A Study on Tunnel Lining Concrete with Crushed Aggregate from NATM Muck

The reduction of the waste products, and the waste recycling as alternative construction materials is essential in the practice of sustainable development in civil engineering. The utilization of excavated muck after rock tunnelling has been executed worldwide but not always in propitious circumstances in countries where the legal backbone of the waste recycling is not strong enough against the conventional use of raw materials. The study and publication of such application cases is considered as an effort for the propagation of sustainability in tunnel projects. With that aim, the paper focused on a case study in Vietnam where the muck after the NATM tunnelling had been used as coarse aggregate for the C25 tunnel lining concrete. Compared with an equivalent lining concrete using raw material, through the analysis of the test results at construction site, the possibility of using recycled muck for tunnel lining was proven.