Nitoseal SC820 is a very low modulus, self-smoothing, one-part, gun applied, silicone joint sealant designed to effectively seal joints in concrete and asphalt roads, runways, carparks and pavements. The extra low modulus characteristics of Nitoseal SC820 allow it to accommodate large cyclic joint movements of plus 100% and minus 50% in both concrete and asphalt pavements, while not generating high tensile stresses in weak asphalt substrates. Nitoseal SC820 may be applied to the joints using a suitable sealant gun, and self-smooths after application thereby eliminating the need for tooling. This property makes Nitoseal SC820 ideal as a slot sealant to encapsulate electrical signal and sensor cables which may be laid in sawn pavement joints.

Uses

Sealing sawn joints in:

• Asphalt roads & pavements
• Slot sealing of cable installations in asphalt and concrete pavements
• Abutment joints between concrete and asphalt pavements

Advantages

• Ready to use
• No mixing required
• Fast rate of cure
• Excellent adhesion to clean dry concrete and sawn asphalt
• Excellent weathering – UV and ozone resistant
• Dispensed from a bulk container by hand or air powered pump
• Large joint movement accommodation

Design Criteria

Nitoseal SC820 is designed for use in sawn joints in both concrete and asphalt pavements. All moving joints must be designed so that the maximum movement capability of the sealant is not exceeded. In joints between concrete or asphalt pavements the minimum depth of the sealant bead must not be less than 7mm. In all joints either a polyethylene bond breaker tape or backing rod must be used to ensure that the correct width to depth profile is achieved and to prevent the sealant from adhering to the base of the joint. The sealant should be applied so that the sealant surface is recessed about 3mm below the pavement surface.