The fly ash content of 20% refers to the volume ratio of fly ash to concrete is 20%. Mixing an appropriate amount of fly ash into concrete can improve the properties of concrete, improve its compressive strength and crack resistance, etc.
Fly ash is a fine powder of volcanic ash that is burned, cooled, and collected from fly ash emitted from coal-fired power plants. Due to its high pozzolanic activity, it can undergo a secondary reaction with cement hydration products in concrete to form cementitious substances with high strength, thereby improving the structure and properties of concrete.
Mixing 20% fly ash into concrete can bring the following advantages:
Improve the working performance of concrete: fly ash can be used as a water reducer for concrete, reduce the amount of cement used in concrete, reduce the heat of hydration, inhibit the cracking of concrete, and improve the fluidity and pumpability of concrete.
Improve the durability of concrete: Fly ash can fill the pores in the concrete, make it more compact, improve the impermeability and frost resistance of concrete, and prolong the service life of concrete.
Reduce engineering costs: As an industrial waste, fly ash has a low cost, and the use of fly ash can reduce the cost of concrete.
It should be noted that the amount of fly ash is not as much as possible, and if the amount is too large, it may lead to a decrease in the performance of concrete. Therefore, in the actual project, it is necessary to test and adjust according to the specific situation to determine the optimal fly ash content.
To sum up, the fly ash content of 20% refers to the volume ratio of fly ash to 20% of concrete, which can be widely used in various projects by improving the performance of concrete, improving its compressive strength and crack resistance. However, it should be noted that the amount of fly ash is not as much as possible, and it needs to be tested and adjusted to determine the optimal amount of fly ash. At the same time, it is also necessary to strengthen the management and control of the construction process to ensure the quality and durability of concrete.