Abstract
In construction process, the formwork must be in contact with concrete to help the concrete solidify and fix the shape. Coating the formwork with a polymer can prolong its service life by reducing the amount of concrete sticking to the mold. Herein, an aluminum template substrate was coated with polyvinylidene difluoride (PVDF) or polyurethane (PU). Aluminum template material analysis was conducted, polymer film thickness was measured, and weather, moisture, pollution, salt spray, abrasion, impact, and acid and alkali resistance tests were conducted, as were tensile, bending, adhesion, hardness, and salt water resistance tests. Cement adhesion resistance was repeatedly tested. The experimental results indicated that the PVDF-coated template was superior. The novel PVDF Aluminum template exhibited high corrosion resistance and can be used in building materials, for example, in ceilings, partition walls, curtain walls, roof panels, and roof trusses. For reference, it can also be applied to ship structures and seaside and wind power generation projects.
Highlights
The design and application of aluminum alloy formwork represents a new generation of building formwork, especially for improving the construction efficiency and reducing the environmental impact [1–3]
The template coating layer was divided into a bottom layer of thickness approximately 20 μm and outer layer of thickness 30 μm; between each coating, the template was left to set for 1 h at room temperature
In addition to analyzing the thickness of the front and back coating films of polyvinylidene difluoride (PVDF) and PU substrates, the hardness was tested, weather, moisture, pollution, salt spray, abrasion, impact, tensile, bending, adhesion, salt water, and acid and alkali resistance tests were conducted, and other material properties were reviewed; each test was conducted in accordance with ASTM specifications
Summary
The design and application of aluminum alloy formwork represents a new generation of building formwork, especially for improving the construction efficiency and reducing the environmental impact [1–3]. Aluminum formwork has the advantages of high strength and resistance to acids and alkalis, cold, heat, moisture, and deformation. It is suitable for operations in environments at various temperatures and is especially suitable for rapid building construction. Aluminum-type material has strong bearing capacity and is light. It enables zero discharge of construction waste to be achieved during the construction process, reducing both the pressure of waste on the environment and the consumption of materials [4–7]
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