A commitment cast in concrete

A commitment cast in concrete

Hannes Meyer – Cementitious Executive, AfriSam *

In April 2018, at its Peninsula Quarry operations near Cape Town, AfriSam’s top management team re-affirmed it’s long term commitment, further entrenchment and investment of assets and resources in the Western Cape.

AfriSam is renowned for its presence and dedication over decades of construction in the Western Cape, including the supply of cement, concrete and readymix for numerous iconic structures – to the benefit of the City of Cape Town, the Western Cape region and their communities as a whole.

Concrete, after water, is the most used

AfriSam plays an extensive and ongoing infrastructure development role in Cape Town and the Western Cape

product on the planet

With our considerable assets in the region, coupled with our innovative logistics operations in directing clinker from Gauteng to the Western Cape, we are able to maintain our competitive edge and deepen our commitment to Cape Town and the Western Cape,” said Hannes Meyer, AfriSam’s Cementitious Executive.

Richard Tomes, Sales and Marketing Executive for AfriSam

AfriSam’s top management team engage with the medai at the company’s Peninsula Quarry near Cape Town *

Richard Tomes, Sales and Marketing Executive for AfriSam, noted that the company is recognised as the market leader in the combined manufacture and supply of concrete materials, namely, cement, aggregates and readymix.

The AfriSam Peninsula Quarry *

We are aware of the progressive migration of people to Cape Town and the Western Cape, and note too that the turnaround of growth in construction will still take some time, however we have in place comprehensive plans for ongoing expansion in the region – to which we remain historically committed,” continued Tomes.

According to Meyer, AfriSam has in place fully approved and signed-off plans for expansion of its facilities in Saldanha Bay. This programme will build out on its existing limestone quarry in Saldanha with the addition of an EIA approved cement plant to be constructed when market conditions are favourable. “This project will enable significant expansion of all AfriSam products in the Western Cape.

Shaughn Smit, AfriSam’s National Sales Manager for Aggregates

Re-construction of the Silos is well advanced – 2016

Building on Meyer’s presentation, Shaughn Smit, AfriSam’s National Sales Manager for Aggregates, described a number of huge forthcoming developments in the Cape Town region: “AfriSam’s projected commitment programme is in direct support of the published 25 year build plan for the V&A Waterfront – where we continue to supply concrete on a daily basis; the “WES Cape” 25 year build plan (a project similar to Century City) which has already been approved by the City of Cape Town; the “Harbour Edge” development by Amdec which is in the pipeline for the Culemborg foreshore area near the Yacht Club; as well as the “joining of the bridges” which will result in another huge development below the bridges.”

De-construction and re-construction of the atrium progresses apace – 2016

Our finest example of commitment,” said Richard Tomes, “is without doubt our participation with the design of concrete for the iconic Zeitz Museum of Contemporary Art Africa (MOCAA) – the only contemporary art museum in Africa. Here AfriSam sponsored the supply of concrete at cost – and continues to play a key role as a stakeholder through active participation in educational and community programmes revolving around the museum.”

The Zeitz Museum of Contemporary Art Africa (MOCAA) and AfriSam

Project manager, Franette Ventura

A majestic work of modern engineering and concrete art

Originally completed in 1924, the 57 m high Silo dominates the Cape Town skyline.

Constructed by SA Railways and Harbours, the facility processed hundreds of thousands of tons of wheat, maize, soya and sorghum. It was sited to take advantage of its connectivity to the docks and the supporting rail infrastructure. An iconic building, it is considered an important contributor to Cape Town’s urban character.

Custom-built lifts operate inside two of the cut-away silo cylinders – servicing the six floors of art galleries above and providing visitors with a view into the atrium *

According to lead design architect, Thomas Heatherwick of the famed Heatherwick Studios in London, “We expected a rather cold surface inside the museum, but as we began to work with portions of the old concrete, we realized that it imparts a rather unique character to the building inside – a rather warm one at that.

Inside we were in danger of losing the extraordinary cellular structure, so we created a space that would help the visitor understand the building. So, you would walk in and navigate around. We took the idea of taking just one of those billions of grains of corn so that we could scale it up and use it as a model for the cutting tool to cut through.”

The cut through the concrete of the silo wall must be “like a knife through butter” – Thomas Heatherwick, architect

“like a knife through butter”

A core concept in reinforcing the strength of the remaining silo tubes so that they could be left in place and cut to the architect’s design, is the use of an inner concrete ‘jacket’. Using concrete supplied by project partner, AfriSam to engineer’s specification, the inner circumference of each silo tube was re-lined with 200 mm thick reinforced concrete to its exact cut dimension.

The top of the bins is capped with a glass roof which lets light enter the atrium from above. The bottom of the atrium is formed by graded steps that naturally contour the rounded space forming a flexible amphitheatre space that can be used for both events and displays.

In addition, a rooftop floor is dedicated to a restaurant, an education centre and a rooftop sculpture garden. It is from this level that visitors may embark on their ‘walk of faith’ across a high-performance glass floor that looks down into the atrium. Visitors arrive on this level by using one of two scenic lifts. These lifts operate inside two of the cut-away silo cylinders – with a view into the atrium. A third adjacent partly cut-away silo provides the third panoramic option – a steel spiral staircase. There are also conventional service lifts and the usual fire escape staircases, in line with standard building safety requirements.

There be Dragons in the Atrium

A spiral staircase winds up six floors to the rooftop *

This museum is a symbol and an icon of the confidence we feel about being Africans, the confidence we feel about our place in the world” said Mark Coetzee, Executive Director and Chief Curator.

 

Deep in the basement are the original silo grain release valves *

* Photos: John Thomé

Acknowledgements: Gareth Griffiths – extracts on Zeitz Museum

Advice to CT contractors on tender submissions during the water crisis

Advice to CT contractors on tender submissions during the water crisis

Master Builders Association Western Cape offers the following cautionary advice to its members regarding submission of tenders, due to the water crisis in the Greater Cape Town area:

At the time of submitting a tender for any works, both main contractors and subcontractors need to be very careful concerning the risks that the situation arising from the current water crisis presents and should carefully consider the following:

Theewaterskloofwater Dam, Cape Town, March 2018

Access to the municipal water supply for use on building site activities is likely to be further restricted, possibly to a major degree, and;
The cost of municipal potable water is likely to increase significantly;
To this end, the specific contract conditions should be carefully studied, particularly as they relate to the party recorded in the contract documentation as being responsible for the supply of water, and the cost thereof.

Note should also be taken that relevant conditions of contract vary significantly. Such variance is not only between different types of contractual agreements, but also between various editions (this is the case with various recent JBCC editions).

Care should be taken to study the specific contract conditions, particularly any amendments to standard conditions, and note taken of the fact that, even where Agreements contain force majeure provisions, this is unlikely to protect the contractor on newly submitted tenders.

Qualifying tenders is permissible in law, but carries risks, particularly in the public sector, where qualifications are likely to result in disqualification. Needless to say, collusion with other tenderers is unlawful.

The risks that will confront contractors and subcontractors include contamination of water from sources other than the municipal supply and stringent quality control measures must be maintained to ensure both the quality of the water as well as the testing of structural concrete and mortars to ensure compliance with design strengths.

Many subcontract agreements allocate the responsibility of supplying water to the contractor. Contractors need to take due account of this

Contract conditions in current tenders are likely to qualify and reduce the employer’s responsibility and risk and contractors must scrutinise the documents to ensure that they have a thorough understanding of the risks that any amended documentation shifts to them and take the appropriate precautions when submitting their tenders in order to contain or manage these risks.