MasterFlux 881 Ultra Rapid Strength Micro Concrete 20kg

MasterFlux 881 is a C Class dual shrinkage-compensated, pourable micro concrete designed for time-critical civil engineering applications. Utilizing specialized cementitious powders, blended aggregates, and advanced additives, MasterFlux 881 delivers exceptionally rapid compressive strength development without compromising long-term durability or structural integrity.

Key Features & Benefits:

• Ultra-Rapid Strength Gain: Reaches up to 20 MPa in just 2 hours (at 2.0L water addition) for fast turnarounds and rapid load resumption.

• Fast Setting: Initial set in 25 minutes and final set in 40 minutes—perfect for night works, shutdowns, and emergency repairs.

• Dual Shrinkage Compensated: Provides exceptional dimensional stability to drastically reduce cracking risks.

• Marine & Submerged Performance: Specifically formulated for structural repairs in aggressive marine environments, tidal zones, and underwater applications.

• High Flowability: Smooth, pourable consistency allows easy placement into congested, heavily reinforced, or hard-to-reach areas.

• Agitator Ready: Blended fine aggregate allows for batch mixing in agitators for large-volume pours.

Recommended Applications:

• General repairs in concrete structures (dynamic beams, columns, overheads, and slabs)

• Marine environment, tidal zone, and underwater concrete repairs

• Airport runway repairs and lighting installation grouting

• Precast concrete grouting

• High-volume structural pours using transit agitators

Quick Technical Specs:

• Packaging: 20kg Bag

• Water Addition: 2.0 – 2.4 Litres per 20kg bag (10% - 12%)

• Yield: Approx. 9.5 – 9.9 Litres per bag

• Application Thickness: 10mm – 100mm (or >100mm with aggregate extension)

• Initial / Final Set: 25 mins / 40 mins

• Compressive Strength (at 2.0L water):

  • 2 Hours: 20 MPa

  • 24 Hours: 60 MPa

  • 28 Days: 90 MPa