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BLOCKFAST AN is a chloride free accelerating admixture based on a combination of format and nitrite salts. It is supplied as a straw colored solution that instantly disperses in water. BLOCKFAST AN accelerates the early stages of cement hydration, producing a more rapid stiffening and allowing strength gain to commence at an earlier stage. This effect is particularly noticeable at low temperatures and is most significant in the first 24 hours after mixing.

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Category: Concrete Admixure


  • To accelerate the stiffening and early strength gain of Portland cement concrete and mortar  
  • In applications that  include concrete or mortar placed in cold weather and precast concrete  
  • All types of low and high rise buildings  

  • Particularly effective in assisting to offset the delaying effect of low temperatures on setting and strength gain  
  • Accelerated setting gives added protection against early age frost attack  It provides a degree of water reduction or increased workability  
  • Suitable for use in bricklaying mortar  
  • Chloride free, safe for use in RCC   

Compliance standard:  
BS 5075 Part 1  
ASTM C494-Type C  

Method of application:
BLOCKFAST AN dosage ratio depends on mix design and site specification requirements, recommended dosage as a guideline 0.6 to 1.5 % volume by weight of cement.  

Appearance Straw coloured free flowing thin liquid
Sp. Gravity 1.25 to 1.30 @200C
PH value 7 to 8
Chloride content Nil
Air entrained Typically less than 1% additional air at normal dosages
Alkali content Typically less than 155 g Na2O equivalent per liter of admixture

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