ASTM-C563 Standard Guide for Approximation of Optimum SO3 in Hydraulic Cement

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Standard Guide for Approximation of Optimum SO3 in Hydraulic Cement



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1.1 This test method describes the determination of optimum SO for maximum 24-h compressive strength by measuring the change in strength produced in hydraulic cement mortar as a result of substituting calcium sulfate for a portion of the cement. Usually, but not always, the SO content that produces the highest 24-h strength at 23°C also produces approximately the lowest expansion in water and the lowest contraction in air at that temperature.

1.2 This test method refers to the sulfur trioxide (SO ) content of the cement only. Slag cements and occasionally other hydraulic cements can contain sulfide or other forms of sulfur. The determination of SO content by rapid methods may include these other forms, and may therefore produce a significant error. If a significant error occurs, analyze the cement for SO content using the reference test method of Test Methods C114 for sulfur trioxide.

1.3 Values stated as SI units are to be regarded as standard.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


Compression testing-cement/concrete; optimum SO3-hydrauliccement, using 24-h compressive strength test; Hydraulic cement; Portland cement; Sulfur trioxide (SO3) content; Twenty-four hour testing; optimum SO3-hydraulic cement, using 24-h compressive strength; ICS Number Code 91.100.10 (Cement. Gypsum. Lime. Mortar)

To find similar documents by ASTM Volume:

04.01 (Cement; Lime; Gypsum)

To find similar documents by classification:

91.100.10 (Cement. Gypsum. Lime. Mortar)

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Publication Date

July 17, 2020

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Test Method

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