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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Glass Content Determination and Strength Development Predictions for Vitrified Blast Furnace Slag
Author(s): R. Doug Hooton and John J. Emery
Publication: Special Publication
Appears on pages(s): 943-962
Keywords: blast furnace slag; chemical analysis; compressive
strength; glass content; pellets; regression analysis; silica
Abstract:The estimated glass content of a vitrified slag is very sensitive to the method employed. The degree of vitrification (i.e., glass content) of a number of slags has been determined by several optical methods and X-ray diffraction. Based on this study, the XRD method is considered the most reliable. In this method the glass content is obtained by comparing the peak intensity ratios of a CaF. 2 internal standard to the mellilite and merwinite peaks in relation to those found for synthetic materials. The "McMaster Optical Method" that involves individual, optical particle analysis under crossed polars can be correlated to the XRD approach for rapid laboratory use. As part of this overall study, it has been shown that the compressive strengths of mortars containing 70 percent ground slag/30 percent portland cement as the binder can be related to the chemical composition, fineness of grinding and degree of vitrification by XRD. Of these parameters, key oxide chemistry and degree of vitrification are most important, with the best correlation at 7 day strengths. Since early strength development is important in applications, the hydraulicity prediction method will be of help during slag selection. However, it still appears that performance criteria (i.e., compressive strength development) are more realistic and should be adopted in specifications.
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