Product Data Sheet Show all documents

Sika® Sigunit® SA 160

(former MRoc SA 160)

Shotcrete accelerator

Sika® Sigunit® SA 160 is a liquid, high-performance, alkali-free set accelerator for sprayed concrete, whose dosage can be varied to the desired setting and hardening times. Suitable for use in hot and tropical climatic conditions.

Sika® Sigunit® SA 160 is ideally suited for wet mix sprayed concrete for ground support:
  • The quick setting property allows rapid work progress and the ability to construct thick sprayed concrete linings via layered application during one construction sequence.
  • The product formulation provides fast setting, continuous early-age strength development high durability and enhanced long term strength.
  • Very low dust generation during application and therefore a good working environment.
  • Possibility of low rebound applications when using the correct nozzle angle and distance.
  • Non-aggressive properties provide improved working safety, reduced environmental impact and lower handling costs.
Product Data Sheet Show all documents

Usage

  • Temporary and permanent ground support in tunneling and mining.
  • Slope stabilisation.
  • Suitable for acceleration of cementitious grouts, such as for annulus grout in TBM tunnels, cemented ground injection and foam concrete.
 

Advantages

Sika® Sigunit® SA 160 is ideally suited for wet mix sprayed concrete for ground support:
  • The quick setting property allows rapid work progress and the ability to construct thick sprayed concrete linings via layered application during one construction sequence.
  • The product formulation provides fast setting, continuous early-age strength development high durability and enhanced long term strength.
  • Very low dust generation during application and therefore a good working environment.
  • Possibility of low rebound applications when using the correct nozzle angle and distance.
  • Non-aggressive properties provide improved working safety, reduced environmental impact and lower handling costs.

Packaging

Drums, 1,000 L flowbin or in bulk

Colour

Beige liquid

Product Details

Product Information

Composition

Blend of special inorganic materials

Shelf life

6 months from date of production if stored properly

Storage conditions

  • Must be stored at minimum +5°C and maximum +35°C (optimum temperature for storage and performance +20°C).
  • Has to be kept in closed containers made of plastic, glass fiber or stainless steel.
  • Must not be stored in normal steel containers.
  • Storage in bulk tanks requires the use of agitation and / or circulation systems.
  • After prolonged storage or transport we recommend to fully agitate it prior to use by mechanical stirring or re-circulation pumping.
  • Please contact your local Sika technical representative prior to the use of any product that has been frozen.
  • After prolonged storage, performance testing should always be carried out before use.

Density

~1.43 kg/l (+25 °C)

Viscosity

> 200 mPa.s (Brookfield, + 20°C. Viscosity is dependent on degree of product agitation and temperature)

pH-Value

2.1 – 3.1

Total chloride ion content

Nil

(EN 480-10)

Equivalent sodium oxide

< 1.0 % by mass

(EN 480-12)
Technical Information

Concreting guidance

The following results should be taken as a performance guide only:


Initial set             Final set            24h Strength        Rating
2 min.                   6-8min.               18-20 MPa             Good
5 min.                   8-12 min.            12-15 MPa              Ok

>10 min.               > 15 min.             <10 MPa                Poor

Concrete mix design

When Sika® Sigunit® SA 160 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 160 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 160 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 160 with the above products or other admixtures. Please consult our Sika Technical Department.
Consumption

Recommended dosage

3–10 % 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 should be clean and free from loose particles and preferably damp.

CLEANING OF EQUIPMENT

After the use of Sika® Sigunit® SA 160, 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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