Metal is one of the traditional and widely used mold materials, mainly including carbon steel and stainless steel. Carbon steel has high strength and rigidity, capable of withstanding significant pressure and repeated impacts, making it suitable for high-volume, high-intensity production. Surface treatments such as painting or galvanizing can improve its corrosion resistance to some extent. However, long-term use in humid or high-salt-alkali environments may still lead to rust, affecting the surface finish and demolding performance. Stainless steel, on the other hand, possesses excellent corrosion resistance and a long service life, making it particularly suitable for prefabrication of slope protection components in coastal areas or environments with complex water quality. However, due to its relatively high cost, it is mostly used in key projects with high requirements for surface quality and durability.
Engineering plastics have seen rapid development in the field of slope protection molds in recent years. Common materials include polypropylene (PP), polyethylene (PE), and reinforced nylon. These materials have low density and are lightweight, facilitating handling and installation, significantly reducing manual labor intensity. Simultaneously, plastic molds have smooth surfaces, good demolding performance, and produce concrete slope protection blocks with a neat appearance and high dimensional accuracy. Some high-performance engineering plastics also possess certain anti-aging and weather-resistant properties, allowing for long-term outdoor use. Furthermore, plastic molds are rust-resistant, easy to maintain and clean, making them suitable for small to medium-scale on-site prefabrication. However, their rigidity is relatively weaker than metals, and they may undergo slight deformation in high-temperature environments; therefore, careful storage and usage conditions are necessary in extreme climates.
Composite materials are created by combining materials of different properties through processing, commonly including fiberglass reinforced resin (FRP). These materials combine high strength with lightweight advantages, while also possessing good corrosion resistance and insulation properties. Composite material molds are low thermal conductivity, reducing temperature stress during the early hardening process of concrete and contributing to improved component quality. Their design flexibility is high, allowing for the customization of irregularly shaped molds according to different slope protection structures. Although the initial investment cost is higher, their long service life, low maintenance costs, and good overall benefits have led to their gradual adoption in high-standard projects.
When selecting materials for solid slope protection molds, factors such as project scale, construction period, environmental conditions, budget control, and frequency of reuse must be comprehensively considered. For example, large-scale centralized production tends to use durable metal molds; temporary or decentralized construction projects prefer lightweight plastic molds; and for projects with special environments or high-quality requirements, composite materials become the ideal choice. With the advancement of materials science, the materials for slope protection molds will continue to be optimized towards being lighter, more durable, and more environmentally friendly, providing more reliable technical support for infrastructure construction.