From the domestic situation, with the continuous improvement of highway grade, especially the rapid increase in highway mileage, the asphalt pavement maintenance and repair work put forward new and higher requirements. Speed ??up China's asphalt pavement maintenance and repair of new technology research, must be mentioned as soon as possible on the agenda. With the deepening of reform and opening up and the rapid development of the national economy, highway construction as China's economic construction of key projects, nearly a decade has been developed by leaps and bounds. As of the end of 1999, the national highway traffic mileage has reached 1.352 million km, two or more high-grade highway is 169,000 km, of which the highway from scratch, has exceeded 11600km. "Eighth Five-Year Plan" period, the national highway mileage increased by 11 million shirts, "Ninth Five-Year Plan" during the new highway mileage remained at 110,000 km, "15" target for the new highway 160,000 km. As the asphalt pavement has sufficient mechanical strength and a certain degree of flexibility, plastic deformation capacity, a high degree of vibration reduction, driving smooth and comfortable, low noise, and no dust and other characteristics, and the construction of high-grade highway to be built asphalt pavement. Especially the highway, more than 90% asphalt pavement. The road is exposed to the nature of the belt-like engineering structure, which has long been subjected to the sun, rain and snow, hot, cold and freeze-thaw, and bear frequent traffic instantaneous dynamic load of repeated effects. High-grade highway into the maintenance and repair period, some road damage has been quite serious. In recent years, a large number of asphalt pavement, due to various reasons so that many asphalt pavement early damage, and early access to maintenance and repair period, some of the first year of construction of the first year of construction will be damaged, the need for maintenance; Appeared that year to build the maintenance. asphalt paving methods asphalt road patching compound patented tarmac laying using multi tyre roller prices filling and sealing machine product overview