TamCem HCA

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TamCem HCA is a liquid additive for all fresh concrete and grout mixes where extended “open-time” becomes a crucial requirement for the construction process time frame.  The product is designed to efficiently control cement hydration to allow for extended waiting times or delays on site, or readymix concrete transportation times. TamCem HCA eliminates the amount of rejected concrete due to loss of workability and helps contractors to stay within or even reduce the initially calculated material budget.

TamCem HCA is a high performance hydration control admixture for all wet sprayed concrete. It can be used in tunnelling applications where low rebound and high performance in combination with TamShot alkali-free accelerator is needed.

By adjusting the dosage, setting times of fresh concrete can be extended, giving an open-time typically in the range of 4 to 8 hours, but can be extended up to 2 days if required.

TamCem HCA meets EN 934-2 requirements for set retarding admixtures, EN 934-5 requirements for consistence control admixtures and ASTM C-494 requirements for Type B, retarding and Type D, water reducing and retarding admixtures.

Key Benefits
  • Controlled extended life of concrete or grout mix allowing increased flexibility on site
  • Allows city centre job sites to stockpile fresh concrete and grout mixes during day shifts to negate need for night time batching
  • Significantly reduces disposal of rejected / returned mixes
  • Enhances performance of sprayed concrete set accelerators
  • Beneficial in high temperatures and high humidity application environments

 

 

Typical Applications

TamCem HCA reacts with all commonly used Portland cement types and can be used to control hydration of all cement based grouts or concrete types. Typically, TamCem HCA is used in the mining and underground construction industry for applications such as:

  • Sprayed concrete
  • TBM Backfill grouts
  • Pre-excavation grouting using TamCrete MFC grouts
  • All concrete and cement grout applications where extended mix life is required