Shotcrete & Tunnelling
Underground, sprayed concrete has to grip overhead rock and gain strength fast enough to support ground that will not wait. Accelerators and admixtures make that possible.
Applied in order.
- On demand
Sika® Sigunit® Powder BAShotcrete Admixtures · verified TDS - On demand
Sika® Sigunit® SA 540Shotcrete Admixtures · verified TDS
Set accelerators dosed at the nozzle flash-set the sprayed concrete so layers build overhead without sloughing, and early strength develops on the schedule ground support demands. The base mix uses superplasticizers for pumpability, and dosing balances build thickness against final strength, verified through the panel tests standard in tunnelling work.
Built for the job, not the shelf.
- Overhead build without sloughing
- Early strength on the ground-support schedule
- Pumpable base mixes for long lines
- Dosing adjustable to changing ground at the nozzle
Asked on real sites.
Alkali-free accelerator, does it matter?
Modern alkali-free grades protect crews and long-term strength compared with older chemistry. The TDS states dosage windows and strength effects.
How is early strength verified underground?
Panel sprays and penetration or stud tests against the required strength-time curve. We can point your team to the standard procedure.
Does accelerator reduce final strength?
High dosages trade some final strength for speed, which is why dosing stays inside the TDS window and the mix design accounts for it.
- Verified dataDatasheets checked against the official Sika Pakistan PDS
- Site supportApplication questions answered by phone, WhatsApp or visit
- Live availabilityStock status on this page updates from our platform
- DeliveryContact our team to confirm delivery and lead times to your location.
Planning this job? Talk it through first.
Send us the site details on WhatsApp and get the right sequence, coverage quantities and a quotation for the full system.