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RockAccel 51 – Advanced Alkali-Free Accelerator for Shotcrete and Concrete Applications

Engineered for civil and underground construction, RockAccel 51 delivers rapid hydration, superior early strength development, and long-term durability. Its unique formulation ensures safer working conditions with low dust generation, reduced rebound, and compatibility with all major plasticizers, retarders, and stabilizers. Ideal for tunnels, mines, slope stabilization, shaft linings, and grouting applications, RockAccel 51 meets EN 934-5, ASTM C1141, and EFNARC standards—making it a trusted choice for high-performance sprayed concrete. With quick setting times (<6 minutes), minimal strength loss, and no negative impact on reinforcement steel or groundwater, it provides reliable performance in the most demanding environments.
Heavy-duty industrial IBC container for mining and chemical storage.

Features & Benefits

Key Features

  • Alkali-free formulation – Safe for workers, non-aggressive, and environmentally friendly.

  • Rapid setting action – Initial set in under 2 minutes, final set in under 6 minutes.

  • High durability – Maintains long-term strength with minimal performance loss.

  • Low rebound performance – When applied with the correct nozzle angle and distance.

  • Reduced dust generation – Improves on-site air quality and safety.

  • Versatile application – Suitable for tunnels, mines, slope stabilisation, shaft linings, injection grouting, and plugging mortars.

  • Wide compatibility – Works with plasticisers, retarders, and stabilisers.

  • Flexible spray thickness – Can achieve up to 150 mm overhead in a single pass.

  • Non-corrosive – No negative impact on reinforcement steel or groundwater.

  • Drycrete process ready – Performs well in both wet- and dry-mix spraying.

Benefits

  • Faster project turnaround thanks to very short setting times.

  • Improved site safety and comfort with reduced dust and non-aggressive chemistry.

  • Lower rebound = cost savings through reduced material waste.

  • Reliable strength development even under demanding conditions.

  • Eco- and steel-safe – no groundwater pollution or reinforcement damage.

  • Wide versatility makes it suitable for civil works, mining, and repair applications.