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ASTM C90-21
Standard Specification for Loadbearing Concrete Masonry Units
NORMA vydaná dňa 1.12.2021
Informácie o norme:
Označenie normy: ASTM C90-21
Poznámka: NEPLATNÁ
Dátum vydania normy: 1.12.2021
Kód tovaru: NS-1044037
Počet strán: 5
Približná hmotnosť: 15 g (0.03 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Kategórie - podobné normy:
Anotácia textu normy ASTM C90-21 :
Keywords:
absorption, compressive strength, concrete masonry units, equivalent web thickness, face shell, flange, lightweight, linear drying shrinkage, loadbearing, medium weight, normal weight, webs,, ICS Number Code 91.100.30 (Concrete and concrete products)
Doplňujúce informácie
| 1. Scope | ||||||||||||||||||||||||||||||
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1.1?This specification covers hollow and solid (see 5.3 and 5.4) concrete masonry units made from hydraulic cement, water, and mineral aggregates with or without the inclusion of other materials. There are three classes of concrete masonry units: Normal Weight, Medium Weight, and Lightweight. These units are suitable for both loadbearing and nonloadbearing applications. 1.2?Concrete masonry units covered by this specification are made from lightweight or normal weight aggregates, or both. Note 1:?The requirements of this specification have been
researched, evaluated, and established for over a century,
resulting in the physical properties and attributes defined here.
These requirements are uniquely and solely applicable to concrete
masonry units manufactured on equipment using low or zero slump
concrete and the constituent materials defined herein. Many
performance attributes of concrete masonry units are indirectly
accounted for, or inherently reflected within, the requirements of
this specification without direct measurement, assessment, or
evaluation. Applying the requirements of this specification to
products that may be similar in appearance, use, or nature to those
covered by this specification may not address all pertinent
physical properties necessary to ensure performance or
serviceability of the resulting construction in real-world
applications under typical exposure environments. Products
manufactured using alternative materials, manufacturing methods, or
curing processes not covered by this specification should not be
evaluated solely using the requirements in this specification;
however, developers of new products can consider the property
requirements of this specification as a beginning benchmark for
unit performance. It is reasonable to test new products for system
performance as well as unit performance.
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 standard. 1.4?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. Note 2:?When particular features are desired such as surface
textures for appearance or bond, finish, color, or particular
properties such as density classification, higher compressive
strength, fire resistance, thermal performance or acoustical
performance, these features should be specified separately by the
purchaser. Suppliers should be consulted as to the availability of
units having the desired features.
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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