How does CLEVA-Crete reduce pressure in lines and at the orifice of the nozzle?

CLEVA-Crete dynamically produces calcium silicate hydrate gel that acts somewhat like a lubricant and causes the finer aggregate in shotcrete to rollover and flow-through pipe systems much better. In CCMC (Cleva Crete Modified Concrete), it typically reduces line pressures and pressure at the nozzle by at least 35%.

Do I still need silica fume if using CCMC?

CLEVA-Crete completely replaces silica fume. It has the same blaine of <>20,000 square metres per kg and yet produces a finer resultant gel that flows smoother, hangs up better and cracks significantly less than silica fume.

What do I do to get CLEVA-Crete specified into all future work?

Our CLEVA-Crete Technical Advisor is always ready to approach the specifying body looking after any of your future projects. Please call and register your interest and we will assist you in every way we can.

If CLEVA-Crete reduces line pressure by 35% does this also affect rebound volume loss and cold jointing from rebound material?

Yes, it reduces rebound by 35% so in something as small as an 8m x 4m swimming pool with an average depth of 1.4 metres, you can reduce rebound material loss by up to 50%. Also, if the mix has steel fibre in it, it reduces rebound, makes the mix stickier and so dramatically improves workers safety near the nozzle.

How is CCMC different to crystal growth technology?

All CCMC behaves very differently. CLEVA-Crete makes the mix set up nice and sticky as if you have silica fume in the mix, and retains moisture so it will issue the finished concrete to have minimal if any cracking and your finishers will notice an extra finishing cream from the gel, that enables a superior smooth aesthetic finish. All of this will be achieved in record time and without putting pressure on your cutters and finishers.

Where shotcrete is being carried out in direct sunlight on a very hot day, your cutters and finishers will spend less time standing around waiting for the concrete to go off. They will be able to begin their work earlier than normal, soon after the nozzle operator has sprayed each section rather than waiting around for it to set.

Do you have any further questions? If so, please contact us at

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