HYDRO HC- K20 system and

Accelerator technology

This system is a directly related development

to ‘the core’, and is based around the rapid formation of ettringite, without damaging the long term physical performance of the shotcrete. To achieve this effectively there are three necessary requirements:

 

•A pH of around 9-11

•A seed site

•A block on Portland cement hydration

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Normal alkali-free accelerators are low pH and attempt to increase the aluminum content of a Portland cement. These current typical systems were formulated in the belief that the formation of ettringite will generate heat, and allow a reduction in water content; hence increasing the effectiveness of the concrete mix.

Special Properties K20:

Strength enhancer - Early age :over 450% of control up to one day and extremely high from 4 to 8 hourLate age : over 200% of control from age 2 to 90-days

Set accelerator _ 3 hours earlier initial and final set

High Range Water Reducer _ 84.2% water reduction and AS1478 strength improvement targets exceeded at all ages.

Also Drying Shrinkage Reduction should be noted -72% reduction from the control mix at 56-days