介绍

1986年开通时，M25或伦敦环城高速公路是欧洲最长的环形公路（188公里或117英里）。自那时起，该高速公路一直不断满足大伦敦地区日益增长的交通需求。

挑战

Recognizing the finite nature of resources for road building and the growing needs related to pavement maintenance, one of Britain’s leading infrastructure companies FM Conway was searching for a better way to provide maintenance service to M25.

决议

In collaboration with Toppesfield, FM Conway designed a special mix for resurfacing an M25 motorway section. The innovative design allowed for 50 percent recycled asphalt use. To enable such high recycled material content in the surface mix, bespoke premium polymer modified bitumen (PMB) was used. According to FM Conway, “The PMB was added to significantly improve the surface course durability by improving rutting and cracking resistance.”

FM Conway conducted an extensive laboratory evaluation of their new mix. They proved that such a far more sustainable solution could achieve the performance level of conventional surface treatment, which contains only up to 10 percent recycled material. As a result, the company’s new 50 percent recycled content asphalt mix solution was the first of its kind to be used on the UK’s strategic road network. In September 2019, FM Conway applied the mix solution to an M25 section between junctions 25 and 26, laying a 4.5 cm (1.8 in) thick layer.