alkali-aggregate reaction


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alkali-aggregate reaction

[′al·kə‚lī ′ag·rə·gət rē′ak·shən]
(chemistry)
The chemical reaction of an aggregate with the alkali in a cement, resulting in a weakening of the concrete.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

alkali-aggregate reaction

A chemical reaction in mortar or concrete between alkalies from portland cement or other sources and certain constituents of some aggregates; under certain conditions, deleterious expansion of the concrete or mortar may result.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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References in periodicals archive ?
Godart, "Eliminating alkali-aggregate reaction from long service structures," in Proceedings of the 14th International Conference on alkali-aggregate Reactivity in Concrete, T.
[8] RILEM Technical Committee 219-ACS, "RILEM recommendations for the prevention of damage by alkali-aggregate reactions in new concrete structures," in RILEM State-of-the-Art Report, P.
For the evaluation tests of the alkali-aggregate reaction, prismatic samples of 25 x 25 x 250 cm were produced for each type of compound.
Tests of the Alkali-Aggregate Reaction. The average results of the three measurements and the respective standard deviations of the corresponding measurements obtained from the alkali-silica reaction test are shown in Figure 4.
Advanced Seminar on Alkali-Aggregate Reaction. Queen Mary and Westfield College, University of London, 1990, p.
Alkali-Aggregate Reaction. As well known, the coexistence of reactive aggregates, alkali, and water is prerequisite to the initiation of alkali-aggregate reaction (AAR) [14].
Alkali-Aggregate Reaction. Table 2 shows chemical composition of cement used for the structure.
Recent developments in the instrumentation make it possible to use Raman spectroscopy as a tool for identification of cement phases including different polymorphic and crystalline forms, investigation of cement hydration, admixtures, concrete-polymer and alkali-aggregate reactions, and concrete carbonation.
On the aar susceptibility of granitic and quartzitic aggregates in view of petrographic characteristics and accelerated testing, in 14th International Conference on Alkali-Aggregate Reactions in Concrete, 20- 25 May 2012, Austin, Texas, USA.
Reclassification of alkali aggregate reaction, in 14th International Conference on Alkali-Aggregate Reactions in Concrete, 20-25 May 2012, Austin, Texas, USA.