Want to finish the concrete repair the same day? Normal mortar sets by the next day — you can’t complete the job. Geolite sets in 40 minutes, is loadable and paintable after 4 hours. R4 strength, for medium and large surfaces. This is Kerakoll Geolite 40.
Geolite is the first geo-mortar for repairing damaged reinforced concrete: Kerakoll geo-binder, with near-zero shrinkage and high chemical resistance.
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Same-day handover, medium-large surfaces: semi-fast, 40-minute setting — you work, set, and finish in one day
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Easy to apply yet fast: 40-minute working window, but paintable after 4 hours — can be coated with MicroSilicato
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Load-bearing repair: Class R4, 28 days > 45 N/mm² — structural strength, not just patching
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Rusting reinforcing steel: pH ≥ 12.5 alkaline chemistry passivates the steel (EN 1504-7) — stops corrosion
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Works even in cool weather: setting at +5 °C ≈ 180–195 minutes — work does not stop in cold conditions
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Does not run on overhead or vertical surfaces: thixotropic consistency — 2–40 mm in one layer
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Exposed to precipitation, wet locations: waterproof — suitable for outdoor, exposed structures
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Non-combustible: A1 fire resistance class — geo-binder based, mineral composition
| Type |
Semi-fast thixotropic concrete repair geo-mortar (for outdoor and indoor use) |
| Binder |
Mineral geo-binder, inorganic |
| Performance |
Class R4 (EN 1504-3); compressive strength 28 days > 45 N/mm² |
| Layer thickness |
min. 2 mm – max. 40 mm / layer |
| Setting time |
semi-fast, ≈ 40 minutes · loadable/paintable after 4 hours |
| Material requirement |
≈ 17 kg/m²/cm; 25 kg ≈ 1.5 m² (10 mm layer) |
| Packaging |
Bags 25 / 15 / 5 kg |
| Storage |
≈ 12 months |
What is it suitable for?
Substrates: Healthy, load-bearing reinforced concrete and concrete — both outdoor and indoor. Repair of damaged, chipped, and eroded concrete structures. On horizontal concrete after Primer Uni substrate preparation.
Usage: Local and general restoration, smoothing, and monolithic protection of reinforced concrete structures; passivation of reinforcing steel; precision anchoring of rods, base plates, and machinery. Especially suitable for medium and large surface interventions where fast execution and same-day handover are the goal.
Not suitable for: contaminated, loose, crumbling, or dusty substrates; gypsum, metal, or wood; surfaces below +5 °C, above +40 °C, or frozen; very fast fixing where it must set within minutes (use Geolite 10 for that); pouring into formwork (use Geolite Magma for that).
The Geolite concrete repair system
| 1. Substrate preparation |
Primer Uni — adhesion and absorption control on horizontal concrete |
| 2. Repair mortar |
Geolite 40 — this product, R4 repair, 2–40 mm, same-day delivery |
| 3. Protective topcoat |
Geolite MicroSilicato — breathable, carbonation-resistant |
Which Geolite mortar do you need?
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Manual/machine repair, large surface, 2–40 mm, if you have time (80 minutes): Geolite — R4, the basis of the Geosteel SRG system
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Same-day delivery, semi-fast (40 minutes): Geolite 40 — this product, R4, waterproof, paintable after 4 hours
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Fast fixing, anchoring, in cold (10 minutes): Geolite 10 — R4, waterproof
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Poured into formwork, 10–100 mm: Geolite Magma — pourable, R4 (anchoring: Magma 20, fiber-reinforced FRC: Xenon)
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Lightweight aesthetic smoothing, non-structural (2–50 mm): Geolite Silt — R2
Frequently asked questions
How can concrete repairs be sealed the same day?
With a semi-fast setting, R4 class concrete repair mortar that sets in 40 minutes and can be painted after 4 hours. With Geolite 40, you can remove, repair, and seal the surface in one day — no need to return the next day. The fast-setting material is suitable for medium and large surface jobs.
How long does it take to set, and when can it be painted?
The setting time of Geolite 40 at +21 °C is approximately 40 minutes, and it can be loaded and painted after 4 hours. It sets slower in cold conditions: at +5 °C about 180–195 minutes. It sets faster in warm conditions — at +30 °C about 25–30 minutes.
What does the R4 class mean for concrete repair mortar?
R4 is the highest structural repair mortar class according to EN 1504-3. Suitable for restoring high-strength, load-bearing structures — Geolite 40 has a 28-day compressive strength > 45 N/mm². R3 and R2 are weaker, for non-structural repairs.
Geolite, Geolite 40, or Geolite 10 — which one do I need?
All three are R4 thixotropic concrete repair mortars, only the setting time differs. Geolite 40 is semi-fast (40 minutes) — comfortable application and same-day handover. Geolite 10 is fast (10 minutes), for fixing and cold conditions. Geolite is normal (80 minutes), for large areas and machine application.
Is the concrete repair paintable and waterproof?
Geolite 40 is waterproof, and the repair can be painted after 4 hours. It can be used outdoors on structures exposed to precipitation. For breathable protection against carbonation, apply Geolite MicroSilicato paint.
Is a primer needed under the concrete repair mortar?
Not on vertical, healthy concrete — just wet the surface until saturated. On horizontal concrete surfaces, Primer Uni substrate preparation is recommended for proper absorption. The substrate must always be clean, solid, and rough.
How many m² does a 25 kg bag cover?
Material requirement ≈ 17 kg/m² per centimeter. For 10 mm repairs, a 25 kg bag covers ≈ 1.5 m²; for 20 mm, ≈ 0.7 m². Thicker layers should be applied in multiple passes, max. 40 mm per layer.
When should I NOT use this concrete repair?
For quick setting within minutes (fast fixing), use Geolite 10; for long, calm application over large areas, use Geolite. Do not apply on contaminated, loose, dusty substrates, gypsum, metal, wood, or frozen surfaces.
Can I apply it myself?
Small, surface concrete repairs can be done by an experienced hand: demolition, cleaning, wetting, application. Structural restoration requires static knowledge — load-bearing capacity depends on it. We also undertake complete execution.
