The effect of temperature on rheology of cement paste and of fresh self compacting concrete Jacek Gołaszewski Silesian University of Technology [email protected]
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The effect of temperatureon rheology of cement paste and
of fresh self compacting concrete
Jacek GołaszewskiSilesian University of Technology
IntroductionIntroduction
TTemperature considerably emperature considerably influencesinfluences rheological properties of fresh rheological properties of fresh concreteconcrete
CChanges in temperature may lead to loss of selfhanges in temperature may lead to loss of self--compacting properties compacting properties and make very difficult to cast concrete properlyand make very difficult to cast concrete properly
OOnly limited systematical data nly limited systematical data on on influence of temperature on rheological influence of temperature on rheological properties of fresh self-compacting concreteproperties of fresh self-compacting concrete are availableare available
Temperature must be taken into account during SCC mixture designing Temperature must be taken into account during SCC mixture designing and development and development
0
10
20
30
40
10 20 30
TEMPERATURA, o C
g, N
mm
…..
PE1 PE3 PCpo 10 min
0
10
20
30
40
10 20 30
TEMPERATURA, o C
g, N
mm
…..
PE1 PE3 PCpo 10 min
0
10
20
30
40
10 20 30
TEMPERATURA, o C
g, N
mm
…..
PE1 PE3 PCpo 10 min
CC33A - 2% A - 2% SSwc wc – 320 m– 320 m22/kg/kg NaNa22OOe e – 0,3%– 0,3%
0
10
20
30
40
10 20 30
TEMPERATURA, o C
g, N
mm
…..
PE1 PE3 PC
PE1 PE3 PC
po 10 min
po 60 min
0
10
20
30
40
10 20 30
TEMPERATURA, o C
g, N
mm
…..
PE1 PE3 PC
PE1 PE3 PC
po 10 min
po 60 min
0
10
20
30
40
10 20 30
TEMPERATURA, o C
g, N
mm
…..
PE1 PE3 PC
PE1 PE3 PC
po 10 min
po 60 min
Yield value gYield value g
Temperature and rheology of Temperature and rheology of mixesmixes with with different cement – SP systemdifferent cement – SP system
TEMPERATURE, oC TEMPERATURE, oC TEMPERATURE, oC
CC33A - 12% A - 12% SSwc wc – 420 m– 420 m22/kg/kg NaNa22OOe e – 1,1%– 1,1%
0
10
20
30
40
50
10 20 30
TEMPERATURA, o C
g, N
mm
…..
PE1 PE3 PCpo 10 min
0
10
20
30
40
50
10 20 30
TEMPERATURA, o C
g, N
mm
…..
PE1 PE3 PCpo 10 min
0
10
20
30
40
50
10 20 30
TEMPERATURA, o C
g, N
mm
…..
PE1 PE3 PCpo 10 min
0
10
20
30
40
50
10 20 30
TEMPERATURA, o C
g, N
mm
…..
PE1 PE3 PC
PE1 PE3 PC
po 10 min
po 60 min
0
10
20
30
40
50
10 20 30
TEMPERATURA, o C
g, N
mm
…..
PE1 PE3 PC
PE1 PE3 PC
po 10 min
po 60 min
0
10
20
30
40
50
10 20 30
TEMPERATURA, o C
g, N
mm
…..
PE1 PE3 PC
PE1 PE3 PC
po 10 min
po 60 min
Yield value gYield value g
Temperature and rheology of Temperature and rheology of mixesmixes with with different cement – SP systemdifferent cement – SP system
TEMPERATURE, oC TEMPERATURE, oC TEMPERATURE, oC
CC33A - 2A - 2÷÷12% 12% SSwc wc – 320– 320÷÷420 m420 m22/kg/kgNaNa22OOe e – 0,30– 0,30÷÷1,1%1,1%
0
5
10
15
20
25
30
10 20 30
TEMPERATURA, o C
h, N
mm
s…
..
PE1 PE3 PC
PE1 PE3 PC
2%
12%
0
5
10
15
20
25
30
10 20 30
TEMPERATURA, o C
h, N
mm
s…
..
PE1 PE3 PC
PE1 PE3 PC
320 m2/kg
420 m2/kg
0
5
10
15
20
25
30
10 20 30
TEMPERATURA, o C
h, N
mm
s…
..
PE1 PE3 PC
PE1 PE3 PC
0,3%
1,1%
CC33AA NaNa22OOeeSSwcwc
Plastic viscosity hPlastic viscosity h
Temperature and rheology of Temperature and rheology of mixesmixes with with different cement – SP systemdifferent cement – SP system
TEMPERATURE, oC TEMPERATURE, oC TEMPERATURE, oC
IntroductionIntroduction
CChanges in rheological properties of mixtures with temperature show hanges in rheological properties of mixtures with temperature show ambiguous trends. ambiguous trends.
IIt is difficult to predict t is difficult to predict changes inchanges in rheological propertiesrheological properties of of SCCSCC mixture mixture caused by changes incaused by changes in temperature. temperature.
Influence of temperature on compatibility of cement and superplasticizer Influence of temperature on compatibility of cement and superplasticizer system and on rheological properties of fresh concrete should be system and on rheological properties of fresh concrete should be
experimentally established during mixture designing and development.experimentally established during mixture designing and development.
IntroductionIntroduction
OObtained relationships of influence of different technological factors on btained relationships of influence of different technological factors on rheological properties of cement paste, mortar and fresh concrete not rheological properties of cement paste, mortar and fresh concrete not
always are unequivocalalways are unequivocal
Testing Testing compatibility of cement and superplasticizer system and compatibility of cement and superplasticizer system and self-self-compactingcompacting mixture designing and development mixture designing and development cement paste cement paste
rheologyrheology..
Does temperature changes similarly rheological properties of cement Does temperature changes similarly rheological properties of cement paste and self-compacting mixture?paste and self-compacting mixture?
Testing programTesting program
φφkzkz
1.451.45
1.351.35
1.551.55
1.651.65
SP SP
5 x PE SP5 x PE SP
w/bw/b
0.300.30
0.400.40
φkz factor of uncompacted aggregate filling by cement paste 1.751.75
TemperatureTemperature
10, 20, 3010, 20, 30ooCC
Cement paste
Fresh concrete
Materials and proportionsMaterials and proportions
Cement Cement II/B-SII/B-S + + limestone powder limestone powder
480 – 650 kg/m480 – 650 kg/m33
Coarse aggregateCoarse aggregate 0 – 16 mm0 – 16 mm
Pas
sin
g b
y si
eve,
%
0
98,4
36,3
19,1
4,20,2
49,3
79,0
62,8
0
20
40
60
80
100
0 0,125 0,25 0,5 1 2 4 8 16
Sieve size , mm
Pas
sing
by
siev
e , %Cement paste volumeCement paste volume
330 – 380 dm/m330 – 380 dm/m33
w/b = 0,30 – 0,40w/b = 0,30 – 0,40SP = 1 – 0.7%SP = 1 – 0.7%
Testing methodTesting method
Cement paste and fresh Cement paste and fresh concrete mixture exhibit concrete mixture exhibit the Bingham viscoplastic the Bingham viscoplastic
behaviour behaviour
rheological parameters: rheological parameters: yield value and plastic yield value and plastic
viscosityviscosity
Schleibinger BT2 RheometerSchleibinger BT2 RheometerFlow testFlow test
w/b = 0.30w/b = 0.30after 20 minafter 20 min
Inflence of temperature Inflence of temperature on cement pasteon cement paste
0
1
2
3
4
5
6
7
8
10 20 30
Temperature, o C
Flo
w t
ime
, s
SP1
SP2
SP3
SP4
SP5
250
270
290
310
330
350
370
390
410
430
10 20 30
Temperature, o C
Slu
mp
flo
w,
mm
SP1
SP2
SP3
SP4
SP5
SP1SP1
Inflence of temperature Inflence of temperature on cement pasteon cement paste
250
270
290
310
330
350
370
390
410
430
10 20 30
Temperature, o C
Slu
mp
flo
w,
mm
w/c = 0.30
w/c = 0.40
0
1
2
3
4
5
6
7
8
10 20 30
Temperature, o C
Slu
mp
flo
w,
mm
w/c = 0.30
w/c = 0.40
w/c = 0.30w/c = 0.30
0
200
400
600
800
10 20 30
Temperature, O C
Yie
ld v
alu
e g
, Nm
m
0
200
400
600
800
10 20 30
Temperature, O C
Yie
ld v
alu
e g
, Nm
m
1.35
1.45
1.55
1.65
1.75
1.35
1.45
1.55
1.65
1.75
kz
after 20 minafter 20 min after 60 minafter 60 min
Inflence of temperature on SCC Inflence of temperature on SCC yield value gyield value g
kz
0
200
400
600
800
10 20 30
Temperature, O C
Yie
ld v
alu
e g
, Nm
m
w/c = 0.40w/c = 0.40
Inflence of temperature on SCC Inflence of temperature on SCC yield value gyield value g
1.35
1.45
1.55
1.65
1.75
kz
after 20 minafter 20 min after 60 minafter 60 min
0
200
400
600
800
10 20 30
Temperature, O C
Yie
ld v
alu
e g
, Nm
m
1.35
1.45
1.55
1.65
1.75
kz
0
2000
4000
6000
8000
10 20 30
Temperature, O C
Pla
sti
c v
isc
os
ity
h, N
mm
min
w/c = 0.30w/c = 0.30
Inflence of temperature on SCC Inflence of temperature on SCC plastic viscosity hplastic viscosity h
after 20 minafter 20 min after 60 minafter 60 min
kz
0
2000
4000
6000
8000
10 20 30
Temperature, O C
Pla
sti
c v
isc
os
ity
h, N
mm
min
1.351.451.551.651.75
kz
1.351.451.551.651.75
0
2000
4000
6000
8000
10 20 30
Temperature, O C
Pla
sti
c v
isc
os
ity
h, N
mm
min
0
2000
4000
6000
8000
10 20 30
Temperature, O C
Pla
sti
c v
isc
os
ity
h, N
mm
min
w/c = 0.40w/c = 0.40
Inflence of temperature on SCC Inflence of temperature on SCC plastic viscosity hplastic viscosity h
after 20 minafter 20 min after 60 minafter 60 min
kz
1.35
1.45
1.55
1.65
1.75
kz
1.35
1.45
1.55
1.65
1.75
Influence of temperatureInfluence of temperatureCement paste vs SCC mixtureCement paste vs SCC mixture
TemperatureTemperature
Yield valueYield value Plastic viscosityPlastic viscosity
Cement pasteCement paste =
SCC mixtureSCC mixture
SCC mortarSCC mortar
ConclusionsConclusions
Temperature influences rheology of cement paste and fresh self-Temperature influences rheology of cement paste and fresh self-compacting concrete. Temperature is an important factor which must be compacting concrete. Temperature is an important factor which must be
taken into account in designing and development self-compacting taken into account in designing and development self-compacting concrete. concrete.
Testing influence of temperature on cement paste may be inadequate for Testing influence of temperature on cement paste may be inadequate for selection of compatible cement – superplasticizer system and in selection of compatible cement – superplasticizer system and in
designing workability of self-compacting concrete. designing workability of self-compacting concrete.
The results obtained with mortars generally may be used for predicting The results obtained with mortars generally may be used for predicting trends of changes in rheological behavior of fresh concrete in different trends of changes in rheological behavior of fresh concrete in different
temperatures. temperatures.
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