1, using high-grade cement, such as using early strength cement or adding early strength agent to concrete, can improve the early strength change of concrete.
2. Reduce the water-cement ratio as much as possible.
In order to reduce the free moisture in concrete mixture, hard concrete with small water-cement ratio and less water consumption is used, or water reducing agent is mixed into concrete.
3. Wet heat treatment: steam curing and high-pressure steam curing.
4, using mechanical mixing and vibrating.
Mechanical mixing can make concrete mixture more uniform than manual mixing, especially when mixing low fluidity concrete mixture. The longer the mixing time, the higher the strength of concrete.
5. Water suitable for drinking at ordinary times can be mixed and kept stable. If there is any doubt about the water quality, it is necessary to carry out tests to determine whether there are substances in the water that have a significant impact on the development of cement strength. When the ratio of compressive strength of cement mortar made of source water to that made of distilled water is less than 90%, it shall not be used for water stabilization construction.
Extended data:
Water-stabilized layer is the abbreviation of cement stabilized macadam layer, that is, cement solidified graded macadam 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.
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.
Baidu Encyclopedia _ Water Stable Layer?