Cornelis River Dam undergoing major refurbishment

A wide range of Sika concrete repair and protection products were used in the Cornelis River Dam project, which needed major refurbishment in order to implement a sustainable regional bulk water supply scheme in the Phumelela Local Municipal area, prioritising Warden.

Various Sika concrete repair and protection products used in Cornelis River Dam project

The Phumelela Local Municipality is currently experiencing severe water shortages and is considering options to ensure the provision of a sufficient and sustainable potable water system for the future for both the short and longer term.

Water usage has been restricted throughout the past years, but water quality deteriorates on a daily basis. The high rural to urban migration and changing water use pattern, mainly as a result of the introduction of water borne sewerage systems under the bucket eradication program, place additional stress on existing infrastructure and resources. The final objective of this project is to implement a sustainable regional bulk water supply scheme in the Phumelela Local Municipal area, prioritising Warden.

The Cornelis River Dam, situated in the Free State between Johannesburg and Durban, 56 km North of Harrismith had undergone major refurbishment. The project commenced in June 2017 by contractors Raubex, and is scheduled for completion in May 2018. Sika’s reputable range of concrete repair and protection products were the top choice of specified products by project managers, Rudnat Projects CC.

BHM Readymix from Harrismith supplied all the concrete with SikaPlast V220 and Stallion 2 admixtures.

In order to grout the anchor rods into the rock, before pouring the concrete, to create the steps Intraplast-Z was used, an grout admixture that is designed to introduce micro bubbles into the grout mix, thereby creating wet volume expansion and to increase fluidity without segregation.

As a curing agent to prevent premature water loss, Sika’s Antisol E was sprayed onto areas of mass concrete. Forming a thin film barrier, this ready to use liquid curing compound does not disturb the normal setting action of concrete which is then allowed to cure and achieve maximum properties.

Separol-GU, an oil based release agent was used to provide easy release properties to the formwork and permitting a high quality surface finish of the dam wall. Sika micro fibres were specified to be used in the spill way concrete as well as in the concrete mix of the dam wall to reduce any crack tendencies in early-age concrete.

Sika concrete admixtures widely used in Cornelis River Dam project

The structure was primed with Sikagard-550 W Primer, prior to the application of Sikagard-550 W Elastic, an acrylic based emulsion, high build, protective coating providing a durable covering with excellent resistance to weathering.

As a surface hardener for concrete, Sikafloor CureHard-24 was used in the spillway concrete. This easy to apply compound reduces dusting of concrete floors as well as improves chemical and abrasion resistance compared to untreated concrete.

The concrete wall was repaired using Sika MonoTop-610, an easy to apply cementitious, polymer-modified, one-component slurry. This high quality primer provides excellent bond for Sika MonoTop-612 a high strength repair mortar containing silica fume and synthetic fibre reinforcement. Providing excellent slump resistance, it is particularly suitable for application on overhead and vertical surfaces.

Sika Waterbar Type O-20 was centrally placed in all the expansion joints. Manufactured from virgin thermoplastic PVC for strength and flexibility and easy, on-site welding, internationally tested Sika-Waterbars are used to seal construction and expansion joints in all water retaining structures. They are designed to withstand high water pressure and are supplied in rolls of various widths and types

Used as admixtures for the structural concrete and blinding concrete, Sika Plast Stallion-2 and Sika Plast V220 were used as multi-purpose water reducers and superplasticizers, utilizing Sika’s ‘ViscoCrete’ polycarboxylate polymer technology. Its higher ultimate strengths allow for greater engineering design, flexibility and structural economies.

Two main challenges faced during this project were to drill 21m into the ground and create a grout wall, before starting with the actual wall, as water kept rising when drilling into the ground. Drilling into the rock for the anchor rods was also another challenge due to the rock being so hard, which in turned caused the drill bit to break off or go blunt.

Regardless of these challenges, it is expected that this project will be completed in 18 months. The aim of the project was to refurbish 5000m² of concrete however it is assumed that the area will increase on completion of the project.

Have any questions, compliments or feedback?
  • This field is for validation purposes and should be left unchanged.
Antisol E concrete admixtures concrete curing agents concrete protection concrete release agents concrete repair concrete surface hardeners Cornelis River dam expansion joint sealers grout admixtures Intraplast-Z Separol-GU Sika Sika Waterbar Type O-20 Sikafloor CureHard-24 Sikagard-550 W Primer SikaPlast V220 Stallion 2
All Sika South Africa news
keyboard_arrow_upSika head office gets a revamp
keyboard_arrow_downSika head office gets a revamp

In order to maintain its professional corporate image, Sika South Africa undertook a refurbishment project in the company’s head office reception area, which included structural and aesthetic upgrades to the walls and flooring. Sika South Africa’s head office is located in Westmead, Pinetown, and is renowned for supplying speciality chemicals to the building and automotive industries. […]

keyboard_arrow_upSika technologies aid the upgrade of The Boulevard – Cape Town
keyboard_arrow_downSika technologies aid the upgrade of The Boulevard – Cape Town

The Boulevard, situated in Woodstock Cape Town, is an upmarket commercial landmark and a popular home to both local and international tenants. This uniquely beautiful, glass building was in need of a facelift to ensure the structure was of sound integrity. The project commenced in March 2018 and was completed in June 2018. When this […]

keyboard_arrow_upAnti-graffiti coating now in South Africa
keyboard_arrow_downAnti-graffiti coating now in South Africa

Sika is renowned for keeping up with technologies and innovative products and the introduction of SikaGard-850 AG (Anti-Graffiti) is no different. This product is a permanent anti-graffiti and anti-fly poster coating for the protection of concrete, wood, masonry and metal substrates.

keyboard_arrow_upCornelis River Dam undergoing major refurbishment
keyboard_arrow_downCornelis River Dam undergoing major refurbishment

A wide range of Sika concrete repair and protection products were used in the Cornelis River Dam project, which needed major refurbishment in order to implement a sustainable regional bulk water supply scheme in the Phumelela Local Municipal area, prioritising Warden.

keyboard_arrow_upSIKA sponsors SANCCOB’s new seabird hospital
keyboard_arrow_downSIKA sponsors SANCCOB’s new seabird hospital

The much-anticipated new seabird hospital for SANCCOB is scheduled for completion in December 2017. Sika was delighted to be given the opportunity to support this devoted organisation whose state-of-the-art seabird hospital, the largest development in the history of SANCCOB, will certainly fulfil a dream…

keyboard_arrow_upSika smoothens spectacular undulating chapel roof
keyboard_arrow_downSika smoothens spectacular undulating chapel roof

Challenges achieving the smooth surface required of a dramatically undulating chapel roof were successfully solved by a high performance fairing coat from Sika. The site was the 185-hectare, newly created Bosjes Resort in the picturesque Witzenberg district of the Western Cape where the dazzling Bosjes Chapel stands proudly at the foot of the Waaihoek Mountain.

keyboard_arrow_upA walkover for Sikafloor Garage
keyboard_arrow_downA walkover for Sikafloor Garage

To repair and coat all the imperfections in the floors, Sikadur-43 ZA (20 kits) and Sikafloor Garage (Telegrey, 450x5l) were specified. Sikadur-43 ZA is a three-component repair and filling mortar based on a combination of epoxy resins and selected high strength aggregates while Sikafloor Garage is a two-part, water-dispersed, epoxy resin-based coating suitable for concrete, […]

keyboard_arrow_upSika introduces Sikaflex Crystal Clear
keyboard_arrow_downSika introduces Sikaflex Crystal Clear

Sika announces the launch of new Sikaflex Crystal Clear, an optimum transparent sealant that can be used for all DIY and Contractor projects. Sikaflex Crystal Clear is a 1-component, transparent adhesive and sealant. Solvent-free, this multipurpose product complements the industry-renowned basket of Sikaflex -11 FC, Sikaflex Pro-3i and Sikaflex AT Façade. 

keyboard_arrow_upSika cures ailing Durban apartment block
keyboard_arrow_downSika cures ailing Durban apartment block

February 2016 marked the start of an estimated fifteen-month restoration project on one of the largest apartment blocks in the Southern Hemisphere. The site was the T-shaped Bencorrum Towers in Durban’s beachfront precinct, comprising 334 units and housing over a thousand people.

keyboard_arrow_upSika treatment for Cape Towns 27 Wale Street
keyboard_arrow_downSika treatment for Cape Towns 27 Wale Street

Sika’s globally acclaimed concrete repair and protection systems were the first choice for consultants Naylor, Naylor and van Schalkwyk for 27 Wale Street, a prominent government building in the busy city centre of Cape Town. Commissioned by the Department of Transport and Public Works, construction company Indawo commenced the challenging project in March 2015; the scope of works included structural and spalling repairs, waterproofing and painting of the entire facade of the building. 

keyboard_arrow_upSika renovates the Canadian Consulate in Pretoria
keyboard_arrow_downSika renovates the Canadian Consulate in Pretoria

In 2015 a national heritage building, dating back to the late 1800’s, was renovated using Sika’s reliable products. Having once been owned by a South African Navy sea captain, this majestic old home was subsequently bought in the 1950’s by the Canadian Government and has been used ever since as the main residence for the Canadian High Commissioner in Pretoria. 

keyboard_arrow_upSika® WT-200P
keyboard_arrow_downSika® WT-200P

Sika crystallises 100 years of waterproofing experience with the launch of their new SikaWT200 P ‘self-healing’ crystalline admixture.

keyboard_arrow_upSika introduces Sikalastic-560
keyboard_arrow_downSika introduces Sikalastic-560

Sikalastic-560 is a hybrid, economical and eco-friendly liquid applied waterproofing solution based on Sika Co-elastic technology (CET). This durable and versatile product is suitable for new construction and refurbishments on roofs.

keyboard_arrow_upSika AnchorFix®-S: fast-curing universal anchoring adhesive
keyboard_arrow_downSika AnchorFix®-S: fast-curing universal anchoring adhesive

Sika has extended their offering in the Anchoring range. This new two-part, general-purpose, anchoring adhesive is based on styrenated polyester and is intended for mechanical, electrical and plumbing works, as well as metal or structural work. Sika AnchorFix®-S covers the requirements for standard applications of low to medium loads.

keyboard_arrow_upSika lays the foundation for Simba
keyboard_arrow_downSika lays the foundation for Simba

When a repair mortar of exceptional quality was required at the Simba Chips premises in Isando, Johannesburg recently, concrete repair specialists, Spec-Con Engineering immediately specified a Sika manufactured, epoxy mortar for the project.

keyboard_arrow_upSika seals and waterproofs at Standard Bank HQ
keyboard_arrow_downSika seals and waterproofs at Standard Bank HQ

Although designed specifically for roofing projects, one of Sika’s internationally approved waterproofing systems was nonetheless specified for a steel water-retaining structure at Standard Bank Headquarters in Johannesburg.

keyboard_arrow_upSika treatment for townhouse complex
keyboard_arrow_downSika treatment for townhouse complex

Sikagard-703 W specified as an effective water repellent treatment at Tivoli Gardens residential complex in North Riding. Sikagard-703 W is environmentally friendly and may be over coated with water- or solvent-based polymer paints.

keyboard_arrow_upSikaSwell® hydrophilic profiles and sealants
keyboard_arrow_downSikaSwell® hydrophilic profiles and sealants

Hydrophilic joint sealing systems like SikaSwell® profiles and sealants are waterstops which can swell and are used in watertight concrete structures for systematic sealing of construction joints. 

keyboard_arrow_upSika floats Durbans boat
keyboard_arrow_downSika floats Durbans boat

Sika’s bonding, sealing and protection products were first choice for use on La Vue, the new 85ft luxurious floating restaurant now resident in Durban Harbour. 

keyboard_arrow_upSika admixtures for local low-cost housing project
keyboard_arrow_downSika admixtures for local low-cost housing project

The Highflats low cost housing project was initiated in November 2012, with a goal of constructing 2000 houses within a 24-month period.

keyboard_arrow_upSpecialised joint sealant proves its efficacy
keyboard_arrow_downSpecialised joint sealant proves its efficacy

Midvaal Water Company in Stilfontein supplies potable water in bulk to an area of some 900km2 in the North West Province.When specialised joint sealing was required at one of the company’s filter units, Sika’s Sikadur-Combiflex SG system proved its worth.

keyboard_arrow_upGreen roof solutions with Sikalastic® liquid membranes
keyboard_arrow_downGreen roof solutions with Sikalastic® liquid membranes

Green roofs present a solution in the quest for sustainability, particularly in urban developments where the emphasis is on increasing biodiversity and quality of life. 

keyboard_arrow_upFacades, fenestration and insulating glass
keyboard_arrow_downFacades, fenestration and insulating glass

Finding the right adhesive or sealant to suit a specification is critical and Sika, a world leader in bonding, sealing and reinforcing solutions, both for on-site and for industrial applications, has fine-tuned their sealing and bonding solutions for the facades, fenestration and insulating glass market.