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Standard Specification for Lightweight Aggregate for Internal Curing of Concrete
Přeložit název
NORMA vydána dne 15.6.2017
Označení normy: ASTM C1761/C1761M-17
Poznámka: NEPLATNÁ
Datum vydání normy: 15.6.2017
Kód zboží: NS-688947
Počet stran: 8
Přibližná hmotnost: 24 g (0.05 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Keywords:
absorption, desorption, internal curing, lightweight aggregate, relative density, wetted surface dry,, ICS Number Code 91.100.30 (Concrete and concrete products)
1. Scope | ||||||||||||||||||||||||||||||||
1.1 This specification covers lightweight aggregate intended to provide water for internal curing of concrete. It includes test methods for determining the absorption and desorption properties of lightweight aggregate. Note 1: Internal curing provides an additional source of water
to sustain hydration and substantially reduce the early-age
autogenous shrinkage and self-desiccation that can be significant
contributors to early-age cracking. Appendix X1 provides guidance on
calculating the quantity of lightweight aggregate for internal
curing.
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance. Some values have only SI units because the inch-pound equivalents are not used in practice. Note 2: Sieve size is identified by its standard designation
in Specification E11. The
alternative designation given in parentheses is for information
only and does not represent a different standard sieve
size.
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 standard. 1.4 This specification 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. 1.5 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. |
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2. Referenced Documents | ||||||||||||||||||||||||||||||||
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