Shotcrete Work
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Transcript of Shotcrete Work
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SHOTCRETE / SCL
What and How to supervise
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What is Shotcrete?
Concrete conveyed through a hose
and pneumaticallyprojected at highvelocityonto a surface, as a construction
technique.
Shotcrete undergoes placement and compaction at
the same time
There are now two different Sprayed Concrete
Processes:
Dry Process Sprayed Concrete
Wet Process Sprayed Concrete
http://en.wikipedia.org/wiki/Pneumaticshttp://en.wikipedia.org/wiki/Velocityhttp://en.wikipedia.org/wiki/Velocityhttp://en.wikipedia.org/wiki/Pneumatics -
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Dry Spray Application Wet Spray Application
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Spray Arm With Spraying Booth
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Wet Spray Application 1
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Wet Spray Application 2
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Dry Spray Application
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Thin-flow Process for
Dry-Sprayed Concrete
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Very Early Strength
from 0 to 1 N/mm with
needle penetration
Very Early Strength
from 1 to 15 N/mm
with bolt firing Mtehod
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Core Compression Testing
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Facto rs inf luencing the reboundquant i ty:
nozzlemanstechnical skill and experience
spraying direction (up, down, horizontally) spraying parameters (air pressure, nozzle,
spray output)
spraying process (dry/wet sprayed
concrete)
sprayed concrete mix design (aggregate,
grading curve, accelerator, fibers, binder)
sprayed concrete performance (very earlystrength, adhesive strength, layer thickness)
substrate condition (evenness, adhesion)
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Handling the Spray Nozzle for
an even Shotcrete Surface
The influence of the Spray
angle on the rebound
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The main mix requirement focus on the
workability (Pumping, SprayingApplication) and durability; they are:
High early strength The correct set Concrete characteristics
User-friendly workability (long open times)
Good pumpability (dense-flow delivery) Good sprayability (pliability)
Minimum rebound
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Driving Sprayed Concrete Laboratory
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Drift Wall advance
Preceding drift walls (1,2),followed by excavation ofthe crown (3) then bench
and invert (4) including safesupport in each case
Methods of Advance
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Excavation Profile Core Method Uetliberg
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Nozzle man Spraying manually Automatic Spraying head inoperation
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Sprayed Concrete Test for
Controlling Rebound
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MachinesPutzmeister Stationary Concrete
Pump Sika-PM702 E
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Putzmeister Stationary Concrete Pump
BSA 1002 D Multi
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Sika-PM500
D i U it
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Schematic cross-section
of Squeeze PumpAliva-403.5 Extended
Dosing Units
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Schematic Cross-section of
Aliva Rotor Machines
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Aliva 263 Extended
by Metering UnitAliva 246.5 Basic
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