Time：2020-06-18 16:47:42
In recent years, the world has paid more and more attention to the topic of "sustainable development". This makes the problem that a large number of fresh water resources are seriously polluted and can not be used more and more attention. For big cities, because the urban ground is mainly paved by cement or asphalt, the urban heat island effect has become more and more obvious in recent years. At the same time, the land subsidence caused by the long-term lack of contact with water due to the isolation of the surface is not conducive to the circulation of surface water.
The new material permeable brick can effectively alleviate and change the current situation. It is made of building waste materials. It can be paved on the urban road surface in a large area to prevent rainwater from infiltrating into the surface and underground in rainy days, and provide timely supplement to the underground water. Moreover, the pollution degree of rainwater will be greatly reduced after the multi-layer filtration of permeable brick and surface layer, and the remaining pollution components can be basically degraded by natural microorganisms.
Permeable brick and its application
1.1 classification of permeable brick
Generally speaking, permeable brick can be divided into sintered permeable brick and non sintered permeable brick. Among them, sintered permeable brick is mainly made of industrial, construction and domestic waste materials, which are crushed and formed into The other one is mainly made of inorganic non-metal materials, which are bonded by binder, reinforced by mould, air dried and other environmental protection processes. Because there is no need to sinter, it is called non sintered permeable brick.
In addition, permeable brick can also be classified in terms of performance and use function, which can be divided into permeable brick of brick itself and permeable brick of brick itself that is impermeable or only permeable or weakly permeable.
1.2 environmental protection of permeable brick production
Permeable brick is mainly the secondary utilization of tailings waste, fly ash, construction waste, etc. it is a real green environmental protection product. The amount of construction waste in China is amazing, about 1.55 billion-2.4 billion tons, and the amount is still increasing year by year. However, in developed countries, the resource utilization rate of construction waste can reach 90% on average, but at present, the resource utilization rate of construction waste in China is less than 5%.
[2] By promoting the use of permeable bricks, the construction waste can be effectively used, which can not only solve many problems brought to people at present, but also reduce the negative impact on the ecological environment caused by quarrying. The use of permeable brick can also achieve the purpose of energy conservation, emission reduction and resource recycling. Therefore, it is very urgent and necessary to recycle construction waste and produce permeable brick.
1.3 current use of permeable brick at home and abroad
In view of the negative impact of impervious surface on groundwater resources in Germany, the "rainwater and flood plan" is proposed. The plan is mainly to change most of the city's ground into permeable ground. It is mainly aimed at the newly-built community, in which rain and flood utilization projects shall be designed for industrial, commercial and residential areas. If there is no rain and flood utilization measures, the government will levy rain and flood drainage facilities fees and rain and flood discharge fees.
Xi'an, a famous city in China, is also one of the cities where permeable bricks are widely used. The current goal of Xi'an and many cities is to build itself into a "sponge city", and to transform the city into a "sponge city", permeable bricks play a "lung" function in this process.
How to alleviate the damage of water resources and ecological environment by permeable brick
2.1 quality pollution of urban runoff
In recent years, the urban road runoff pollution is more and more serious, especially the oil leakage pollution of motor vehicles, heavy metal pollution and organic pollution. These pollutants, washed by rainwater, are all washed into sewers and then into rivers and lakes. The cost of sewage treatment is very high, and the cost of treatment is extremely expensive.
2.2 reduce the pressure of urban drainage system
At present, there are all kinds of problems in the urban construction and laying of sewer pipes. The drainage in some areas is not smooth, and there is water accumulation, which brings great inconvenience to people's life. Due to the damage of sewer materials and the decline of its functions, it has not been able to solve all kinds of problems such as urban drainage and flood control. When encountering heavy rain or rainstorm, the runoff produced by rainwater and flood far exceeds the bearing capacity of urban sewer network design. As a result, it is not a mirage to "see the sea" in major cities. It is mainly caused by various tragedies caused by the serious failure of urban drainage system to meet the discharge of rainwater.
2.3 regulating capacity of permeable brick to ecosystem
Permeable brick is a new type of green building material product for maintaining the ecological balance of the city. Its main purpose is to solve many problems caused by urban surface hardening and create a high-quality natural living environment.
Permeable brick is characterized by:
First, it has very good water permeability and air permeability. Rainwater penetrates into the ground quickly through permeable bricks, which can supplement soil water and groundwater in time;
Secondly, permeable brick plays an important role in regulating the temperature and humidity of the local space and alleviating the urban heat island effect;
Thirdly, rainwater infiltrates into the ground through permeable bricks, which can greatly reduce the pressure of urban drainage and flood control, and it can also act as a filtering device to further reduce water pollution;
Fourth, after the use of permeable bricks, there will be no water accumulation on urban roads after rain, which is convenient for travel, so as to improve our quality of life;
Of course, only a few of the advantages of permeable bricks are mentioned
