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Significance and Use
5.1 This test method provides a relatively simple and reliable microscopical means of measuring the phase abundance of portland cement clinker ( ). Microscopical point counting provides a direct measure of the clinker phase composition in contrast to the calculated Bogue phase composition ( ).
Note 1: This test method utilizes a reflected light microscope. Related methods such as transmitted light microscopy, scanning electron microscopy, and automated imaging techniques may also be used for clinker analysis but are not presently included in this test method.
Note 2: This test method allows direct determination of the proportion of each individual phase in portland cement clinker. This test method is intended to provide an alternative to the indirect estimation of phase proportion using the equations in Specification (footnote C in Table 1 and footnote B in Table 2).
5.2 This test method assumes the operator is qualified to operate a reflected light microscope and the required accessories, is able to correctly prepare polished sections and use necessary etchants, and is able to correctly identify the constituent phases.
5.3 This test method may be used as part of a quality control program in cement manufacturing as well as a troubleshooting tool. Microscopic characterization of clinker phases may also aid in correlating cement properties and cement performance in concrete, to the extent that properties and performance are a function of phase composition.
1.1 This test method covers a systematic procedure for measuring the percentage volume of the phases in portland cement clinker by microscopy.
1.2 The values stated in SI units are to be regarded as the standard.
1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
C150/C150M Specification for Portland Cement
C219 Terminology Relating to Hydraulic and Other Inorganic Cements
C670 Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials
D75/D75M Practice for Sampling Aggregates
D3665 Practice for Random Sampling of Construction Materials
ICS Number Code 91.100.10 (Cement. Gypsum. Lime. Mortar)
UNSPSC Code 30111601(Cement)
|Link to Active (This link will always route to the current Active version of the standard.)|
ASTM C1356-07(2020), Standard Test Method for Quantitative Determination of Phases in Portland Cement Clinker by Microscopical Point-Count Procedure, ASTM International, West Conshohocken, PA, 2020, www.astm.orgBack to Top