China makes asphalt pavement recycling technology more environmentally friendly
The day before, (Chinese) Wirtgen machinery limited company held "2015 International Forum on recycling technology of asphalt pavement in Zhuji City, Zhejiang Construction Company Limited, through the forum, the relevant staff and representatives of nearly 600 people attended the event.
Because of the increasing use of asphalt mixture in China in recent years, the amount of pollution is becoming more and more large, and the energy consumption and emission will be more prominent. If we use traditional technology to maintain roads, we will not only consume a lot of new materials, but also consume a lot of energy. At the same time, the old materials after milling will cause some adverse effects on the ecological environment.
China makes asphalt pavement recycling technology more environmentally friendly
However, the recycling of waste materials to road construction and maintenance can avoid the occupation and environmental pollution of waste materials, reduce the consumption of new materials such as stone, asphalt and cement, and reduce the cost of road construction.
In recent years, with the promulgation and implementation of relevant national laws and regulations, and the maturity of related technology and equipment, asphalt pavement recycling technology has been widely applied in highway construction and maintenance departments all over the country. As a famous professional manufacturer of pavement recycling equipment, a long time in the Chinese Wirtgen is committed to the development and promotion of basic road recycling technology. In 1986, the birth of crawler type 2000VCR regeneration Wirtgen cold, the cold regeneration technology economic and environmental protection into the road maintenance industry. In 1998, Wirtgen cold recycling technology of asphalt pavement will be introduced into china. Whether it is cold in plant recycling or cold regeneration, cold recycling technology in China Wirtgen market has been widely used in highway, municipal and highway maintenance project. Up to now, it has been used in all provinces and municipalities and autonomous regions except Tibet and Taiwan, with an area of more than 300 million m2. After a series of road recycling application of concept and technology standard promotion work, now Wirtgen road recycling technology has been widely used in highway, municipal and highway maintenance projects, in addition to Tibet and Taiwan outside of all provinces and autonomous regions have been successfully applied. Huang Songchang, a professorship professor at the Highway Research Institute of the Ministry of transport, pointed out in his speech that road construction and maintenance are high resource occupation, high energy consumption and high carbon emissions industry. It has many advantages, such as saving material, small influence on traffic, low construction cost and especially beneficial to environmental protection by using regenerative technology to maintain asphalt pavement. Under the background of protecting the environment and sustainable development, changing the development mode and introducing the concept of green highway, and reducing the consumption of resources and carbon emissions from construction and maintenance through technological innovation and the utilization of new materials, new equipment and new technologies, are particularly urgent.
The method of view practical solution to the construction
Influenced by many factors, such as road surface aging and traffic overload, the surface condition index of Zhuan railway has dropped sharply in recent years, which seriously affects the comfort and safety of driving. After comprehensive evaluation, the traffic management department decided to carry out a comprehensive renovation of the whole road surface. In order to respond to the call of national low carbon environment protection and circular economy, and popularize new materials, new processes and technologies, the project adopts foam asphalt in situ cold recycling technology to repair roads. During the meeting, the guests visited the construction company in Zhejiang Liancheng Zhu an line (Zhuji - Annwa) project construction site of highway pavement repair.
Before maintenance, the safety line surface structure from top to bottom for 4cm asphalt layer AC-13, 6cm AC-20, 20cm asphalt under layer of cement stabilized gravel and cement stabilized macadam base 20cm, maintenance of its structure from top to bottom for 6cm modified asphalt, AC-16 layer, 18cm and 20cm cement cement stabilized macadam base stabilized macadam base 15cm foam asphalt cold recycling.
Foamed asphalt on site cold recycling technology refers to the use of large cold regeneration equipment of old asphalt pavement crushing, crushing and mixing at the same time adding foam asphalt, and recycled re paving pavement, as a base or bottom layer structure in the high grade highway. Foamed asphalt mixture (adding cement) is a kind of material between cement concrete and asphalt concrete, can effectively balance the rigidity and flexibility, which can overcome the defect of the existing semi-rigid pavement damage, delay time, and gradually realize the diversity of pavement structure, and can save a lot of resources and funds.
Xue Zong, from Henan XinDa Engineering Machinery Co., Ltd., said that they had been engaged in the renting of common pavement maintenance machinery, such as pavers and rollers. In recent years, the rate of return on investment of these 2 equipment has also declined as the competition of renting prices has increased. Last year, Wittgen WR 2000 XL and WR 250 type cold recycling machine was purchased last year, which not only can make cement cold regeneration, but also can make cold recycling of foamed asphalt and emulsified asphalt. It has wide application and relatively large engineering demand. In the future, with the implementation of energy saving and environmental protection policies and the maturity of regeneration technology, the industry will be more likely to use recycled technology to repair asphalt pavement.
Nowadays, the demand for environmental protection is becoming more and more vigorous in our country, and the environmental protection equipment like Wittgen has also been more and more supported and welcomed by the users and the government.
