1. Mortar protective layer. This protective layer is made of portland cement or polymer cement, which has good water resistance, acid and alkali resistance and impermeability, and can effectively protect the waterproof layer.
2. Waterproof coating protective layer. This protective layer is made of waterproof materials such as polyurethane coating, asphalt coating and acrylic emulsion coating, which has high waterproof performance and can also prevent the waterproof layer from being damaged by ultraviolet rays and oxidation.
3. Protective layer of winding material. This protective layer is usually woven from polyethylene film or polyester fiber, which is mainly wound on the surface of waterproof layer to protect it, and is suitable for relatively flat walls or slopes.
4. Strip material protective layer. This protective layer is made of materials such as glass fiber reinforced plastic, ceramics or metal strips, and is mainly laid on the surface of the waterproof layer and welded together to prevent the waterproof layer from being mechanically damaged.
In a word, different protective materials and methods can be selected for the protective layer of culvert waterproof layer, which should not only ensure the close connection between the protective layer and the waterproof layer, but also have good water resistance, acid and alkali resistance and impermeability, so as to achieve the purpose of effectively protecting the waterproof layer.