Three decades of studying the alkali reactivity of Canadian aggregates

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Proceedings titleACI SP
ConferenceConcrete Durability: Katharine and Bryant Mather Int. Conf.: 27 April 1987, Atlanta, Georgia, USA
Pages136584; # of pages: 1282
Subjectbases (chemistry); alkalinity; aggregates; concrete ( materials); durability; limestone; silicate minerals; aggregates; alkali-aggregate reactions; alkali-carbonate reactions; concrete durability; dolomite; expansion; limestone; petrography; reviews; siliceous aggregates; expansion mechanisms; scanning electron microscopy (sem); x-ray diffraction; differential thermal analysis; Concrete
AbstractEarly studies of concrete durability problems resulting from expansive reactions between certain aggregates and cement alkalis implicated opal and other forms of poorly ordered silica as the reactive component in the aggregate. Later work showed that other types of rocks may expand in alkali and cause concrete durability problems as well. Glassy or poorly crystalline volcanic rocks, dolomitic limestones, greywackes, phyllites and argillites are now recognized as potentially deleteriously reactive. Standard tests were developed that involve the measurement of length-change of mortar bars, concrete prisms, and rock cylinders held under constant temperature and humidity conditions. Other tests have been used in attempts to gain a better understanding of the expansive mechanisms. Petrographic studies were carried out from an early date; with the introduction of more sophisticated equipment such as the scanning electron microscope, X-ray diffraction, and differential thermal analysis, petrography now plays an increased role in this area of engineering geology.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number28324
NPARC number20358726
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Record identifier98144c17-1770-4514-8ef2-8cc15fadde16
Record created2012-07-20
Record modified2016-05-09
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