Investigation of Mechanical Properties of Mass Concrete Affected by Alkali-Aggregate Reaction

The alkali-aggregate reaction (AAR) has been detected in the spillway driftway of the Furnas Hydroelectric Power Plant, Brazil, which was built in 1963. To investigate the properties of this concrete, several cores were drilled in the affected structure and ultrasonic tests in association with mecha...

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Bibliographic Details
Published inJournal of materials in civil engineering Vol. 21; no. 6; pp. 294 - 297
Main Authors Hasparyk, N. P, Monteiro, P. J, Dal Molin, D. C
Format Journal Article
LanguageEnglish
Published Reston, VA American Society of Civil Engineers 01.06.2009
Subjects
Applied sciences
Building failures (cracks, physical changes, etc.)
Buildings. Public works
Concretes. Mortars. Grouts
Corrosion
Durability. Pathology. Repairing. Maintenance
Exact sciences and technology
General (composition, classification, performance, standards, patents, etc.)
Materials
TECHNICAL NOTES
Construction materials
Mechanical properties
Alkali aggregate reaction
Experimental study
Assessments
Mechanical test
Deterioration
Failure analysis
Mass concrete
Test method
Ultrasonic methods
Damage
Ultrasonic method
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Summary:The alkali-aggregate reaction (AAR) has been detected in the spillway driftway of the Furnas Hydroelectric Power Plant, Brazil, which was built in 1963. To investigate the properties of this concrete, several cores were drilled in the affected structure and ultrasonic tests in association with mechanical tests were conducted. This paper presents the results of the following properties: splitting tensile strength, compressive strength, modulus of elasticity, and ultrasonic pulse velocity. For the ultrasonic tests, initial in situ determinations were performed on the driftway concrete surface under different exposure conditions before actual coring took place. The concrete cores drilled from the same location were tested by direct ultrasonic method before determining their mechanical properties. The ultrasonic results showed that the pulse velocity is sensitive to different degrees of deterioration due to AAR and correlates with the modulus of elasticity of the concretes investigated. Furthermore, the modulus of elasticity was the main property affected by AAR.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0899-1561
1943-5533
DOI:10.1061/(ASCE)0899-1561(2009)21:6(294)