SpECgrout C3


SpECgrout C3 is supplied in 25kg sealed
polyethylene bags and only requires the addition of
the specified amount of clean water to produce a fluid
grout for pouring or pumping into large voids under
machine base plates or between structural units.

SpECgrout C3 consists of Portland cement, selected
graded silica aggregates and additives. The low
water/powder ratio ensures a grout of high
compressive strength and excellent flow characteristics.

Technical Details

SpECgrout C3 is recommended for grouting gaps where the thickness is not less than 75mm and not greater than 500mm.

In general, pre-bagged cementitious grouts without aggregate are only suitable for gaps up to 100mm. Grouting larger gaps normally requires the addition of larger aggregate to reduce the exotherm produced during the hydration process and the consequent risk of thermal cracking.

SpECgrout C3 contains aggregate that reduces excessive heat build up making the product especially suitable for deep voids under machine base plates, voids around and beneath ground tanks and large bolt pockets
· Unique non-metallic shrinkage compensation system providing maximum contact between baseplate and hardened grout.
· Extremely high flow characteristics with excellent retention of flow.
· Suitable for placing by pump.
· Extremely low permeability.
· High compressive strength at early stages allowing minimal downtime on machinery
· No requirement for site addition of aggregate.

Typical test data Compressive strength (BS EN 12390-3) 

3 Days 

45±5 N/mm² 

7 Days 

55±5 N/mm² 
28 Days 

70±5 N/mm² 

Setting time (BS EN 196-3) 

Initial set 

2 hours @ 25°C 

Final set 

2.5 hours @ 25°C 

The substrate must be clean and completely free from contaminants including greases, oil and loose material.

To avoid absorption and reduction in flow characteristics, it is essential that the prepared substrate is soaked with clean water for a few hours prior to grouting. Prior to placing the grout any water remaining on the surface should be removed by blowing clean with oil free compressed air.

The underside of the base plate to be grouted should be clean and any oil or grease MUST be removed. The underside should preferably have no geometry, which would impede the flow of grout. Should cruciforms be present, it is essential that air release holes are drilled through the base plate to avoid trapping air hence reducing the total contact area.

All formwork should be sealed to prevent loss of grout during pouring. The formwork should be tight to the base plate and parallel to the direction of flow. A gap of around 100mm is required at the pouring hopper with a gap of around 50mm at the opposite end.

Cross Section of typical grouting formwork

SpECgrout C3 is a one-part cementitious grout.

SpECgrout C3 must be mixed using a slow speed electric drill fitted with a suitable mixing paddle (SpEC Technical Department can advise). This method is suitable for small quantities and for larger quantities it may be necessary to consider the use of a grout pump. Please contact SpEC Technical Department for more advice on the type of pumps available.

Good planning is essential to ensure a continuous flow of grout once pouring commences.

The specified water quantity should be measured in an accurately graduated vessel and added to the mixer. The bagged powder is then added slowly whilst mixing. A mixing time of not less than five minutes is required to ensure adequate dispersal of the ingredients.

The recommended water used per 25kg bag is 3.0 to 3.3 litres.

The product cannot be mixed by hand

The grout should be poured immediately after mixing and certainly not more than 20 minutes after mixing is complete to take full advantage of the high flow properties.

Again, planning is imperative to ensure that sufficient grout is available to allow continuity of placing. The mixed product should always be poured from the hopper end of the formwork. On no account should grout be poured from more than one side of the base plate. Maintenance of a fluid head is essential to avoid air entrapment.

Once the grouting has been completed, all exposed areas of grout should be cured immediately using SpECcure AC curing membrane.
SpECgrout C3 is supplied in 25kg bags. Each bag when mixed with water will provide approximately 12.5 litres of mixed material.
Contact us for more info.

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