Construction on the Xi’an utility tunnel project is ongoing. With estimated total costs of US$2.6 billion, it is currently China’s single largest infrastructure project. The planned 145.5-km (90-miles) of tunnel encompasses a main tunnel and numerous branch tunnels that connect the capital city with the adjacent Lantian and Huyi counties and the Yanliang and Lintong districts.

The Kunming Road tunnel section, completed in May 2019,  is a crucial part of the entire project: a main tunnel that crosses over three subway stations, seven subway tunnels, and a difficult geologic zone.

The base of this tunnel section – at 12-17 m (40-56-feet) underground – is at the same level as the city’s Dahuan River, where the underground water level fluctuates seasonally from – 5-16 m (16-53-feet) below the surface.

PENETRON ADMIX ensured that the complex underground design would remain waterproof and durable during its projected 100-year life cycle. PENETRON ADMIX was used for the concrete structure of the three bottom tunnels exposed to the constant – and fluctuating – hydrostatic pressure deep underground. Not only did PENETRON ADMIX crystalline admixture meet the Level I waterproofing grade and 100-year durability standards, the Kunming Road section was also completed before the allotted deadline, thanks to a much simpler construction method when compared to the installation process for a membrane solution. Clickhere for further information on the project and visit www.penetron.it. 26/19.