• Sika adds value to N2 Eteza Interchange Sika adds value to N2 Eteza Interchange Sika adds value to N2 Eteza Interchange Sika adds value to N2 Eteza Interchange Sika adds value to N2 Eteza Interchange Sika adds value to N2 Eteza Interchange Sika adds value to N2 Eteza Interchange
  • Sika adds value to N2 Eteza Interchange Sika adds value to N2 Eteza Interchange Sika adds value to N2 Eteza Interchange Sika adds value to N2 Eteza Interchange Sika adds value to N2 Eteza Interchange Sika adds value to N2 Eteza Interchange Sika adds value to N2 Eteza Interchange

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Sika adds value to N2 Eteza Interchange

Online since 2.02.2018 • Filed under Advertorials • From Volume 6 - 2018
Sika adds value to N2 Eteza Interchange

February 2017 saw the completion of an extensive Sika project on the newly constructed Eteza Interchange on the N2 National Route in northern KwaZulu-Natal.

 

Due to continual road damage caused by a high percentage of overloaded trucks, the South

African National Roads Agency Limited (SANRAL) resolved to construct an Overload Control Facility on the dangerous section 29 of the N2. For heavy vehicles to gain safe access to the control facility, a full diamond interchange was constructed at the junction of Road P352 and the N2.

 

Empa Structures, a division of Robex, was appointed civil contractor for all concrete aprons, the bridge over the N2 and building works. Contracted to install and apply multiple Sika products, they commenced the approximately 6200m2 project in May 2015.

 

Mortars used

Mortars used included Sikadur-43 ZA, a solvent-free,three-component, repair and filling mortar based on a combination of epoxy resins and selected high strength aggregates, and Sika Rep, a one component, cement-based multi-purpose patchingmand repair mortar. Suitable for both dry and damp surfaces, Sikadur-43 ZA provides rapid, shrinkage-free hardening and high mechanical strength as well as abrasion and impact resistance. Curing of Sikadur-43 ZA is unaffected by high humidity, an important factor in this area of KwaZulu-Natal. Easy to mix, apply and finish,

 

Sika Rep provides excellent adhesion, is shrinkage compensated and vapour permeable with a high resistance to freeze/thaw cycling. Concrete curing agents Sika concrete curing agents used were Antisol -E (3000 litres), and Antisol-15 White Pigmented Resin Based (Colta requirement) (9000 litres), both liquid curing compounds particularly useful for the prevention of water loss in large areas of exposed concrete. Supplied ready for use and simple to apply, these Antisol products reduce the incidence of plastic cracking, ensure achievement of desired strengths, minimise shrinkage, reduce dusting and increase frost resistance. Use of these compounds alleviates other costly methods of curing such as hessian-watering, which was an advantage during this project due to the extreme weather conditions in KZN, especially in summer.

Prior to filling and sealing, concrete joints were mechanically prepared using an angle grinder, then air blown and cleaned with a high-pressure water jet and allowed to dry.

 

Grouting

Grouting was done using SikaGrout-212, a onecomponent, high strength, free flowing expansive grout that is supplied as a ready to mix powder. With shrinkage compensated properties, it is non-corrosive and pre-batched for quality. Sikadur-52 ZA, a two-part, low viscosity injection liquid based on high strength epoxy resins, was used to fill and seal voids and cracks. Solvent-free and suitable for both dry and damp conditions, it not only forms an effective barrier against water infiltration and corrosion promoting media, but also structurally bonds concrete sections together. Sikadur- 52 ZA is usable at low temperatures, injectable with single component pumps and provides shrinkage-free hardening with high mechanical and adhesive strengths.

 

Silicone sealant

One of the top-quality products used was Sikasil-728 NS (727 cartridges), a non-sag, ultra-low modulus elastomeric, neutral cure, silicone sealant. Although Sikasil-728 NS met multiple international standards and environmental requirements, at the time of the project it was not a SANRAL-approved sealant, resulting in

Sika being required to provide independent test reports to prove its efficacy. Unsurprisingly, the results satisfied SANRAL technical specifications for a highway sealant. Sikasil-728 NS provides very high movement capabilities, excellent flexibility even in extreme temperatures, very good adhesion, especially to concrete and, due to its outstanding UV resistance, has an exceptionally long service life. Manual applicator joint sealant guns were used to apply this specialist product.

 

Bonding agent

As a moisture-tolerant, structural two-part bonding agent, Sikadur-32 Normal was used as a bonding agent between wet freshly placed repair mortar and old existing concrete. Based on a combination of epoxy resins and special fillers, Sikadur-32 Normal is easy to mix and apply, suitable for dry or damp concrete surfaces, hardens without shrinkage and provides very good adhesion with high bond strength as well as high initial and ultimate mechanical strength.It is impermeable to liquids and water vapour and designed for application between 10oC and 30°C.

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