Tecfast Concrete is a single pre-mixed Portland cement based non-shrink concrete repair product designed with selected graded silica aggregates and additives. The mixed product may be placed in sections of 20mm up to 650mm in a single pour.
Tecfast Concrete is suitable for all concrete works where early strength development is required in order to allow early use of the placed sections. The product may be used for localised repairs plus large area placement or re-instatement of concrete pavements.
Instructions for use
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 prewetted taking care to remove any standing water before placing the Tecfast Concrete.
To achieve the most consistent concrete mix, mechanical mixing using a forced action mixer such as the Creteangle is recommended. Small mixes may be made using a heavy duty slow speed high torque drill and Mortar Stirrer. Each 25kg bag of Tecfast Concrete requires 2.25 litres of water to give a medium workability concrete consistency. Excess water should not be added. Once setting of the concrete has commenced, further mixing should not be used to re-work the mix. The concrete should be placed within approximately 15 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. Part bag mixing should not be undertaken.
Mixed Tecfast Concrete should be placed onto the dampened prepared surface as soon as mixing is complete. Once placed fully compact the concrete to obtain maximum strength development. The bed thickness applied in a single application should be between 20mm to 650mm. The placed concrete will have hardened sufficiently to carry out further work within some 20 minutes depending on the surrounding ambient conditions.
No special curing is required at temperatures between 5°C and 35°C. For placing at temperatures outside this range contact the Technical Service Department. At early ages do not allow placed concrete to rapidly dry and protect from rain and frost.