文档介绍：ACI 201 – Guide to Durable Concrete
Updates to AAR Chapter 5
Dr. Jason H. Ideker
Assistant Professor
Oregon State University
Outline
Current version of ACI -08, Ch 5
Proposed revisions to ACI -08
– Improved technical information on ASR and ACR
– Test Methods – significant focus here
– Guid ance for to M anagi ng ASR fo llow ing AASHTO
approach - Benoit
– 47 references added
– Summary
ACI - 08
Guide to Durable Concrete
Chapter 5: Alkali Aggregate Reaction
•Types of Reactions
•Evaluating Aggregates for Potential AAR
•Preventive Measures
Preventive Measures
TfRtiTypes of Reactions Evaluating Aggregates for
Potential AAR
•ACR – Alkali Carbonate Reaction •Field Performance •Use of nonreactive aggregate
little information •ASTM C 295 – Petrographic Exam •Use of low-alkali cement
•ASR – Alkali Silica Reaction ASR •Limits on alkali content (loading)
more in-depth information •ASTM C 227 – Mortar Bar Test •SlSupplementary cement ing
Referred to other documents •ASTM C 289 – Quick Chemical Test materials
within ACI •ASTM C 1260 – Accelerated Mortar •Fly ash and slag (together)
Bar Test •Silica fume
•ASTM C 1293 – Concrete Prism Test •Natural pozzolans
ACR •Tests for evaluating effect of
•ASTM C 586 – Rock Cylinder Test pozzolans and slag on ASR
•CSA -26A – Chemical Comp. •ASTM C 441