Water stability layer (cement stabilized gravel layer), also known as waterproof layer or waterproof layer, is a very important part of road engineering. It is located between the subgrade filling layer and the pavement layer, the main purpose is to prevent the upward migration of groundwater and moisture, to ensure the stability of the subgrade filling and the uniform bearing force of the pavement. The main materials used are clay, sand, silt, cement, steel slag and so on. These materials can be used alone or in combination with each other according to their characteristics to achieve good water resistance and compaction. Construction methods are mainly rubber roll compaction method, paving method and spray method. These construction methods have their own characteristics, which should be selected according to the specific situation of the project. The water stability layer is a key link to ensure the stability and performance of the road. Although it is a structural layer that is not paid much attention to by people, its role and influence are crucial.
