Fosroc Auracast 230A
A high-performance, chloride-free polycarboxylate ether (PCE) superplasticiser engineered for self-compacting concrete, super-workable flowing mixes and demanding precast production.
What is it?
A new-generation polycarboxylate ether (PCE) based high-range water-reducing superplasticiser admixture from Fosroc, supplied as a ready-to-use liquid and dosed into the concrete mix water.
Where is it used?
Self-compacting concrete (SCC), super-workable flowing concrete, precast and prestressed units, fibre-reinforced concrete, and densely reinforced or difficult-access pours.
Why use it?
It produces flowing, self-levelling concrete at low water-cement ratios without bleed or segregation, lifting early and ultimate strength while cutting vibration, labour and finishing effort.
How is it applied?
Added to the gauging water (never to dry cement) at typically 0.3-1.5 litres per 100 kg of cementitious material, with the exact dosage confirmed by site trial mixes.
About Fosroc Auracast 230A
Fosroc Auracast 230A belongs to the Auracast family of advanced concrete admixtures, the company’s premium range of polycarboxylate ether (PCE) superplasticisers. Where older sulphonated naphthalene (SNF) and melamine plasticisers disperse cement grains mainly by electrostatic charge, Auracast 230A works through steric hindrance: long polymer side chains physically hold cement particles apart, releasing trapped water and unlocking very high workability from a low water content. The result is concrete that flows, fills and self-levels around congested reinforcement yet keeps the dense, low-permeability matrix that durability depends on.
Fosroc positions Auracast 230A specifically for self-compacting concrete (SCC) and super-workable flowing concrete, including self-compacting fibre-reinforced mixes. It is engineered to deliver flow without the bleed and segregation that plague over-plasticised mixes, to disperse fibres evenly, and to perform reliably even with poorly graded aggregates. Crucially for Indian conditions, it is chloride free, making it suitable for reinforced and prestressed concrete where embedded steel must be protected from corrosion.
For contractors, consultants and precast manufacturers, the practical appeal is twofold. First, productivity: SCC placed with Auracast 230A needs little or no vibration, so pours are faster, quieter and less labour-intensive, and surface finishes come off the form cleaner. Second, performance: the low water-cement ratio it enables drives high early strength (useful for faster precast demoulding and formwork cycling) and high ultimate strength and durability. Space Arc Engineering supplies Auracast 230A as an authorised Fosroc distributor and applicator across Delhi NCR and Pan-India, alongside technical support on dosage optimisation and trial mixes.
The technical insight
The defining technical trait of Auracast 230A is extremely low admixture viscosity combined with high water reduction. In PCE chemistry the polymer architecture (the balance of main-chain length to side-chain length and density) governs both how much water it saves and how the fresh concrete behaves over time. Fosroc has tuned Auracast 230A for SCC rheology: high flow and passing ability with strong resistance to segregation, so the paste carries the aggregate rather than letting it settle. Because it is a high-range water reducer, modest dosage changes produce large workability changes, which is why a site trial mix with the actual cement, supplementary cementitious materials (fly ash/GGBS) and aggregates is essential before bulk use. Like all PCE superplasticisers it is sensitive to mix-water content and cement chemistry, and overdosing can cause retardation or, in SCC, an increased risk of segregation. It is best added to the wet mix after the bulk of the gauging water, not to the dry materials, to develop its full dispersing effect.
Where it is used
- Self-compacting concrete (SCC) for columns, walls, rafts and architectural elements
- Precast and prestressed concrete units requiring fast strength gain and clean finishes
- Super-workable flowing concrete for densely reinforced or congested sections
- Self-compacting fibre-reinforced concrete needing even fibre dispersion
- High-strength, low water-cement ratio structural concrete
- Pumped concrete over long distances or to height where flow retention matters
- Architectural and exposed-finish concrete where surface quality is critical
Key advantages
- Chloride free – safe for reinforced and prestressed concrete with embedded steel
- Produces high workability and self-compacting flow without bleed or segregation
- High water reduction enables low w/c ratio, raising early and ultimate strength
- Greatly reduces or eliminates the need for vibration, cutting labour and noise
- Improved, cleaner surface finishes straight off the form
- Disperses steel and synthetic fibres evenly through the mix
- Performs well even with poorly graded aggregates and varying cement sources
- Faster precast demoulding and formwork cycling from rapid early strength
Limitations & considerations
- Highly dosage-sensitive – small overdoses can cause retardation or segregation in SCC
- Mandatory trial mixes needed with the actual local cement, SCMs and aggregates
- Not designed to be mixed with non-PCE plasticisers (SNF/melamine) without compatibility checks
- Performance varies with cement chemistry and mix-water content; needs control on site
- A superplasticiser only – does not provide air entrainment, waterproofing or set acceleration on its own
- Liquid admixture requiring protection from freezing and correct dispensing equipment
- SCC mix design demands stricter QC on aggregate grading and consistency than conventional concrete
Selection & best practice
Always establish dosage by trial mix using the project’s actual cement, fly ash/GGBS and aggregates rather than copying a generic figure, and start near the lower end of the dosage band. Add Auracast 230A to the gauging water (or to the wet mix after most of the water), never directly onto dry cement, and avoid dispensing it together with incompatible non-PCE admixtures. For SCC, verify fresh properties with slump-flow, T500 and (where specified) L-box or V-funnel tests on each trial, and re-check whenever a material source changes. Store the product in shaded conditions, protect it from frost, keep containers sealed, and use a calibrated dispenser for batch-to-batch consistency. Confirm the current Technical Data Sheet, Safety Data Sheet and Declaration of Performance for the India market through Space Arc Engineering before specification.
Specifications
| Product type | Polycarboxylate ether (PCE) high-range water-reducing superplasticiser |
| Action mechanism | Steric hindrance dispersion of cement particles |
| Primary use | Self-compacting & super-workable flowing concrete |
| Form | Ready-to-use liquid admixture |
| Chloride content | Chloride free (nil) – suitable for reinforced/prestressed concrete |
| Typical dosage | ~0.3 to 1.5 litres per 100 kg of cementitious material (confirm by trial mix) |
| Specific gravity | Approx. 1.05-1.10 at 20 deg C (typical for Auracast PCE range; verify on current TDS) |
| Standards (typical for range) | IS 9103 superplasticiser; ASTM C494 Type F/G (dosage dependent); EN 934-2 (DOP Feb 2019) |
| Addition point | To the gauging water / wet mix, not to dry cement |
| Declaration of Performance | DOP Auracast 230A, Feb 2019 (per official Fosroc listing) |
Industry use cases
Precast & prestressed plants
High early strength from a low w/c ratio lets manufacturers demould sooner and cycle formwork faster, while self-compacting flow gives sharp, blemish-free architectural finishes.
High-rise & infrastructure RMC
Enables pumpable, self-levelling SCC for heavily reinforced columns, cores and transfer slabs where vibration access is poor, reducing honeycombing risk.
Fibre-reinforced concrete
Even dispersion of steel or synthetic fibres in self-compacting mixes for industrial floors, tunnel linings and repair sections.
Architectural / exposed concrete
Clean off-form surfaces and consistent colour for fair-faced walls, facades and feature elements without surface vibration marks.
Congested & difficult-access pours
Flowing concrete that fills complex formwork and dense rebar cages on bridges, basements and water-retaining structures without manual compaction.
Frequently asked questions
Is Fosroc Auracast 230A chloride free and safe for reinforced concrete?
What is the correct dosage for Auracast 230A?
What type of admixture is Auracast 230A and what standards does it meet?
How is Auracast 230A different from a normal plasticiser like Conplast?
Can Auracast 230A be used for self-compacting concrete (SCC)?
Does Space Arc Engineering supply Auracast 230A across India?
How we position Fosroc Auracast 230A
Within the Fosroc admixture portfolio, Auracast 230A sits at the premium PCE end alongside related grades such as Auracast 200, 220A and 270M, and above the Auramix range (e.g. Auramix 300/400) of polycarboxylic-ether superplasticisers used for general high-performance and pumpable concrete. For projects needing retardation or extended workability retention in hot weather, it is often specified with a compatible Fosroc retarder, while general water-reduction work may use a Conplast-series plasticiser. Among competitors, credible alternatives in the Indian market include Sika’s ViscoCrete PCE superplasticiser range (for SCC and high-workability concrete), MBS (Master Builders Solutions, formerly BASF) MasterGlenium PCE admixtures, and Dr. Fixit / STP admixtures for more general plasticising and water-reducing needs. Auracast 230A’s clearest differentiators are its very low viscosity, strong segregation resistance in SCC, chloride-free formulation for embedded steel, and Fosroc’s established technical-support network. Space Arc Engineering helps specifiers select between these options and validate dosage through site trials before committing to a mix design.
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