MC-Bauchemie MC-PowerFlow Micro-Concrete
A self-compacting, shrinkage-controlled micro-concrete that flows around dense reinforcement and rebuilds structural sections to EN 1504-3 Class R4 strength.
What is it?
A factory-blended, free-flowing micro-concrete from MC-Bauchemie for reinstating structural concrete sections. It arrives as a dry powder needing only site-added water and is classified EN 1504-3 Class R4, the highest structural repair grade.
Where is it used?
Columns, piers, bridge beams and caps, heavily reinforced soffits, silo and chimney walls, tunnel linings and marine structures where hand-applied mortar cannot reach behind congested steel.
Why use it?
It self-compacts under its own weight, so it fills tight rebar cages fully without vibration, then cures to a low-shrinkage, high-strength repair that behaves like the parent concrete.
How is it applied?
Fix formwork around the prepared, saturated substrate, mix the powder with clean water to a flowable consistency, and pour or pump it in from one side in a continuous operation at 30 mm or more per lift.
About MC-Bauchemie MC-PowerFlow Micro-Concrete
MC-PowerFlow is MC-Bauchemie’s free-flowing micro-concrete for structural repair and section reinstatement. It is supplied as a factory-premixed dry blend of graded aggregates, cement and performance admixtures, so the only site variable is the water you add. That controlled formulation is what lets a contractor pour a consistent, self-levelling repair batch after batch, rather than chasing a workable mix by hand at the scaffold. Because it is designed to consolidate under gravity, it belongs to the family of pourable repair materials specified when a section has lost cover, spalled, or been cut back to sound concrete and needs to be built back to full load-carrying capacity.
In practice, engineers reach for MC-PowerFlow on the repairs that defeat trowel-applied mortars: deep reinstatements, congested reinforcement, and pours where access is restricted to one face. The material is placed into formwork and flows to encase every bar, so the repaired zone is monolithic and the steel is fully re-passivated. Classified to EN 1504-3 as a Class R4 structural repair product, it carries the strength, bond and durability credentials that consultants ask for on bridges, industrial structures and marine assets across India, where chloride and carbonation attack make a robust, low-permeability reinstatement essential.
The technical insight
The behaviour that defines a micro-concrete like MC-PowerFlow is self-compaction. The mix is engineered with a carefully graded aggregate skeleton (up to around 8 mm) and high-range water-reducing admixtures so it stays fluid at a low water content. That combination gives two things at once: enough flow to travel horizontally through a dense rebar cage and fill every void by gravity, and a low enough water-cement ratio to develop dense, durable, high-strength concrete once cured. Ordinary site concrete would need poker vibration to achieve the same compaction, which is impossible where bars are only a few millimetres apart. The second mechanism is shrinkage control. Fresh-state and hardening shrinkage is compensated through the admixture package, so the repair does not pull away from the substrate or micro-crack at the bond line as it sets. The result is a repair that stays in intimate contact with the parent concrete, transfers load across the interface, and re-establishes the alkaline environment the reinforcement needs to resist further corrosion.
Where it is used
- Reinstating spalled or cut-back reinforced concrete columns and piers
- Repairing bridge beams, cross-heads and pier caps with congested reinforcement
- Rebuilding heavily reinforced beam and slab soffits from below
- Section reinstatement in silos, bunkers and industrial chimney walls
- Structural repair of tunnel linings and underground structures
- Rehabilitation of marine and coastal structures exposed to chloride attack
- Deep repairs where access is limited to a single face and formwork can be fixed
- Encasing and re-passivating exposed reinforcement after corrosion removal
Key advantages
- Self-compacting flow fills congested rebar cages fully without any vibration
- EN 1504-3 Class R4 classification, the highest structural repair grade
- Factory-premixed blend gives repeatable consistency batch to batch on site
- Shrinkage is compensated, so the repair stays bonded and crack-free at the interface
- Only clean water is added on site, reducing mixing error and QA overhead
- Placed by pour or pump, suiting deep and single-face-access repairs
- Develops high compressive and bond strength for full load reinstatement
- Low-permeability cured matrix resists chloride and carbonation ingress
Limitations & considerations
- Requires formwork, which adds time and cost versus hand-applied patch mortars
- Needs a minimum repair depth per lift, so it is unsuited to thin or feathered repairs
- Substrate must be properly prepared, saturated surface-dry and free of loose material
- Flowability is water-sensitive; over-watering reduces strength and durability
- Not a cosmetic finishing product, a separate levelling or protective coat is usually needed
- Best placed continuously from one side to avoid trapping air behind reinforcement
Selection & best practice
Break out to sound concrete, expose corroded bars fully around their circumference, and clean the steel back to bright metal before priming as specified. Erect leak-tight formwork with a pour point on one side and, for larger volumes, a head box to maintain flow pressure. Bring the substrate to a saturated surface-dry condition so it does not draw water from the mix. Add only clean water within the recommended dosage and mix mechanically to a uniform, lump-free flowable batch. Pour or pump from a single point and let the material travel across, so air is pushed ahead of the front rather than trapped behind bars, and place in a continuous operation without cold joints. Keep each lift at or above the minimum depth, then cure the exposed surfaces thoroughly to protect early strength and control shrinkage. On deep or large pours, confirm placement depth and thickness limits for the batch with the manufacturer’s data before starting.
Specifications
| Product type | Factory-premixed self-compacting (free-flowing) micro-concrete |
| Standard / classification | EN 1504-3, Class R4 (structural repair) |
| Application method | Form-and-pour or pump, no mechanical vibration required |
| Maximum aggregate size | Up to 8 mm (grade dependent) |
| Minimum repair depth | 30 mm per lift |
| Shrinkage | Compensated via admixture package |
| Site addition | Clean water only |
Industry use cases
Bridges & Highways
Reinstating pier caps, cross-heads and beam sections where reinforcement is dense and chloride-driven spalling has reduced cover.
Industrial Structures
Rebuilding silo, bunker and chimney walls that need full-strength structural repair with reliable, repeatable pours.
Marine & Coastal
Restoring jetty, sea-wall and splash-zone elements attacked by chlorides, using a low-permeability R4 reinstatement.
Buildings & Car Parks
Repairing heavily reinforced beam and slab soffits from below where vibration is impossible and access is single-face.
Tunnels & Underground
Section reinstatement of linings and buried structures where a pourable, self-compacting material reaches confined zones.
Frequently asked questions
Is MC-PowerFlow a structural repair material?
Do I need to vibrate MC-PowerFlow after pouring?
What is the minimum thickness I can apply?
How is it mixed on site?
Where does MC-PowerFlow work better than a hand-applied mortar?
Can I buy MC-PowerFlow in Delhi NCR and elsewhere in India?
How we position MC-Bauchemie MC-PowerFlow Micro-Concrete
MC-PowerFlow sits at the pourable end of a full concrete-repair system. On an MC-Bauchemie job it pairs with the range’s reinforcement primers and bonding coats for steel protection and interface bond, and with the Nafufill family of hand-applied repair mortars for the shallower, trowel-grade patches that a flowable micro-concrete is not suited to. Where a specifier is standardised on another brand, our Fosroc equivalent is Renderoc RG, and we also carry Dr. Fixit and Sika repair systems, so the material can be matched to the approved vendor list on a given project rather than forcing a single brand.
Fosroc Renderoc RG — Choose Renderoc RG when the project is standardised on Fosroc or the approved-vendor list calls for it; it is a directly equivalent free-flowing, shrinkage-compensated R4 micro-concrete for congested, hard-to-vibrate reinstatements.
Related Concrete Repair products
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