What are the key points in the selection and selection of drainage pipe production?
The drainage pipe professional and everyone explained the following analysis:
Cement pipes are used in many projects in many industries, and its quality is a guarantee for large-scale projects. Generally speaking, the factors that affect the quality and function of cement pipes are cement pipe equipment, processing processes, and the selection of raw materials for cement pipes.
1. Cement pipe making machine cement selection: general portland cement should be used, because dry hard concrete is used, the mixed water ash is relatively small, and the dry shrinkage volume of the cement is small. The amount of unilateral cement is not high, so it is generally not presented Reduce cracks.
The initial setting time of the cement pipe making cement is relatively short, and the early strength is high. It has advantages for the stability and compactness of the concrete, avoiding the collapse of the inner wall, and improving the steam curing, so it is recommended to choose general portland cement.
2. Selection of sand for cement pipe making machine: Don't choose too fine or too rough, generally use medium sand, concrete has good workability, good impermeability and low concrete strength;
It is easy to collapse in the pipe making; the sand is too thick, the concrete is poor in workability, the anti-seepage function is good, and the mixed strength is high, and the pipe is not easy to collapse. Good, good formability, good anti-seepage function, and the concrete in the pipe is easy to collapse; low sand rate, poor concrete workability, poor formability, poor anti-seepage function, and the concrete in the pipe is not easy to collapse.
3. The strength level of cement for reinforced concrete drainage pipes for jacking construction should not be lower than 42.5
The use of early-strength cement is one of the methods to improve the early strength of concrete. For example: the 3-day compressive strength and flexural strength of P & # 8226; O42.5R are 29.4% and 14.2% better than those of P & # 8226; O42.5 .
High-performance concrete: Taking the specific requirements for concrete function of construction engineering design, construction and application as the overall goal, select high-quality conventional raw materials, reasonably add admixtures and mineral admixtures, choose lower water-binder ratio and optimize the mix ratio. Mixing green production method and strict construction methods, made into concrete with excellent mix function, mechanical function, durability function and long-term function.
Special product high-performance concrete: Lightweight aggregate concrete, high-strength concrete, self-compacting concrete, and fiber concrete that meet the technical requirements of high-performance concrete.
Conventional high-performance concrete: In addition to special-purpose high-performance concrete, concrete that meets the technical requirements of high-performance concrete and is routinely used. The use of early strength cement is one of the methods to improve the early strength of concrete.