Boral Blue Circle HS Concrete Mix

Boral Blue Circle HS Concrete 50MPa* Mix is a high-strength concrete blend containing quality aggregates, sands, and cement, designed for applications requiring enhanced compressive strength and durability. Suitable for both professional and DIY use, this mix offers fast early age strength development, excellent workability, and superior finishing properties compared to standard concrete mixes. Simply add water and mix for reliable results in structural and general concreting tasks.

Key features include high cement content for increased strength, rapid strength gain, and compatibility with various conditions—though compressive strength on site varies with water amount, compaction, temperature, and curing. It is alkaline and may require priming/sealing for use with aluminium or galvanised products; consult manufacturers. Available in convenient 20kg plastic-lined multi-walled paper sacks, it suits projects of any scale from residential slabs to commercial footings.

Technical specifications highlight its exceptional performance:

• Compressive Strength: Typically exceeds 50MPa* at 28 days when tested per AS1012 parts 8.1 & 9; varies with mixing, compaction, temperature, and curing.
• Setting Time: Protect from moisture loss as soon as surface is firm; cure for a minimum of 7 days.
• Yield: One 20kg bag yields approximately 0.009 cubic metres; 108 bags per cubic metre.

For optimal results, follow recommended mixing instructions:

• Use a wheelbarrow with hoe/shovel or mechanical mixer.
• Add 75% of water (total ~2 litres per 20kg bag) to vessel, then slowly add bag contents.
• Gradually add remaining water for workable mix; avoid over-watering to maintain strength.
• Prepare formwork with 25mm timber, oil insides, and ensure drainage.
• Place on compacted, lightly soaked base; screed, float, and finish as needed (wooden float for non-slip, steel trowel for smooth).
• In hot weather (>32°C), delay placement to prevent rapid drying.

Store unopened bags in a cool, dry place off the ground; discard opened or deteriorated bags due to moisture absorption. Safety precautions are essential: Avoid dust generation and inhalation with P2 masks in ventilated areas; use goggles, gloves, and barrier creams; wash off skin contact immediately to prevent alkali burns. Contains cement chemicals and trace hexavalent chromium; refer to the Safety Data Sheet for full details. Clean tools with water promptly after use.

Choose Boral Blue Circle HS Concrete 50MPa* Mix for high-strength, long-lasting concrete solutions in your next project, backed by Australia’s trusted leader in construction materials.