Introduction of plastic template characteristics and comparison of advantages and disadvantages

What is a plastic template?

The plastic template is a composite material that is extruded through high temperature 200 ° C on the basis of digesting and absorbing European advanced equipment manufacturing technology and half-high processing experience based on advanced products and process technology. Plastic formwork is an energy-saving and green product. It is another new generation product after wood formwork, combined steel formwork, bamboo and wood veneer formwork and all-steel large formwork. According to the material can be divided into: polyvinyl chloride (PVC), polypropylene (PP), polyethylene (PE), polycarbonate (PC), acrylonitrile butadiene styrene (aBS), high density polyethylene ( HDPE) can be divided according to the appearance: solid board, hollow board, snap rib board, module assembly board, plastic square wood, plastic yin and yang angle

Plastic template advantages

(1) Smooth and smooth. The splicing of the stencil is tight and flat. After the demoulding, the surface degree and smoothness of the concrete structure exceed the technical requirements of the existing water stencil, no need for secondary plastering, saving labor and materials.

(2) Light and easy to install. Light weight, strong process adaptability, can be sawed, planed, drilled, nailed, can be freely composed of any geometric shape, to meet the needs of various shapes of building support

(3) Demoulding is simple. Concrete does not stick to the surface, no release agent, easy demoulding, easy to clean

(4) Stable weather resistance. High mechanical strength, no shrinkage, no swelling, no cracking, no deformation, stable size, alkali-resistant anti-corrosion, flame retardant and waterproof, refusal to prevent rodents and insects under -20 ° C to +60 ° C temperature conditions

(5) Conducive to conservation. The template does not absorb water and does not require special maintenance or storage.

(6) Strong variability. The type, shape and specifications can be customized according to the requirements of the construction project.

(7) Reduce costs. The number of turnovers is many, the plane mode is not less than 30 times, the column beam mode is not less than 40 times, and the use cost is low.

(8) Energy saving and environmental protection. Scrap and scrap templates can be recycled and zero waste

Plastic template disadvantage

(1) The strength and stiffness of the plastic building formwork is too small

The static bending strength and static elastic modulus of plastic building templates are small compared with other templates. The domestic application of plastic building templates is lower in strength and rigidity than bamboo (wood) templates, and much lower than the external GMT templates.

(2) Low load capacity of plastic building templates

At present, plastic building templates are mainly used as flat roof and floor slabs in flat type, and the load capacity is low. As long as the spacing of the secondary beams is properly controlled, the construction requirements can be met. However, to be used as a wall column formwork, it must be processed into a steel frame plastic formwork. Therefore, it is necessary to adjust the formulation of the plastic building formwork, improve the production process, improve the performance of the plastic building formwork, and also develop the GMT formwork.

(3) The thermal expansion and contraction coefficient of the plastic building formwork is large

The thermal expansion and contraction coefficient of the plastic building formwork is large, and the thermal expansion and contraction coefficient of the plastic plate is larger than that of steel and wood. Therefore, the plastic building formwork is greatly affected by the temperature, such as the high temperature period in summer, and the temperature difference between day and night reaches 40 °C. According to the data, At high temperatures, the expansion and contraction of 3m long plates can reach 3mm~4mm. If the construction is laid at night, the middle part of the formwork will be arched at noon; if the construction is laid at noon, the formwork shrinks at night to produce between adjacent plates. 3mm ~ 4mm gap

To solve the problem of large expansion, the expansion coefficient can be reduced by adjusting the material formulation and improving the processing technology. In addition, during the construction, you can choose an average temperature time to lay the board, or add a sponge strip between the board and the board, which can eliminate the template gap, ensure that the poured concrete does not leak slurry, and can solve the problem of arching at high temperature.

(4) Electric welding slag is easy to burn. Plastic construction welding slag is easy to burn. Plastic building formwork. At present, plastic formwork is mainly used as floor slab formwork. When laying steel bars, the welding slag temperature of electric welding is very high due to the connection of steel bars, falling on plastic On the template, it is easy to burn the board surface and affect the surface quality of the formed concrete. Therefore, a flame retardant can be appropriately added to the polypropylene to improve the flame retardancy of the plastic template. In addition, protective measures can be taken during the welding work, such as sending a stone cloth to the welder, the flat template can be laid flat under the solder joint, and the vertical template can be placed next to the solder joint by the small template, so that the welding can be solved. Bad plastic building template problem.

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