It takes 7 days to pave the asphalt concrete surface after paving the water-stable layer.

Because it needs moisture curing for at least 7 days, and the compactness, 7-day saturated compressive strength and rebound modulus meet the requirements before paving.

Water stable layer:

1, water-stable layer is the abbreviation of cement stabilized macadam layer, that is, cement consolidated graded macadam is used and it is completed by compaction and maintenance. The water-stable mixture ratio should be mixed in the laboratory in advance to determine the cement content and the proportion of coarse and fine aggregate, and at the same time determine the maximum dry density. A large amount can be mixed in a water-stable mixing station.

2. Cement stabilized macadam takes graded macadam as aggregate, fills the gap of aggregate with a certain amount of cementing material and sufficient mortar volume, and spreads and compacts it according to the principle of embedding and squeezing. Its compactness is close to its compactness, and its strength mainly depends on the interlocking principle between crushed stones. At the same time, there is enough mortar volume to fill the gap of aggregate. Its initial strength is high, and the strength increases with age, and soon forms a plate shape, so it has higher strength, better impermeability and frost resistance. The dosage of water-stabilized cement is generally 3%~6% of the mixture, and the 7-day unconfined compressive strength can reach 1.5~4.0mpa, which is higher than other subgrade materials. After water survives stably, it is not muddy in rain and has a solid surface, so it is an ideal base material for advanced pavement.

3. According to the Technical Specification for Construction of Highway Pavement Base by the Ministry of Communications, the cement stabilized macadam used in roads belongs to medium-grained soil. Because cement and other cementitious materials are contained in water stability, it is required that the whole construction process should be completed before the final setting of cement and meet the quality standards at one time, otherwise it will be difficult to repair. Therefore, it is required to strengthen the construction organization design and plan management, increase the sense of urgency and responsibility of on-site construction personnel, speed up the construction progress, increase the degree of mechanized construction and improve the mechanical efficiency. The construction method of water stabilization is also in line with the development direction of modern large-scale mechanization, so the application of water stabilization in highway engineering will be popularized soon.

4. Water-stable materials are mainly composed of granular materials and mortar volume. The granular material is graded macadam, and the mortar volume includes water and cementitious materials, and consists of cement and mixed materials.

5. Mixed materials can be divided into two categories: active and inactive. Active substances refer to substances such as fly ash that can react with calcium oxide precipitated in cement. Inactive materials refer to artificial or natural mineral materials with no activity or low activity. The quality requirements for this kind of materials are fine and free from harmful components.