Recycle and reuse construction waste, so that waste is no lo

02.02.2021

With the acceleration of industrialization and urbanization, the construction industry is also developing rapidly, and the accompanying construction waste is increasing. The amount of construction waste in China has accounted for more than 1/3 of the total urban waste. In a period of rapid economic development, and Chinese hundreds of millions of tons of construction waste are inevitably generated every year. If it is not handled and used in time, it will inevitably bring adverse effects to society, environment and resources. However, the vast majority of construction waste is transported to the outskirts or villages by the construction unit without any treatment, stacked or buried in the open air, which consumes a large amount of construction funds such as land acquisition fees, garbage removal and freight. At the same time, problems such as spillage, dust, and fly ash during the cleaning, transportation and stacking process have caused serious environmental pollution.

Construction waste hazards

1. Random stacking of construction waste is prone to safety hazards

The construction waste piles collapsed. Construction waste was randomly piled up Wuyuan Cheng city collapsed, obstructing roads and even rushing to other buildings. In the suburbs, pits, ponds and ditches are mostly the preferred storage sites for construction waste, which not only reduces the capacity for water regulation and storage, but also reduces the surface drainage and flood discharge capacity.

2. Construction waste seriously pollutes water resources

Due to fermentation and rainwater leaching and washing, as well as surface water and groundwater soaking, the sewage or leachate will cause serious damage to the surrounding surface water and groundwater in the process of stacking and landfilling construction waste, .

3. Construction waste affects air quality

In the process of stacking construction waste, certain organic substances decompose and produce harmful gases under the action of temperature and moisture.

4. Land occupied by construction waste reduces soil quality

After long-term exposure to sunlight and rain from construction waste, harmful substances in the waste infiltrate into the soil, causing a series of physical, chemical and biological reactions to cause soil pollution and reduce soil quality.

2: Construction waste recycling value

Studies have shown that every 100 million tons of construction waste can be produced 24.3 billion standard bricks and 36 million tons of mixed materials .Reducing soil extraction or replacing natural sand and stone by 10 million cubic meters, will save 2.7 million tons of coal, and addi 8.46 billion yuan in output value. In addition, contrary to simple stacking and landfilling, the resource utilization of construction waste can also reduce 50% of nitrous oxide, 99.3% of nitrogen compounds and 28% of carbon monoxide emissions, reducing land resource waste and environmental pollution. The conversion rate of aggregates produced by the recycling of construction waste can reach 85%, and 1 ton of construction waste can produce 0.85 tons of recycled aggregate and 0.01 tons of scrap steel. The selling price of recycled aggregates is about 40-60% of the selling price of natural sand and gravel materials, which makes machine-made sand produced by the recycling of construction waste to occupy an absolute price advantage in the gravel aggregate market.

Three: How to recycle construction waste

1. Use waste building concrete and waste masonry to produce coarse and fine aggregates, which can be used to produce concrete and mortar with corresponding strength levels or to prepare building materials such as blocks, wallboards, and floor tiles. Thick and fine aggregates can also be used for highway pavement bases after adding solidified materials.

2. Use waste bricks to produce aggregates, which can be used to produce recycled bricks, blocks, wallboards, floor tiles and other building materials.

3. The muck can be used for road construction, pile foundation filling, foundation foundation, etc.

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