How to deal with fly ash construction waste
With the acceleration of urbanization and the rapid development of the construction industry, the disposal of construction waste is becoming increasingly prominent. Among them, fly ash is a common construction waste, and its treatment and utilization are of great significance for environmental protection and resource utilization. This paper will focus on the hazards, treatment technology and resource utilization of fly ash construction waste.
First, fly ash construction waste.
Fly ash is mainly used in the flue gas emissions of coal-fired power plants, and is a fine particle produced after coal combustion. In the construction industry, fly ash is often used as a concrete admixture, roadbed filling material, etc. However, with the completion of the construction project, the fly ash waste generated has gradually increased, becoming a common construction waste.
Second, the hazards of fly ash construction waste.
Occupy land: If a large amount of fly ash construction waste is not treated in time, it will occupy a large amount of land resources and affect urban planning and construction.
Polluting the environment: fly ash contains a large number of harmful substances, such as heavy metals, radioactive substances, etc., if not properly treated, it will cause pollution to soil and water sources, and harm human health.
Waste of resources: Although fly ash is a waste, it still contains a large number of valuable components, which will cause a waste of resources if it is not recycled.
3. Fly ash construction waste treatment technology.
Stacking and landfilling: Stacking fly ash construction waste in a designated site or landfill is a common disposal method. However, this method has problems such as large footprint and difficult pollution control.
Physical treatment: Aggregates of different particle sizes can be obtained by crushing, screening and other physical means to process fly ash, which can be used to make concrete, roadbed materials, etc. This method can realize the resource utilization of fly ash, but it requires a lot of energy.
Chemical treatment: Fly ash can be modified by adding chemical agents to improve its activity and increase its content in concrete. This method can improve the utilization rate of fly ash, but it needs to control the amount of chemicals added and the treatment conditions.
Biological treatment: The biological treatment of fly ash by microorganisms can decompose the harmful substances in it and improve its environmental performance. This method has the advantages of being environmentally friendly and sustainable, but requires long processing times and high technical requirements.
Fourth, the resource utilization of fly ash construction waste.
Preparation of new building materials: Fly ash is mixed with other materials to prepare new building materials, such as autoclaved aerated concrete, lightweight blocks, etc. These new building materials have good thermal insulation and thermal insulation properties, which can reduce the energy consumption of buildings.
Subgrade filling material: Using fly ash as subgrade filling material can improve the strength and stability of subgrade and reduce problems such as subgrade settlement. At the same time, this method can realize the large-scale utilization of fly ash.
Soil amendment: Fly ash is added to the soil as an amendment, which can improve the structure and fertility of the soil and increase the yield and quality of crops. This method can realize the resource utilization of fly ash and the recycling of agricultural waste.
Preparation of environmental protection bricks: Fly ash is mixed with cement, lime and other materials to prepare environmental protection bricks, which can be used on the internal and external walls of buildings, floors and other parts. This kind of eco-friendly brick has good sound and heat insulation performance, which can reduce the energy consumption and carbon emissions of buildings.
V. Conclusions and prospects.
The treatment and resource utilization of fly ash construction waste is of great significance for environmental protection and resource utilization. This paper introduces the hazards of fly ash construction waste, as well as treatment technology and resource utilization. However, with the continuous progress of science and technology and the improvement of environmental awareness, it is still necessary to continuously explore and innovate more efficient and environmentally friendly treatment technologies and resource utilization methods. At the same time, the first and all sectors of society also need to strengthen publicity and education efforts to improve the public's awareness and attention to fly ash construction waste treatment and resource utilization.