Canadian StCanadian Sttandards ontandards on Alkali ... · CSA A 23.1 & A OAAR-related specifications OCSA A23.1 Ærequires that aggregates be non reactive or preventive measures

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



rocks

Aggregates other


ChemicalM h d



N

Methodfor ACR


highly reactive

Select preventive

PR


> limit

Steelnvestigationsamination

d Oth

SteelSlag

de

Otherrock types Reject


NotPR

Expansion< limit

testPR


!?

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



rocks

Aggregates other


ChemicalM h d



N

Methodfor ACR


highly reactive

Select preventive

PR


> limit


d Oth

SteelSlag

de



NotPR

Expansion< limit

testPR


!?

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



rocks

Aggregates other


ChemicalM h d



N

Methodfor ACR


highly reactive

Select preventive

PR


> limit


d Oth

SteelSlag

de



NotPR

Expansion< limit

testPR


!?

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