Holborn Viaduct is a 14-storey, cutting edge workspace development currently under construction for Royal London Asset Management . An open approach between the entire steel supply chain resulted in new solutions, with some aspects already being used on other projects.

Multiplex and BHC, Heyne Tillett Steel worked collaboratively on the column designs to suit steel grade S460, which is 30% stronger than grade S355, enabling a reduction in the size and weight of the sections. With designs for columns at both S355 and S460, HTS and BHC engaged with EMR stocklists to match 87 tonnes of reclaimed steels to columns within the superstructure frame.  

The specification of ArcelorMittal electric arc furnace (EAF) over blast furnace steel plus the reclaimed sections have been used within the new frame, along with Xcarb Kingspan decking and fibre reinforcement in place of traditional mesh reinforcement where possible for the composite concrete floor slabs. This combination of innovative solutions has resulted in a reduction from 16,000 to 6,000tCO2.

Together with cement replacement options for the basement box and superstructure slab construction the combination of innovative steel procurement methods has resulted in an overall reduction of 143kgCO2e/m2.