What types of hydraulic concrete are there?
Hydraulic concrete can be divided into the following categories according to its working conditions:
1. Classified according to the relationship between buildings and water level
The ones that are often located in the water are called underwater concrete; those in the water level change area are called water level change area concrete; those above the water level change area are called water level soil.
2. Classification by volume and location
According to the volume of the concrete building and its position in the large-volume building, it can be divided into three categories: large-volume internal concrete (small cross-section with a size of more than 2.5 m), large-volume external concrete and non-bulk concrete .
The so-called large-volume concrete refers to any large-scale cast-in-place concrete, that is, the concrete is large enough to take measures to properly deal with the heat generated and the subsequent volume changes, and requires reducing cracks to a small degree.
3. Classification according to whether it bears water pressure
According to the condition of bearing water pressure, it can be divided into two types: hydraulic concrete and non-hydraulic concrete.
The difference between hydraulic concrete and construction concrete
The structures and buildings of water conservancy projects, such as dams and water transportation terminals, have to bear the pressure of water. They are huge, ranging from tens of thousands of cubic meters to hundreds of thousands or even tens of millions of cubic meters. Most of the concrete used is large Volumetric concrete. Controlling the temperature rise of concrete and preventing temperature stress cracks are the keys to the success of construction. Therefore, it is necessary to make efforts to reduce the amount of cement during the preparation to reduce the adiabatic temperature rise of concrete and improve the crack resistance of concrete.
The construction concrete, that is, the ordinary concrete structure is relatively small in volume and densely reinforced. Because the pumping construction is mainly used, the fluidity of the concrete is required to be high (generally 100 ~ 220 mm). In addition, the concrete strength range used in ordinary concrete structures is much larger, C30 to C50 are commonly used, and the high ones may reach C70 and C80.
Construction characteristics of hydraulic concrete
Due to different uses of hydraulic concrete, its technical and quality requirements are different from those of general industrial civil construction concrete. In addition to strength requirements, it also meets the requirements of impermeability, crack resistance, frost resistance, tensile resistance, and tensile resistance according to the location and working conditions. Design requirements such as impact resistance, weathering resistance and corrosion resistance.
Hydraulic concrete construction generally has the following characteristics: