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OF TECHNOLOGYDEPARTMENT OF CIVIL

ENGINEERING

UNDER THE GUIDEANCEOF

B S KARTHIK 

Asst.professor

PRESENTED BY

AGNESH B S1BI11CV008

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Topics coveredTopics coveredIntrodction

Concrete speci!c"tionL"#in$ tec%ni&es

Rep"ir 'or(s

Conc)sion

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  IntrodctionIntrodction

 There are often st!atons s!"h as

#ase$ents % se&era'e %(!"ts % har#o!rs % #r('esan( $arne &or)s %n &h"h "on"rete s to #e p*a"e(!n(er&ater.

  Spe"a* pre"a!ton nee( to #e ta)en &hene+er

the "on"rete s to #e p*a"e( !n(er&ater.

 The "on"rete sho!*( #e p*ast" an( "ohes+e#!t sho!*( ha+e 'oo( ,o&a#*t-.

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  Performance requirements for UWC

Workability & self compactionCohesion against washout & segregation

Low heat of hydration

Controlled set time

Compressive strengthAdequate bond

  Problems facedegregation of fine aggregates from coarse aggregates

Water pollution

!ncreased w"c ratio

washout

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T#pes o* M"teri")sT#pes o* M"teri")s

sedsed ++Ce$ent

 Coarse A''re'ates

 Fne A''re'ates

 A($t!res

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  CE/ENT 0CE/ENT 0  T-pes of "e$ents !se( n UNDERWATERCONCRETING :

Or(nar- Port*an( Ce$ent 1OPC2

S!*phate Resstn' 3Port*an( Ce$ent 1 SRPC 2

Lo& Heat 3 Port*an( Ce$ent 1 LHPC 2

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  AGGREGATESAGGREGATES 0Coarse Aggregates :

  The "oarse a''re'ate for ntr!(e( n"on"rete sha** "onfor$ to the fo**o&n''ra(aton0

/a$!$ S4e 3 5.637 n"h 15889 sha**pass a :6 $$ se+e 2

/n$!$ S4e 3 $atera* passn' a 5;$$ se+e sha** not e"ee( 69 #- $ass of

the "oarse a''re'ate.

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Fine Aggregates :   The san( for the ntr!(e( 'ro!t sha** #e

&e** 'ra(e(% prefera#*- of ro!n( 'ransan( sha** "onfor$ to the fo**o&n'

'ra(aton0  Passn' 5.5< $$ se+e ;6 3 5889

  Passn' =88 !$ se+e =8 3 89

  Passn' :6 !$ se+e 8 3 589

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Use of D@erentUse of D@erent

A($t!resA($t!res Anti-washout admixtures

Hydrocem

 Mellose

is!osit" modi#ed admixtures

Naphtha*ene For$a*(eh-(e

S!*fonate( /e*a$ne For$a*(eh-(e

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Concrete Particles with adding MELLOSE

Concrete Particles without MELLOSE

* Black Dots 

Indicates Water 

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Concrete )"#in$Concrete )"#in$

tec%ni&estec%ni&es

Tremie method

$u!%et &'a!ing

&um( method

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#$%!% %#'()

A Tre$e s a &atert'ht ppe

Genera**- 768$$ n (a.F!nne* shape( hopper at ts!pper en( an( a *oose p*!' at the

#otto$.It s s!pporte( on a &or)n'p*atfor$ a#o+e &ater *e+e*.

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pecifications of concrete tobe used in #remie method*

Coarse A''re'ate0 Gra+e* of >? 178$$2 $a.s4e. Use 68366 9 of the tota* a''re'ate #-&e'ht.San(% ?63689 of the tota* a''re'ate #- &e'ht

aterCe$ent Rato0 8.?7 18.?6 /a$!$2.ater3Re(!"n' A($t!re 1prefera#*- t s a*sop*ast"4er20 Do not !se s!per p*ast"4ers.Ar3Entran$ent A($t!res0 To '+e =9 tota*

ar.Retar(n' A($t!re0 To n"rease settn' t$eto ?37? ho!rs% as re!re(.S*!$p0 = 57 5

 Ths $ &** (e+e*op "o$press+e stren'th n

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Laying of concrete by using #remie14

+asic principle behind ethod

of underwater concreting ,

#remie method

 

ethod of underwater

concreting- #remie

method .inside view/

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  D+ers Usn' Tre$eCon"retn'

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Bc(et p)"cin$Bc(et p)"cin$

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PUP %#'()*

P!$pn' "on"rete

(re"t*- nto ts na*

poston% n+o*+n' #oth

hor4onta* an( +ert"a*

(e*+er- of "on"rete.

P!$pn' "on"rete has

the a(+anta'e of

operatona* eJ"en"-

&th potenta* sa+n's of

t$e an( *a#o!r.

17

PUMP METHOD OF

LAYI! COC"ETE

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Rep"ir 'or(sRep"ir 'or(sDenn' the Area

C*eann' the A@e"te( AreaE!p$ent Ha!*a'e

Personne* re!re$ents

Inspe"ton $etho(s

En+ron$ent "ons(eratons

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At present% the Tre$e p*a"e$ent

$etho( s the stan(ar( &a- ofp*a"n' h'h3!a*t- "on"rete!n(er&ater. The other p*a"e$ent

$etho( are not a#*e to re*a#*- p*a"eh'h3!a*t- !n(er&ater "on"rete for$aor str!"t!res% a*tho!'h the- $a-n( app*"aton n spe"a* "ases.

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Re*erencesRe*erences00

&&&."e.#er#*e-.e(!par$ont5=6tre$e

&&&.+!*"anha$$er.net

&&&."e.'ate"h.e(!));7"*asspress!&atern(e.ht$

&&&.s"ane"$."o$.a!pro(!"tsa((t+esh-(ro"e$n(e.ht$

&&&."e.e"n.p!r(!e.e(!"e$"*pro"+*$e**ose.ht$

&&&.$aster#!*(er."o$!".ht$

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