Coljoint N2 is suitable for joints between concrete and bituminous surfacing preventing entry of water and other materials. It has excellent recovery properties and low temperature flexibility.
Coljoint N2 is not recommended for overbanding due to its lack of skid resistance. Jointgrip OB is recommended for overbanding due to its superior skid resistance properties.
- Carriageways
- Runways
- Motorways
- Footways
Damaged joints must be repaired using an epoxy mortar approved by Colas. If necessary joints should also be treated by grit blasting. Joints and cracks should always be thoroughly cleaned and dried with a hot compressed air lance in order to remove all moisture and dirt. This process should be carried out immediately prior to the application of Coljoint N2.
Concrete joints should be primed with CP Primer before applying Coljoint N2.
Coljoint N2 should be heated indirectly and agitated in a purpose-built sealant preheater unit with thermostatic control. Ensuring that the temperature does not exceed 195°C. The heater unit should be air-jacketed or oil-jacketed. The materials should then be pumped in to the joint, or poured at temperatures between 175–190°C using a melter pourer or bucket with a 'V' lip, with the minimum loss of temperature. Joints should be sealed to a level of at least 3mm below the surface.
Application Properties
| Pouring temperature | 170°C - 190°C |
| Safe heating temperature | 185°C for 6 hours maximum. 190°C maximum temperature |
| Depth of joint (mm) | Weight of Coljoint N2 Sealant to fill 100m joint (kg) |
| 15 | 20 | 25 | 30 | 35 | 40 |
| 20 | 30 | 40 | 50 | 60 | 70 | 80 |
| 25 | - | - | 62.5 | 75 | 87.5 | 100 |
| 30 | - | - | - | - | 105 | 120 |
| 35 | - | - | - | - | 122.5 | 140 |
| 40 | - | - | - | - | - | 160 |
Coljoint N2 is available in plastic lined papersacks holding 15kg (nominal). Remove the paper leaving plastic liner and load into heating equipment.
Keep in dry store under cover.
Coljoint N2 complies with the specification given in BS 2499: Part 1 1993 Hot-applied joint sealant systems for concrete pavements - Part 1. Specifications for Joint Sealants; Type N2 Sealant.
| Test Name | Specification |
| Cone Penetration (25°C, 150g) | 4 to 10mm |
| Flow (60°C, plate) | <10mm |
| Extension Test (3 cycles at -20°C at 6mm/hour for 3 hours) | <50mm2 debounding <20mm2 rupture, with less than 3mm depth Force between 160-160ON |
| Resilience (25°C) | 40% minimum recovery |
| Determination of bitumen compatibility | No adhesion failure, no oily exhudate |
| Softening Point | ≥85°C |
| Density at 25°C (g/cm3) | 1.017 (Typical value) |
SAFETY HANDLING PRECAUTIONS (when hot)
- Wear suitable protective clothing (heat resistant gauntlet glove, overalls, protective footwear, face visor).
- DO NOT allow water to contact hot material.
- DO NOT exceed maximum safe heating temperature.
- If molten material contacts skin:
- DO NOT attempt to remove.
- Immerse affected area in cold running water for at least 10 minutes.
- Seek medical advice without delay.
This product is hazardous for transportation when carried at temperatures above 100°C.
For full safety information, please request the Coljoint N2 Safety Data Sheet 06 using the contact information at the back of this brochure.
