Product Data Sheet Show all documents

Sika® Sigunit® L-535 AF

ALKALI FREE LIQUID ACCELERATOR SHOTCRETE ADMIXTURE

Sika® Sigunit® L-535 AF is a high-performance, liquid, alkali-free shotcrete accelerator.

Particularly outstanding advantages of Sika® Sigunit® L-535 AF shotcrete accelerator are:
  • Alkali-free
  • If correctly used, marginal loss of strength of the shotcrete
  • No added pollution to mountain water and underground water by leached-out alkalis
  • Distinctly visible reduction of dust formation
  • Easier overhead spraying by improved shotcrete adherence to rock and concrete
  • Chloride-free, does not attack steel
Product Data Sheet Show all documents

Usage

Sika® Sigunit® L-535 AF is a suitable set-accelerator for wet-process shotcreting. The main fields of application for Sika® Sigunit® L-535 AF are:
  • Securing of rock in tunnel mine construction
  • Rock support and slope protection
  • High-quality lining shotcrete
 

Advantages

Particularly outstanding advantages of Sika® Sigunit® L-535 AF shotcrete accelerator are:
  • Alkali-free
  • If correctly used, marginal loss of strength of the shotcrete
  • No added pollution to mountain water and underground water by leached-out alkalis
  • Distinctly visible reduction of dust formation
  • Easier overhead spraying by improved shotcrete adherence to rock and concrete
  • Chloride-free, does not attack steel

Packaging

200 L drums

1000 L bulk

Colour

Liquid / Whitish Colour

Product Details

Product Information

Composition

Inorganic substance

Shelf life

6 months from the date of production if stored properly in original, unopened and undamaged sealed packaging in dry conditions.

Storage conditions

Store in shaded area, protect from direct sunlight.

Density

at +20 °C

1.40 - 1.45 kg/L
System information

Compatibility

Use of suitable superplasticiser (such as Sika Viscocrete® SC series) and setting stabilizer (such as SikaTard®-930) is strongly recommended. For specific application, additional admixtures / additives can be used, for example:

  • SikaPump® for demanding pumping situations
  • SikaFume® for high strength, low rebound spray
Technical Information

Concreting Guidance

  • The water cement ratio for mixing concrete should preferably be less than 0.45. The lower the water cement ratio, the better the results obtained will be, including lower dosage of Sika® Sigunit® L-535 AF
  • Concrete temperature should not be lower than +15 °C (especially so for thick layers). Lower temperatures require higher dosages.

 

Application

Application Information

Dispensing

  • The exact dosage must be determined by preliminary testing. For layers up to 15 cm thickness in 1 pass the dosage is in the range of 4 – 6 % by weight of the binder cement. Sika® Sigunit® L-535 AF is dosed by means of a peristatic pump such as Aliva AL-403
  • Optimal atomisation of Sika® Sigunit® L-535 AF and its mixing with the shotcrete mix must be ensured
Consumption

Recommended Dosage

In general a dosage 3 - 7 % by weight of cement.
The most effective dosage must be determined by site trials.

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