Product Data Sheet Show all documents

SikaTard® Pak

Powdered Concrete Retarder and Truck Mixerwash Admixture

SikaTard® Pak is a powdered admixture formulated to control the hydration of cement. The SikaTard® Pak has been specifically formulated to enable the reduction of waste associated with the washing out of truck mixes. SikaTard® Pak is packaged in water soluble bags to enable ease of addition and handling.

SikaTard® Pak as a mixerwash admixture: -
  • Reduced waste and associated cost
  • Reduced wash water consumption
  • Reduced build up in mixer
SikaTard® Pak as stabiliser/retarder of fresh concrete (subject to local evaluation)
  • Extended workability time
  • Reduced wash water consumption
  • Reduced build up in mixer
Product Data Sheet Show all documents

Usage

  • Retardation of fresh concrete
  • Ready–mix truck wash out
 

Advantages

SikaTard® Pak as a mixerwash admixture: -
  • Reduced waste and associated cost
  • Reduced wash water consumption
  • Reduced build up in mixer
SikaTard® Pak as stabiliser/retarder of fresh concrete (subject to local evaluation)
  • Extended workability time
  • Reduced wash water consumption
  • Reduced build up in mixer

Packaging

75 x 0.2 kg water soluble bags (in re-sealable, waterproof plastic pail)

Colour

White powder

Product Details

Product Information

Chemical Base

Carboxylic and phosphonic blend

Shelf Life

12 months from date of production if stored properly in undamaged containers.

Storage Conditions

Store in dry conditions at temperatures between +5°C and +25°C. Protect from direct sunlight and frost.

Bulk Density

0.9 kg/L

Total Chloride Ion Content

<0.10% w/w (chloride free)

Equivalent Sodium Oxide

<20 % w/w (alkali content)
System information

Compatibility

Sika®Admixtures: Compatibility information available on request
Cements: All cement combinations
Technical Information

Specific Advice

Effect on setting - Negligible (in concrete prepared from stabilised truck wash after 24 hours)
Effect of dosing - Increased setting times (when added to fresh concrete)

Application

Application Information

Dispensing

SikaTard® Pak should be added directly to the truck or plant mixer

DISPENSING

When used for truck washout, the mixer should be emptied of all concrete prior to commencing with the SikaTard® Pak mixerwash system.

  • Add 200 litres of fresh water to the mixer (minimum 150 Litres)
  • Add required number of SikaTard® Pak bags to the mixer
  • Add coarse aggregate to mixer (~2000 kg)
  • Turn mixer at full speed for a minimum of 2 minutes
  • Run materials up and down the mixer 2-3 times to ensure all blades are coated
  • Turn mixer at full speed for a minimum of 1 minute
  • Stop the mixer with materials at the top of the mixer and park vehicle until required

Batching of next load

  • Concrete produced/batched onto the SikaTard® Pak mix must contain a minimum of 300 kgs of CEM I per load.
  • Ensure batch weights are adjusted to account for materials already in the mixer (eg. water and aggregates).
  • Produce/batch concrete and deliver.
  • For mixer drums greater than 8.0 m3, contact should be made with Sika Technical Services.
 
Consumption

Recommended Dosage

Mixerwash:  Overnight - 1 bag per truck, Weekend - 2 bags per truck

Retarder: Typical dosage 0.5-1 bag per cubic metre

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