Steep slopes necessitated concrete pumping service.
The Readymix business line of Lafarge South Africa played a key role in the construction of the recently completed Naval Hill Reservoir in Bloemfontein. The 35 megalitre reservoir is part of a new water supply system, which will serve over 45 000 people in Mangaung Metro Municipality, as well as unlock development in the area. Mangaung includes South Africa’s judicial capital, Bloemfontein, as well as the neighbouring towns of Botshabelo and Thaba ‘Nchu. Lafarge South Africa is the local presence of the international Lafarge Group, the world leader in building materials. The Naval Hill Reservoir project was in keeping with the Group’s new brand baseline, ‘Building better cities’, pledging Lafarge’s commitment to provide solutions that help to create better and more sustainable cities, which are desirable living environments for all people.
Construction of the reservoir began in May 2013 and was completed in October last year. The project provided employment for 37 local labourers and 39 skilled labourers. Using Lafarge’s highly regarded premium technical cement, Powercrete Plus CEM II 42,5R, the Readymix team supplied 700 m³ of standard 25 MPa concrete for the foundations, with 30 MPa and 35 MPa high strength grades for the walls.
Naval Hill is the highest point in the area with extremely steep slopes that made logistics difficult.
“We provided a concrete pumping service, but getting the concrete to the site was still a challenge as it restricted us to four cubic metres truck loads at a time,” comments Anathi Zitumane, Lafarge’s product development manager for Readymix.
“The reservoir was a heavily reinforced structure. We designed high slump pumpable mixes that were easy to place, but had early strength gain for rapid demoulding. Our team worked closely with the main contractor to overcome the challenges of the difficult location and the project was completed on time with excellent concrete finishes.
“While the country is experiencing many demonstrations protesting about poor service delivery, we are proud to have been involved in the Mangaung Metro Municipality’s important water delivery initiative,” adds Zitumane.
The reservoir will enable the extension of water delivery to some disadvantaged communities. It will also serve as buffer capacity for peak water demand periods and, by the positioning of the reservoir on the highest point in the area, has sufficient pressure to provide up to 24 hours of emergency supply in the event of electrical or mechanical interruptions.
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