Three decades of studying the alkali reactivity of Canadian aggregates

From National Research Council Canada

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Author	Search for: Grattan-Bellew, P. E.¹; Search for: Gillott, J. E.
Affiliation	National Research Council of Canada. NRC Institute for Research in Construction
Sponsor	Search for: US Army Corps of Engineers
Format	Text, Article
Conference	Concrete Durability: Katharine and Bryant Mather Int. Conf.: 27 April 1987, Atlanta, Georgia, USA
Subject	bases (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; base (chimie); alkalinité; granulat; beton ( materiau); durabilité; pierre à chaux; mineral silicate
Abstract	Early 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	1987
In	ACI SP SP-100-70, no. 2 (1987): 1365–1384.
Language	English
Peer reviewed	Yes
Identifier	IRC-P-1478
NRC number	NRCC 28324 NRC-IRC-4549
NPARC number	20358726
Export citation	Export as RIS
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Record identifier	98144c17-1770-4514-8ef2-8cc15fadde16
Record created	2012-07-20
Record modified	2020-06-06

Date modified:: 2024-07-19