Arboretum Reservoir


The Arboretum Reservoir was built in 1980 and is ± 45 megaliters. It is situated in Albrecht Street, Bloemfontein.

Engineers, GIBB, specified Sika’s acclaimed Sikaflex Pro-3 i-cure for reseal of all joints and Sikadur-Combiflex SG Bandage system for the final stages of the project in completing the roof joints. Full on-site support was undertaken by Sika’s Area Sales Manager, Stephan Fourie, where the contractor, MCS was well informed about product performance, correct application methods and technical data.        

The project had commenced in August 2017 and was completed towards the end of October 2017. The requirements of the project was waterproofing the roof of the reservoir using a proven high quality system to prevent the unit from leaking.

Sika is relied upon for its innovation and consistency in the field of construction, especially when it comes to the sealing of large structures such as this reservoir. For this application, Sikaflex PRO-3 i-cure,a high performance, elastic joint sealant, was specified for sealing all floor joints. It is suitable for contact with drinking water and Conforms to BS 6920(drinking water contact). It is solvent-free and odourless with very low emission, Sikaflex PRO-3 i-cure provides a very high movement capability, high mechanical and chemical resistance and bubble-free curing. Further waterproofing and damp-proofing of the inner walls, columns and floor were
achieved using SikaTop Seal-107 ZA, a two-part, mortar slurry comprising a
liquid polymer and a cement based mix incorporating special admixtures.

The Sikadur-Combiflex Bandage System was used to seal the reservoir roof joints in the last stages of the project. This is a high performance joint sealing bandage system consisting of a flexible TPO waterproofing tape and Combiflex epoxy adhesive, in this case Sikadur-31 DW.

The Sikadur-Combiflex SG bandage System is employed primarily in the construction of water retaining structures and reservoirs. As a highly specialised waterproofing system, it is used for expansion and connection joints as well as for cracks; when fixed to the joint, it allows irregular and high movement in more than one direction, whilst maintaining a high quality seal. It is used for sealing high movement and irregular joints and cracks where the use of conventional sealing techniques is not possible.

For the refurbishment of all exposed reinforced concrete in the reservoir, two of Sika’s high quality products were specified. SikaTop Armatec-110, which was used as a bonding agent for the repair mortar, Sika MonoTop-612. SikaTop Armatec 110 EC is a cement-based, epoxy-modified, anti-corrosion coating and bonding agent for use on concrete, mortar or steel and as a protective coating for reinforcement steel embedded in concrete to prevent corrosion. It contains corrosion inhibitors, offers excellent adhesion to steel and concrete, and acts as a barrier against penetration of water and chlorides. and Sika MonoTop-615 HB, a high build polymer modified repair and reprofiling mortar, was then applied.

Various challenges were evident when assessing the concrete roofs but Sika had the right product for a seamless watertight solution that wouldn’t let the contractor down. Sikalastic-560, a one-component, liquid applied waterproofing membrane wa specified to particular areas of the roof. This product allowed the contractor to stick within the budgetary constraints as well as provide the desired outcome.