MC-Bauchemie Centrament Air 200
A synthetic, vinsol-resin-free air-entraining admixture that builds a stable network of microscopic air voids, giving concrete lasting resistance to freeze-thaw cycling and de-icing salt scaling.
What is it?
A liquid synthetic air-entraining admixture (AEA) from MC-Bauchemie that deliberately introduces a controlled system of tiny, evenly spaced air bubbles into fresh concrete. It complies with EN 934-2 Table 5 and IS 9103, and unlike traditional natural products it uses a vinsol-resin-free chemistry for more consistent behaviour.
Where is it used?
Concrete exposed to frost and de-icing salts: hill and expressway pavements, bridge decks, tunnel linings, retaining walls, culverts, and water-retaining structures across colder and high-altitude regions of India.
Why use it?
Freeze-thaw cycling and de-icing salt are two of the most aggressive durability threats to concrete. A properly entrained air-void system relieves the internal hydraulic pressure that cracks and scales concrete, dramatically extending service life in cold climates.
How is it applied?
Added to the mixing water or directly to the mixer at a dosage of roughly 0.02 to 0.10 percent by mass of cement, calibrated by trial mixes. Air content is then verified on site to the target band before placing.
About MC-Bauchemie Centrament Air 200
Centrament Air 200 is MC-Bauchemie’s synthetic air-entraining admixture, formulated specifically for concrete that has to survive repeated freezing and thawing and exposure to de-icing salts. In simple terms, it does one job extremely well: it creates and holds a population of microscopic air bubbles inside the concrete. Those bubbles are not a defect. They are engineered voids, evenly distributed and closely spaced, that give freezing water somewhere to expand into instead of forcing the surrounding paste apart. The admixture arrives as an aqueous liquid and disperses instantly in the mix water, and because it is free of corrosion-promoting components it can be used with reinforced sections without concern for the steel.\n\nWhat sets this product apart from older air-entrainers is its vinsol-resin-free, synthetic base. Natural resin-based agents can behave unpredictably as cement chemistry, fines content, and temperature change from batch to batch. The synthetic chemistry in Centrament Air 200 produces a more uniform and reproducible air-void system, which is exactly what a durability specification demands. For an Indian project team pouring pavement or bridge deck in the Himalayan belt or the Northeast, that consistency is the difference between a mix that passes air-content checks first time and one that has to be re-trialled load after load. Space Arc Engineering supplies it as an authorised MC-Bauchemie distributor across Delhi NCR and Pan-India, with application support at the mix-design stage.
The technical insight
The damage that frost does to concrete is really a plumbing problem. As pore water freezes it expands by about nine percent, and if it has nowhere to go it generates hydraulic pressure inside the capillary pore structure that tears the hardened paste apart. Over dozens of freeze-thaw cycles this shows up as surface scaling, crazing and eventual disintegration, and de-icing salt makes it worse by driving osmotic and thermal shock at the surface. Air entrainment solves this at the root. Centrament Air 200 stabilises millions of discrete air bubbles in the paste; when water in the surrounding capillaries freezes, it is pushed the very short distance into the nearest empty air void rather than building destructive pressure. The critical parameter is not just how much air you have but how closely spaced the voids are, expressed as the spacing factor (L-bar). A well-entrained mix keeps this below roughly 200 microns so that no pocket of freezing water is ever far from relief. Centrament Air 200 is designed to deliver that fine, uniform void structure and to hold it through mixing and pumping, so the protection you design in the lab is the protection that ends up in the structure.
Where it is used
- Concrete road pavements and expressways in hill and high-altitude regions subject to seasonal freezing
- Bridge decks and approach slabs exposed to de-icing salt run-off
- Tunnel linings, both shotcrete and cast-in-place, in cold mountain corridors
- Retaining walls, culverts and drainage structures in freeze-thaw zones
- Cold-weather concreting in foothill and northern belt projects
- Water-retaining structures such as tanks and reservoirs where durability governs
- Precast elements and ready-mixed concrete requiring a specified air content
- Runway, apron and hardstanding concrete in cold-climate airfields
Key advantages
- Synthetic, vinsol-resin-free chemistry gives a more consistent and reproducible air-void system than natural resin agents
- Delivers a fine, closely spaced void structure with a spacing factor typically below 200 microns for genuine freeze-thaw protection
- Free of corrosion-promoting components, so it is safe to use in reinforced concrete
- Holds entrained air through pumping and placing, so lab performance carries through to the structure
- Improves workability and cohesion, making the mix easier to compact and finish
- Reduces bleeding and segregation for a denser, more uniform surface
- Compliant with EN 934-2 Table 5 and IS 9103, so it slots cleanly into specifications
- Effective at low dosage, keeping the impact on mix economics modest
Limitations & considerations
- Every additional one percent of entrained air costs roughly five percent of 28-day compressive strength, so air must be dosed to the durability requirement, not overshot
- Dosage is sensitive to cement type, fines, sand grading, temperature and mixing time, and must be fixed by trial mixes rather than a single fixed rate
- Air content has to be checked on site with a pressure meter (EN 12350-7 or ASTM C231) load by load, since it is not self-verifying
- Direct contact with SBR latex or polymer emulsions in the mixer can destabilise the air system and should be avoided
- Over-mixing, over-vibration or long haul times can drive off entrained air and reduce protection
- It addresses frost and salt durability only; it is not a water-reducer or a substitute for a proper mix design
Selection & best practice
Always establish the dosage by trial mix for the specific cement, aggregates and target air content on your project, rather than assuming a fixed rate. Add Centrament Air 200 to the mixing water or the mixer, never to the dry cement, and keep it away from any SBR latex or polymer emulsion being batched separately. Fix a target air band up front, typically 4 to 6 percent for 20 mm aggregate and 4.5 to 7.5 percent for 12.5 mm aggregate, and verify it on site with a pressure air meter before every significant pour. Keep mixing time, transport and vibration consistent, because changes in any of these will move the air content. Because entrained air reduces strength, coordinate the durability air target with the structural mix design so both are satisfied. Store the product in sealed containers, protected from frost, and re-check air content whenever a material or ambient condition changes.
Specifications
| Product type | Synthetic air-entraining admixture (AEA), aqueous liquid |
| Base chemistry | Vinsol-resin-free synthetic surfactant; free of corrosion-promoting components |
| Standards | EN 934-2 Table 5; IS 9103 |
| Typical dosage | 0.02 to 0.10 % by mass of cement (confirm by trial mix) |
| Target air content (20 mm aggregate) | 4 to 6 % by volume |
| Target air content (12.5 mm aggregate) | 4.5 to 7.5 % by volume |
| Spacing factor (L-bar) | Typically < 200 microns (ASTM C457) |
| Strength effect | Approx. 5 % reduction in 28-day strength per 1 % additional air |
| Air measurement method | EN 12350-7 or ASTM C231 (pressure method) |
Industry use cases
Highways & Expressways
Concrete pavements, bridge decks and approach slabs on hill and high-altitude routes that face seasonal freezing and de-icing salt need a reliable, closely spaced air-void system to resist surface scaling over their design life.
Tunnels & Underground
Shotcrete and cast-in-place linings in cold mountain corridors use Centrament Air 200 to build freeze-thaw durability into the lining while keeping the mix cohesive and pumpable.
Water & Environmental
Tanks, reservoirs and retaining structures in cold regions gain long-term durability from a stable entrained-air system that resists frost damage without introducing corrosion risk to reinforcement.
Precast & Ready-Mix
Producers who must hit a specified air content batch after batch value the synthetic chemistry’s consistency, which reduces re-trialling and rejected loads at the plant.
Airfields & Hardstandings
Runway, apron and hardstanding concrete in cold-climate airfields relies on entrained air to survive repeated freeze-thaw cycling and de-icing operations without spalling.
Frequently asked questions
What exactly does Centrament Air 200 do to concrete?
How much should I dose?
Will it reduce my concrete’s strength?
How is it different from a vinsol-resin air-entrainer like Conplast AEA?
Is it safe for reinforced concrete?
How do I confirm I have the right amount of air on site?
How we position MC-Bauchemie Centrament Air 200
Centrament Air 200 sits within MC-Bauchemie’s Centrament Air family; where a project needs different air-generation behaviour or dosing characteristics, the related Centrament Air 201, 203 and 220 grades are worth reviewing with our technical team. Because air-entrainment is usually one part of a durability mix design, it pairs naturally with an MC-Bauchemie water-reducer or superplasticiser from the Muraplast or Centrament range to hold workability and strength while the air does its job. For teams that prefer a Fosroc-based admixture line, Space Arc also supplies the Conplast admixture range as an authorised Fosroc distributor, so a full mix design can be built from a single brand family if the specification calls for it.
Fosroc Conplast AEA — A specifier may choose Conplast AEA when the project already names a Fosroc admixture line or prefers a proven neutralised vinsol-resin air-entrainer over a synthetic one.
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