Product Data Sheet Show all documents

Sika® Sigunit®-5460 AFL

(former MasterRoc® SA 160)

LIQUID ALKALI-FREE SET ACCELERATOR FOR SHOTCRETE

Sika® Sigunit®-5460 AFL is an alkali-free set accelerator for sprayed concrete. It is a liquid admixture whose dosage can be varied to the desired setting and hardening times.

  • High early strength development
  • Minimal strength loss of the accelerated concrete
  • No pollution of groundwater by leached out alkalis
  • Distinct reduction of rebound and dust
  • lmproved bond of shotcrete to the substrate
  • Chloride-free, no negative affect on reinforcernent steel
Product Data Sheet Show all documents

Usage

Sika® Sigunit®-5460 AFL is suitable for both dry and wet spraying processes and it is used for:
  • Excavation stabilization in tunnelling and mining
  • Rock, slope and trench stabilization
  • High quality lining shotcrete
 

Advantages

  • High early strength development
  • Minimal strength loss of the accelerated concrete
  • No pollution of groundwater by leached out alkalis
  • Distinct reduction of rebound and dust
  • lmproved bond of shotcrete to the substrate
  • Chloride-free, no negative affect on reinforcernent steel

Packaging

Bulk supply, IBC

Colour

White to beige suspension

Product Details

Product Information

Chemical Base

lnorganic aluminium complexes

Shelf Life

6 months from date of production if stored in original, undamaged and sealed containers

Storage Conditions

Storage at temperatures between 5 °C and 35 °C. Application temperature should be 15 °C, preferably 20 °C or higher. Protect from direct sunlight, frost and contamination. Use clean containers when delivered in bulk. ln case of separation of Sika® Sigunit®-5460 AFL the suspension has to be homogenised before use. Sika® Sigunit®-5460 AFL must not be stored in standard steel containers.

Density

~ 1.43 kg/l

Solid content by weight

~ 53 %

Viscosity

< 400 mPas at 20 °C

pH-Value

~ 2.5

Total Chloride Ion Content

< 0.1 %

Equivalent Sodium Oxide

< 1.0 %
Technical Information

Specific Advice

Sika® Sigunit®-5460 AFL 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. Flow table spread must be more than 500 mm. High quality shotcrete requires a w/c ratio of less than 0.5, in special cases even 0.4 or below. For good performance a basic mix temperature of at least 15 °C is recommended (EFNARC recommendation).

Application

Consumption

Recommended Dosage

The correct dosage must be determined by preliminary testing under site conditions. Changing cement and fresh concrete properties must be considered. Lower temperatures require usually higher accelerator dosages. Depending on the purpose and on the conditions, the recommended dosage is between 3 % and 10 % by weight of binder. Sika® Sigunit®-5460 AFL can be sensitive to the type of cement. With some cements the setting characteristics can be too slow. In all cases, it is strongly recommended to carry out preliminary tests to check setting and the 24 h strength of the concrete planned for use in a project.
Application steps

SUBSTRATE QUALITY

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

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