MACt Shrinkage Reducing Admixture (10kg)

MACt Shrinkage Reducing Admixture

$291.50 Inc GST

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MACt Shrinkage Reducing Powdered Admixture is a specialised formula designed to mitigate shrinkage cracking in concrete and GFRC (Glass Fibre Reinforced Concrete). By adjusting the rate of hydration, strengthening the final product, and enhancing workability, this admixture serves as a critical component for contractors and DIY enthusiasts seeking high-quality, durable finishes. Ideal for decorative or heavy-use applications, MACt Shrinkage Reducing Admixture helps achieve smoother, more consistent surfaces—free from unsightly cracks or blemishes.

Key Features & Benefits

  1. Reduced Shrinkage Cracking
    • Hydration Control: Slows the drying process, minimising the volume changes that cause shrinkage.
    • Consistent Finish: Helps achieve smoother surfaces with fewer cracks and defects.
  2. Enhanced Strength & Durability
    • Chemical Compounds: Increases resistance to environmental stressors like temperature fluctuations or humidity.
    • Extended Product Lifespan: Reinforced concrete/GFRC withstands daily wear, ultimately reducing maintenance costs.
  3. Improved Workability
    • Easier Pour & Finishing: Produces a more user-friendly mixture, beneficial for both professionals and hobbyists.
    • Versatile Applications: Suitable for decorative elements, high-traffic surfaces, or intricate mould work.
  4. Superior Appearance
    • Minimal Cracking: Fewer blemishes and a more uniform look, particularly valuable for decorative or highly visible projects.
    • Professional Results: Achieves consistent colour and texture across the entire surface.

Recommended Usage & Dosage

  • Dosage Range: 0.5–5% of total cementitious content, equivalent to 50–500g per 20kg premix.
  • Optimal Concentration: Varies based on mix design and project requirements; test accordingly for best results.
  • Mixing Procedure: Add admixture to the water prior to introducing cementitious materials, ensuring even dispersion throughout the batch.

How it Works

  1. Altering Hydration Rate
    • Admixture ingredients regulate how quickly cement hydrates, reducing internal stresses that lead to cracking.
  2. Strengthening Final Product
    • Special chemical compounds fortify the concrete or GFRC, yielding a robust, long-lasting material.
  3. Improving Workability
    • Enhances flow and consistency, making the mixture easier to place, shape, and finish—especially vital for detailed or large-scale pours.
  4. Aesthetic Advantages
    • Creates a smoother surface, free of hairline cracks or unsightly blemishes, enhancing overall visual appeal.

Storage & Handling

  • Container Integrity: Keep sealed in its original packaging in a dry, temperature-controlled environment.
  • Shelf Life: Properly stored, the product retains effectiveness for an extended period; consult packaging for specific guidance.
  • Safety Precautions: Follow SDS guidelines, use protective equipment when handling and mixing to ensure a safe worksite.

Why Choose MACt Shrinkage Reducing Powdered Admixture?

  • Reliable Shrinkage Control: Minimises cracking through precise management of concrete or GFRC hydration.
  • Versatile Adaptation: Suitable for diverse applications—from decorative finishes to structural elements.
  • Improved Aesthetics: Produces a cleaner, more uniform surface across the final product.
  • Longevity & Durability: Reinforces material strength, maintaining quality under changing conditions and heavy use.
  • User-Friendly Mixing: Straightforward dosage and mixing procedures ensure consistent results, whether you’re a seasoned contractor or a first-time user.
MACt Shrinkage Reducing Powdered Admixture is a game-changing solution for achieving crack-free, durable, and visually pleasing concrete or GFRC projects. By controlling the rate of hydration, improving workability, and reinforcing the final product against environmental stress, this admixture significantly reduces shrinkage-related issues. Whether you’re crafting architectural masterpieces, decorative elements, or practical installations, rely on MACt’s proven formula to help you produce professional, long-lasting outcomes.

Additional information

Weight10 kg
Dimensions61 × 38 × 7.5 cm

We have a 30-day return policy, which means you have 30 days after receiving your item to request a return.
To start a return, you can contact us at sales@mact.au
Please note that returns will need to be sent to the following address:
Unit 3C, 919-925 Nudgee Road, Banyo, QLD, 4014, Australia
If your return is accepted, we’ll send you instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted. Please note that if your country of residence is not Australia, shipping your goods may take longer than expected.
You can always contact us for any return questions at sales@mact.au

Expect prompt delivery and easy tracking — every order comes with updates along the way.

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Got any question?

Browse through our frequently asked questions to find answers on everything from mould preparation and casting techniques to finishing and long-term maintenance.

Australia’s warm and, in many regions, coastal climate necessitates adjustments during manufacturing. High temperatures can accelerate hydration, so controlled curing environments—such as covering pieces with plastic to retain moisture—are essential. Additionally, lower water-to-cement ratios and carefully selected admixtures help mitigate rapid evaporation and ensure that GFRC develops its designed strength and durability.

Manufacturers address these challenges by:

  • Using precision mixing equipment to achieve a uniform blend and ensure proper fibre distribution.
  • Fine-tuning spray parameters (such as pressure, nozzle design and technique) to avoid voids, pinholes and surface defects.
  • Regular maintenance of equipment and continuous operator training.
  • Adjusting admixture dosages as required to optimise workability and adhesion.

Future trends include increased automation—such as robotic spraying and digital mould design—as well as a greater focus on sustainable practices (e.g. incorporating recycled materials and eco-friendly admixtures). Advances in fibre treatment technology and computer-aided manufacturing are enabling more complex, custom-designed panels. Ongoing research is continually refining mix designs and curing methods to better suit Australia’s diverse environmental conditions.

GFRC is a composite product that combines high‐quality cement, fine aggregates, polymers and alkali‐resistant glass fibres – all premixed to the correct proportions. Its high strength‐to‐weight ratio, durability and capacity for being cast in thin, custom shapes make it ideal for creating stylish and long-lasting benches and tables for both indoor and outdoor use.

GFRC manufacturers must comply with Australian building codes and standards relating to precast concrete, structural performance and safety. This means that production processes, material testing and installation methods are stringently monitored and documented. Close collaboration with local certifying bodies ensures that GFRC products meet all necessary performance and regulatory requirements.

With our premix product, all the ingredients are already proportioned for optimal strength and workability. This means you can focus on preparing your moulds and executing a neat cast rather than measuring raw materials.

Moulds for benches and tables can be constructed from high-density foam, melamine, or even silicone for more intricate designs. It is essential that the mould is smooth, watertight and well supported. Pre-treat the interior with a quality release agent to ensure that the cured GFRC can be removed cleanly.

Typical additional admixtures levels for a 20kg:

  • Water: 2.78L–3.0L
  • Plasticiser: 10g – 50g
  • Fibres HD: 50g-300g
  • Fibres Bundled: 400g-700g
  • Retarder: 5g-20g
  • Accelerator: 5g–20g
  • Defoamer: 1g-3g
  • Colour: up to 800g

*NOTE: All admixes will alter the way the mix behaves.

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