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• Features & Benefits
• Preparation
• Mixing
• Placing

Features & Benefits

• Uses:
  • 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
• Chloride free and can be safely used with cast iron and steel units
• Can be placed in sections of 15mm to 75mm
• Greater thicknesses can be built up in layers
• Alternatively thicker beds may be formed by the addition of up to 30% of the Highway CA1 weight of clean dry pea shingle
• No additional mixing water is required
• After placement no special curing is required in moderate ambient conditions
• Highway CA1 has been tested in accordance with appropriate parts of EN 12390
• The product conforms to DTp: HD 27/15. 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 CA1 will achieve the required strength of 20N/mm² within 45 minutes at a temperature of 20°C

Preparation

• 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 mortar

Mixing

• 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 without the use of excess water
• Mechanical mixing may be carried out in a suitable vessel using a slow speed high torque drill and paddle
• Hand mixing may be carried out using a clean spot board or wheelbarrow
• 25kg of Highway CA1 requires 2.5 to 3.0 litres of water to give a stiff mortar
• Excess water should not be added
• Once setting 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
• Variations in water content for particular applications may alter mortar consistency and compressive strength achieved
• Each 25kg bag of Highway CA1 will enable a manhole frame 600 x 600mm to be raised approximately 25mm
• The volume yield of each 25kg bag of Highway CA1 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 and 35°C
• Protect freshly laid material from strong direct sunlight, rain, frost or snow
• Clean all mixing equipment and tools before setting commences