00771111

Component

https://doi.org/10.3141/1668-07

http://scholar.google.com...gers&publication_year=1999

The approach now under consideration by the Canadian Standards Association's Technical Group on Alkali-Aggregate Reactions (AARs) to prevent the risk of deterioration associated with the use of potentially reactive aggregates in concrete is described. This approach involves a risk-evaluation process based on three factors judged critical for the development of damage in concrete structures due to alkali-silica reaction. The factors are (a) the degree of reactivity of the particular reactive aggregate, (b) the size of the concrete element and the environmental conditions it will face, and (c) the expected service life of the structure. The proposed preventive action against AARs will depend on the actual risk level thus determined. The action will involve one or a combination of the following approaches: (a) limit the alkali content in the concrete to a selected level, or (b) use an effective supplementary cementing material (SCM) (or an effective combination of SCMs) in sufficient amounts.

This paper appears in Transportation Research Record No. 1668, Concrete in Pavements and Structures.

English

p. 48-53

1999

Transportation Research Record

0309070635

Figures (1) ; References (14) ; Tables (5)

Alkali aggregate reactions; Alkali silica reactions; Concrete; Concrete structures; Deterioration; Environment; Prevention; Service life; Size

Design; Highways; Materials; Security and Emergencies; I32: Concrete

TRIS, TRB, ATRI

Oct 7 1999 12:00AM

• BOND INTERACTION BETWEEN CONCRETE PAVEMENT AND LEAN CONCRETE BASE
• CONCRETE CAPILLARY POROSITY AS IT RELATES TO DURABILITY OF PAVEMENTS BUILT WITH ALKALI-SILICA-REACTIVE AGGREGATES
• CRACKING DAMAGE/DETERIORATION AND REHABILITATION CONSIDERATIONS OF SOME BIRMINGHAM, ALABAMA, INTERSTATE BRIDGE DECKS
• EFFECT OF MICROCRACKING ON DURABILITY OF HIGH-STRENGTH CONCRETE
• GEOCHEMICAL METHOD FOR IDENTIFYING ALKALI-SILICA-REACTION GEL
• IMPACT OF PROCESSED CELLULOSE FIBERS ON PORTLAND CEMENT CONCRETE PROPERTIES
• INFLUENCE OF ALKALINE EARTH SILICATE ADMIXTURE ON DURABILITY OF PENNSYLVANIA TURNPIKE BRIDGES
• INFLUENCE OF TOTAL AGGREGATE GRADATION ON FREEZE-THAW DURABILITY AND OTHER PERFORMANCE MEASURES OF PAVING CONCRETE
• INVESTIGATION OF DESIGN PARAMETERS AFFECTING TRANSVERSE CRACKING IN JOINTED CONCRETE PAVEMENTS
• MITIGATION OF ALKALI-SILICA REACTION IN PAVEMENT PATCH CONCRETE THAT INCORPORATES HIGHLY REACTIVE FINE AGGREGATE
• USE OF A LITHIUM-BEARING ADMIXTURE TO SUPPRESS EXPANSION IN CONCRETE DUE TO ALKALI-SILICA REACTION
• VERY-EARLY-STRENGTH LATEX-MODIFIED CONCRETE OVERLAY
• VIRGINIA'S APPROACH TO EVALUATION OF CONCRETE RESISTANT TO ALKALI-SILICA REACTIONS