In daily life, bricks can be seen everywhere, but most of them are solid bricks made of stone powder, cement and sand, etc., which have poor water permeability, and the pavement paved with this solid brick is easy to accumulate water in extreme weather such as heavy rain. A building materials production enterprise located in the town along the Chongming Port recycles construction waste and transforms it into permeable, breathable and purified permeable bricks through technology, adding bricks and tiles to the construction of a sponge city in Chongming.
The reporter walked into the production plant of Shanghai Yixun New Building Materials Co., Ltd., and a small simulation test bench came into view, and the water sprayed on a small gray brick quickly seeped out from under the brick. Don't underestimate this brick, it is the "protagonist" in the construction of sponge city - permeable brick, which has the characteristics of good permeability, long permeability aging, pressure resistance, wear resistance, frost resistance, and anti-slip.
Construction waste is a solid waste generated in the process of construction, construction and demolition, which has a large amount and a wide area, and will also pollute the environment. With the rapid development of infrastructure construction in the mainland, the problem of construction waste disposal has become increasingly prominent. Liu Jun, head of Shanghai Yixun New Building Materials Co., Ltd., told reporters: "80% of the raw materials for our production of permeable bricks come from urban construction waste, and coarse-grained slag is selected after crushing, so that the crevice permeability of the brick body is better." ”
Crushed slag from construction waste
In the open space of the company's factory, 3-5 mm size of gravel particles piled up into a more than 2 meters high "hill", these are the raw materials for the production of permeable bricks - construction waste after crushing slag, followed by a certain proportion and water, cement, activated carbon after full stirring, after the grinding tool is shaped, the curing room is dried, the construction waste will be "transformed" into permeable bricks, the whole production process is about 30 hours.
Sponge city permeable bricks
Compared with ordinary solid bricks made of stone powder, cement and sand, the microporous honeycomb structure of permeable bricks is like a "sponge", which can quickly absorb, purify and seep out water, so as to achieve the effect of "rain stops and the road is dry", which can greatly alleviate the problem of urban surface hardening and balance the ecological environment. In Chongming municipal roads, riverbank slope protection and other projects, permeable bricks are gradually replacing solid bricks. They can be seen on the sidewalks of Baohui Road in Chongmingbao Town, Nanheng Canal Road in Chengqiao Town, Chongming Dongtan Spartina alterniflora Ecological Project, Tuanwang River Improvement Project and other riverbank slope protection.
PC imitation stone permeable brick
Ecological slope protection bricks
According to Liu Jun, the permeable bricks produced by the enterprise are mainly divided into four categories according to their uses: sponge city permeable bricks, the specifications are smaller, the shape is more regular, the surface is a thin layer of quartz sand, which is tiny concave and convex, which can not only prevent the road surface from reflecting, but also play an anti-skid effect, mainly used for sidewalks; The construction waste of ceramic tiles is made, very beautiful, the specifications are different, mainly used in squares and other places; green lawn bricks, relatively thick, the surface is green; and the ecological slope protection bricks used for river bank protection are the most special, each ecological slope protection brick has an oval or rectangular hole, these small holes provide space for aquatic plants and animals such as aquatic plants, small fish, small shrimp, crabs, frogs and amphibians, and can maintain the balance of water ecology while protecting the water environment.
The ecological slope protection bricks used in the Tuanwang River remediation project form small steps in the process of piling up layer by layer, which helps amphibians such as frogs and crabs to climb ashore
Sponge city, in layman's terms, is to build the city like a sponge, absorb water when it rains, and squeeze out the absorbed water when there is a shortage of water. Sponge city construction is a major decision made by the Party Central Committee and the State Council, through the control of urban planning and construction, starting from "source emission reduction, process control, and system governance", and adopting a series of technical measures of "infiltration, detention, storage, purification, use, and discharge" according to local conditions, so that urban rainwater runoff can be naturally accumulated, naturally infiltrated, naturally purified and fully utilized, and is an important starting point for promoting the construction of ecological civilization, practicing the concept of green development, and improving the quality of human life.
"In the past, most of the city's sidewalks and squares were 'concrete floors', and rainwater stayed on the surface of the ground, making it difficult for it to penetrate into the soil. The permeable brick first ensures that the rainwater can penetrate the ground and infiltrate into the soil, and the rainwater also has a certain purification effect in the process. How to improve the purification function of permeable bricks, we have also gone through countless experiments. Liu Jun told reporters: "In 2023, when we first started to make permeable bricks, activated carbon was added, and after the investigation of the China Building Block Association, this practice was pioneered by us, and the experimental results showed that the permeable bricks after adding activated carbon did have a certain purification effect." ”
Baozhen Baohui Road uses sponge city permeable bricks
In recent years, Chongming has widely introduced the concept of sponge city in the construction of building quarters, road squares and parks, among which the use of permeable brick paving in road squares is an important part of the process of building a sponge city. It is reported that Shanghai Yixun New Building Materials Co., Ltd. permeable brick mechanical automatic production, with an annual output of 200,000 square meters, is the only large-scale production of permeable bricks in Chongming, about 80% of the permeable bricks used in Chongming are from the enterprise, with the continuous advancement of sponge city construction, the output increases by about 8% to 10% per year.
Reporter and photographer: Guo Shanshan
Editor: Gu Jiali