What is it?
M60 rapid strength bedding mortar, for use with access covers, bonding of grantie setts, flags and bedding kerbs. M60 has been HAPAS approved since 2005, conforms to HD27/04 and has a rapid strenths gain that means it can be opened to traffic in 1 hour.
- Workability: 5 – 10 minutes
- Set time: 20 minutes
- Depth: 10mm – 75mm
- 24N/mm² compressive strength in 1hour
- Shrinkage compensated
- Approved for use on the London Underground and Overground
M60 is supplied pre-blended in 25kg bags or plastic containers and requires only the addition of water. The product can be used from 10mm-75mm in one pass, with greater depths possible using the layer-upon-layer method. M60 achieves exceptional bond strength without the use of a primer. The product can be bulked out with the addition of up to 30% hard stone clean aggregate. Please note that this will reduce the product’s strength gain and alter its performance characteristics.
All surfaces should be free from oil, grease, dust or any other visible contaminants. Remove all loose particles and work on a sound substrate. Pre-soak the area with clean water prior to application to aid bond. Remove ponded water before applying the product.
M60 can be mixed with a forced action mixer or by hand with an appropriate tool. If hand mixing is used, ensure that it is vigorous. 25kg of product will require approximately 3 litres of water. A stiff consistent mix with no slump should be achieved, ensuring all particles are well wetted. Note: Mix only enough material to apply within 4 minutes. Never remix or add extra water.
Apply the bedding material over a pre-soaked area. Once mixed, M60 should be applied to the supporting structure within 4 minutes. Firm well into position using a float and allowing a 5mm excess thickness. Place the frame onto the bedding mortar ensuring it is fully supported. Check that the frame does not overhang the mortar at any point (use suitable lifting equipment when positioning the frame). Care must be taken to prevent voids in the bedding material under the frame, especially in the cover seating area. The frame should then be tamped into place ensuring the correct level is obtained. Any holes within the frame should be infilled and the flanges of the frame enveloped by a minimum thickness of 10mm of the bedding material. Exposed surfaces of the bedding material should be float finished, ensuring voids are filled. Remove loose materials and point the inside surface to a smooth finish. Once the bedding material has reached its initial set, the backfill material QC10 or similar concrete can be placed.
M60 should be removed from tools and equipment with clean water immediately after use. Cured material can also be removed mechanically.
Store in closed original packaging at temperatures between 5°C and 30°C. Avoid frost. Shelf life in correct conditions for sealed packaging is 6 months. High temperatures and high humidity will lead to a reduced shelf life.
Health, Safety and Environmental
Please ensure that appropriate PPE is used when preparing, mixing and applying products. Always wash your hands before consuming food and make sure that materials are kept safely out of reach of children and animals. Please dispose of packaging and waste responsibly and in accordance with local authority requirements.