With the rapid growth of highway mileage and car ownership in China, the demand for high-grade road maintenance is becoming increasingly severe. At the previous Wirtgen Foshan Opening Ceremony and Technical Festival, Prof. Yan Miao, the head of the Department of Road Engineering at South China University of Technology, said that under the trend of “building a new emphasis on the road” and “white-to-black”, a thinner wear layer structure ( ≤ 2cm) has a broad prospect. Among them, the high-tough and ultra-thin asphalt wear layer technology characterized by resource saving, shortened construction period, environmental friendliness and durability is successfully applied to more than 100 national enterprises such as Shanghai Yan'an Road, Hong Kong-Zhuhai-Macao Bridge artificial island passage and Baiyun International Airport. An important section of the road that generates a lot of economic, environmental and social benefits. According to Miao Miao, the VÖGELE Super 1800-3 paver equipped with a spray module fully demonstrates the advantages of synchronous paving technology in this process construction, and the future development space is huge.

Professor of Department of Road Engineering, South China University of Technology, Professor

Ultra-thin asphalt wear layer technology subverts traditional paving technology

In the speech entitled "Development and Application of High-Toughness and Ultra-thin Asphalt Wear Layer Technology", Yan Miao was comprehensively analyzed based on the status quo of China's high-grade highways, high-performance asphalt performance indicators, mixture design and performance evaluation. The industrialization trend of the technical achievements of ultra-thin asphalt wear layer.

At present, China's high-grade highways mainly adopt the asphalt pavement structure form. The surface wear layer generally adopts modified asphalt hot-mixed concrete with a thickness of 4cm-5cm, which has problems of high construction energy consumption, difficult life guarantee, and anti-sliding durability. Since 2002, a new type of pavement maintenance technology – ultra-thin wear layer paving technology has emerged in China. This technology can be applied not only to the maintenance of high-grade roads, but also to the construction method of new road surface wear layer.

Asphalt pavement structure

Yan Miao said that the high-tough and ultra-thin asphalt wear layer is a hot-mixed asphalt concrete superstructure layer with a thickness of only 0.8-2.0cm, based on synchronous paving technology, with high-performance modified asphalt and high-viscosity modification. Emulsified asphalt is a hot mix asphalt mixture and a tie layer material. The pavement after molding by the process has excellent crack resistance, impermeability, anti-slip and noise reduction performance.

Compared with NovaChip and other technologies, the high-tough and ultra-thin asphalt wear layer technology has four advantages: First, the structural layer is thin, the thinnest in the industry, saving resources, environment friendly, and wide application; second, good durability and high Asphalt oil film, which has far more anti-cracking performance than conventional asphalt mixture, can be directly applied to the cement concrete pavement, the target life is more than 8 years; the third is safe anti-slip, special skeleton design, making the road surface friction coefficient>55BPN; The fourth is smooth and quiet, reducing noise by 3-7dB compared to conventional roads.

The technical achievements are accelerating, and the market space is huge.

VÖGELE asphalt paver

According to Miao Miao, in recent years, the performance of asphalt cementing materials has been greatly improved, which provides a prerequisite for the development of a thinner surface layer with better performance. The special equipment with synchronous paving technology provides hardware support for the application and industrialization of the process.

It is understood that the VÖGELE brand is in a leading position in the field of pavers at home and abroad. With years of experience in developing and manufacturing road pavers, it provides a complete range of products and solutions for modern road construction. Thanks to VÖGELE's modular design concept, the VÖGELE Super 1800 – 3 SJ is equipped with a spray module and incorporates the ErgoPlus3 intelligent operating concept, which enables a dual-purpose machine with a wide range of applications: as a spray-type synchronous thinner. When paving machine, the maximum paving width is 6m. When used as a common paver, the maximum spraying width can reach 9m.

Yan Miao said that in the construction of high-tough and ultra-thin asphalt wear layer technology, VÖGELE Super 1800 – 3 SJ synchronous paving technology has obvious advantages: accurate measurement of adhesive layer oil and uniform spraying; ensuring that the adhesive layer system is not polluted and destroyed. The spraying and paving process is combined into one to improve the construction efficiency; the paving speed is fast, and can reach 6-20m/min.

Paving work

At present, the high tough ultra-thin asphalt wear layer has been successfully applied to Shanghai Yan'an Road, Hong Kong-Zhuhai-Macao Bridge artificial island passage, Baiyun International Airport, Donghaoyong Elevated, West Second Ring Expressway, Guang'ao Expressway, Guangfo Expressway, Zhujiang New Town CBD More than 100 important road sections have been implemented in 11 provinces and cities including Guangdong, Shanghai, Zhejiang, Hunan, Hubei and Hebei. The implementation area is over 5 million square meters and has been highly recognized by the market. According to the road performance evaluation test results, the high tough ultra-thin asphalt wear layer has good anti-sliding performance, bonding performance, flatness and water tightness.

According to professional calculations, this technology saves costs and reduces material consumption compared with the traditional 4cm AC-13; the road has long service life, the expected service life can reach 8-10 years, and the life cycle maintenance cost is low; during the construction process, low emissions, Low noise; high construction efficiency, small disturbance to the construction process, can achieve economic benefits, environmental benefits and social benefits. (This article is from Wirtgen China)