Fosroc Conplast AE330
A chloride-free, dual-function air-entraining and retarding admixture that builds freeze-thaw and de-icing-salt durability into concrete while extending working time for long hauls and large pours.
What is it?
Conplast AE330 is a chloride-free liquid admixture that does two jobs at once: it entrains a stable system of microscopic air bubbles in concrete and simultaneously retards the set. Supplied as a clear to light-yellow solution that disperses instantly in the mixing water.
Where is it used?
Frost- and de-icing-salt-exposed concrete such as roads, bridge decks, airport runways and taxiways; mixes built on poorly graded aggregates that bleed or segregate; and ready-mixed retarded mortar systems. In India it is most relevant to high-altitude, hill-state and cold-region infrastructure.
Why use it?
It raises freeze-thaw and surface-scaling resistance, cuts bleeding and segregation, improves workability and surface finish, and the built-in retardation keeps concrete workable through long transit times and large continuous pours.
How is it applied?
Dispensed by a calibrated dispenser and added to the concrete along with the mixing water. A typical starting trial dosage is 0.10 litres per 100 kg of cement, then optimised on site by trial mix to hit the target air content.
About Fosroc Conplast AE330
Conplast AE330 belongs to Fosroc’s well-established Conplast range of concrete admixtures, but it occupies an unusual niche: it is one of the few products in the family engineered to deliver air entrainment and set retardation from a single liquid. Most air entrainers — Conplast AE300, AE316 or AEA — do one job; AE330 combines durability protection with extended working time, which makes it a practical choice where concrete must travel far or be placed over many hours and still resist frost damage once hardened.
Chemically it is a chloride-free, water-based solution that acts at the interface between the mixing water and the cement and aggregate particles, generating a network of fine, evenly distributed air bubbles throughout the concrete. Those bubbles are not voids in the negative sense — they are designed relief chambers. When water inside hardened concrete freezes and expands, the bubbles give it room to move, relieving the internal pressure that would otherwise crack the matrix. The same bubble system also reduces the channels through which de-icing salts and water migrate, cutting down the surface scaling that plagues exposed pavements in cold climates.
For Space Arc Engineering customers, the honest framing is that AE330 is a specialist, not an everyday admixture. The bulk of Indian concrete — in Delhi NCR plains, the western and southern states — never freezes, and for those projects a water reducer or superplasticiser delivers more value. AE330 earns its place on projects in Jammu & Kashmir, Ladakh, Himachal Pradesh, Uttarakhand, Sikkim and the higher reaches of the North-East, on hill roads and bridges, on high-altitude defence and border infrastructure, and anywhere a structure will face repeated freeze-thaw cycling. Its retarding side, however, has wider appeal: any long-haul ready-mix delivery or large raft pour in hot Indian conditions benefits from extended workability, and AE330 offers both that and air entrainment in one drum. Because it is produced and documented through Fosroc’s Egypt/Middle East operation (datasheet reference EG/0063/22/A), Space Arc supplies it as a sourced specialist item rather than a routine stock line.
The technical insight
The engineering value of AE330 is the air-void system, not simply the headline air percentage. Durable freeze-thaw performance depends on bubble spacing factor and specific surface — closely spaced, fine bubbles protect the paste; large, sparse voids merely lose strength. The datasheet’s guidance of roughly 5 plus or minus 1.5% air at a 0.10 litres/100 kg starting dose, in a 300 to 350 kg per cubic metre cementitious mix, is a calibration point, not a fixed recipe. Air yield shifts with sand grading and silt content, cement fineness and content, temperature (a rise from 10°C to 32°C can roughly halve the entrained air), mixer type and transit time. This temperature sensitivity matters acutely in India, where a mix batched in a cool Himalayan morning behaves very differently from the same dose placed in afternoon sun, which is exactly why Fosroc insists every dosage be fixed by trial mix using the actual job materials, and why air content must be verified at the point of placing using the pressure method of BS 1881 or ASTM C231. Overdosing is not benign: double the intended amount produces heavy retardation plus excess air, and the combination drops strength sharply.
Where it is used
- Air-entrained pavement-quality concrete (PQC) for roads exposed to frost and de-icing salt
- Bridge decks and structural concrete in cold and high-altitude regions
- Airport runways, taxiways and aprons requiring scaling resistance
- Large or long-haul concrete pours where extended working time is needed alongside air entrainment
- Concrete mixes built on poorly graded or silty aggregates that bleed or segregate
- Ready-mixed retarded mortar as part of a combined admixture system
- High-altitude defence, border-road and hydropower concrete in the Himalayan belt
Key advantages
- Dual action: air entrainment and set retardation from a single chloride-free admixture
- Significantly improves resistance to freeze-thaw damage and de-icing-salt surface scaling
- Stable, evenly distributed air-bubble system that tolerates a wide range of aggregate qualities
- Reduces bleeding and segregation, giving a more cohesive, pumpable mix
- Built-in retardation extends working time for long transit distances and large continuous pours
- Produces a dense, uniform, close-textured surface free from gravel nests and sand runs
- Chloride-free (nil to BS 5075), so safe for use in reinforced and prestressed concrete
- Compatible with other Fosroc admixtures when each is dosed separately
- Complies with ASTM C260 as an air-entraining admixture
Limitations & considerations
- A cold-climate specialist — offers little benefit for the majority of Indian concrete that never faces freeze-thaw
- Air yield is highly sensitive to temperature, sand grading, cement and mixing conditions, so on-site trial mixes are mandatory
- Entrained air reduces compressive strength; mix design must compensate (roughly 5% strength loss per 1% air)
- Overdosing causes severe retardation plus excess air and a marked strength drop
- Low-grade PFA can sharply raise the dosage needed; Fosroc recommends synthetic-surfactant Conplast AE210 in such cases
- Not a water reducer — pair with a plasticiser/superplasticiser where workability and strength both matter
- Sourced through Fosroc’s Egypt/Middle East operation rather than the mainstream India catalogue, so lead times can be longer
- Shelf life of only 12 months and must be stored between 5°C and 35°C, away from direct sunlight
Selection & best practice
Always establish the dosage by trial mix using the project’s own cement, aggregates and expected placing temperature — never carry a dose over from another job. Add AE330 separately into the mixing water through a calibrated dispenser, never pre-blended with other admixtures. Verify air content at the point of placement using the pressure method (BS 1881 / ASTM C231) and re-check whenever sand source, cement, or ambient temperature shifts. Because air lowers strength, design the mix with that trade-off built in. Maintain good curing — water spray, wet hessian, or a Concure curing membrane — and store drums between 5°C and 35°C, out of direct sun, using stock within the 12-month shelf life.
Specifications
| Product Type | Chloride-free air-entraining and retarding admixture |
| Appearance | Clear to light-yellow liquid |
| Specific Gravity | Typically 1.145 at 25 ± 2°C |
| Chloride Content | Nil to BS 5075 |
| Alkali Content | Typically less than 14.0 g Na2O equivalent per litre |
| Freezing Point | Approximately 0°C |
| Standards Compliance | ASTM C260 (Air Entrainer) |
| Typical Starting Dosage | 0.10 litres per 100 kg of cement |
| Resulting Air Content (guide) | 5 ± 1.5% in 300–350 kg/m³ cementitious, medium-workability concrete |
| Air Content Test Method | Pressure method per BS 1881 / ASTM C231 |
| Packaging | Drums and bulk supply (storage tanks for large users) |
| Shelf Life | 12 months at 5°C to 35°C, away from direct sunlight |
| Flammability | Water-based, non-flammable |
Industry use cases
Hill & High-Altitude Roads
Pavement-quality concrete for roads in J&K, Ladakh, Himachal, Uttarakhand and the North-East, where freeze-thaw cycling and de-icing salts attack unprotected concrete surfaces.
Bridges & Flyovers
Bridge decks and exposed structural elements in cold regions, where entrained air resists scaling and the chloride-free formulation protects embedded reinforcement.
Airports & Defence Infrastructure
Runways, taxiways, aprons and high-altitude border and defence concrete that must endure repeated freezing and thawing without surface failure.
Ready-Mixed Concrete (RMC)
Long-haul deliveries and large continuous pours where the built-in retardation keeps concrete workable while air entrainment improves cohesion and pumpability.
Retarded Mortar Systems
Used as part of a combined admixture system to produce ready-mixed retarded mortar with extended working life.
Frequently asked questions
Is Fosroc Conplast AE330 chloride-free and safe for reinforced concrete?
What dosage of Conplast AE330 should I use?
How is AE330 different from Conplast AE300 or AE316?
Does AE330 reduce concrete strength?
Is Conplast AE330 useful for typical concrete in Delhi NCR or southern India?
What standards does Conplast AE330 comply with?
How we position Fosroc Conplast AE330
Within the Fosroc range, Conplast AE330 sits between the pure air entrainers and the retarders: think of it as AE300/AE316 air-entrainment combined with the working-time extension of a retarder like Conplast RP264. For freeze-thaw durability alone, AE300 or AE316 may be simpler choices; where low-grade PFA is in the mix, Fosroc itself recommends the synthetic-surfactant Conplast AE210 instead. Pair AE330 with a Fosroc water reducer or superplasticiser (Conplast range) when strength and workability both matter, since AE330 is not a water reducer. Against the wider Indian market, the closest competitors are Sika’s air-entraining admixtures (Sika AER series), BASF/Master Builders Solutions MasterAir, and the air-entraining/retarding admixtures from STP and Dr. Fixit (Pidilite); MBS MasterSet covers the retarding side. Space Arc Engineering’s honest position is that AE330 is a niche specialist worth specifying for cold-region and long-haul infrastructure, while most everyday Indian concrete is better served by a plain water reducer or superplasticiser.
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