update on astm c150/aashto m 85 harmonization · 2010-02-04 · national cooperative highway...

Update on ASTM C150/AASHTO M 85

HarmonizationJustin Lashley, LafargeJoe Clendenen, Holcim

Outline/Purpose

AntitrustBackground of HarmonizationWhat needed to be harmonized?How did we harmonize?Example Material CertificationMnDOT Perspective – Maria Masten

What is a specification?

What is a specification?

Represents agreement based upon:OwnerUserProducer

Background of Harmonization

Joint effort between:Owners/Specifiers – Transportation Officials, EngineersUsers – Concrete Producers, ContractorsCement Producers

Effective July 2009 Editions of ASTM C150 and AASHTO M 85

Cement Market Drivers

Owner ExpectationsDurability, Economy

Product Performance DemandsEnvironmental Regulation/Sustainability

Clinker/ton (CO2) ReductionReduction in emissions, embodied energy, etc.

Why Harmonize?

Two Specifications – One PurposeASTM C150AASHTO M 85

Problem: Cement crosses borders, limited number of products can be supplied, so cement is designed to meet both, generally.Solution: Have consistent requirements that meet collective needs.

Why Harmonize?

ASTM – American Society of Testing and Materials

Composed of all aspects of industry

AASHTO – American Association of State Highway and Transportation Officials

Highway and Transportation Officials

ProvisionAASHTO M 85-04

ASTM C150-04a

Max Fineness (Blaine):

Single SampleAverage of 5

420 [I, II, IV, V]400 [I, II, IV, V]

No LimitNo Limit

Type II max C3S 58 No Limit

Processing Additions Max 1%

No Prescriptive Limit

Use of Limestone Not permitted Up to 5%

Specification Differences

Specifications Differences

Process Additions?Organic: Typically grinding AidsInorganic: Slag, fly ash, etc.

How do we Harmonize?

Can we agree on specifications and how?We want to know what is in our cement and what the effects could be!!Industry Steering Committee

National Cooperative Highway Research Program NCHRP Report 607

NCHRP Report 607

Literature ReviewTesting

Cement pasteMortarsConcrete

Over $500,000Almost 2 years to complete

NCHRP Report 607 Conclusions

Process AdditionsFound no effects at 1% or less (Inorganic and Organic)Virtually no detrimental effects up to 5% (Inorganic)Additions can typically benefit early performance by:

Acting as nucleation sitesDensification of the interfacial zone

NCHRP Report 607

We have the process addition results and we agree that additions should be allowed, now let’s

Harmonize

But we still want to know what is in our cement and what the impact on performance will be

HarmonizeASTM C150 and AASHTO M 85

Processing additionsInorganic Process Additions (IPA): Slag, fly ash, etc.

Must qualify if >1%Maximum 5%Only 1 IPA allowedMust list on mill report

Organic Process Additions (OPA): Typically grinding aidsMust qualifyMaximum 1%

What does qualify mean?

Qualify?

ASTM C465/AASHTO M 327Equivalent documents

Industrial Trial-plant testingSpecial grindCement with addition compared to cement without addition (control cement)

Involved process-not easy

Qualify?

Results compared to cement without addition

Cement TestingSetting timeMortar strength

Concrete TestingCompressive strengthsFlexural strength

We agree on process additionsInorganic Process Additions (IPA): Slag, fly ash, etc.

Must qualify if >1%Maximum 5%Only 1 IPA allowedMust list on mill report

Organic Process Additions (OPA): Typically grinding aidsMust qualifyMaximum 1%

Same chemical and physical requirements as before

Harmonized

ProvisionAASHTO M 85-04

ASTM C150-04a

AASHTO M 85-09ASTM C150-09

Max Fineness (Blaine):

Single SampleAverage of 5

420 [I, II, IV, V]400 [I, II, IV, V]

No LimitNo Limit

430 [II (MH)*, IV]None

Type II max C3S 58 No Limit Type II(MH)4.75C3A+C3S≤100

Processing Additions Max 1%

No Prescriptive Limit

Organic ≤ 1%Inorganic ≤ 5%

Use of Limestone Not permitted Up to 5% Up to 5%

*Exemption for low heat index Type II (MH) 4.75C3A+C3S≤90

Current Specifications

Example Mill Cert