tailieunhanh - Designation: C 563 – 96 - Optimum SO3 in Hydraulic Cement Using 24-h Compressive Strength1

This standard is issued under the fixed designation C 563; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval. | Designation C 563 96 Standard Test Method for Optimum SO3 in Hydraulic Cement Using 24-h Compressive Strength1 This standard is issued under the fixed d ii r atic n c 563 the number immediately following the designation indicates the year of original adoption or in the case of revision the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. 1. Scope This test method describes the determination of optimum SO3 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 SO3 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. This test method refers to the sulfur trioxide SO3 content of the cement only. Slag cements and occasionally other hydraulic cements can contain sul de or other forms of sulfur. The determination of SO3 content by rapid methods may include these other forms and may therefore produce a significant error. Iff a cement for SO3 content using the reference test method of Test Methods C 114 for sulfur trioxide. Values stated as SI units are to be regarded as standard. 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. 2. Referenced Documents ASTM Standards C 109 C 109M Test Method for Compressive Strength of Hydraulic Cement Mortars Using 2-in. or 50-mm Cube Specimens 2 C 114 Test Methods for Chemical Analysis of Hydraulic Cement2 C 150 Specification for Portland Cc lm ln2 C 204 Test .