A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Cements and pozzolanic materials for prevention of AAR in concrete dams
Where it is not possible to avoid the use of an aggregate containing reactive constituents, a means for preventing or minimizing the risk of alkali-aggregate reaction (AAR) can be found in the most appropriate of the following options described in this paper: use a low-alkali portland cement so that the total quality of alkalis in the concrete mixture lies below a specified limit (North American experience has indicated that deleterious expansion from alkali-aggregate reaction is not likely to occur as long as the alkali content of portland cement does not exceed the equivalent of 0.60% Na/sub 2/O); use blended cements (it is assumed that the alkalis of mineral admixtures, being 'entrapped' in the hydrated silicates during the hydration process, are not promptly available to promote the alkali-aggregate reaction in the same manner as the alkalis derived from portland cement); replace part of the portland cement with finely ground granulated blast furnace slag or pozzolanic materials (investigations have to be made to ascertain the effectiveness of each pozzolanic material and to determine its optimum minimum addition to the reactive aggregate).
Cements and pozzolanic materials for prevention of AAR in concrete dams
Where it is not possible to avoid the use of an aggregate containing reactive constituents, a means for preventing or minimizing the risk of alkali-aggregate reaction (AAR) can be found in the most appropriate of the following options described in this paper: use a low-alkali portland cement so that the total quality of alkalis in the concrete mixture lies below a specified limit (North American experience has indicated that deleterious expansion from alkali-aggregate reaction is not likely to occur as long as the alkali content of portland cement does not exceed the equivalent of 0.60% Na/sub 2/O); use blended cements (it is assumed that the alkalis of mineral admixtures, being 'entrapped' in the hydrated silicates during the hydration process, are not promptly available to promote the alkali-aggregate reaction in the same manner as the alkalis derived from portland cement); replace part of the portland cement with finely ground granulated blast furnace slag or pozzolanic materials (investigations have to be made to ascertain the effectiveness of each pozzolanic material and to determine its optimum minimum addition to the reactive aggregate).
Cements and pozzolanic materials for prevention of AAR in concrete dams
M. Berra (author) / R. Turriziani (author)
1991
28 pages
Report
No indication
English
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