Product Overview

Auramix 400 is a high-performance polycarboxylate ether (PCE) superplasticiser positioned at the upper end of the Fosroc Auramix range, designed for production of high-strength concrete grades M50 to M70 in structural columns, bridge piers and pylons, prestressed elements, long-span girders, and high-specification durable concrete for infrastructure in aggressive environments. Auramix 400 is formulated with a high molecular weight PCE polymer delivering greater water reduction than the standard Auramix 200 or 300 grades — typically 25 to 30% water reduction versus the control mix at the same workability — enabling water-cement ratios in the range 0.28 to 0.38, which are the water-cement ratios associated with high-strength and very durable concrete. At these very low water-cement ratios, the concrete matrix becomes very dense and discontinuous in its pore structure, giving greatly reduced permeability to water, carbon dioxide, and chlorides and dramatically extending the service life of the structure in aggressive environments. Auramix 400 also provides good workability retention, maintaining adequate slump for 45 to 60 minutes at ambient Indian temperatures — important for ready mix high-strength concrete where the extended transit time from the plant to the high-rise construction site reduces the available placing time. Auramix 400 is compatible with all Portland cements, PPC, PSC, silica fume, fly ash, and GGBS. It is particularly effective in combination with silica fume for ultra-high-strength concrete (M70 and above) where the combined effect of very low water-cement ratio and pozzolanic densification produces exceptional strength and durability. Space Arc Engineering distributes Auramix 400 for high-rise, bridge, and premium infrastructure concrete projects across Delhi NCR and Northern India.

Applications

• High-strength concrete grades M50 to M70 for building columns and bridge piers
• Ultra-low water-cement ratio durable concrete for aggressive environment exposure
• Prestressed concrete beam and slab production at high strength
• Marine and coastal concrete with very low permeability requirement
• High-rise core wall and transfer slab concrete with high workability
• Pump concrete for high-rise construction with slump retention

Key Advantages

• Very high water reduction (25–30%) for M50 to M70 concrete grades
• Dense low-permeability concrete for very long service life in aggressive environments
• Good workability retention for 45–60 minutes at ambient temperatures
• Compatible with silica fume for ultra-high-strength concrete above M70
• Non-chloride — suitable for all reinforced and prestressed concrete
• Part of the Fosroc Auramix premium PCE superplasticiser range