Boral Blue Circle Special Purpose Cement

Boral Blue Circle Special Purpose Cement is a high-performance blended cement formulated for specialized applications requiring lower heat of hydration and enhanced resistance to sulfates, chlorides, and saltwater. Complying with Australian Standard AS 3972 as Type GB, LH, and SR cement, it delivers reliable results in marine environments, mass concrete where reduced heat liberation is important, and aggressive sulfate-rich settings. This product is suitable for concrete expected to contact sulfates or aggressive salts, with optimal performance achieved through high cement content, low water-to-cement ratios, proper compaction, and curing—analytical surveys are recommended for site-specific conditions.

Key features include slower early-age strength development with greater long-term potential, compatibility with AS 1478-compliant admixtures, and not recommended for blending with other cements to preserve its unique properties. It can also be used in mortars following AS 3700 guidelines with clean, well-graded sand. Available in convenient 20kg multi-walled paper sacks, it suits professional projects from infrastructure to coastal builds.

Technical specifications highlight its exceptional performance:

• Compressive Strength: Achieves 23-35 MPa at 7 days (minimum 20 MPa), 45-60 MPa at 28 days (minimum 35 MPa).
• Setting Time: Initial set in 2-4 hours (minimum 45 minutes), final set in 3-5 hours (maximum 10 hours).
• Soundness: 0-1 mm (maximum 5 mm allowed).
• Sulfate Resistance: 150-400 microstrain (maximum 750 microstrain).
• Peak Temperature Rise: 19-23°C (maximum 23°C).

For optimal results, follow recommended mix designs emphasizing dense, low-permeability concrete:

• Refer to AS 1379 for material quality and mixing, AS 3600 for structures.
• Use minimum water to avoid strength reduction; seek professional advice for admixtures, temperature, compaction, and curing.
• For mortars: Follow AS 3700 with clean sand; typical designs not specified but prioritize low water content.

Store unopened bags in a cool, dry environment off the ground to prevent moisture absorption—discard opened or deteriorated bags. Safety precautions are essential: Avoid dust inhalation with P2 masks in ventilated areas, use gloves, goggles, and barrier creams; wash off skin contact immediately to prevent irritation or burns. Contains trace Respirable Crystalline Silica and hexavalent chromium; refer to the Safety Data Sheet for full details.

Choose Boral Blue Circle Special Purpose Cement for durable, specialized outcomes in challenging projects, backed by Australia’s trusted leader in construction materials.