Concrete Class 06b Water

7/24/2019 Concrete Class 06b Water

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CONCRETE

TECHNOLOGYIng. Cristian Sotomayor

Ing. Andrs Sotil Chvez

Class 06b

Mixing Water


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Water that is safe to

drink is safe to use in


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WAT!

Ty"i#ally "resent in #on#rete bet$een %&' to(&' by vol)me

Water has ma*or roles +or #on#rete $or,ability

and hydration "ro#ess.

$-# ratio may be the most #riti#al +a#tor in the"rod)#tion o+ good )ality #on#rete.

Too m)#h $ater red)#es #on#rete strengthToo little $ater ma,es the #on#rete )n$or,able


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WAT! /1CTI21S

%3 !ea#t $ith #ement "o$der4 th)s "rod)#inghydration "rod)#ts

(3 A#t as a l)bri#ant4 #ontrib)ting to the$or,ability o+ the +resh mixt)re

53 Se#)re the ne#essary s"a#e in the "aste +or

the develo"ment o+ hydration "rod)#ts


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MII17 WAT!

I+ +resh $ater isn8t available4 $e may allo$ someim")rities i+ $e still obtain a reasonable #on#retemix

xam"le9 sea$ater may be )sed +or "lain

#on#rete4 b)t not +or rein+or#ed

A##e"table Criteria :ASTM C;day #om"ressive strength o+ mortar#)bes ;0' o+ strength o+ those made $ith+resh $ater

Sho)ld not a@e#t the set time signi#antly


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WAT! ISSS

x#essive im")rities in mixing $ater not onlymay a@e#t setting time and #on#rete strength4b)t also may #a)se9Bores#en#e

StainingCorrosion o+ rein+or#ementol)me instability!ed)#ed d)rability

Any "otable :drin,able3 $ater #an be )sed $iththe ex#e"tion o+Mineral $atersWater #ontaining s)gar


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Ty"i#al Water Analyses4 ""m

Chemicals City water SeawaterSilica (SiO2) 0 to 25

Iron (Fe) 0 to 0.2

Calcium (Ca) 1 to 100 50 to 480

Magnesium (Mg) 0 to 0 2!0 to 1410So"ium (#a) 1 to 225 21$0 to 12%200

&otassium (') 0 to 20 0 to 550

icar*onate (+CO) 4 to 550

Sul,ate (SO4

) 2 to 125 580 to 2810

C-lori"e (Cl) 1 to 00 $!0 to 20%000

#itrate (#O) 0 to 2

otal "issol/e" soli"s 20 to 1000 5%000


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Atomi# Absor"tion S"e#tro"hotomete


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A##e"tan#e Criteria +orD)estionable Water S)""lies

Limits Test method

Comressi/e strengt-%minimum ercentage o,

control at "as$0

SM C 10$ orS+O 10!

ime o, set% "e/iation ,romcontrol% -r3min.

,rom 1300 earlier to130 later

SM C 1$1 orS+O 11

ASTM C 94 or AASHTO M 157


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Chemi#al Eimits +or Mixing Water

Chemical or type of construction

Concentration,

Max. ppm Test method

C-lori"e% as Cl SM 512

&restresse" concrete or concrete in*ri"ge "ecs

500

Ot-er rein,orce" concrete containingaluminum or "issimilar metals orgal/ani6e" metal ,orms

1%000

Sul,ate% as SO4 %000 SM 51!

lalies% as (#a2O 7 0.!58 '2O) !00

otal soli"s 50%000 S+O 2!

ASTM C 94 or AASHTO M 157


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ACI 5%F Eimits +or Chloride Ion

Content in Con#reteGrestressed #on#rete 0.06'

!ein+or#ed #on#rete ex"osed

to #hloride in servi#e 0.%&'!ein+or#ed #on#rete that $ill

be dry or "rote#ted +rom

moist)re in servi#e %.00'

2ther rein+or#ed #on#rete

#onstr)#tion 0.50'


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A#id Waters


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WAS WAT!

Waste $ater +rom ready>mixed "lants is ahazardo)s s)bstan#e

Gra#ti#es "revented or limited by GA in#l)ded)m"ing at the *ob sited)m"ing at a landlld)m"ing into a "it at the ready>mix "lant

Can re)se it +or mixing ne$ #on#rete

se #hemi#al stabilizing admixt)res


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2T! EIMITATI21SGrevent im")rities in ra$ $ater

%3 S)s"ended solids Silt4 #lay4 "i"e $or, debris4 organi# matter and #olloids " to abo)t (000 ""m o+ s)s"ended #lay or silt #an be tolerated igher amo)nts may in#rease $ater demand4 in#rease drying

shrin,age or #a)se eBores#en#e

(3 Hissolved solids Colloids4 nonvolatile organi# #om"o)nds and salts

" to abo)t (000 ""m o+ total dissolved solids #an be#onsidered sa+e4 altho)gh it varies by #om"o)nd %00 ""m o+ sodi)m s)lde may #a)se "roblems4 $hile sea$ater

#an #ontain )" to 5


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WAT! /2! C!I17 A1H WASI17!e)irements +or #)ring $ater are less

stringent than mixing $ater be#a)se it is in#onta#t $ith the #on#rete +or only a relativelyshort time

1evertheless4 restri#tions do exist4 b)t thesame J"otableK $ater r)le a""lies

/or $ashing aggregates and e)i"ment4 thesame re)irements a""ly regarding im")rities

The s"e#i#ation are s)mmarized in ASTM

C;

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Concrete Class 06b Water