Tianjin Waste Tire Asphalt Pavement Laying

The rapid increase in the number of motor vehicles has been accompanied by a steady stream of used tires. According to statistics, each year, China produces hundreds of millions of waste tires, which totals nearly 10 million tons. Tianjin also produces approximately 20,000 tons of used tires each year. If handled improperly, these used tires will become “black killers” that pollute the environment. Yesterday, the reporter learned from the Tianjin Municipal Highway Administration that “waste tyres” can be used as a “best companion” for asphalt for paved roads. This technology has been promoted in highway construction and maintenance in Tianjin. In the past two years, only in the highway construction, this modified asphalt mixture amounted to nearly 30,000 tons, while saving 452 tons of coal and reducing carbon dioxide emissions. The amount of 6596 tons.

This technology is called waste tyre rubber powder modified asphalt technology. In simple terms, the used tyres are crushed into rubber powder and then mixed into the asphalt to achieve the purpose of improving the quality of the asphalt. Because it can effectively solve the environmental problems caused by used tires, save asphalt resources, improve road performance, and prolong the service life of roads, it has been widely recognized in the field of road engineering and has been well-applied.

According to the Director of the Technical Department of the Tianjin Municipal Highway Administration, Cao Cheng introduced that according to the pilot implementation plan, Tianjin plans to apply this technology to highway projects such as the construction of the Jining Expressway, the Tangcheng Expressway, and the Tangjin Expressway expansion project. According to statistics, in 2011 and 2012, only in the highway construction, the amount of this powder modified asphalt mixture was nearly 30,000 tons. Only in the roads of Tianjin Avenue, Central Avenue of Binhai New Area and Zhongxin Eco-city, the total area of ​​roads with modified asphalt applied by plastic powder reached 2.15 million square meters.

In 2012, Tianjin used this waste tire made of rubber-powder modified bitumen in a total of 66 km of road maintenance work in the Tianjin-Shantou Expressway from Baojiu Jiuyuan to Jingxian. The project leader of Tianjin Urban Construction Binhai Road and Bridge Co., Ltd., responsible for construction, told the reporter that compared with the traditional asphalt pavement, the asphalt added with waste tire rubber powder laid on the road surface preserved the good elasticity of the rubber itself and made the pavement more flexible. As a result, driving is more comfortable and the bumpiness is reduced. At the same time, the “improved” asphalt not only has the advantages of environmental protection and energy saving, but also prevents blind spots caused by skidding and reflection of the vehicle when the road is wet. In addition, rubber asphalt roads have large gaps, make it easier to absorb sound, and can effectively reduce traffic noise, which is equivalent to a 30% to 40% reduction in vehicle traffic. During construction, the amount of asphalt used on this 66km expressway should be 800 tons. The consumption of approximately 2 tires per ton of mixed material accounted for a total of 16,000 tons of mixture, which consumed 32,000 old tires. Due to the good results, this year's maintenance of the Beijing-Shanghai Expressway undertaken by the company also uses this material.

This reporter learned that this year Tianjin will use rubber powder modified bitumen 9600 in highway maintenance and repair projects such as Tianjin-Shantou Expressway, Binshi Expressway, Rongwu Expressway, Jin-Jin Expressway, Beijing-Shanghai Expressway, Jinbao Expressway, and Tangjin Extension Project. Ton. Due to the improvement of its new technology, it is possible to save 159 tons of coal and 2,318 tons of carbon dioxide.