Article

STRABAG UK and the University of East London (UEL) are developing a sustainable tunnelling grout through a £216,000 Innovate UK-funded Knowledge Transfer Partnership. The 26-month project aims to replace traditional cement-heavy annulus grout with a formulation made from repurposed construction waste and biowaste, achieving over a 61% reduction in embodied carbon.

This new grout partially substitutes cement and synthetic additives with excavated tunnelling material and agricultural by-products, promoting circular economy principles. The approach transforms waste streams into valuable construction inputs while maintaining technical integrity.