Green asphalt delivery on Chinese expressways

Meeting high production demands, a Lintec CSM4000HRC asphalt mixing plant recently passed the 2 million tonne mark on key road upgrades in China’s Anhui province.

Owned by Lu’An Highway Industry, the plant set up for the S244 regional expressway project began in February 2016 on a site in Lu’An city, with production commencing the following June, providing hot-mix asphalt for the 23.04 km Huoqiu Garden to Xuji interchange section.

The plant produced approximately 150 000 tonnes for the 03 section of the highway, with the project completed in 2022.

Having concluded work on the S244, the equipment has since been used to carry out asphalt pavement repair and maintenance projects on other expressways in Anhui province.

On these works, the 320 tph capacity Lintec CSM4000HRC plant, paired with its HRC hot recycling system – retrofitted by the OEM – yielded efficient integration of RAP with exceptional productivity.

A key benefit for customers is that the HRC attachment can be retrofitted into any Lintec asphalt plant for the processing of milling waste or material excavated from road pavement recycling, significantly reducing the transport and production costs of bitumen and aggregates.

RAP production

During the asphalt production process, RAP materials are first pulverised in an asphalt recycling granulator and then processed and screened into the required sizes. They are then heated inside the HRC’s parallel drum and kept at the optimum temperature of 140-150°C before being fed into the RAP buffer silo prior to weighing.

By being kept completely separate from the virgin aggregates until mixing begins, the desired amount of RAP can be chosen for each batch. Thereafter, the RAP will join the separately weighed and screened virgin aggregates in the mixer of the asphalt mixing plant to produce a precisely controlled batch of hot mix asphalt.

Commenting on the plant, a spokesperson from Lu’An Highway Industry states: “Over the years, the superb output and quality of our Lintec CSM4000 has been greatly supported by the hot recycling system. It has given us huge cost savings, while ensuring mix quality remains at the highest level – all while being extremely simple to operate.”

Supplying solutions globally for the asphalt and concrete industries, Lintec & Linnhoff’s comprehensive product line-up comprises the Lintec, Linnhoff and Eurotec brands. Its products include asphalt mixing plants, concrete batching plants, pavement related technologies, and specialist concrete cooling solutions.