Product Data Sheet Show all documents

Sika® Sigunit® SA 430

(former MRoc SA 430)

Liquid sprayed concrete accelerator for wet-mix spraying

Sika® Sigunit® SA 430 is an accelerator for the wet-mix spraying process but can also be used in the dry-mix spraying process. It is a liquid additive whose dosage can be varied to the desired setting and hardening times. Suitable for use in hot and tropical climatic conditions.

  • Fast setting and higher early strength
  • Rapid word progress
  • Low viscosity
  • Easy to mix into the concrete (even at low temperatures)
  • Low consumption
Product Data Sheet Show all documents

Usage

Sika® Sigunit® SA 430 is suitable for all applications where high early strength and very thick sprayed concrete layers are required.
  • For temporary ground support in tunneling and mining
  • Slope stabilization
 

Advantages

  • Fast setting and higher early strength
  • Rapid word progress
  • Low viscosity
  • Easy to mix into the concrete (even at low temperatures)
  • Low consumption

Packaging

Drums, 1,000 L flowbin or in bulk

Colour

Clear to whitish liquid

Product Details

Product Information

Composition

Blend of special inorganic materials

Shelf life

12 months from date of production if stored properly

Storage conditions

Store in undamaged, unopened, original sealed packaging in dry conditions at temperatures between +5°C and +50°C. 

Density

~1.36 kg/l (+25 °C)

Viscosity

30–70 mPa.s (cps) (+20°C)

Total chloride ion content

Nil

(EN 480-10)
Technical Information

Concrete mix design

When Sika® Sigunit® SA 430 is used for wet mix spraying, it is advised to have the w/c ratio < 0.45.

When targeting extremely high early strength, it is preferable to have w/c ratio  ≤ 0.40.

The lower w/c ratios provide faster setting, higher early strength, better durability and lower accelerator dosage; moreover, it allow for thicker layers to be applied overhead.

 

Application

Application Information

Dispensing

Sika® Sigunit® SA 430 is added at the nozzle. It is essential to have a constant and accurate dosage of accelerator into the concrete stream. To ensure quality sprayed concrete, follow the pump selection guidelines given below:


Works very well with:

  • Mono pumps (stator & rotor pumps)
  • Peristaltic pumps


Should not be used with:

  • Piston pumps
  • All pumps with ball and seat valves
  • Pressure tanks
  • Gear pumps

Do not use a filter on the suction hose as this causes obstructions. Preferably draw the material off the bottom of the drum/container.

Compatibility

Sika® Sigunit® SA 430 is compatible with the following Sika products:
SikaPump®, Sika® ViscoCrete®, Sikament®, SikaFume®, SikaFiber®, SikaTard®
We recommend to perform trial mixes to establish the required performance when combining Sika® Sigunit® SA 430 with the above products or other admixtures. Please consult our Sika Technical Department.
Consumption

Recommended dosage

3–8 % by weight of binder

Dosages by weight of binder depend on the mix design, raw materials, climatic conditions and concrete requirements.
Trial mixes must be performed to establish the exact dosage rate required.
Application steps

SUBSTRATE PREPARATION

The substrate must be clean and free from loose particles and preferably damp.

CLEANING OF EQUIPMENT

After the use of Sika® Sigunit® SA 430, the dosing pump and other parts of the system must be thoroughly cleaned with plenty of water. Failure to do so
provokes blockages in the dosing system when next used.

 

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