MC-Bauchemie Emcekrete Type A6
MC-Bauchemie’s ready-to-use, non-shrink micro-concrete for precast joints and structural repairs up to 150 mm in a single pour — high early strength, chloride-free, pour or pump placement.
What is it?
A hydraulically setting, polymer-modified, non-shrink micro-concrete from MC-Bauchemie, supplied as a 30 kg sack (20 kg cementitious powder plus 10 kg pre-graded 6 mm aggregate, packed separately) — mix with water on site and pour.
Where is it used?
Rigid joints between precast elements or between precast and in-situ concrete, structural repairs to beams, columns and bridge supports, and micro-concreting around embedded steel and fastening bolts, wherever the repair depth runs from about 25 mm up to 150 mm in a single pour.
Why use it?
It stays flowable at a very low water-powder ratio, reaches 25 N/mm² within 24 hours and 70 N/mm² at 28 days, and is classified non-shrink to ASTM C1107 Grade A, so the repaired section bonds tight to the surrounding concrete and stays dimensionally stable under load.
How is it applied?
Add 2.7-3.3 litres of water per 30 kg sack (9-11% by weight), mix the powder into the water first, fold in the pre-packed 6 mm aggregate, and pour continuously from one side into rigid, leak-proof, pre-soaked formwork within the 30-60 minute working time; it can also be placed with a concrete pump.
About MC-Bauchemie Emcekrete Type A6
MC-Bauchemie built Emcekrete Type A6 to solve a specific site problem: a standard cementitious grout is sand-fine and struggles once a repair or joint gets deeper than 50-75 mm, because the cement-rich paste generates enough heat and shrinkage stress to crack. Type A6 sidesteps that by pre-blending a 6 mm-down graded aggregate into the bag alongside the polymer-modified cementitious powder, so a single 30 kg sack (20 kg powder plus 10 kg aggregate, packed separately for site mixing) behaves like a proper micro-concrete rather than a stretched grout. Add roughly 3 litres of water, mix, and pour — it flows to 200 mm on the IS 5512 cone at a water-powder ratio most grouts would call unworkable, then goes on to post 25 N/mm² inside 24 hours and 70 N/mm² at 28 days, classified non-shrink to ASTM C1107 Grade A.
For Space Arc’s Delhi NCR and pan-India project base, that combination matters most on precast work — metro segment joints, box culverts, panel-to-panel connections — and on structural repair where a beam, column or bridge pedestal has spalled or been cut back and needs a full-depth pour rather than a thin patch. We’ve applied it where formwork constraints or reinforcement congestion ruled out recasting in conventional concrete, and where the contractor needed the shutter off and load back on within a day. It is not a universal repair mortar — thin patches, vertical trowel work and overhead ceiling soffits are better served by MC-Bauchemie’s polymer repair mortars — but for 25-150 mm formed pours it removes the guesswork of site-extending a grout with loose aggregate, which is where most on-site batching errors happen.
The technical insight
The detail that separates Emcekrete Type A6 from an ordinary non-shrink grout is what’s inside the bag before you add water: 10 kg of 6 mm-down graded aggregate, packed separately from the 20 kg cementitious powder and combined only at the mixer. Most site teams achieve depth with a plain grout by hand-extending it with loose aggregate — a practice that works only as well as whoever is shovelling that day gets the ratio right. Pre-blending the aggregate at the factory fixes that ratio, which is also what lets the product carry a genuine 150 mm single-pour rating instead of the 50-75 mm ceiling typical of sand-only grouts, because the coarser aggregate lowers the cement paste fraction and with it the heat of hydration and shrinkage stress that cause thick pours to crack. The trade-off MC-Bauchemie engineered around is workability: at a water-powder ratio of just 0.09-0.11, a mix this lean would normally be unpourable, so the formulation leans on polymer modification and a controlled 1-2% expansion (ASTM C827) to hit 200 mm flow on the IS 5512 cone without excess water. That expansion is what earns the ASTM C1107 Grade A non-shrink classification — it happens in the plastic state, offsetting settlement and shrinkage before the mix sets, rather than being a passive “doesn’t shrink much” claim. It’s also why the working time collapses from 60 minutes at 5°C to just 30 minutes at 35°C: the same chemistry that gives fast early strength gain (25 N/mm² in 24 hours) accelerates hard in Indian summer site conditions, which is the number crews most often misjudge.
Where it is used
- Micro-concreting of rigid joints between precast elements, or between precast elements and in-situ concrete
- Structural repair of concrete beams, columns, bridge supports and other load-bearing members needing a full-depth formed pour
- Micro-concreting around steel constructions, fastening bolts and embedded steel elements cast into concrete
- Filling deep anchor-bolt pockets and holding-down sleeves that exceed the depth a standard precision grout is rated for
- Bridge bearing pedestal and nib repairs where 100-150 mm depth needs a single formed pour
- Making good honeycombed, spalled or cut-back sections of columns and beams during retrofit and strengthening work
- Void filling behind or under precast panels, box culverts and segmental sections
- Repair pours in confined or congested formwork where consistent flow to depth matters more than trowel access
Key advantages
- Stays pourable and flowable at a genuinely low water-powder ratio (9-11%), so strength isn’t sacrificed for workability the way it is with over-watered site mixes
- Non-shrink to ASTM C1107 Grade A keeps the repaired section in full bearing contact with the surrounding concrete instead of pulling away as it cures
- High early strength — 25 N/mm² inside 24 hours — lets contractors strike formwork and reopen the area fast, which matters on live infrastructure and plant shutdowns
- Reaches 70 N/mm² at 28 days (ASTM C-109, 70 mm cube), comfortably matching or exceeding the parent concrete in most structural repair situations
- Chloride-free, so it doesn’t add corrosion risk to the reinforcement or embedded steel it’s being poured around
- The 6 mm aggregate is pre-blended into the bag, removing the on-site guesswork (and inconsistency) of hand-extending a plain grout with loose aggregate for deeper pours
- Can be placed by gravity pour or pumped, which helps in congested reinforcement or where the formwork geometry limits access to one pour point
- Single-sack, factory-proportioned supply cuts batching variation between mixes on the same job
Limitations & considerations
- 150 mm is the rated maximum thickness for a single pour — deeper sections need a staged pour or a different repair design, not more water or a thicker mix
- Working time drops to just 30 minutes once ambient or substrate temperature nears 35°C, which demands disciplined batch sizing on a Delhi or NCR summer site
- Placement is restricted to a 5°C-35°C air and substrate window; below 5°C the ground and contact areas need warming before pouring
- Formwork has to be genuinely rigid, leak-proof and pre-soaked — a poorly sealed shutter causes grout loss, honeycombing and surface blemishes
- It’s a cementitious system, not an epoxy grout — not the right choice where oil contamination, aggressive chemical exposure or very high impact loading is expected
- Shelf life is 6 months in unopened packaging and shorter in humid or monsoon-exposed storage, so stock rotation on site matters
Selection & best practice
Treat the water dose as the one variable you can’t eyeball — 2.7 to 3.3 litres per 30 kg sack is a narrow band, and going over it for the sake of easier pouring costs you strength and pushes the mix toward bleeding and segregation. Presoak the substrate and the formwork thoroughly; the shutter has to be genuinely rigid and leak-proof, sealed at every joint, because Type A6’s flowability that makes it pour well is exactly what finds every gap in bad formwork. Batch only what you can place in the working window — 30 minutes once ambient or substrate temperature is near 35°C, which in a Delhi or Gurugram summer afternoon arrives faster than site teams expect — and pour continuously from one side so trapped air and displaced pre-soak water have somewhere to escape rather than forming voids. Avoid vibrating the poured micro-concrete for at least two hours; unlike conventional concrete it doesn’t need it and over-vibration can disturb the non-shrink expansion. Once placed, cure it like structural concrete, not like a thin repair patch — MC-Bauchemie’s own Emcoril curing compounds, wet hessian, or ponded water on horizontal sections all work; skipping cure on a 100-150 mm pour risks surface crazing even though the bulk strength is unaffected.
Specifications
| Product type | Free-flow, non-shrink hydraulic micro-concrete, polymer-modified (grey powder + graded aggregate) |
| Aggregate grain size | 6 mm down |
| Mixing water | 2.7-3.3 litres per 30 kg sack (9-11% by weight) |
| Flow | 200 mm at W/P 0.10, per IS 5512 (Ø70/100×50 mm cone) |
| Compressive strength (ASTM C-109, 70 mm cube, W/P 0.10) | 25 N/mm² @ 24 hours; 65 N/mm² @ 7 days; 70 N/mm² @ 28 days |
| Expansion | 1-2%, per ASTM C827 |
| Non-shrink classification | ASTM C1107 Grade A |
| Working/application time | 60 / 45 / 30 minutes at +5°C / +20°C / +35°C |
| Pack size & yield | 30 kg sack (20 kg powder + 10 kg aggregate, packed separately); yields approx. 14.25 litres |
Industry use cases
Precast & Infrastructure
Joint filling between precast box culverts, segmental tunnel linings, precast panels and metro/flyover deck segments, where a formed, flowable pour beats hand-packed mortar for consistency.
Bridges & Flyovers
Bearing pedestal, nib and expansion-joint repairs on bridges and flyovers where 100-150 mm depth needs a single formed pour and fast strength gain to reopen lanes or reset bearings.
Industrial & Power
Repair of spalled or cut-back RCC columns, beams and machine foundation edges around embedded steel brackets in plants and process areas needing fast turnaround.
Residential & Commercial Retrofit
Repair of spalled RCC columns and beams in basements, parking structures and podiums during retrofit, where fast formwork strike matters for site sequencing.
Water & Sewage Infrastructure
Repair of precast pipe joints, manhole sections and utility chamber connections where a chloride-free, non-shrink fill is specified.
Frequently asked questions
How is Emcekrete Type A6 different from a standard precision grout like Fosroc Conbextra GP2?
Can I extend Type A6 further with extra aggregate for pours deeper than 150 mm?
How much water do I add per bag, and does the ratio really matter that much?
Can Type A6 be pumped instead of poured by hand?
Is it safe to place directly against reinforcement and embedded steel?
What curing does it need after placing?
How we position MC-Bauchemie Emcekrete Type A6
Emcekrete Type A6 sits in MC-Bauchemie’s micro-concrete and structural-repair range alongside products like ombran MHP rapid, MC-Bauchemie’s fast-setting sulphate-resistant repair mortar for sewage and utility infrastructure — the two get specified together on projects where a repair needs both a formed structural pour (Type A6) and a hand-applied patch or lining (ombran). Within the wider Emcekrete family, Type A6 is the coarse-aggregate, 100-150 mm depth option; where MC-Bauchemie’s Type A or finer grouting grades are already in the spec book for shallower joint work, we can supply those alongside it rather than substituting. For projects standardised on a different house brand, Fosroc’s Conbextra GP2 is the closest cross-brand comparison — a genuine non-shrink cementitious grout with strong strength figures of its own — though it’s built and tested as a precision base-plate grout rather than a pre-blended micro-concrete, so the fit is closest at the shallow end of Type A6’s range and weaker for deeper structural repair pours. As an authorised MC-Bauchemie distributor and applicator, Space Arc supplies Emcekrete Type A6 ex-stock across Delhi NCR and pan-India and can map a specification written around any competing brand back to the correct MC-Bauchemie or Fosroc equivalent.
Fosroc Conbextra GP2 — A specifier already standardised on Fosroc for base-plate and precision grouting, or working with pours under 100 mm that will be site-extended with 10 mm aggregate, might reasonably choose Conbextra GP2 instead — though it’s tuned for machine-foundation precision grouting rather than pre-blended structural micro-concrete, so for 100-150 mm repair and joint-fill pours Emcekrete Type A6 remains the more direct fit.
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