UltraCrete M45 Rapid Strength Bedding Mortar 25KG Tub

UltraCrete M45 is a rapid strength bedding and repair mortar for use with all ironwork conforming to BS EN 124 & meets HD27/04. The rapid set properties make it perfect for emergency concrete road repairs, the levelling of street ironwork, bedding of kerbs, coastal protection and tidal repair projects. This super fast setting mortar has a rapid strength gain and an excellent workable consistency. M45 conforms to and can be opened to traffic in just 45 minutes.

M45 Bedding Mortar 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. M45 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 products strength gain and alter its performance characteristics.

• For access covers, emergency concrete repairs, bedding & profiling of kerbs & tidal repair projects
• Rapid strength gain
• Open to traffic: 45 minutes
• Conforms to HD27/15
• Workability: 5 – 10 minutes
• Set Time: 15 minutes
• Depth: 10mm – 75mm
• 20N/mm² compressive strength in 45 minutes
• Shrinkage compensated
• Excellent workable consistency
• 25kg of product will require approximately 3.3 litres of water
• Add up to 30% hard stone clean aggregate to bulk out (Please note this does reduce products strength gain & characteristics) 
• Approved for use on the London Underground and Overground
• Size: 25KG Tub (also available in a 25KG bag see below)
• Storage: Store in closed original packaging at temperatures between 5°C and 30°C. Avoid Frost
• Shelf life in correct conditions for sealed packaging is 8 months (High temperatures and high humidity will lead to a reduced shelf life)

M45 Rapid Strength Bedding Mortar Preparation

Surfaces should be free from any contamination of oil, grease, paint, etc. Remove any loose particles and work on a sound substrate. Pre-soak the area with clean water prior to application to aid bond. Remove any ponded water before applying the mixed M45. 

How to Mix M45 Rapid Strength Bedding Mortar

M45 can be mixed with a forced action mixer or by hand. If hand mixing is used, ensure that it is vigorous. 25kg of product will require approximately 3.3 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.

How to Place M45 Rapid Strength Bedding Mortar

Apply the bedding material over a pre-soaked area. Once mixed, M45 should be applied to the supporting structure within 4 minutes. Firm well into position using a float and allow 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 in-filled 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 can be placed.

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