Fosroc Auramix 450
Polycarboxylic ether (PCE) based high-range water-reducing admixture for self-compacting, pumped and high-performance concrete, supplied across Delhi NCR and Pan-India by Space Arc Engineering, your authorised Fosroc distributor and applicator.
What is it?
Fosroc Auramix 450 is a polycarboxylic ether (PCE) based high-range water-reducing admixture, a high-performance superplasticiser supplied as a light yellow, chloride-free liquid.
Where is it used?
Used in self-compacting, pumped, long-retention and high-performance concrete on Indian infrastructure, commercial and ready-mix projects across Delhi NCR and Pan-India.
Why use it?
Delivers strong water reduction (approx. 15-30% depending on mix and cement) for higher strength, improved durability and excellent flow, with 60-90 minutes of slump retention for pumping and placing.
How is it applied?
Added to the mix water at 0.5-2.0 kg per 100 kg of cementitious material; never added to dry aggregate. Trial mixes confirm optimum dosage for the target mix design.
About Fosroc Auramix 450
Fosroc Auramix 450 is a high-range water-reducing admixture based on polycarboxylic ether (PCE) technology. Unlike older sulphonated naphthalene (SNF) superplasticisers, the PCE polymer disperses cement particles through steric (side-chain) action, releasing trapped water and allowing substantial reductions in the water-cement ratio without sacrificing workability. Supplied as a light yellow liquid, it is chloride-free, water-based and non-flammable, making it suitable for reinforced and prestressed concrete where chloride ingress must be avoided.
For Indian contractors and ready-mix producers, Auramix 450 is positioned for self-compacting concrete (SCC), pumped concrete, concrete requiring long workability retention, and general high-performance concrete. By cutting mix water by approximately 15-30% (depending on mix design and cement type) while holding workability, it raises compressive strength, lowers permeability and improves long-term durability. Its 60-90 minute slump retention window suits the transit and pumping times common on Delhi NCR and Pan-India sites.
As an authorised Fosroc distributor and applicator, Space Arc Engineering supplies genuine Auramix 450 with technical support, batching guidance and full datasheet documentation. Where a project specifies an alternative, comparable PCE superplasticisers include BASF MasterGlenium / Master Builders Solutions, Sika ViscoCrete and Chryso ranges; we can advise on equivalence and compatibility with your cement and supplementary cementitious materials.
The technical insight
Auramix 450 complies with IS 9103-1999 (reaffirmed 2013) and ASTM C 494 Type F and G (depending on dosage), giving it dual classification as both a high-range water-reducing admixture (Type F) and a water-reducing, retarding admixture (Type G) at higher dosages. The PCE base is chloride-free with a pH of at least 6.0 and a specific gravity of 1.09-1.11. Dosage is expressed on a mass basis at 0.5-2.0 kg per 100 kg of cementitious material (one trade listing also cites 0.5-1.0% by weight of cement); the optimum is established by trial mix because PCE response varies with cement chemistry, fly ash/GGBS content and aggregate fines. Overdosing can cause excessive retardation or bleeding, so site batching should follow the trial-confirmed rate.
Where it is used
- Self-compacting concrete (SCC) requiring high flow without segregation
- Pumped concrete for high-rise and long-distance placement
- Concrete requiring extended workability retention during transit
- General high-performance concrete for durability-critical structures
- Ready-mix concrete production needing consistent water reduction
- Reinforced and prestressed elements where chloride-free admixtures are mandatory
Key advantages
- Polycarboxylic ether (PCE) chemistry delivers strong water reduction of approx. 15-30% depending on mix and cement
- Improves compressive strength and durability by lowering the water-cement ratio
- Maintains workability with 60-90 minutes of slump retention for pumping and placing
- Chloride-free and safe for reinforced and prestressed concrete
- Compliant with IS 9103-1999 and ASTM C 494 Type F and G
- Supports self-compacting and high-flow mixes without segregation when correctly dosed
Limitations & considerations
- Optimum dosage must be confirmed by trial mix; PCE response varies with cement and SCM type
- Overdosing can cause excessive retardation, bleeding or segregation
- Performance is sensitive to mix design, aggregate fines and cement chemistry
- Should be added to the mix water, not to dry materials, for correct dispersion
- As a water-based liquid, requires protection from freezing during storage
Selection & best practice
Always add Auramix 450 to the gauging (mix) water rather than to dry cement or aggregate, and establish the optimum dosage within the 0.5-2.0 kg per 100 kg cementitious material range through trial mixes using your actual cement and supplementary materials. Avoid overdosing, which can lead to retardation or bleeding. Store in a cool, shaded place, protect from freezing, and use within the 12-month shelf life. Contact Space Arc Engineering for mix-design support and batching advice on your specific Delhi NCR or Pan-India project.
Specifications
| Chemical base | Polycarboxylic ether (PCE) technology — high range water reducing admixture |
| Appearance / colour | Light yellow liquid |
| Specific gravity | 1.09 – 1.11 |
| pH value | ≥ 6.0 |
| Chloride content | Nil / chloride-free |
| Dosage | 0.5 – 2.0 kg per 100 kg of cementitious material |
| Water reduction | Approx. 15 – 30% depending on mix design and cement type |
| Workability / slump retention | 60 – 90 minutes |
| Standards complied | IS 9103-1999 (2013); ASTM C 494 Type F and G (depending on dosage) |
| Shelf life | Minimum 12 months; non-flammable, water-based |
Industry use cases
Ready-Mix Concrete
Used by RMC plants across Delhi NCR for consistent water reduction and 60-90 minute workability retention during transit to site.
High-Rise Construction
Enables reliable pumped concrete placement at height while maintaining flow and reducing the water-cement ratio for stronger, more durable structures.
Infrastructure
Supports self-compacting and high-performance concrete in heavily reinforced sections where chloride-free admixtures are required.
Commercial Buildings
Delivers SCC for congested reinforcement and architectural pours, achieving full compaction without vibration.
Frequently asked questions
What type of admixture is Fosroc Auramix 450?
What is the correct dosage for Auramix 450?
How much water reduction can I expect?
Which standards does Auramix 450 comply with?
Is Auramix 450 safe for reinforced concrete?
How long does Auramix 450 keep concrete workable?
What is the shelf life and how should it be stored?
Does Space Arc Engineering supply Auramix 450 across India?
How we position Fosroc Auramix 450
Fosroc Auramix 450 is positioned as a versatile PCE-based superplasticiser for self-compacting, pumped, long-retention and high-performance concrete, typically used in M40-M60 class mixes. Space Arc Engineering leads with genuine Fosroc supply backed by authorised-distributor technical support, and can advise on comparable PCE alternatives such as BASF MasterGlenium, Sika ViscoCrete and Chryso where a project specifies them.
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