MACt GFRC Premix – Silica Free is an innovative, ultra-high-performance concrete mix designed to replace traditional GFRC premixes without compromising quality or versatility. Manufactured in MACt’s Queensland facility, this shrinkage-compensated, fibre-reinforced blend eliminates silica content to minimise health risks while delivering the same exceptional strength, durability, and workability that GFRC applications demand. Perfect for architectural cladding, furniture, décor, or custom projects, this premix strikes an ideal balance between safety, performance, and cost-effectiveness.

Key Features & Benefits

1. Silica-Free & Safe
   • Worker Health & Safety: Minimises the risk of silicosis and other health issues by eliminating silica dust.
   • Regulatory Compliance: Ideal for large construction sites or environments with tight dust control requirements.
2. Ultra High-Performance
   • High Early Strength: Rapid development of mechanical properties, enabling shorter demould times.
   • Low Permeability & Enhanced Durability: Dense microstructure resists damage from freeze-thaw cycles, chemicals, and harsh weather.
3. Versatile & Cost-Effective
   • Multifunctional: Suited for architectural features, facades, furniture, landscaping, industrial uses, and more.
   • Labour & Time Savings: Lightweight mix reduces handling and transport costs while simplifying installation.
4. Shrinkage-Compensated
   • Gaseous Expansion System: Offsets settlement in the plastic stage, minimising cracking and warping.
   • Consistent Results: Standardised, ready-to-use formulation lowers risk of on-site mixing variability.
5. Superior Workability
   • Wide Range of Methods: Suitable for pouring, pumping, spraying, or trowelling, even in complex forms.
   • Customisation Options: Easily coloured with integral pigments and adaptable with different fibres or additives.

Recommended Uses

• Architectural Elements & Facade Cladding
  • Create sleek, modern façades or intricate decorative pieces requiring both aesthetic appeal and durability.
• GFRC Furniture & Décor
  • From countertops to lounge seating and planters, build lightweight yet strong pieces with ease.
• Pools, Spas & Water Features
  • Resistant to moisture, chemicals, and freeze-thaw cycles, ensuring long service life.
• Fireplaces & Fire Pits
  • Excellent heat resistance and non-combustible properties suit high-temperature applications.
• Industrial & Custom Projects
  • Ideal for varied demands, including modular building, artificial reefs, or heavy-duty infrastructure components.

Mixing Instructions & Tips

1. Safety First
   • Personal Protective Equipment (PPE): Wear a mask, safety glasses, and gloves; work in a well-ventilated area.
   • Prevent Dust Inhalation: Although silica-free, fine powders can still be irritating—handle carefully.
2. Ingredient Preparation
   • Accurate Weighing: Gather water, premix, fibres, plasticiser, colour (if needed), and any additives in the recommended proportions.
   • Dry-Mix: Combine premix, colour, and plasticiser beforehand to avoid clumping and ensure even dispersion.
3. Water & Premix Addition
   • 80% First: Pour 80% of the premix blend into the water, mixing thoroughly. Scrape sides and bottom to incorporate all material.
   • Remaining 20%: Add the rest of the premix and continue blending until homogeneous. Adjust consistency only with plasticiser.
4. Fibre Incorporation
   • Final Step: Add fibres to the fully mixed base; ensure thorough distribution for optimal reinforcement.
   • Avoid Extra Water: Water addition dilutes strength and alters colour, so rely on plasticiser for flowability adjustments.
5. Example Flowable Mix
   • MACt SF Premix (20 kg): 2.9 L water, 60 g plasticiser, 40 g 3 mm HD fibres, 350 g 13 mm bundled fibres, 15 g MACt Retarder Pro (if needed).

Demoulding & Curing

1. Tap Test
   • Sound Progression: Listen for a crisp, metallic tone indicating a higher degree of cure and readiness for safe demoulding.
2. Surface Moisture
   • Matte Finish: A drier, less glossy appearance suggests the GFRC is sufficiently cured to handle without cracking.
3. General Timeline
   • Minimum 24 Hours: Typical recommended cure before demoulding; adjust as needed based on project conditions.
   • Monitor & Evaluate: Combine visual and tap tests for the most accurate assessment of curing progress.

Technical Highlights

• Ultra High-Performance: Developed specifically for applications demanding robust mechanical properties and dimensional stability.
• No Metallic Iron: Ensures no unsightly rust staining, even in damp or coastal environments.
• Compatible with MACt Additives: Optimised in synergy with MACt Plasticiser, Retarder Pro, or other admixtures for tailored flow, set, or strength profiles.

Why Choose MACt GFRC Premix – Silica Free?

• Health-Conscious: Eliminates silica dust hazards, aligning with strict safety protocols.
• Consistently High Quality: Overseen by rigorous manufacturing and QC standards at MACt’s Queensland facility.
• Flexible Design Freedom: Mould, shape, or cast into detailed forms with minimal risk of cracking or shrinkage.
• Long-Term Durability: Maintains structural integrity under harsh environmental or load-bearing conditions.

MACt GFRC Premix – Silica Free represents a significant leap in healthy, high-performance concrete solutions. Combining all the advantages of traditional GFRC—lightweight, high strength, superior durability—with a silica-free formula, it caters to the modern demand for safer, user-friendly construction materials. Whether your project calls for intricate architectural details or robust industrial components, this premix ensures consistent results, eco-friendliness, and top-tier performance in one streamlined package.