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• Features & Benefits
• Preparation & Mixing
• Placing

Features & Benefits

• Uses include:
  • Re-bedding of raised manhole frames
  • Bedding of frames in new roads
  • Support of road furniture
• Only needs to be mixed with water on site
• Rapid setting assists the re-bedding of manhole frames and the setting of new frame systems
• Chloride free and can be safely used with cast iron and steel units.
• Can be placed in sections of 15mm to 75mm in thickness. Greater thicknesses can be built up in layers
• Alternatively, thicker beds may be formed by the addition of up to 30% of the Highway C2 weight of clean dry pea shingle. No additional mixing water is required. After placement, no special curing is required in moderate ambient conditions
• Highway C2 has been tested in accordance with appropriate parts of EN12390
• The product conforms to DTp: HD 27/04. Design Manual for Roads and Bridges V7 Sec2 3.11
• Mortars for bedding ironwork such as manhole cover frames during repairs may be trafficked when the strength is expected to be 20N/mm². For rapid construction, this strength should be achieved within 2 hours. Highway C2 will achieve the required strength of 20N/mm2 within 2 hour at a temperature of 20°C

Preparation & Mixing

• Laitance and all loose material including dust, oil and grease should be removed in order to produce a sound substrate
• The work area should be pre-wetted taking care to remove any standing water before placing the Highway C2 mortar
• To achieve the most consistent mortar mix, mechanical mixing is recommended
• Thorough hand mixing is suitable but care should be taken to ensure that the mix is fully wetted out
• Mechanical mixing may be carried out in a suitable vessel using a slow speed high torque drill and Mortar Stirrer
• Hand mixing may be carried out using a clean spot board or wheelbarrow
• Each 25kg bag of Highway C2 requires 2.5 to 3.0 litres of water to give a mortar consistency
• Excess water should not be added
• Once setting of the mortar has commenced, further mixing should not be used to re-work the mix
• The mortar should be placed within approximately 10 minutes of mixing
• The working time may be extended in cold ambient conditions and may be slightly shortened in hot ambient conditions
• For cold weather working, warm mixing water at up to 30°C may be used
• Each 25kg bag of Highway C2 will enable a manhole frame 600mm x 600mm to be raised approximately 25mm
• The volume yield of each 25kg bag of Highway C2 is approximately 12.75 litres

Placing

• Set suitable levelling shims onto the working surface ready to receive the frame or unit
• Place the mixed mortar onto the prepared surface and lower the frame or unit onto the mortar and knock down onto the pre-set shims to line and level
• The bed thickness applied in a single application should be between 15mm to 75mm
• Thicker support beds can be achieved by applying further material as soon as the lower bed has hardened sufficiently not to distort under the additional work
• The placed mortar will have hardened sufficiently to carry out further work, such as haunching, within some 20 minutes depending on the surrounding ambient conditions
• No special curing is required at temperatures between 5°C and 35°C