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IntroductionGeneral Info About Shotcrete
Application of Wet ShotcreteComparisonDemonstrationConclusionQuestions
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Name: zgn Can zgne
Undergraduate Student Mining Engineering atHacettepe University
E-mail: fixxtr@yahoo.com
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We excavate rock for:
Tunnels
RoadsMining
Various jobs
Problem is same: fractured, unstable rock
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Use support systems:
Rock Bolt Wire MeshSteel Arc
For completeperfectness:
Shotcrete
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Fast, easy and cost-effective
Provides support to whole area
Prevents chipping and peeling
Visually looking good
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Dry-mix Shotcrete Wet-mix Shotcrete
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1. Mixing cement and water
2. Pumping wet-mix to hose3. Providing compressed air to hose
for accelerating wet-mix
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03.01.2012 11zgn Can zgne
http://www.youtube.com/watch?v=YanHEgfepC07/31/2019 Wet Shotcrete Application
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Water/Cement Ratio
Pumping speed
Compressed Air Pressure
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Generally between 0.40 and 0.55
Lower ratio gives better strenght
Higher ratio gives better filling
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Perpendicular to application surface
Start from bottom and rise slowly
Continuously make swirling motion
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Rebound Increases
Cant fill surface well
Cant get a homogeneous concrete
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Occurs from high speed of particles
Increases with low application angle
Greater than 45 o Smaller than 45 o 03.01.2012 16zgn Can zgne
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Wire Mesh Reinforced
Fibre Reinforced
Silica Fume
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Steel Fibre Synthetic Fibre
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Wire Mesh Fibre
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Also called as Micro Silica
Additive material to cement
Increase compressive strenght to triple by
adding %13 silica fume to cement
Reduces rebound
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Much higher volume can be applied
Well mixed/blended product is served
Low dust produced
Low rebound produced
Less operating skill required
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Slightly expensive than Dry-mix
Slightly bigger equipments
Difficulty of transportation of mixed
material
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Changing rebound rate withapplication angle
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Shotcrete is a must for civil rock excavating
jobs
Shotcrete also eases all rock excavation jobs
Shotcrete type and properties should be
selected by taking job details intoconsideration
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You can ask your
questions now 03.01.2012 27zgn Can zgne