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07 November 2019

The continuous casting of 764 m3 of concrete in
just over 13 hours marked a milestone for Gothic Construction. This record
continuous pour was successfully executed in conjunction with AfriSam during
the casting of the first phase of the post-tensioned deck slab at the Waterfall
Mall in Rustenburg. 

The contract for the extension of the Waterfall Mall consists
of the addition of an upper parking deck, an increase of retail space with full
services for Dis-Chem to a total of 1 800 m2, as well as the
extension of the basement parking area by 10 000 m2.

Gothic Construction elected to cast the large
post-tensioned slab in two phases of continuous pours to eliminate the need for
construction joints. The first phase covered an area of 2 646 m2 using
a 30 MPa AfriSam Post Tension Mix with an integral waterproofer supplied by

Fifteen AfriSam readymix trucks ensured the uninterrupted
supply of concrete with two 36-metre boom pumps on site place the concrete.

The second phase of the deck, covering 2 062 m2,
was cast a few weeks later, using 624 m3 of concrete in another continuous
pour and took 11 hours to complete.

Maurice Janse van Rensburg, AfriSam’s territory sales
manager for the North West Province, explains that this achievement was significant
as all the concrete was supplied from AfriSam’s plant in Rustenburg. The
AfriSam team ensured uninterrupted delivery by using all available trucks, having
a generator on standby and additional water tanks. Careful planning went into maintaining
stock levels of all materials.

The roof of the basement parking extension also
formed the slab for the increase in retail space. The most economic design was
a coffer slab covering an area of 1 260 m2. The concrete supplied
for the coffer slab was a special 30 MPa AfriSam Retainer Mix requiring minimal
vibration. The mix was ideally suited for quality off-shutter finishes.

Representatives of both AfriSam and Penetron
were on site during the concrete placing to take the necessary samples for
quality testing. Gothic Construction also ensured that independent sampling was
carried out.

Hannes van Rensburg, Gothic Construction’s contract manager,
emphasises that the achievements on this project can be accredited to the good
working relationship between all the stakeholders. The project is on schedule for
completion in mid-December.

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