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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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http://www.youtube.com/watch?v=YanHEgfepC0

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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