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What is the difference between dry-mix method and wet-mix method in shotcrete?

What is the difference between dry-mix method and wet-mix method in shotcrete?

Shotcrete is not a special product of concrete and it is not a special method of placing concrete. In dry-mix method the dry cementitious mixture is blown through a hose to the nozzle, where the water is injected immediately. The dry-mix method appears to be better for low volume placements. The nozzleman should pay great attention in adding the necessary amount of water during shooting operation.

Wet-mix method involves the pumping of ready mixed concrete to the nozzle. Compressed air is introduced at the nozzle to impel the mixture onto the receiving surface. The wet-mix method is more favorable for large volume placements. Rebound is less than in the dry-mix method. The nozzleman does not need to be concerned with the control on water addition.

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This question is taken from book named – A Closer Look at Prevailing Civil Engineering Practice – What, Why and How by Vincent T. H. CHU.

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Kanwarjot Singh

Kanwarjot Singh is the founder of Civil Engineering Portal, a leading civil engineering website which has been awarded as the best online publication by CIDC. He did his BE civil from Thapar University, Patiala and has been working on this website with his team of Civil Engineers.

3 comments on "What is the difference between dry-mix method and wet-mix method in shotcrete?"

Jitesh powankar says:

Dry process it is the low cost method and in india available raw material is more

venkateshwarlu says:

wetmix method data required

nick munyeti says:

is there a need for accelerator in dry shotcrete
?

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