Concrete blocks, bricks and other construction wastes dismantled from buildings are firstly classified, loaded into closed trucks, and transported to the production workshop. Various construction wastes are swallowed into giant machines. After being "digested" by the production line, "spit out" "Out of building aggregates.
"The construction waste is crushed and processed in one step. The coarse aggregate and fine aggregate produced can replace the mining of natural stone and the use of natural sand." said Mi Lin, deputy general manager of Linyi Lantai Environmental Protection Technology Co., Ltd.
Compared with natural stone aggregate, recycled aggregate has poor compressive ability and poor durability.
In response to this problem, Lantai Environmental Protection Technology Co., Ltd. and Qingdao Agricultural University jointly tackled key problems and developed key technologies for the recycling of waste concrete.
The technology won the first prize of Shandong Province Science and Technology Progress Award, which not only expands the application scenarios and scope of the product, but also enables customized architectural products through 3D printing.
At a construction site in Linyi, a building is using recycled concrete made of construction waste. The strength and quality indicators of this concrete are the same as those of ordinary concrete, but the cost is much lower.
"Ordinary concrete is about 450 yuan per cubic meter, and recycled concrete is about 400 yuan per cubic meter or less, and the quality is not much different." Zhang Weiqiang from Shandong Xiangshen Construction Group Co., Ltd. said.
Since Linyi City, as the Ministry of Housing and Urban-Rural Development, launched a pilot city for construction waste treatment nationwide in 2019, the Linyi Urban Management Bureau has coordinated and promoted the whole-process management of construction waste from collection, transportation, disposal and consumption, and insisted on market-oriented operation to promote innovation vitality.
Take Raflatac Environmental Technology as an example. The company has built 16 factories in various counties and districts, which can process millions of tons of construction waste every year.
Today, a construction waste recycling industry chain has been formed in Linyi. As long as a phone call is made in the community property, the recycling company will come to collect and transport construction waste. Guo Donghua, property manager of Xingtan Community, Lanshan District, Linyi City, said: "In the past, we did everything possible to find it. Companies take away construction waste, and they don’t know where they will end up. Now, construction waste is turned into treasure, which really saves time and effort.”
Liu Zongli, chief of the Muck Management Section of the Comprehensive Administrative and Law Enforcement Bureau of Lanshan District, Linyi City, calculated an account: after recycling 500,000 tons of construction waste, 300,000 cubic meters of natural ore resources can be saved, and 600,000 cubic meters of soil can be reduced. , saving about 90 acres of arable land, saving an area of 40 acres for stacking waste.
Li Qi, chief of the construction waste management section of the Garden Sanitation Center of the Linyi Urban Management Bureau, said that the engineering residue in the construction waste can be applied to greening backfill, landscaping, land leveling, road and foundation construction projects according to different main components. , including the construction of expressways and high-speed railways.
In addition, Linyi has also innovatively promoted recycled coarse aggregate to replace green mesh for covering bare construction sites.
In the demolition site of Fanyubu, Jiuqu Street, Hedong District, Linyi City, the green net was replaced by recycled coarse aggregate produced after crushing construction waste to cover the exposed construction site of more than 40,000 square meters, which saved the cost of dust control, had a significant effect on dust suppression, and achieved environmental protection. Both efficiency and economic benefits are improved.
"Linyi City takes the opportunity of creating a 'National Construction Waste Management Pilot City', strengthens policy support, strengthens process supervision, adheres to market operations, and makes every effort to promote the classification and disposal and resource utilization of construction waste." Xu Lijuan, Secretary of the Party Group and Director of Linyi City Administration Bureau Linyi said that by promoting the construction of resource disposal facilities, the research and development of construction waste recycling products, improving the collection method of construction waste disposal fees, and solving the problem of demolition and construction waste collection and transportation, Linyi has explored a new mode of construction waste management and realized a new construction waste management work. breakthrough.
Since 2021, a total of 23.61 million tons of construction waste has been generated in the urban area of Linyi, including 16.39 million tons of comprehensive utilization of soil remediation, project reuse, greening and backfilling, 1.618 million tons of recycled building materials in construction waste recycling treatment plants, and comprehensive utilization of construction waste resources. The utilization rate reached 76%.
(Economic Daily reporter Wang Jinhu)