MC-Bauchemie Centrament Flow 250
MC-Bauchemie’s mid-range polycarboxylate ether superplasticiser for pumpable, high-strength M25-M40 concrete with dependable slump retention.
What is it?
A liquid polycarboxylate ether (PCE) superplasticiser from MC-Bauchemie’s Centrament Flow family, positioned as a mid-range water reducer for everyday structural and precast concrete.
Where is it used?
Ready-mix and site batching for M25 to M40 grades, precast yards, foundations, rafts, columns, walls and elevated slabs across Delhi NCR and Pan-India projects.
Why use it?
It cuts mixing water by 20-28% at standard dosage, lifting strength and durability while holding workability long enough to pump and place without a hurried finish.
How is it applied?
Dosed into the mix water or added to the batch at 0.4-0.8% by mass of cement, then mixed thoroughly; never dispensed neat onto dry cement or aggregate.
About MC-Bauchemie Centrament Flow 250
Centrament Flow 250 sits in the practical middle of MC-Bauchemie’s admixture range, built for contractors and ready-mix plants that need genuine polycarboxylate ether performance without reaching for a premium self-compacting grade. It is a light amber to clear aqueous liquid that disperses cement grains far more effectively than older naphthalene (SNF) chemistry, letting you drop the water content of a mix by roughly a fifth to a quarter and still keep the concrete flowing. The result is a denser, stronger, lower-permeability matrix at the same cement factor, which matters as much for the durability of a Delhi-NCR structure exposed to sulphates and chlorides as it does for the number on the cube-test report.
What makes this grade easy to specify is its breadth of compatibility. It works across OPC 53, PPC and PSC cements, holds a usable slump for 60 to 90 minutes even at 30 degrees C, and blends cleanly with other MC-Bauchemie admixtures such as retarders or air-entrainers when a job calls for them. For a batching plant running mixed grades through the day, that flexibility means one reliable superplasticiser covering the bulk of production rather than a shelf of single-purpose products. Space Arc Engineering supplies it as an authorised MC-Bauchemie channel partner with technical backup for trial mixes and dosage optimisation.
The technical insight
The performance comes down to how a PCE molecule is shaped. Centrament Flow 250 is a comb polymer: a carboxylate-rich backbone that anchors onto the surface of cement particles, with long polyethylene-oxide side chains that project outward into the water. Where an older SNF plasticiser relies mainly on electrostatic charge to push grains apart, those extended side chains add steric hindrance, physically wedging cement particles away from each other so they cannot flocculate. Freeing the water that would otherwise be trapped inside those flocs is what delivers the 20-28% water reduction at an unchanged slump. Because dispersion is driven by molecular geometry rather than charge alone, the effect holds up longer as the mix ages, which is why slump life is measured in tens of minutes rather than the sharp drop-off SNF admixtures suffer. Lowering the water-cement ratio at a fixed cement content is also the direct lever behind the 15-25% gain in 28-day compressive strength, since strength in hardened concrete tracks inversely with w/c ratio. A modest, controllable retardation of 15-30 minutes at standard dosage is a normal by-product of the chemistry and usually a help, not a hindrance, in warm Indian placing conditions.
Where it is used
- Pumped column and shear-wall concrete in the M25-M40 range for residential and commercial towers
- Precast production of beams, panels, staircases and boundary units needing early strength and clean demoulding
- Foundation, raft and pile-cap pours where a low water-cement ratio improves durability and reduces bleeding
- Elevated slabs and post-tensioned floors that must stay pumpable and workable through a long placing cycle
- Standard ready-mix supply where one admixture must cover several grades through a production shift
- Blockwork, paver and small precast goods manufacture calling for consistent flow at low water content
- Mass and structural concrete in aggressive ground where reduced permeability resists sulphate and chloride ingress
- General site batching for high-strength structural elements as a step up from naphthalene-based plasticisers
Key advantages
- Delivers 20-28% water reduction at standard dosage, well ahead of typical SNF superplasticisers
- Long-chain PCE chemistry holds a workable slump for 60-90 minutes even at 30 degrees C
- Lowers the water-cement ratio to lift 28-day compressive strength by roughly 15-25% at the same cement content
- Effective at a low 0.4-0.8% dosage by mass of cement, so a drum goes a long way
- Broadly compatible with OPC 53, PPC and PSC cements, simplifying stock for mixed-grade plants
- Combines cleanly with other MC-Bauchemie admixtures for tailored retardation or air entrainment
- Denser, lower-permeability concrete improves durability against sulphate and chloride attack
- Conforms to EN 934-2 and IS 9103, the recognised references for superplasticising admixtures
Limitations & considerations
- It is a mid-range grade; very high-slump self-compacting or high-early-strength work may need a higher-performance PCE
- PCE admixtures are sensitive to overdosing, which can cause bleeding, segregation or excess retardation, so trial mixes are essential
- Optimum dosage shifts with cement source, fines, temperature and w/c target and must be established for each mix, not copied blindly
- Should not be dispensed neat onto dry cement or aggregate; it must go through the mix water to disperse properly
- Slump retention still tapers in very hot weather or over long haul times and may need a retarder to extend placing windows
- As a water-based admixture it should be protected from freezing and used within its stated shelf life to perform as intended
Selection & best practice
Add Centrament Flow 250 to the gauging water or to the wet mix during batching, never straight onto dry cement or aggregate, and mix long enough for it to disperse fully. Always fix the working dosage with a site trial mix using the actual cement, sand and aggregate, then confirm slump, slump retention and cube strength before scaling to production. Start near the lower end of the 0.4-0.8% band and increase in small steps rather than chasing flow with a large single dose, since PCE responds sharply and overdosing shows up as bleeding, segregation or slow set. Reduce the mix water to bank the water reduction as strength; simply adding the admixture without cutting water gives flow but little of the durability benefit. In hot weather pair it with a compatible MC-Bauchemie retarder to protect the placing window, keep the drums shaded and stir gently after long storage. Store cool, keep from freezing and use within shelf life.
Specifications
| Chemical base | Polycarboxylate ether (PCE) comb polymer, liquid aqueous solution |
| Appearance | Light amber to clear aqueous liquid |
| Function | Mid-range water-reducing superplasticiser admixture |
| Typical dosage | 0.4-0.8% by mass of cement |
| Water reduction | 20-28% at standard dosage versus control concrete |
| Slump retention | 60-90 minutes at 30 degrees C |
| Effect on setting | Slight retardation of about 15-30 minutes at standard dosage |
| Strength effect | Approx. 15-25% higher 28-day compressive strength at equivalent w/c |
| Standards | EN 934-2 (Table 1.1, superplasticisers); IS 9103 |
Industry use cases
Ready-Mix Concrete
A single dependable superplasticiser covering M25-M40 output through a shift, with slump life long enough for transit and pumping to upper floors.
Precast Manufacturing
Low water-cement ratio for higher early strength, faster demoulding cycles and clean, defect-free faces on beams, panels and staircases.
High-Rise Structures
Pumpable, workability-retaining concrete for columns, shear walls and slabs where placing runs long and cube strength targets are strict.
Foundations and Substructure
Reduced water and permeability in rafts, pile caps and footings improves durability in aggressive sulphate or chloride-bearing ground.
Infrastructure and General Contracting
A cost-effective upgrade from naphthalene plasticisers for structural pours needing better strength and flow at a controlled dosage.
Frequently asked questions
How much Centrament Flow 250 do I add per bag of cement?
How is it different from a naphthalene (SNF) superplasticiser?
Which cements does it work with?
How long will the concrete stay workable?
Will it delay the setting time?
Can I mix it with other MC-Bauchemie admixtures?
How we position MC-Bauchemie Centrament Flow 250
Centrament Flow 250 is the sensible mid-range choice within MC-Bauchemie’s Centrament Flow superplasticiser family for routine M25-M40 structural and precast work. Where a project demands very high slump, self-compacting behaviour or higher early strength, step up to a higher-performance grade in the same MC-Bauchemie PCE range and pair it with a compatible Centrament retarder for long hot-weather pours. For sites already standardised on other brands we stock, the equivalent duty is met by Fosroc’s Auramix PCE range or Sika’s ViscoCrete admixtures; our team can match dosage and mix design across whichever brand family a specifier prefers. Space Arc supplies and advises on all of these as an authorised distributor and applicator.
Fosroc Auramix 200 — Choose Auramix 200 when a project or approval is already standardised on Fosroc, as it is a directly comparable new-generation PCE high-performance superplasticiser for flowable, pumpable and precast concrete.
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