured elsewhere, not at the final construction site. Precast concrete with different sizes and shapes can use fibers to enhance its reliability and toughness after cracking.

Classification:

According to apparent density:

Overweight concrete (> 2500kg/m3);

Ordinary concrete (1900

Lightweight concrete (600

According to the use: concrete for structure; Road concrete; Special concrete; Heat-resistant concrete; Acid-resistant concrete, etc.