Product Data Sheet Show all documents

Sika® Sigunit® L

Liquid shotcrete accelerating admixture for the wet spray process

Sika® Sigunit® L is a liquid cohesion agent and a rebound reducer for the wet spray method with momentary gluing effect.

Sika® Sigunit® L produces increased internal cohesion and adhesion of shotcrete.
  • Thick layers can be applied in one application
  • Improves adhesion of the shotcrete to walls, rock formations and concrete and thus facilitates overhead application of shotcrete
  • Makes it possible to produce a high strength and dense shotcrete
  • Easy handling
  • Improves watertightness
  • Improves adhesion to substrate and reduces rebound and dust production
  • Reduces the required layers and increases their width
  • Chloride free, does not attack or corrode iron or steel reinforcement
The accelerator’s effect depends on the cement content, type and age, substrate temperature and type, shotcrete temperature, layer thickness and spray process / equipment. The water/cement ratio of the basic concrete mix is another important parameter which influences the acceleration effect of Sika® Sigunit® L.
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    Product Data Sheet Show all documents

    Usage

    Sika® Sigunit® L accelerates setting of concrete in applications such as:
    • Fixing rocks and slopes
    • Lining in tunnels, canals, e.t.c.
    • Underground structures
    • Repairs
    • Slope configuration
    • Water tanks
    • Construction pits and sub-terranean excavations
    • Rock and soil stabilisation
     

    Advantages

    Sika® Sigunit® L produces increased internal cohesion and adhesion of shotcrete.
    • Thick layers can be applied in one application
    • Improves adhesion of the shotcrete to walls, rock formations and concrete and thus facilitates overhead application of shotcrete
    • Makes it possible to produce a high strength and dense shotcrete
    • Easy handling
    • Improves watertightness
    • Improves adhesion to substrate and reduces rebound and dust production
    • Reduces the required layers and increases their width
    • Chloride free, does not attack or corrode iron or steel reinforcement
    The accelerator’s effect depends on the cement content, type and age, substrate temperature and type, shotcrete temperature, layer thickness and spray process / equipment. The water/cement ratio of the basic concrete mix is another important parameter which influences the acceleration effect of Sika® Sigunit® L.

      Packaging

      200L drums

      1,000L IBC tankers

      Colour

      Colorless liquid

      Product Details

      Sustainability / Certifications / Approvals

      APPROVALS / CERTIFICATES

      • CE Marking and Declaration of Performance according to EN 943-5 - Sprayed concrete set accelerating admixture, T.2
      Product Information

      Composition

      Modified silicate

      Shelf life

      12 months from date of production

      Storage conditions

      Sika® Sigunit® L must be stored in undamaged and unopened, original sealed containers.

      Sika® Sigunit® L has a reaction in contact with atmospheric humidity [moisture] or rain, e.t.c. and must therefore always be stored in sealed containers. Sika® Sigunit® L should only be decanted into clean containers. Avoid air entrapment. Filling through floor inlets or immersed pipes is best. Containers must always be properly sealed.

      Do not store in aluminium tanks.

      Protect from extreme cold.

      Note: Once containers are opened, use the material as quickly as possible.

      Density

      1.4 ± 0.03 kg/lit

      pH-Value

      12 ± 1

      Total chloride ion content

      Free (EN 934.01)
      Technical Information

      Specific advice

      Ambient Temperature: Above +1°C

      Concrete mix design

      Pump granulometry:
      Normal max. particle size 8 mm to 16 mm.

      Concrete consistency (dependent on spray equipment):
      Concrete flow 45 cm; W/C 0,48.

      A suitable flow agent is required (e.g. Sika® ViscoCrete® series).

      Fresh concrete temperature: > +15°C.

      For better system performance, the use of mixtures with low W/C ratios (<0,50) in combination with compatible Sika® ViscoCrete® superplasticizers is recommended. In case of demands for higher pumpability, the use of Sika® Visco I-100 will give exceptional results.

      Reduction in cement quantity can be achieved, with use of suitable Sika admixtures and appropriate mix design.

      Application

      Application Information

      Compatibility

      The following Sika products are generally used to improve the performance or the application properties of the basic concrete mix:

      • Sika® ViscoCrete® series
      • SikaTard®-930
      • Sika® Visco I-100
      • SikaFume® HR-E / Sikacrete® AR
      • Sika-Air® Fine

      Trials are recommended before combining products.
      Consumption

      Recommended dosage

      3% - 8% by weight of binder.

      The correct dosage must be determined by preliminary testing.

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