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ASTM C897-15(R2020) pdf free download

ASTM C897-15(R2020) pdf free download.Standard Specification for Aggregate for Job-Mixed Portland Cement-Based Plasters
1. Scope
1.1 This specification covers natural or manufactured aggre- gate for use in job-mixed base and finish-coat full thickness portland cement-based plasters. 1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.3 The text of this specification references notes and footnotes that 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.
5. Physical Properties
5.1 Soundness (see 7.1.7): 5.1.1 Except as herein provided, aggregate subjected to five cycles ofthe soundness test shall show a loss, when weighed in accordance with the grading of a sampling complying with the limitations set forth in Section 6, not greater than 20 % when sodium sulfate is used, or 15 % when magnesium sulfate is used. 5.1.2 Aggregates failing to meet the requirements of 5.1.1 shall be accepted, provided there is evidence that plasters of comparable properties made from similar aggregates from the same source has been exposed to weathering, similar to that to be encountered, for a period of more than five years without appreciable disintegration.
6. Dimensions, Mass, and Permissible Variations
6.1 Aggregate for Base Coat—Aggregate for use in base coat portland cement-based plasters shall be graded as follows:6.1.1 Not more than 50 % shall be retained between any two consecutive sieves shown in the above table, nor more than 25 % between No. 50 (300 µm) and No. 100 (150 µm) sieves. The amount ofmaterial finer than a No. 200 (75 µm) sieve shall not exceed 3 %. 6.1.2 The fineness modulus shall fall between 2.05 and 3.05. If the fineness modulus varies by more than 0.25 from the value assumed in selecting proportions for the plaster, the aggregate shall be rejected unless adjustments are made in proportions to compensate for change in grading. N OTE 1—The gradation of aggregate used in portland cement-based plaster affects the workability, shrinkage characteristic porosity, and durability of the plaster. 6.1.3 Aggregate failing to meet only the gradation limits of this specification shall be permitted to be used, provided the supplier furnishes satisfactory documentation to the specifier that the plaster made with the aggregate has an acceptable demonstrated performance record. 6.2 Aggregate for Finish Coat Plaster—Aggregate for finish coat plaster shall all pass the No. 8 (2.36 mm) sieve and meet the remaining gradation requirements of 6.1, except where special texture finishes require gradation of aggregate outside of these limits. 6.2.1 When special texture finishes require gradation of the aggregate outside of the limits of 6.1, sample panels shall be required and evaluated in accordance with criteria defined in the purchase agreement. N OTE 2—Special texture finishes may require modification of the plaster formulation and application to compensate for the effect of aggregate gradation.
7. Sampling and Testing
7.1 The aggregate shall be sampled and tested as specified in the following methods, except as otherwise specified in this specification: 7.1.1 Sampling, Practice D75/D75M. 7.1.2 Fineness Modulus, Terminology C125, is obtained by adding the total percentages shown by the sieve analysis to be retained on each of the sieves in 6.1, except the No. 200 (75 µm) sieve, and dividing the sum by 100. 7.1.3 Materials Finer than No. 200 (75 µm) Sieve, Test Method C117 by washing. 7.1.4 Friable Particles, Test Method C142/C142M. 7.1.5 Light Constituents, Test Method C123/C123M. 7.1.6 Organic Impurities, Test Method C40/C40M. 7.1.7 Soundness, Test Method C88/C88M. 7.1.8 Sieve Analysis, Test Method C136.

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