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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 > Tools > Frequently Asked Questions
Q. What notable changes have taken place in the properties of portland cement as manufactured in the United States during the past years? A. The most notable changes in the manufacture of portland cement were brought about by the demand for higher early concrete strengths. The cement industry accomplished this by increasing the calcium and hence, the C3S content and fineness, which had the effect of nearly equivalent increases in both 7- and 28-day strength. In general, these changes have produced a Type I cement with characteristics very similar to those of a traditional high-early-strength Type III. In some parts of the country, higher early concrete strengths with Type II and Type V cements have been obtained with increased fineness. A major change has also been the use of microscopy to control composition and microstructure of the clinker. References: SP-1(02); E3-13 Topics in Concrete: Cementitious Material; Concrete Fundamentals
Q. What notable changes have taken place in the properties of portland cement as manufactured in the United States during the past years?
A. The most notable changes in the manufacture of portland cement were brought about by the demand for higher early concrete strengths. The cement industry accomplished this by increasing the calcium and hence, the
C3S content and fineness, which had the effect of nearly equivalent increases in both 7- and 28-day strength. In general, these changes have produced a Type I cement with characteristics very similar to those of a traditional high-early-strength Type III. In some parts of the country, higher early concrete strengths with Type II and Type V cements have been obtained with increased fineness. A major change has also been the use of microscopy to control composition and microstructure of the clinker.
References: SP-1(02); E3-13
Topics in Concrete: Cementitious Material; Concrete Fundamentals
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