Sika® Sigunit® L-72 AF
LIQUID ALKALI-FREE SHOTCRETE ACCELERATOR
Sika® Sigunit® L-72 AF is a high performance, alkali-free liquid set accelerator for shotcrete applications.
- High early strength development
- Alkali- and chloride-free
- No pollution of groundwater by leaching of alkalis
- Distinct reduction in rebound.
- Improves bond of shotcrete to rock and concrete thus facilitating overhead spraying
- Distinct reduction of dust
Usage
Sika® Sigunit® L-72 AF is suitable for both dry and wet spraying processes and it is used for:- Support at the face while advancing tunnels and mines
- Rock and slope stabilization
- High quality lining shotcrete
Advantages
- High early strength development
- Alkali- and chloride-free
- No pollution of groundwater by leaching of alkalis
- Distinct reduction in rebound.
- Improves bond of shotcrete to rock and concrete thus facilitating overhead spraying
- Distinct reduction of dust
Packaging
205 L (54 US gal.) drum
1040 L (275 US gal.) IBC
Bulk delivery
Colour
Liquid / Translucent to white
Product Details
Shelf Life
6 months when stored in unopened original containers, protected from direct sunlight and frost and kept at temperatures between +10 °C and +30°C (50 °F and 86 °F).
Storage Conditions
Store in stainless steel or plastic container as the low pH of the admixture may cause corrosion if stored in normal steel container, which might affect the performance of the admixture. Protect from direct sunlight, heat and frost. If these conditions are unattainable, Sika® Sigunit® L-72 AF may precipitate. If this occurs, the performance of Sika® Sigunit® L-72 AF may be adversely effected. Contact your Sika Canada Technical Sales Representative.
Specific Gravity
Approx. 1.4
Application
Compatibility
Sika® Sigunit® L-72 AF is compatible with Sika’s water reducing, high range water reducing, hydration control admixtures and other admixtures. Trials with local materials is always recommended to verify performance.
Mixing
Mixing / Dispensing: Sika® Sigunit® L-72 AF is dosed and added on-site by a liquid dispensing system. Optimum dispersion in the shotcrete is governed by nozzle configuration and shotcreting techniques.Use of Sika® Sigunit® L-72 AF requires the technically correct installation of dosing and conveying equipment.
Restrictions
- Concrete temperature should not be lower than +15°C (59 °F) when shotcreting in thick layers - 100 mm (4 in) and above
- Metal components that come into direct contact with the product should be fabricated of stainless steel. Do not use brass parts.
- The performance of the Sika® Sigunit® L-72 AF will vary according to water/cement ratio of the mix, materials used, ambient conditions, shotcrete methods used and the requirements of a specific project.
- The effect of Sika® Sigunit® L-72 AF depends on cement type, age, content and the nature of subgrade.
Recommended Dosage
Dosage
For general applications Sika recommends a dosage between 4-8 % by weight of the total cementitious content. Dosage rates outside the recommended range may be used where specialized materials such as microsilica are specified, extreme ambient conditions are encountered or unusual project conditions require special consideration. In this case, contact your Sika Canada Technical Sales Representative.
Remark: The most effective dosage must be determined by trial.
