Materials

• 15% Reduction in material consumption across the Project lifecycle
• 100% Timber is reused/recycled or from sustainable sources e.g. AFS/FSC
• 10% Cement replacement material (by mass) in concrete
• 10% Recycled materials in road and subbase (including Reclaimed Asphalt Pavement)

During the review period JHCPB used 2,957m3 of concrete, 7,658 tonnes of steel and 50,736.19 tonnes of quarry materials in construction. The Project has used ~ 3,460m3 of low carbon concrete and achieved over 37% cement replacement across the Project. The Project has also achieved 62% recycled material in road base/subbase usage while procuring 93% of total timber from sustainable sources.

Below details reductions in materials embodied emissions and usage the project has identified for the construction stage of the project:

• Use of bespoke low carbon concrete mixes which incorporate a higher percentage of Supplementary Cementitious Materials (above 50% cement replacement) in R53 applications
• Use of recycled crushed glass as aggregate in concrete elements
• Use of Emesh recycled plastic fibres in lieu of traditional reinforcing steel in footpaths
• Research and development into the use of geopolymer concrete
• Beneficial reuse of tunnel spoil on site for civil works e.g. backfilling of declines and shafts
• Optimised design to reduce re-work and material usage including the removal of pavements in ancillary tunnels
• Investigating circular economy initiatives within our waste streams

The below graph details the project consumption regarding material consumption cumulatively over the life cycle of the project.