Product Data Sheet Show all documents

Sika® Sigunit®-59 AF

Powdery alkali-free setting accelerator for shotcrete

Sika® Sigunit®-59 AF is an alkali-free setting accelerator for dry-mix shotcrete in powder form.

  • Alkalifree fast cement setting
  • Especially for CO2 reduced cement
  • Minimum strength loss in the spray concrete
Sika® Sigunit®-59 AF
Safety Data Sheet
Product Data Sheet Show all documents

Usage

Sika® Sigunit®-59 AF is especially formulated for use as setting accelerator in Portland and Portland composite cement based mortars and concrete. The product is particularly suitable for:
  • Applications, where high initial strength is needed and/or the shotcrete must play a supporting role in the early stage
  • Dry-mix shotcrete for tunnel repairs, heading stabilization in tunneling, slope and trench stabilization, etc.
  • Processing in thin-flow process
 

Advantages

The benefits of Sika® Sigunit®-59 AF include, but are not limited to the following:
  • Very effective in Portland and Portland composite cement based systems, such as CEM II/B-M (S-T)
  • Low dosage
  • Fast cement setting
  • High early strength development of shotcrete
  • Lower rebound during application
  • Improved bond of shotcrete to rock and concrete, making overhead spraying easier
  • Minimum strength loss in the accelerated concrete
  • Sika® Sigunit®-59 AF is non corrosive to steel reinforcement
  • Alkali-free, which eliminates any adverse effects from additional alkali in the spray dust
  • No additional surface and ground water pollution by leached-out alkali

Packaging

20 kg bags, 800 kg on pallet; 1000 kg BigBag

Colour

White powder

Product Details

Sustainability / Certifications / Approvals

APPROVALS / CERTIFICATES

Confirms to the requirements of EN 934-5, Table 2 (Non-alkaline sprayed concrete accelerator)
Product Information

Composition

Mineral based, alkali-free powder

Shelf life

24 months shelf life from date of production if stored dry and properly in undamaged, unopened, original sealed packaging.

Storage conditions

Dry storage at temperatures up to 30 °C. Protect from direct sunlight.

Bulk Density

Approx. 0.90 g/cm3

pH-Value

Approx. 3 (100g/l H2O)

Total Chloride Ion Content

≤ 0.10 %
Technical Information

Specific Advice

The acceleration effect is dependent on the cement (content, type and age), the shotcrete and substrate temperatures, layer thicknesses and the spray process. In dry spraying, the quantity of mixing water is an important criterion, also relevant for the accelerating effects of Sika® Sigunit®-59 AF.
When applying shotcrete in thicker layers, make sure that the temperature of the basic concrete is not below +15°C. Lower temperatures require a higher dosage of the accelerator.
Support from our Technical Services Department is recommended.

Application

Application Information

Compatibility

Sika® Sigunit®-59 AF may be combined with Sika ViscoCrete Powders for water reduction.
Important: Always conduct trials before combining products in specific mix designs and contact our Technical Services Department for any additional information and advice concerning specific combinations with other products.

Dispensing

Sika® Sigunit®-59 AF is added to the dry mix in the drymix mortar plant. Alternatively, it can be added to the dry mortar/concrete premix at the construction site prior to feeding the spray equipment (rotor machine).
Consumption

Recommended Dosage

Typical dosage in the range of 2 to 6 % of the binder weight. The maximum dosage should not exceed 6 % of the binder weight. The water-binder ratio should be below 0.5 to ensure durability and ultimate strength required. The addition of water-reducing additives (Sika® ViscoCrete® Powder) is recommended.
Note: Preliminary testing is required to determine the exact dosage for your specific conditions. Please contact our Technical Services Department for more information and advice

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