guniting ppt
TRANSCRIPT
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VEERMATA JIJABAI TECHNOLOGICAL
INSTITUTE
CIVIL AND ENVIRONMENTAL ENGINEERINGDEPARTMENT
REHABILITATION OF STRUCTURES
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ANIKET PAWAR
(152030010)
GUNITING
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The term "gunite" refers to a dry-mix process. It was invented in 1909 by naturalist arl !eley.
It involves a mixture of #ortland cement and sand thoroughly
mixed dry$ passed through a cement gun and conveyed by air
through a flexible tube. There are two different processes in use namely %wet mix& and
%dry mix&.
'ormally fresh material with (ero slump can support itself
without sagging or pilling off. There is not much difference between guniting and shotcreting.
The dry mix process is more successful and is generally used.
INTRODUCTION
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)unite can be defined as mortar conveyed through a hose
and pneumatically pro*ected at a high velocity on to asurface.
DEFINITION
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1. ement and sand are thoroughly mixed.
+. The cement-sand mix is fed to special air pressuri(ed mechanical feeder termed as
,gun.
. The mixture is metered into the hose by a feed wheel or distributor within the gun.
/. The material is carried to the no((le by compressed air through delivery hose.
. The no((le is fitted inside with a perforated manifold through which water is sprayed
under pressure and intimately mixed with the sand-cement *et.
. The wet mortar is *etted from the no((le at high velocity onto the surface to be
gunited.
PROCESS OF DRY MI
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DRY MIX PROCESSDIAGRAM
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GUNITING MACHINE
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• It enables to have extremely strong 2 dense concrete.
• oncrete produced thus is highly resistant to
weathering 2 chemical attac.• It is also heat resistant to a high degree.
• Its resistance to abrasion is extremely high.
• 3ore homogeneous and waterproof concrete is
obtained.
PROPERTIES OF GUNITE
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It can be impacted on to any type of shape of surface including vertical oroverhead areas.
It adheres better than poured concrete to the structural steel.
It is used when formwork is cost prohibitive, impractical, where form can
be eliminated and normal casting techniques cannot be applied.
The high compressive strength is obtained. Strength of about 5 to !"
n#mm$ at $% days is generally obtained.
The repairs are carried out in any situation in a short time.
It will be placed and consolidated at the same time.
It o&ers reduced shrinkage and lower permeability.
ADVANTAGES OF GUNITING
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SR.
NO.
SHOTCRETE GUNITE
1It covers both dry and wet mix
process of shotcreting.
It is the dry mix process of
shotcreting.
2
It is a method in which fine concrete
is deposited by *etting it with high
velocity.
It is a method in which fine mortar
is deposited by *etting it with high
velocity.
3 4i(e of aggregates used is between10 to 1+ mm.
4i(e of aggregates used is below 10mm.
!5astage of material is less as
compared to guniting.
omparatively more wastage of
material is there.
54illed no((le man may or may not
be re6uired here.4illed no((le man is re6uired here.
"7oth smaller and larger thicness is
achieved.
omparatively smaller thicness is
achieved.
#5ater cement ratio is between0. to
0..5ater cement ratio is 0..
$!dmixtures are added near to the
no((le.!dmixtures are added to feeder.
%5ater cement ratio may or may not
be ad*usted.
5ater cement ratio can be ad*usted at
the time of placement.
DIFFERENCE BETWEEN SHOTCRETE ANDGUNITE
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Repair of ra!" i# $a%
APPLICATIONS OF GUNITING
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Gi'i#( for "pi))*a+
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Gi'i#( for ,re $a%a(e$ "'r&'&re
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Repair of orro$e$ pi)e" -+ (i'i#(
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Co#re'i#( of o%p)e "/ape"
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Gi'i#( for &r0e$ "&rfae"
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Gi'i#( &"e$ for a#a)1)i#i#(
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Gi'i#( &"e$ for o#re'i#( of $o%e1"/ape$ "'r&'&re" */ere for%*or!
ere'io# i" #o' po""i-)e
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Gi'i#( $o#e for "*i%%i#( poo)"
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Gi'i#( $o#e for "*i%%i#( poo)"20i$eo3
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GUNITING20i$eo3
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Gi'i#( &"e$ for '#e)1)i#i#(
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THAN41YOU