CFG pile (cement fly-ash gr**el pile), which means cement fly ash gravel pile, is made of gravel, stone chips, sand, fly ash mixed with cement and water, and is made of various pile forming machinery with a certain strength of variable strength pile. A pile by adjusting the cement content and ratio.
In CFG piles, the amount of fly ash is an important parameter, which affects the mechanical properties, durability and economic efficiency of the pile. The following is an analysis of the amount of fly ash used in CFG piles:
I. Introduction. CFG pile is a method widely used in foundation treatment, which has the advantages of simple construction, low cost and good effect. Fly ash is an important part of CFG piles and has a significant impact on the performance of piles. Therefore, it is of great significance to reasonably determine the amount of fly ash to optimize the performance of CFG piles.
Second, the role of fly ash.
In CFG piles, the role of fly ash is mainly manifested in the following aspects:
Filling effect: the fly ash particles are fine, which can fill the gaps between aggregates such as gravel and stone chips, and improve the compactness of the pile.
Cementation: The active ingredients in fly ash can react with cement hydration products to form substances with cementing effect and enhance the integrity of the pile.
Improve workability: Moderate amount of fly ash can improve the workability of concrete, making concrete easier to construct and operate.
Cost saving: As an industrial waste, fly ash is relatively low, and the appropriate amount of use can reduce the cost of CFG piles.
3. Determination of the amount of fly ash.
The determination of fly ash usage needs to consider several factors, including geological conditions, design requirements, construction conditions, etc. Here are some suggestions:
Geological conditions: Geological conditions are one of the important factors affecting the amount of fly ash. In the soft soil layer, in order to improve the bearing capacity of the pile, the amount of fly ash can be increased appropriately. In the hard soil layer, in order to reduce the shrinkage and creep of the pile, the amount of fly ash can be appropriately reduced.
Design requirements: Design requirements are another important basis for determining the amount of fly ash. Depending on the design requirements, the amount of fly ash can be flexibly adjusted. For example, for piles with high bearing capacity requirements, the amount of fly ash can be appropriately increased to improve the strength of the pileFor piles with high durability requirements, the amount of fly ash can be appropriately reduced to reduce the permeability of the pile.
Construction conditions: Construction conditions are also one of the important factors affecting the amount of fly ash. In the actual construction process, the amount of fly ash needs to be adjusted according to the performance of the construction equipment, the construction environment and other factors. For example, when the performance of construction equipment is poor or the construction environment is harsh, the amount of fly ash can be appropriately increased to improve the fluidity and construction performance of concrete.
IV. Conclusions. In summary, the amount of fly ash in CFG piles is a parameter that needs to be flexibly adjusted according to the specific situation. When determining the amount of fly ash, it is necessary to comprehensively consider various factors such as geological conditions, design requirements and construction conditions to ensure the optimal performance of CFG piles. At the same time, with the progress of science and technology and the deepening of research, there may be more new methods and theories to guide the determination of fly ash dosage in CFG piles in the future.