Canadian StCanadian StAlkali-Aggreg
Benoit FLaval University, Qu
ASTM 2010 SASTM 2010 S
y
ASTM 2010 SASTM 2010 S
St. LouisSt. Louis
tandards ontandards on gate reactions
Fournieruebec City, Canada
Spring MeetingSpring Meeting
y
Spring MeetingSpring Meeting
s, Missouris, Missouri
CSA A 23.1 & ACSA A 23.1 & A
Documents last published in 2(five year cycle)(five-year cycle)
CSA A23.1 Concrete materand methods of concrete construction
CSA A23.2 Test methods astandard practices for concret
A23.2 on AARA23.2 on AAR
2009
rials
nd te
CSA A 23.1 & ACSA A 23.1 & A
AAR-related specifications
CSA A23.1 requires that aggregates be non reactive or preventive measures be takenpreventive measures be taken
CSA A23.2 Three test methand two standard practices todetect and prevent AAR
15% of CSA standards A23.1 A23.2 deal with AAR
A23.2 on AARA23.2 on AAR
that
hods
&
CSA A 23.1 CSA A 23.1 –– AppenAppenInformativeInformativeInformativeInformative
General
f iTypes of alkali-aggregate reac
Methods for evaluating potenreactivity of aggregates (currother methods)
Distribution of potentially-rea
Measures to prevent AAR inMeasures to prevent AAR in potentially reactive aggregate
R i i f l i dReactivity of reclaimed concr
Summary
ndix B ndix B
ictions
ntial rent and
active aggregates across Canada
concrete incorporatingconcrete incorporating es
f l drete for use as recycled aggregate
Testing for AARTesting for AAR
CSA Standard Practice A2327A: Step by step procedu27A: Step-by-step procedu1) determining potential alk
reactivity of aggregates areactivity of aggregates, a2) selecting preventive meas
against ASR using a riskagainst ASR using a risk analysis approach.
RR
3.2-ure for:ure for:kali-andandsures
Standard PracticeStandard PracticeEvaluating of potenEvaluating of potenEvaluating of potenEvaluating of poten
of concrete of concrete Field performance surveyLaboratory test programy p g» Petrographic examination
(ASTM C 295)» Chemical Method: ACR
(CSA A23.2-26A)» Accelerated Mortar Bar M
(CSA A23.2-25A)» Concrete Prism Test: RA
(CSA A23.2-14A)
e CSA A23.2e CSA A23.2--27A 27A ntial alkalintial alkali--reactivityreactivityntial alkalintial alkali reactivity reactivity
aggregatesaggregatesy
mn: ACR & ASR
R
Method: RAS
AC & RAS
FFFFPerfoPerfo
SurveySurvey
FieldFieldField Field ormance ormance y of AARy of AAR
Laboratory iPetrographic Exa
Q i dQuarriedcarbonate
rocks
Aggregates other
than quarriedcarbonate rocks
ChemicalM h d
carbonate rocksOption: no
testing;the aggregate
N
Methodfor ACR
the aggregateis considered
highly reactive
Select preventive
PR
preventive measure Expansion
> limit
nvestigationsamination
d Othde
Otherrock types
AcceleratedMortar bar
NotPR
Expansion< limit
testPR
Expansion> li it A t
!?
Concretei
> limit
Expansion
Accept
PrismTest
p< limit
Petrographic
ASR
ExaminationEssential step:
Nature of aggregate (ACR, ASR)S l t b t t t t fSelect best test to perform
Risky to accept/reject aggregates based onaggregates based on petrographic examination only.
ASR ACR
Laboratory iPetrographic Exa
Q i dQuarriedcarbonate
rocks
Aggregates other
than quarriedcarbonate rocks
ChemicalM h d
carbonate rocksOption: no
testing;the aggregate
N
Methodfor ACR
the aggregateis considered
highly reactive
Select preventive
PR
preventive measure Expansion
> limit
Steelnvestigationsamination
d Oth
SteelSlag
de
Otherrock types Reject
AcceleratedMortar bar
NotPR
Expansion< limit
testPR
Expansion> li it A t
!?
Concretei
> limit
Expansion
Accept
PrismTest
p< limit
Chemical Method Chemical Method for ACRfor ACRfor ACRfor ACR
Screen test for quarried carbonate rocks *carbonate rocks *
Chemical analysis for yAl2O3, MgO and CaO
Zones for aggregatesZones for aggregates considered potentially expansives or
i (ACR)non-expansives (ACR)
Next step Concrete pPrism Test
Chemical Method Chemical Method for ACRfor ACRfor ACRfor ACR
Screen test for quarried carbonate rockscarbonate rocks
Chemical analysis for yAl2O3, MgO and CaO
Zones for aggregatesZones for aggregates considered potentially expansives or
i (ACR)non-expansives (ACR)
Next step Concrete pPrism Test
ACR
Test Method CSA A23.2-26A% Al2O3
Laboratory iPetrographic Exa
Q i dQuarriedcarbonate
rocks
Aggregates other
than quarriedcarbonate rocks
ChemicalM h d
carbonate rocksOption: no
testing;the aggregate
N
Methodfor ACR
the aggregateis considered
highly reactive
Select preventive
PR
preventive measure Expansion
> limit
Steelnvestigationsamination
d Oth
SteelSlag
de
Otherrock types Reject
AcceleratedMortar bar
NotPR
Expansion< limit
testPR
Expansion> li it A t
!?
Concretei
> limit
Expansion
Accept
PrismTest
p< limit
Accelerated MortaAccelerated Mortar Bar Test (AMBT)r Bar Test (AMBT)Bars immersed in 1N NaOH solution at 80oC for 14 daysat 80 C for 14 days
Laboratory iPetrographic Exa
Q i dQuarriedcarbonate
rocks
Aggregates other
than quarriedcarbonate rocks
ChemicalM h d
carbonate rocksOption: no
testing;the aggregate
N
Methodfor ACR
the aggregateis considered
highly reactive
Select preventive
PR
preventive measure Expansion
> limit
Steelnvestigationsamination
d Oth
SteelSlag
de
Otherrock types Reject
AcceleratedMortar bar
NotPR
Expansion< limit
testPR
Expansion> li it A t
!?
Concretei
> limit
Expansion
Accept
PrismTest
p< limit
Concrete Prism TestConcrete Prism Test
Concrete PrisConcrete Pris
Expansion limit of 0.04% Testing potential ASR and ACR of coarse or fine aggregatesBest test method available but often considered too long ( )(one year)
sm Test (CPT)sm Test (CPT)
at one year
0.3
0.2
nsio
n (%
)
0.1Exp
anCSA Limit
0.00 3 6 9 12
Age (Months)
Testing for AARTesting for AARCSA Standard Practice A227A: Step-by-step procedup y p p2) selecting preventive mea
against ASR using a riskagainst ASR using a riskanalysis approach based » Degree of reactivity of the» Degree of reactivity of the
agggregate» Size of element and
environmental conditions» Expected service life of th
structure
RR3.2-
ure for:asures kk
on:ee
e
Testing for AARTesting for AARCSA Standard Practice A23.2-28A: LaboratoryA23.2 28A: Laboratory testing to demonstrate theeffectiveness of SCMs andh i l d i tchemical admixtures
(LiNO3) to prevent ASR in concretein concrete» Concrete Prism Test
A l t d t t B» Accelerated mortart Bar Test
e d