Product Data Sheet Show all documents

Parex Tecfast Concrete

R4 Strength, Rapid Setting Repair Concrete

Parex Tecfast Concrete is a cement based, one component, rapid setting, shrinkage compensated repair concrete. Parex 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.

  • Suitable for use in exposure classes: XO, XC4, XS3, XD3, XF1, XA1
  • Rapid setting
  • High early strength gain
  • 20 - 650mm application thickness
  • Good chemical resistance
  • No special curing required
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Product Data Sheet Show all documents

Usage

  • Concrete repairs to accept foot and vehicular traffic.
  • Forming of new pavement areas.
  • Re-instatement of deteriorated pavement areas.
  • Rapid repairs to roadways & runways.
  • Structural support situations.  

Advantages

  • Suitable for use in exposure classes: XO, XC4, XS3, XD3, XF1, XA1
  • Rapid setting
  • High early strength gain
  • 20 - 650mm application thickness
  • Good chemical resistance
  • No special curing required

Packaging

25 kg bags

Colour

Grey powder

Product Details

Sustainability / Certifications / Approvals

APPROVALS / STANDARDS

Parex Tecfast Concrete meets the requirements of the Highways Agency Specification for Highway Works Series 1700 for Structural Concrete.
Parex Tecfast Concrete complies with the classification R4 according to BS EN 1504-3 and is a concrete repair product for structural repair CC mortar (based on hydraulic cement).
Product Information

Chemical Base

Portland cement, selected fillers and aggregates, special additives

Shelf Life

6 months

Storage Conditions

Store properly in dry conditions in undamaged and unopened original sealed packaging

Maximum Grain Size

6.0 mm

Density

2250-2300 kg/m³

(EN 12390-7)

Soluble Chloride Ion Content

<0.003%

(EN 1015-17)

 
Technical Information

Compressive Strength

2 hours

20 N/mm2

24 hours

35 N/mm2

7 days

45 N/mm2

28 days65 N/mm2

*typical values @ 20°C using 2.25 litres of water

Modulus of Elasticity in Compression

41.2 GPa

(EN 13412)

Tensile Strength

2.4 N/mm2

(EN 1542)

Reaction to Fire

Euroclass A1

Application

Application Information

Mixing Ratio

2.25 litres of water for 25 kg powder

Layer Thickness

20mm min. / 650mm max.

Ambient Air Temperature

+5°C min. / +35°C max.

Substrate Temperature

+5°C min. / +35°C max.

Pot Life

10 mins* from start of mixing

*@ 20°C. At other temperatures potlife may differ

Setting time

20 mins

Initial set time

15 mins
Consumption

Yield

25 kg yields 11.5 litres.
Application steps

MIXING

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.
Measure the appropriate amount of water and place in to a clean mixing vessel. Excess water should not be added. Slowly add complete bag of Parex Tecfast Concrete into the water and continuously mix to achieve a uniform and lump free consistency.

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.

Once setting of the concrete has commenced, further mixing should not be used to re-work the mix.
 

APPLICATION

Mixed Parex 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.

CURING TREATMENT

No special curing is required at temperatures between 5°C and 35°C. 
At early ages do not allow placed concrete to rapidly dry and protect from rain and frost.

CLEANING OF TOOLS

Clean all tools and application equipment with water immediately after use. Hardened/cured material can only be mechanically removed.

 

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