Product Data Sheet Safety Data Sheet Show all documents

Sika® Sigunit® L-53 AF

Alkali-free shotcrete admixture

Sika® Sigunit® L-53 AF is a high-performance liquid, alkali-free, set accelerator for shotcrete.

Sika® Sigunit® L-53 AF has the following characteristics and advantages:
  • High early strength development
  • Alkali-free
  • Minimal strength loss of the accelerated concrete
  • No pollution of groundwater by leached out alkalis
  • Distinct reduction of rebound and dust
  • Improved bond of shotcrete to substrate
  • Chloride-free, no negative affect on reinforcement steel
Product Data Sheet Safety Data Sheet Show all documents

Usage

Sika® Sigunit® L-53 AF is suitable for both dry and wet spraying processes and it is used for:
  • Excavation stabilisation in tunnelling and mining
  • Rock, slope and trench stabilisation
  • High quality lining shotcrete
 

Advantages

Sika® Sigunit® L-53 AF has the following characteristics and advantages:
  • High early strength development
  • Alkali-free
  • Minimal strength loss of the accelerated concrete
  • No pollution of groundwater by leached out alkalis
  • Distinct reduction of rebound and dust
  • Improved bond of shotcrete to substrate
  • Chloride-free, no negative affect on reinforcement steel

Packaging

200 Litre plastic drums

1000 Litre IBC
Sigunit®-L53 AF must not be stored in standard steel containers.

Colour

Liquid, yellowish

Product Details

Product Information

Chemical Base

Inorganic aluminium complexes

Shelf Life

Three months from date of production if stored in original, unopened, undamaged and sealed containers.

Storage Conditions

Storage at temperatures between 5°C and 30°C. Protect from direct sunlight, frost and contamination. Use clean containers when delivered in bulk. Sika® Sigunit® L-53 AF must not be stored in standard steel containers.

Density

~ 1.46 kg/L

pH-Value

~ 3.0

Conventional Dry Material Content

~ 51 %

Viscosity

≤ 120 mPa s at 20°C

Total Chloride Ion Content

≤ 0.1 %

Equivalent Sodium Oxide

≤ 1.0 %

 
Technical Information

Specific Advice

Sika® Sigunit® L-53 AF is added at the nozzle. Accurate and constant dosing into the concrete flow is essential.

Concrete Mix Design

The suitability of the proposed mix design must be tested in field trials before commencement of the project. High quality shotcrete requires a w/c ratio of less than 0.5 and a flow table spread of more than 500 mm. Temperature of basic mix must be higher than 15°C.

Substrate

The substrate must be clean, free of loose stones and free of water under hydrostatic pressure.

Application

Consumption

Recommended Dosage

The correct dosage must be determined by preliminary testing. For layer thicknesses of up to 10 cm applied in one pass, the recommended accelerator dosage is between 4 % and 7 % by weight of binder. Lower ambient and basic mix temperatures require higher dosage of accelerator.

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