Precision Epoxy Grouting Solutions for Structural Repairs and Crack Injection
Precision Epoxy Grouting Solutions for Structural Repairs and Crack Injection
Concrete cracks are inevitable — but with the right products, their repair can be lasting, reliable, and structurally sound. The MR. JO Inject series offers a range of specialized epoxy grouts tailored to tackle everything from fine hairline cracks to wide structural voids, even under damp or challenging site conditions.
Whether it’s a leaking tank, cracked column, honeycombed concrete, or sensitive floor slab, there’s a Mr. JO Inject product ready to restore strength, integrity, and watertightness.
🧰 Why Use Injection Grouts?
🧠Non-Destructive Repair
Inject grouts penetrate deep into cracks and gaps without needing to demolish or rebuild.
🧪High Bond Strength
Chemically bonds with concrete to restore monolithic strength.
🌧️Water Resistance
Ideal for both dry and damp environments—no compromise on durability.
🛠️Versatile Application
Inject into walls, slabs, beams, tanks, sumps, and foundations.
⚠️Essential for Structural Cracks
Especially in load-bearing elements like beams and columns.
🧾 Product Selector Table
| Product Name | Viscosity | Pot Life @25°C | Mixing Ratio (PBW) | Special Feature | Ideal For |
| MR. JO Inject – VL | Very Low | 30–40 mins | 100:30 | Deep penetration into hairline cracks | Hairline cracks, fine capillaries, early strength zones |
| MR. JO Inject – LV | Low | 100–120 mins | 100:50 | Standard all-purpose injection grout | Structural repairs, small to medium cracks (0.3–1.5 mm) |
| MR. JO Inject – MV | Medium-Low | 120–150 mins | 100:50 | Slightly thicker for wider cracks | Medium-width cracks, vertical/overhead repairs |
| MR. JO Inject – UPS | Low | 20–30 mins | 100:40 | Cures on damp/moist surfaces | Water tanks, wet basements, poor-prep sites |
🧱 Support Product: MR. JO Tecseal – CRP
| Product | Purpose |
| MR. JO Tecseal – CRP | Thixotropic epoxy paste to fix nipples and seal cracks before pressure injection |
🧪 System Usage & Application Guide
🔧 Step-by-Step Procedure for Crack Injection:
- Crack Preparation
- Cut a V-groove (~10×10 mm) along the crack.
- Clean with oil-free compressed air.
- Fixing Nipples
- Drill holes (15–30 cm spacing).
- Use Mr. JO Tecseal – CRP to seal nipples and the surface.
- Allow to cure (typically 24 hours).
- Air Blow Check
- Blow through each nipple to ensure channels are clean.
- Injection Process
- Use suitable pressure gun (50–100 psi).
- Start from lowest point and move upward.
- Inject until epoxy exits the next nipple, then shift.
- Post-Cure
- Remove or cut nipples after epoxy cures.
- Finish surface if needed.
🎯 Choosing the Right Grout
| Situation | Recommended Grout |
| Hairline cracks, micro-fissures (<0.3 mm) | MR. JO Inject – VL |
| General structural repair (0.3–1.5 mm cracks) | MR. JO Inject – LV |
| Slightly wider cracks, vertical/angled elements | MR. JO Inject – MV |
| Wet, damp, or under-prepared surfaces | MR. JO Inject – UPS |
| For fixing nipples, sealing crack lines | MR. JO Tecseal – CRP |
🔒 Precautions & Best Practices
- Do not inject into active water leaks without pre-sealing.
- Always check pot life and ambient temperature during application.
- Avoid air entrapment—ensure cracks are free from dust and oil.
- Use gravity pour for wide, horizontal cracks.
- Wear gloves, avoid skin contact, and work in ventilated areas.
🏗️ Applications Across Industries
- RCC tanks and reservoirs
- Concrete slabs and industrial floors
- Columns, beams, and structural walls
- Parking decks, podiums, basements
- Tunnels, underpasses, bridges
📦 Packaging & Supply
Each Mr. JO Inject product is available in site-friendly pack sizes designed for easy mixing, transport, and use on scaffolds or tight work areas. Refer individual product pages for pack formats.
🔚 The MR. JO Advantage
The MR. JO Inject range brings together precision, reliability, and performance — backed by our expertise in structural epoxy formulations. Whether it’s a damp site, a fine hairline crack, or a wide structural gap, there’s a MR. JO injection grout tailored to your repair need.
For guidance or custom application needs, connect with our technical team or request a demo kit.
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