Product Data Sheet Show all documents

WCA-200

SODIUM SILICATE LIQUID SHOTCRETE ACCELERATOR

WCA-200 is a non-chloride, liquid set accelerating admixture for wet-mix shotcrete applications.

WCA-200 is suitable for use in steel reinforced shotcrete and substrates. WCA-200 provides the following benefits:   
  • High early strength development,
  • Reliable long-term strength and durability,
  • Easier overhead spraying by improved adhesion of shotcrete to substrate,
  • Distinct reduction of rebound and dust,
  • Improved bond of shotcrete to the substrate.
Product Data Sheet Show all documents

Usage

WCA-200 can be used to accelerate setting of wet-mix shotcrete for applications including but not limited to:   
  • General construction work,
  • Repair and rehabilitation of concrete structures,
  • Excavation stabilization of face and within tunnel and mine construction,
  • Rock, slope, and trench stabilization,
  • High quality lining shotcrete.
 

Advantages

WCA-200 is suitable for use in steel reinforced shotcrete and substrates. WCA-200 provides the following benefits:   
  • High early strength development,
  • Reliable long-term strength and durability,
  • Easier overhead spraying by improved adhesion of shotcrete to substrate,
  • Distinct reduction of rebound and dust,
  • Improved bond of shotcrete to the substrate.

Packaging

Available in 275-gallon (1040-liter) totes and bulk delivery.

Product Details

Product Information

Chemical Base

Silicate Base

Shelf Life

Shelf life when stored in original packaging in dry warehouse conditions between 41°F and 104°F (5-40°C) is one year from the date of manufacture.

Storage Conditions

WCA-200 should be stored above 41°F (5°C). If frozen, thaw and agitate thoroughly to return to a normal state. Protect from direct sunlight.

Density

Approx. 1.410

 

Application

Consumption

Recommended Dosage

The typical dosage rate of WCA-200 when Ordinary Portland Cement (OPC) is greater than 65% will vary between 4-9% by weight of cementitious/binding material.

  

Trial mixes with the actual materials should be conducted to determine the required dosage for optimum performance. The required dosage for a mix design may change with fluctuations in the ambient temperature.

  

To the extent specialized materials are used, extreme ambient temperatures are encountered, or for other unusual project conditions, dosage rates outside the typical range may be required. For dosage rates outside the typical range, contact your Sika STM Technical Representative.
Application steps

APPLICATION INSTRUCTIONS

WCA-200 is dosed and added on-site by a liquid dispensing system. Optimum dispersion in the shotcrete is governed by nozzle configuration and shotcreting techniques.

  

The accelerator’s effect depends on the content, age and type of cement, as well as on the shotcrete temperature. Furthermore, the shotcrete quality is widely affected by the substrate, the applied layer thickness, the spraying process, the quality of equipment and the application technique. The w/c ratio of the basic concrete mix in the wet-mix shotcrete application directly influences the acceleration effect of WCA-200. Prelimimary trials are required to determine correct dosage for project requirements. 

  

Please contact your Sika STM Technical Representative for any additional technical support required.

 

EQUIPMENT

All equipment in contact with WCA-200 must be cleaned thoroughly before use. All prelimiary trials must be conducted with the same equipment as intended for use of project.

  

Please contact your Sika STM Technical Representative for any additional technical support required.

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