PROJECTS
JOHANNESBURG TWIN-DECK
HIGHWAY BRIDGE REPAIR Several Sika products were specified
SikaTop Armatec-110 EpoCem was
for structural repairs, strengthening
used as a protective coating for exposed
and the coating of a 1,02km section of
rebar and Sika Monotop-615 HB and
Johannesburg’s M1 twin-deck highway
SikaGrout-212 were applied for the repair
bridge between Newtown and Fordsburg.
of lateral and vertical bridge elements.
The bridge consists of two reinforced
SikaWrap-300 C was used for strength-
concrete deck super-structures mounted
ening reinforced concrete structures and
on concrete columns, one directly above
for increased sheer load capacity.
the other. The R15 million rehabilitation
T he br idge’s c oncr e t e sur f ac es
project required the expertise of many
were treated with the Sikaguard-705 L
specialists, including main contractor
Silane water repellent and SikaTop Seal-
Khato Civils, which was assisted by 17
107. The latter is a polymer modified
small, medium and micro-enterprises.
waterproof cement coating which is
A major challenge for all involved was
33
chloride- and carbonation-resistant.
the requirement for the motorway to
The council had stated that the main
remain open to traffic. Therefore, it was
concern was the safety of motorists and
anticipated that it would be difficult to
ensuring that all product applications
complete the task within the allotted
were executed correctly at every stage,
22-month time-frame. However, thanks
so all those involved in the project
to the use of Sika’s tailor-made products
were provided with training and on-site
and the appointment of a committed
support by the Sika team. This included
contractor, the project was completed
training such as surface preparation,
three months ahead of time.
product mixing and product application.
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