Triton has supplied both elements of a twin waterproofing system in the construction of the basement at the new DMC Building at Goldsmiths, University of London. This approach was proposed by City Basements (Toureen Mangan) and Triton and accepted by the architects, Stride Treglown of Bristol and main contractor, Willmott Dixon Construction.
Therefore the Triton watertight concrete system - the primary method of waterproofing – has been backed up by a Platon cavity drain system which was installed after completion of the watertight concrete construction.
Triton’s TT Super Admix was used to produce 900m³ of watertight concrete, added at a rate of 4.1kg/m3 to a mix of 20% PFA blend (minimum cement content 350kg/m3). The concrete was supplied by Hansons Concrete and used in the construction of the concrete capping beam to the top of the piles, the reinforced concrete liner walls (150mm - 200mm) and the reinforced concrete floor slab (300mm). All construction joints to the capping beam, wall capping beam, wall/floor and floor/floor joints were waterproofed with Triton’s TT Swellmastic and TT Waterstop forming a completely watertight concrete system.
The 300ml floor slab was poured in four stages.
Phase II of this waterproofing project involved the installation of a cavity drain membrane system. Although Triton’s TT Super Admix had been incorporated to the concrete as described above, plus TT SwellMastic and TT Waterstop to the construction joints; when this type of system is used alone, it can still be compromised by shrinkage, thermal cracking and poor joint detailing, leading to leaks which need to be repaired - and the leaks will only become apparent when water comes to bear on the structure.
Platon Cavity Drain Membranes were therefore specified as the second element to provide the extra security of a twin waterproofing system.
800m2 of Platon Multi was applied to the walls and 1800m2 of deeper studded Platon P20 to the floors. 300 linear metres of Triton Aquachannel (drainage conduit) was laid to direct any water which may ingress behind the membrane to the sumps.
The basement will house two lecture theatres, TV and photographic studios and associated areas. The basement is 4.5m deep and extends to the complete 1800m² footprint of the new, two storey building above.
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