REMEDIAL REPAIRS – GENERAL CONSTRUCTION
Durban Heights Concrete Rehabilitation
Reservoir Hills, Durban
SIZE OF PROJECT
340 mega ℓ reservoir
Internal repair – Joints:
The removal of the old vulcanised system was to be removed where needed and prepared for the durajoint flexband high-performance waterproofing bandage system. This system repairs and seals expansion, construction and contraction joints in concrete.
Within the central floor area, it was discovered that negative water pressure was causing water ingress through the joints and to combat this, the use of a.b.e.® – distributed TheWorks sealant and adhesive was specified. This is a unique product that can be applied in submerged conditions, capable of handling positive and negative water pressure, yet at the same time performing two significant and vital functions:
TheWorks is a scypolymer adhesive; and TheWorks is also a sealant with a 50% movement accommodation factor (MAF).
The application of TheWorks was extremely successful and alleviated the problem of water ingress yet allowed for the bandage installation thus preventing interruption in the joint remedial work throughout the reservoir internally.
Internal repair – Floor & walls:
However, while the joints were being attended to, it was discovered that the drainage outlet chamber, as well as associated concrete wall structures also required attention. It was immediately indicated that these concrete substrates needed the application of duraflex®, a flexible cementitious system that was brush-applied without the use of a membrane – which represented a unique use of the product.
External repair –
This include the external upstand walls of the entire reservoir structure as well as the dish drainage channels, including the butts to the surrounding reservoir concrete pavement.
To repair the vertical face of the radial concrete pavement – from the top of the U-channel to the side elevation of the pavement – a.b.e.® supplied duraband 170 mm, epidermix® 318 and duraflex®,. The installation of this applicatoin is exposed, therefore it is UV stable.
The external reservoir walls required all wall joints to be rehabilitated using duraband. The entire external wallstructure was protectedd with silocoat which is a twocomponent polymer-modified cementitious coating.
OTHER PRODUCTS USED
PROJECT START & END DATES