A team from Jackson, Connect Plus and TechJoint have successfully trialled a new concrete waterproofing system, Matacryl WS, which has the potential to dramatically reduce project programmes and budgets on future concrete waterproofing schemes.
The Brentford Branch Line is an elevated section of carriageway between junctions 1 and 3 of the M4. The structure had previously been strengthened with an additional concrete slab, resulting in a thin surfacing course that had degraded, exposing the concrete underneath.
To repair the waterproofing, conventional methods would have involved laying a waterproofing course underneath an 80-100mm layer of asphalt, which would have added additional weight to the structure and led to the kerbs, crash barriers and fencing all having to be re-aligned - a costly and time-consuming process.
On this particular project, using Matacryl WS saved an estimated two months on the project programme, and approximately £500,000 in reduced labour, plant and lane rental costs, when compared to conventional waterproofing methods. Not all concrete structures will have the same weight challenges as the Brentford Branch Line, however, there are several benefits to this method which could impact future waterproofing schemes, making them safer, quicker and more efficient to undertake:
1. Reduced project programmes mean the travelling public are faced with less disruption
2. This, in turn, reduces the risk to our workforce, as they are spending less time out on the network
3. Projects can be planned and executed more efficiently because the material is less reliant on favourable weather conditions
4. The material can be hand laid or sprayed, which reduces the need for heavy plant, thus lowering risk to the workforce.
5. Shorter programmes, smaller workforces and fewer lane rentals all contribute to lowering overall costs