Latest developments in the standardization of concrete
Transcript of Latest developments in the standardization of concrete
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Latest developments in the
standardization of concrete
Christoph Müller, VDZ
Chairman CEN/TC 104
JRC Side-event to the
Standardization Summit - Construction Standards
3 June Riga
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AGENDA
2
1 Concepts for durable concrete structures
2 Concrete Pavements – an overview
3 Conclusions
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AGENDA
3
1 Concepts for durable concrete structures
2 Concrete Pavements – an overview
3 Conclusions
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Relationships between EN 206 and standards for design
and execution
EN 206 Concrete - Specification, performance, production and conformity
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Relationships between EN 206 and standards for
constituents and test standards
EN 206 Concrete - Specification, performance, production and conformity
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CPR: Basic requirement for construction works No. 7
7. Sustainable use of natural resources
The construction works must be designed, built and demolished in such a way
that the use of natural resources is sustainable and in particular ensure the
following:
re-use or recyclability of the construction works, their materials and parts
after demolition;
durability of the construction works;
use of environmentally compatible raw and secondary materials in the
construction works.
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Elements to ensure Concrete durability
Detection and
specification of the
exposure conditions
Concrete cover
Composition /
performance of the
concrete
Execution
requirements:
Curing etc.
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Exposure conditions in Europe
8 Source: wikipedia
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European concrete standard EN 206:
Requirements related to Durability (exposure classes)
Exposure-
class
European
name
Zero Risk X0 No risk of attack
Explanation
XD
Carbonation
De-icing salt
Sea
corrosion of
reinforcement
caused by
XC
XS
Carbonation
Chloride without sea water
Sea water
XF Frost
Chemical Attack
Corrosion of
concrete caused by XA
Frost and deicing salts
Chemical attack
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Recommended limiting values for composition of concrete
Exposure classes
Maximum w/c
Miniumum
strength class
Minimum
cement content kg/m³
XC1 XC2 XC3 XC4 XS1
XD1
XS2
XD2
XS3
XD3
Carbonation-induced corrosion
Chloride-induced
corrosion XS = Sea water
XD = Chloride from other than form
sea water
0.65 0.60 0.55 0.50 0.50
0.55
0.45
0.55 0.45
C20/25 C25/30 C30/37 C30/37 C30/37 C35/45
C30/37 C35/45
260 280 280 300 300 320
300
340
320
Minimum
air content % - - - - - - -
10
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Recommended limiting values for composition of concrete
Exposure classes
Maximum w/c
Minimum
strength class
Minimum
cement content kg/m³
XF1 XF2 XF3 XF4 XA1 XA2 XA3
Freeze/thaw attack with
or without de-icing agents
Aggressive chemical
environments
0.55 0.55 0.50 0.45 0.55 0.50 0.45
C30/37 C25/30 C30/37 C30/37 C30/37 C30/37 C35/45
300 300 320 340 300 320 360
Minimum
air content % - 4.0 4.0 4.0 - - -
National Application Rules
11
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Comparison of cement application in Europe:
Example “Concrete for exterior building elements (XF1)"
State max.
w/ceq
min.
c CEM I
CEM II CEM III CEM IV CEM V
S L/LL M
kg/m³ A B A B A B A B A B A B
Austria 0.55 300 x x x x (x) x (x) x (x)
Belgium 0.55 300 x x x x x x x x x (x)
Denmark 0.55 150 (x) (x)
Finland 0.60 270 x x x x x x x
France 0.60 280 * x x x x x x x x x x x x x
Germany 0.60 280 x x x x ● (x) (x) x x ● (x) (x) (x)
Ireland 0.60 300 x x
Italy 0.50 320 x x x x x x x x x x x x x
Netherlands 0.55 300 x x x (x) (x) (x) (x) x x (x) (x) (x) (x)
Norway 0.60 250 x x x
United Kingdom 0.60 280 x x x x x x x (x) (x)
x (x) ● not mentioned use allowed with limitations use not allowed
* an (x) Indicates that there are qualifications, e.g. types of main constituents. 12
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Comparison of cement application in Europe:
Example “Concrete for exterior building elements (XF1)"
State max.
w/ceq
min.
c CEM I
CEM II CEM III CEM IV CEM V
S L/LL M
kg/m³ A B A B A B A B A B A B
Austria 0.55 300 x x x x (x) x (x) x (x)
Belgium 0.55 300 x x x x x x x x x (x)
Denmark 0.55 150 (x) (x)
Finland 0.60 270 x x x x x x x
France 0.60 280 * x x x x x x x x x x x x x
Germany 0.60 280 x x x x ● (x) (x) x x ● (x) (x) (x)
Ireland 0.60 300 x x
Italy 0.50 320 x x x x x x x x x x x x x
Netherlands 0.55 300 x x x (x) (x) (x) (x) x x (x) (x) (x) (x)
Norway 0.60 250 x x x
United Kingdom 0.60 280 x x x x x x x (x) (x)
x (x) ● not mentioned use allowed with limitations use not allowed
* an (x) Indicates that there are qualifications, e.g. types of main constituents. 13
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Carbonation in the laboratory
Storage: 1 day in the mould
6 days under water,
> 7 d 20 °C / 65 % r. H. 0,0
2,5
5,0
7,5
10,0
0 50 100 150 200
Prüfalter in Tagen
Ca
rbo
na
tisie
run
gstie
fe in
mm
c = 260 kg/m3
w/z = 0.65
Age in days
Carb
onation d
epth
in m
m
CEM I bis CEM III/B
Range of performance
in the laboratory
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Well-tried and proven in practice
- locally available materials
- ambient conditions
- local design/building tradition
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Future of EN 206
Approach: Durability/Resistance classes of concrete?
today:
Exposure classes normative (“standardised ambient conditions” )
and national requirements for concrete
new:
Definition of (lab)performance of concrete regarding durability
(resistance classes) and
national regulation for application of concrete according to the
respective ambient conditions (on the basis of SLD?)
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Proposal of resistance classes carbonation (Basis: 7d under water and 50a in 20 °C /65 r. H.)
Carbonation depth xc [mm]
Re
lative
fre
qu
en
cy [-]
depth X [mm] / rate K [mm/a0.5]
RC20 RC40 RC30 RC50 RC60
0 20/2.8 30/4.2 40 /5.7 50/7.1 60/8.5
10% probability
Carbonation depth xc [mm]
xc,90 = 90% quantile
Corresponding carbonation rate k [mm/a0.5]
0 1.4 2.8 4.2 5.7 7.1 8.5 0 1.4 2.8 4.2 5.7 7.1 8.5
Corresponding carbonation rate k [mm/a0.5]
10% probability
xc,90 = 90% quantile
17 TU Munich, Gehlen, Greve-Dierfeld (presentation Brussels 22.10.2014)
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Connection between resistance class and concrete cover
Design service life tSL
RCX [mm]
curing 7 Tage (kc=1)
semiprobabilistic calculation RC50
cmin = 27 mm is required for XC4
semiprobabilistic calculation RC30
cmin = 18 mm is required for XC4
18 TU Munich, Gehlen, Greve-Dierfeld (presentation Brussels 22.10.2014)
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Connection between resistance class and concrete cover
Design service life tSL
RCX [mm]
curing 7 Tage (kc=1)
semiprobabilistic calculation RC50
cmin = 27 mm is required for XC4
semiprobabilistic calculation RC30
cmin = 18 mm is required for XC4
TU Munich, Gehlen, Greve-Dierfeld (presentation Brussels 22.10.2014) 19
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Resistance classes vs. current practice in Germany
20
0
2
4
6
8
10
12
CEM I CEM II/B-M CEM III/A CEM III/B
Vc
,14
0d
in
mm
/√a
7d pre-storage
RC20
RC30
RC40
RC50
RC60
DIBt limit
RC20
RC30
RC40
RC50
RC60
c w/c g
450 g/mixture 0.50 1350 g/mixture Preliminary storage: 7d
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Resistance classes in EN 206?
A common European system for specifying the durability of concrete
(at present durability requirements are determined by provisions valid in the
place of use).
Further harmonization of EN 206 would be possible
A system that enables a significant increase in the use of new materials
(e. g. low carbon cements, secondary and recycled materials) without
compromising the durability of concrete.
Chances
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Resistance classes in EN 206?
Differentiation of the evaluation background that was implemented in current
practice in some countries depending on the test methods
Responsibility of the designer: „Pre-decision“ regarding choice of building
material Does the designer know, what materials are available in the
concrete plant?
In the event of a real „trade-off“ the quality assurance along the value-added
chain would have to be put on a new basis
Challenges
22
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European test/research program
Tools and procedures to proportion concrete mixes in the most sustainable
and economic manner without compromising durability or strength
23
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European test/research program
Funding by the EU required!
Tools and procedures to proportion concrete mixes in the most sustainable
and economic manner without compromising durability or strength
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AGENDA
25
1 Concepts for durable concrete structures
2 Concrete Pavements – an overview
3 Conclusions
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Activities in CEN/TC 227/WG 3: Materials for concrete roads
including joint fillers and sealants
New group TG 1 + 2:
Status of the different standards: discussion on the need of changes
– EN 13877-1 Concrete pavements - Part 1: Materials
– EN 13877-2 Concrete pavements - Part 2: Functional requirements for
concrete pavements
– EN 13877-3 Concrete pavements - Part 3: Specifications for dowels to be
used in concrete pavements
3 meetings (first meeting Stockholm, 2014-03-24)
Example for aspects to be discussed:
part 2: Freeze-thaw requirements have no relation to the test method
26
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Scaling of concretes with artificial air-voids
slab test vs. CDF test
0,0
1,0
2,0
3,0
4,0
5,0
6,0
0 7 14 21 28 35 42 49 56
Cement 6
Cement 7
Cement 8
Cement 9
Sca
ling
in
kg
/m2
c = 320 kg/m3
w/c = 0.50
AEA
Freeze-Thaw-Cycles
Slab test
acceptance
criterion
0,0
1,0
2,0
3,0
4,0
5,0
6,0
0 7 14 21 28 35 42 49 56
Cement 6
Cement 7
Cement 8
Cement 9
Sca
ling
in
kg
/m2
c = 320 kg/m3
w/c = 0.50
AEA
Freeze-Thaw-Cycles
CDF-
acceptance
criterion
27
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Damage due to Alkali-Silica-Reaction (ASR)
Pictures: Landesbetrieb Bau Sachsen-Anhalt 28
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ASR performance test
method for evaluation of damage
potential of concrete compositions
60°C concrete test of the Research
Institute of the Cement Industry (FIZ),
Düsseldorf
preliminary storage
14 d
20°C
65%
6 d
20°C
100%
1 d
20°C
100%
6 d
60°C
100%
1 d
20°C
100%
age in days 0 28 35 42
cycle 2 alternating storage cycle 1 (14d)
2 d
20°C
NaCl*
5 d
60°C
oven
5 d
60°C
oven
6 d
60°C
100%
1 d
20°C
100%
* e.g. 3% NaCl solution 29
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Drill core halves of pavements in 60°C concrete test - 3% NaCl solution
0,0
0,5
1,0
1,5
2,0
2,5
3,0
0 28 56 84 112 140 168 196
De
hn
un
g v
on
je
we
ils z
we
i B
oh
rke
rnh
äft
en
[m
m/m
]
Zeit [Tag]
BK1
BK2
BK3
BK4
BK5
BK6
BK7
BK8
BK9
BK10
BK11
Schadenskategorie III: Substanzverlust (Verschotterung)Schadenskategorie II: beginnenden und ausgeprägte
Risse Schadenskategorie I: Verfärbung im Bereich der
Querfugen/Fugenkreuzekein Schaden
Schadenskategorie III: Substanzverlust (Verschotterung)Schadenskategorie II: beginnenden und ausgeprägte
Risse Schadenskategorie I: Verfärbung im Bereich der
Querfugen/Fugenkreuzekein Schaden
Schadenskategorie III: Substanzverlust (Verschotterung)Schadenskategorie II: beginnenden und ausgeprägte
Risse Schadenskategorie I: Verfärbung im Bereich der
Querfugen/Fugenkreuzekein Schaden
Schadenskategorie III: Substanzverlust (Verschotterung)Schadenskategorie II: beginnenden und ausgeprägte
Risse Schadenskategorie I: Verfärbung im Bereich der
Querfugen/Fugenkreuzekein Schaden
Schadenskategorie III: Substanzverlust (Verschotterung)Schadenskategorie II: beginnende und ausgeprägte
Risse Schadenskategorie I: Verfärbung im Bereich der
Querfugen/Fugenkreuze bzw. Schwindrisse
kein Schaden
Avera
ge e
xpansio
n o
f tw
o
drill
core
halv
es [m
m/m
]
Damage category III: substance loss (crumbling)
Damage category II: incipient and pronounced cracks
Damage category I: discolouration in the area of the
transverse joints/joint intersections
or shrinkage cracks
No damage
storage time [days]
30
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Drill core halves of pavements in 60°C concrete test - 3% NaCl solution
0,0
0,1
0,2
0,3
0,4
0,5
0,6
0 28 56 84 112 140 168 196
Deh
nu
ng
von jew
eils
zw
ei
Boh
rkern
häften
[m
m/m
]
Zeit [Tag]
BK1
BK2
BK3
BK4
BK5
BK6
BK7
BK8
BK9
BK10
BK11
Schadenskategorie III: Substanzverlust (Verschotterung)Schadenskategorie II: beginnenden und ausgeprägte
Risse Schadenskategorie I: Verfärbung im Bereich der
Querfugen/Fugenkreuzekein Schaden
Schadenskategorie III: Substanzverlust (Verschotterung)Schadenskategorie II: beginnenden und ausgeprägte
Risse Schadenskategorie I: Verfärbung im Bereich der
Querfugen/Fugenkreuzekein Schaden
Schadenskategorie III: Substanzverlust (Verschotterung)Schadenskategorie II: beginnenden und ausgeprägte
Risse Schadenskategorie I: Verfärbung im Bereich der
Querfugen/Fugenkreuzekein Schaden
Schadenskategorie III: Substanzverlust (Verschotterung)Schadenskategorie II: beginnenden und ausgeprägte
Risse Schadenskategorie I: Verfärbung im Bereich der
Querfugen/Fugenkreuzekein Schaden
Schadenskategorie III: Substanzverlust (Verschotterung)Schadenskategorie II: beginnende und ausgeprägte
Risse Schadenskategorie I: Verfärbung im Bereich der
Querfugen/Fugenkreuze bzw. Schwindrisse
kein Schaden
Damage category III: substance loss (crumbling)
Damage category II: incipient and pronounced cracks
Damage category I: discolouration in the area of the
transverse joints/joint intersections
or shrinkage cracks
No damage
Avera
ge e
xpansio
n o
f tw
o
drill
core
halv
es [m
m/m
]
storage time [days]
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ASR performance test
0,0
0,2
0,4
0,6
0,8
1,0
0 28 56 84 112 140 168 196 224
Dehnung in m
m/m
Lagerungszeit in Tagen
Drilled core from the top layer (D > 8)
BAB A5 Direction Karlsruhe, Km 631,0
Year of construction 1988
Year of sampling 2006
Age on sampling: 18 years
Condition of the pavement:
– no damage
– slight cracking Avera
ge e
xpansio
n o
f tw
o
drill
core
halv
es [m
m/m
]
storage time [days]
32
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BAB A5 Direction Karlsruhe, Km 631,0 ─ 2006
Pictures : Siegfried Riffel, 2006
Age: 18 years
33
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Picture: Siegfried Riffel, 2014
BAB A5 Direction Karlsruhe, Km 631,0
Age: 26 years
34
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Airfields made of concrete
0,0
0,1
0,2
0,3
0,4
0,5
0,6
0,7
0,8
0,9
1,0
0 28 56 84 112 140 168 196 224
Alter in Tagen
Dehnung
in m
m/m
Prüflösung: 0,6 mol/l KF-HOT
not suitable
suitable
Exp
an
sio
n in m
m/m
Age in days
Test solution: 0,6 mol/l KF-HOT
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Concrete for traffic areas
Roads
Airport runways
Rigid railway tracks for high-speed rail traffic
Heavily loaded urban roads or industrial areas
36
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Concrete for motorways
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Concrete not only for motorways
Bus stop and complete bus lanes
Bus stop with
concrete pavement Complete bus lanes
with concrete pavement
Concrete coloured
with pigments
Normal traffic on
asphalt pavement
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Road crossing in Vienna
Cars are stopping and accelerating
Problems may occur in asphalt layers
Example: Road crossing
Concrete: Deformation stability at high temperatures
40
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Instead of crossings: Roundabouts are often used
Concrete solutions build in Austria and Switzerland
Roundabout in Switzerland: Paving of concrete with a slipform paver
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First roundabout in Germany (Bad Sobernheim, 2007)
Situated in an industrial
area: Many lorries
Example of a
successful application
Presentation to
authorities and
construction firms
New roundabouts
in concrete are
planned
Advantages for
communities
- Less maintenance
- Lower life-cycle costs
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Ring roads in Saxony (East Germany, Leipzig)
Example: Concrete for ring roads
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Concrete also for lower loads
Farm roads (2 lines are paved)
Environment-friendly
Sealing of ground is mimimized
Water can drain between the lanes
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Concrete roads in Latvia
Roller Compacted Concrete (RCC) has
been proven as a practical solution under
Latvian climate conditions
(roads, streets, parking lots and
industrial areas; several RCC pilot road
sections, first RCC road in Latvia designed
for very heavy loads)
Using the potentials of concrete pavements
in road construction the infrastructure in
Latvia could be strengthened
Tattershall Quarry Haul road, UK
Source: ERMCO (by courtesy of
CEMEX UK Materials)
Construction of a roller-compacted
concrete road in Norway
Source: ERMCO
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AGENDA
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1 Concepts for durable concrete structures
2 Concrete Pavements – an overview
3 Conclusions
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Resistance classes in EN 206?
A common European system for specifying the durability of concrete
(at present durability requirements are determined by provisions valid in the
place of use)
Further harmonization of EN 206 would be possible
A system that enables a significant increase in the use of new materials
(e. g. low carbon cements, secondary and recycled materials) without
compromising the durability of concrete Sustainability !!
Several questions to be answered: European test/research program
Funding by the EU required!
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Concrete pavements in road construction
Concrete is a sustainable solution
- not only for motorways, but also for
- heavily loaded traffic areas (bus lanes, roundabouts, road crossing etc.)
Roller Compacted Concrete (RCC) has been proven as a practical solution in
Latvia (several RCC pilot road sections)
Using the potentials of concrete pavements in road construction the
infrastructure in Latvia could be strengthened
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Thank you for your kind attention!
Dr. Christoph Müller
VDZ gGmbH - www.vdz-online.de