ASTM C22-00(R2021) pdf free download
ASTM C22-00(R2021) pdf free download.Standard Specification for Gypsum
1. Scope
1.1 This specification covers gypsum, calcium sulfate com- bined with two molecules of water in crystalline form and having the approximate chemical formula CaSO 4 ·2H 2 O.
1.2 The values stated in either inch-pound units or SI (metric) are to be regarded separately as the standard. Within the text, the SI units are shown in brackets. The values stated in each system shall be used independently of the other. Values from the two systems shall not be combined.
1.3 The text of this specification references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the specification.
1.4 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
6.1 Bulk—When gypsum is shipped in bulk, samples of approximately 5 lb [2 kg] each shall be taken at regular intervals during the complete loading or unloading of the carrier, in such a way as to accumulate not less than 200 lb [90 kg] of material and to represent correctly the percentages of both the coarse particles and the fines in the shipment. This material shall be broken to pass a 1-in. [25.0 mm] sieve, thoroughly mixed, and reduced by quartering to provide not less than a 1-lb [0.5 kg] sample for the laboratory.
6.2 Packages—When gypsum is shipped in packages, not less than 1 % of the packages shall be sampled. Samples shall be taken from both the surface and the center of the packages. These samples shall then be broken, mixed, and quartered in accordance with 6.1.
6.3 Laboratory Samples—Each laboratory sample shall be placed immediately in an airtight container and shipped to the laboratory for testing.
7.1 The chemical composition of gypsum shall be deter- mined in accordance with Test Methods C471M.
7.2 The physical properties of gypsum shall be determined in accordance with Test Methods C472.
8. Inspection
8.1 Inspection of the gypsum shall be agreed upon between the purchaser and the supplier as part of the purchase agree- ment.
9. Rejection
9.1 Rejection of gypsum that fails to conform to the requirements of this specification shall be reported to the producer or supplier promptly and in writing. The notice of rejection shall contain a statement documenting how the gypsum has failed to conform to the requirements of this specification.
10.1 When specified in the purchase agreement, a manufac- turer’s or supplier’s report shall be furnished at the time of shipment certifying that the product is in compliance with this specification.
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