When the upgrade and extension of a major water works project falls behind schedule, ProAll Reimer Mixers lift the crew back on track.
Klipdrift water treatment works is a water purification plant near Hammerskraal, South Africa, about 30 kilometres north of the capital Pretoria. Gathering water from the nearby Pienaars river and Roodeplaat canal, Klipdrift produces over 42 million litres of water per day, providing potable water for over 150,000 people in the surrounding areas.
When a plan to upgrade and extend the Klipdrift facility was approved by owner Magalies Water, much of the job went to Ultimate Dynamic, who handle planning and project management for civil construction projects all over South Africa. The job called for large amounts of concrete for filter blocks, pump stations, and reservoirs that had to be totally impervious. J.J. Fivaz, who served as concrete specialist on the project, explains the elements of the mix design: “we are using dolomite, which doesn’t corrode as easily as normal stones, or, let’s say, granite. We are using a 90mm stone, and supersand that has a fine content of more than 10%. With these three components we can pretty easily mix water-tight concrete for a water-tight structure. Right now we’re getting 35 MPA concrete, but we are always over-strength. We are getting around 10 MPA over strength, so we are looking at about 45 MPA. And we also work with a specific water-to-cement ratio, which is 0.55 for water retaining structures.” Nico Swanepoel, site manager for Ultimate Dynamic, originally opted for traditional concrete
delivery methods using batch plants and drum trucks. As the weeks went by, however, the project fell increasingly behind schedule. As worries about the fixed completion date swelled, Swanepoel was forced to look for other options. There were scheduling difficulties, and the plant’s distance from the nearest batch plant made for long wait times—often loads could not be used because the quality of the concrete had deteriorated on the way. When Swanepoel switched to a contractor that operates ProAll Reimer Mixers, these problems washed away. Not only did Swanepoel now have quality control fully in his hands, but he could also eliminate travel time entirely. “Our main reason for now using Reimer Mixers”, explains Swanepoel, “is all the added value of having a mixing plant on site, available at a minute’s notice”.
In switching to volumetric mixers, Swanepoel also noticed a decrease in cost. “When the Reimer Mixer was introduced to us, one of the first questions is: what is the cubic metre price of concrete?” he says, “I was amazed with the price, regarding competitiveness to anyone we had supplying us up to that date. It was significantly cheaper than what we’re used to.” Fivaz explains that the pricing advantage is built into the delivery method: “because all components to the mix are loaded separately and everything comes together on site, you can eliminate extra costs. There is no transport, you don’t have to over-order concrete, and you don’t have wasted concrete. You only pay for what you need.”
Introducing Reimer Mixers to the operation paid off handsomely for Swanepoel. Within six weeks, his team was back on schedule—and under budget. “Deciding to switch to the Reimer trucks was huge for us”, he says, “and I’m sure it’s not the last time we’ll use them”.
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Photo credits: Magalies Water