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Shotcreting

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shotcreting [′shät‚krēd·iŋ]
(engineering)
A process of conveying mortar or concrete through a hose at high velocity onto a surface; the material bonds tenaciously to a properly prepared concrete surface and to a number of other materials.

Shotcreting 

a method in concrete work in which the concrete mix is applied in layers under the pressure of compressed air.

Shotcreting is done with a special unit, which consists of a mortar gun or concrete sprayer and a compressor. A dry mix of cement and aggregate, usually sand, is prepared for shotcreting. The compressed air forces the mix through a hose to the nozzle, moistens it with water supplied through another hose, and then projects it at high velocity (130–170 m/sec) onto the surface being shotcreted. A single shotcrete layer is 10–15 mm thick and has high mechanical strength (40–70 meganewtons per sq m), density, watertightness, and cold resistance. A distinction is made between dry-mix shotcrete, which has an aggregate particle size of up to 10 mm, and wet-mix shotcrete, for which the size is up to 25 mm.

Shotcreting is used in building thin-walled reinforced-concrete structural components, such as shells, vaults, and tanks, and in producing the lining in tunnels. It is also used for hydraulic insulation, for finishing the joints of reinforced-concrete structural components, and for repair and strengthening of concrete and reinforced-concrete components and articles.

K. N. POPOV



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Shotcreting the walls has already begun, and is nearly 75 per cent complete.
The refractory castables are unique because any one of the individual products can be installed by pump casting, shotcreting, pouring or vibrating methods.
Shotcreting is done per standards established by ACI 506-R85.
 
 
 
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