MC-Bauchemie MC-Crete 410
An integral crystalline admixture that turns the concrete itself into the waterproofing layer, sealing pores and fine cracks throughout the full depth of the pour.
What is it?
A dry crystalline waterproofing admixture from MC-Bauchemie, dosed into the concrete mix at the batching plant to make the whole section water-resistant.
Where is it used?
Below-ground and water-retaining concrete: basement rafts, retaining walls, tunnels, pile caps, treatment plants and storage tanks.
Why use it?
It waterproofs the mass of the concrete rather than a surface film, so it cannot be punctured or debonded, and it reactivates to self-seal fine cracks that form later.
How is it applied?
Added at 1.0-2.0% by mass of cementitious content during batching, either dry-dosed or dispersed in the mixing water, then placed and cured normally.
About MC-Bauchemie MC-Crete 410
MC-Crete 410 is MC-Bauchemie’s integral crystalline waterproofing admixture, engineered for structures where a leak is not an option and where a coating simply is not a reliable long-term answer. Instead of relying on a membrane or a brush-applied layer on the outside of the slab, this product is blended into the concrete at the RMC plant so that the waterproofing becomes part of the material itself. The crystalline chemistry travels with the mix into every corner of the pour, which means the protection is exactly as continuous as the concrete is, with no laps, no primer, and no bond line that can fail years down the line.
For engineers and contractors working on deep basements, tunnels or water-retaining structures across Delhi NCR and the rest of India, that distinction matters on site. Membranes get torn during backfilling, punctured by reinforcement chairs, or left with weak overlaps that only reveal themselves once the structure is in service and impossible to reach. A mass-waterproofed section removes that whole category of risk. Because MC-Crete 410 is a dry, chloride-free powder that carries no significant strength penalty, it slots into a structural concrete specification without forcing a redesign of the mix, and it keeps working for the design life of the structure without any maintenance.
The technical insight
The active ingredients in MC-Crete 410 are proprietary reactive chemicals carried on Portland cement. Once in the mix, they react with moisture and the free lime and unhydrated cement already present in concrete to grow dense, needle-like calcium silicate hydrate crystals inside the capillary pores and micro-voids. These crystals physically fill the very pathways that water would otherwise travel through, dropping permeability throughout the section rather than just at the face. The genuinely useful part is what happens later: a portion of the crystalline chemistry stays dormant. If a fine crack opens up, up to roughly 0.4 mm, and water reaches it, that dormant chemistry reactivates in the presence of moisture and grows fresh crystals to seal the crack on its own. In practical terms the concrete has a built-in healing response to the exact failure mode, hairline cracking, that defeats most rigid waterproofing systems.
Where it is used
- Basement raft slabs and perimeter retaining walls in deep excavations
- Metro and underground rail tunnel linings and cut-and-cover boxes
- Water treatment plant tanks, channels and clarifier structures
- Elevated and ground-level water storage tanks and reservoirs
- Pile caps and foundation elements below the water table
- Sewage and effluent treatment structures exposed to constant moisture
- Lift pits, sumps and other buried service enclosures
- Podium slabs and other water-retaining or water-excluding concrete elements
Key advantages
- Waterproofs the full depth of the concrete, so protection cannot be punctured, torn or debonded like a membrane
- Dormant crystalline chemistry reactivates to self-seal fine cracks up to 0.4 mm as they form
- Chloride-free formulation compatible with reinforced structural concrete under IS 456
- No significant loss of 28-day compressive strength when dosed correctly
- Dosed at the batching plant, removing a separate membrane trade and its programme time
- Effective even under permanent hydrostatic head, ideal for structures below the water table
- Requires no maintenance, re-coating or inspection access over the service life
- Continuous protection with no laps, primers or bond lines to detail and get wrong
Limitations & considerations
- Must be added during batching; it cannot be dosed into concrete that has already left the plant or splashed onto a truck
- Self-sealing is limited to fine cracks up to about 0.4 mm and will not bridge structural movement or wide gaps
- Effective sealing depends on a sound, well-compacted mix, minimum C30/C35 with w/c not above 0.45 and cement content around 380 kg/m3
- Needs a full 14-day minimum wet cure to develop crystals fully; poor curing undermines the whole system
- Does not treat construction joints on its own; these still require hydrophilic waterstops or a joint system
- It is not a repair coating for an already-built leaking structure; it is designed into the concrete from the start
Selection & best practice
Treat MC-Crete 410 as part of the concrete specification, not an afterthought. Fix the dosage with the RMC supplier up front, typically 1.0-2.0% by mass of cementitious content, and add it at the plant by dry dosing or as a dispersion in the mixing water; never let anyone top up water in the truck to recover slump, as that both dilutes the chemistry and raises the w/c ratio. Design the mix to a minimum C30/C35 with a maximum w/c of 0.45 and a cement content near 380 kg/m3 so the crystalline reaction has the free lime it needs. On site, the two things that most often let a mass-waterproofed structure down are curing and joints, so protect the concrete for a full 14 days of wet curing and detail every construction joint with a hydrophilic waterstop. Confirm the final dosage with a trial mix and, where the spec calls for it, water-permeability testing to EN 12390-8.
Specifications
| Product type | Integral crystalline waterproofing admixture (dry powder) |
| Active chemistry | Reactive crystalline chemicals on a Portland cement carrier |
| Dosage | 1.0-2.0% by mass of cementitious content |
| Self-sealing crack width | Up to 0.4 mm |
| Chloride content | Chloride-free (compliant with IS 456 Table 5) |
| Recommended concrete grade | Minimum C30/C35, maximum w/c ratio 0.45 |
| Minimum cement content | 380 kg/m3 |
| Effect on strength | No significant reduction in 28-day compressive strength |
| Water permeability testing | To EN 12390-8 |
Industry use cases
Deep basements & high-rise podiums
Mass-waterproofs raft slabs and retaining walls where external membranes are unreachable for repair once backfilled, and where hydrostatic pressure is permanent.
Metro & tunnelling
Builds waterproofing into segmental and cut-and-cover linings so protection is continuous with the concrete and survives handling and backfill.
Water & wastewater infrastructure
Keeps treatment tanks, channels and reservoirs watertight from within, with a chloride-free formulation suited to reinforced retaining structures.
Foundations below the water table
Protects pile caps, lift pits and sumps that sit in permanently wet ground, where surface systems are hard to apply and harder to maintain.
Public & institutional projects
Gives consultants a maintenance-free, full-depth waterproofing route for long-life civic structures where future access for re-coating is impractical.
Frequently asked questions
How is MC-Crete 410 different from a waterproofing membrane?
Does it really self-heal cracks?
Will it reduce the strength of my concrete?
Can it be added on site to concrete already in the truck?
Does using it mean I can skip waterstops at joints?
Is it suitable for potable water tanks and treatment structures?
How we position MC-Bauchemie MC-Crete 410
MC-Crete 410 is the right call when you want waterproofing designed into the structural concrete rather than added on afterwards, and where hydrostatic pressure and inaccessible surfaces rule out membranes. Where the specification is Fosroc-led, the direct equivalent from Space Arc’s Fosroc range is Conplast Crystalline, another integral crystalline admixture, while Conplast X421IC (Conplast WL) offers a simpler plasticiser-based integral route for less demanding, lower-head applications. For the joints that no admixture waterproofs on its own, pair MC-Crete 410 with hydrophilic waterstops and joint sealants, and for structures needing a belt-and-braces external system, combine mass waterproofing with a Fosroc Proofex membrane or a Brushbond crystalline coating. Space Arc supplies MC-Bauchemie and Fosroc alongside our other brands, so the mix design and joint detailing can be specified as one coordinated system.
Fosroc Conplast Crystalline — Choose this when the project is standardised on Fosroc; it is an equivalent integral crystalline admixture that self-seals fine cracks and waterproofs the full concrete section in the same way.
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