Anyone that has ever driven on Gauteng’s roads will be familiar with the magnitude of the traffic congestion, especially on the region’s freeways and none more so that the M2 freeway located in the south of Johannesburg’s CBD.
As an important link between the N1 and N3 freeways, the M2 required urgent attention after sections of the road gave way and collapsed largely due to lack of maintenance and increased road traffic. Road closure would no doubt cause major inconveniences to businesses and residents alike, however following the Johannesburg Road Agency’s decision, the rehabilitation project was commissioned as an emergency and was completed a mere nine months later.
Local engineer saves the day
The contractor assigned to this project was Stefanutti Civils, who brought in an experienced engineer, Andre Oosthuizen. Interestingly, Andre was part of the initial road design team about 60 years ago. As many of the original drawings for this road could not be located, his input and sound advice on the project were invaluable. The rich history of this roadway necessitated the use of the best products for the job and so it was only fitting that Sika was honoured as supplier of choice.
Four of Sika’s products were used on the span of the road. Sikadur®-32 Normal, a bonding agent, was used to bond the new concrete to the old. Sika MonoTop®-412 NFG, the latest addition to the Sika mortar range, was used for structural repairs of the road. It has excellent performance for local conditions and is suitable for restoration work, structural strengthening and for preserving passivity. Sika Ferrogard®-903 Plus was applied to the concrete surface as a corrosion inhibitor. As a product that is based on organic compounds, it both delays the start and reduces the rate of corrosion. Finally, SikaTop® Seal-107 ZA, a waterproofing, chloride and carbonation protective coating was used for coating the barriers.
An approximate 150 million Rand was spent to refurbish this bridge – and looking down the road, it was most definitely money well spent.
For more information, contact Sika South Africa:
Tel: +27 (31) 792 6500
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