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ASTM C478/C478M-22
Standard Specification for Circular Precast Reinforced Concrete Manhole Sections
NORMA vydaná dňa 1.9.2022
Informácie o norme:
Označenie normy: ASTM C478/C478M-22
Dátum vydania normy: 1.9.2022
Kód tovaru: NS-1083896
Počet strán: 10
Približná hmotnosť: 30 g (0.07 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Kategórie - podobné normy:
Anotácia textu normy ASTM C478/C478M-22 :
This specification covers the manufacture and purchase requirements of products used for the assembly and construction of circular vertical precast reinforced concrete manholes and structures used in sewer and water works. Reinforced concrete shall consist of cementitious materials, mineral aggregates, and water, in which steel reinforcement has been embedded in such a manner so that the steel reinforcement and concrete act together. Aggregates shall conform to the specification , except that the requirements for gradation shall not apply. Minimum compressive strength of concrete manhole products covered must meet the requirement. The aggregates shall be sized, graded, proportioned, and mixed with such proportions of cementitious materials and water as will produce as homogeneous concrete mixture of such quality that the products will conform to the test and design requirements. Concrete products shall be subjected to either steam or water curing. Test methods such as compression and absorption testing shall be performed.
Keywords:
absorption, acceptance criteria, base sections, compressive strength, concrete, cone tops, design, flat slab tops, grade rings, ladders, manhole, manufacture, reinforced, riser sections, sewer, steps, tests, water,, ICS Number Code 13.060.30 (Sewage water)
Doplňujúce informácie
| 1. Scope | ||||||||||||||||||||||||
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1.1?This specification covers the manufacture and purchase requirements of products used for the assembly and construction of circular vertical precast reinforced concrete manholes and structures used in sewer, drainage, and water works. 1.2?Part I, Sections 1 11, of this specification presents general requirements and requirements that are common to each precast concrete product covered by this specification. 1.3?Part II of this specification presents specific requirements for each manhole product in the following sections:
Note 1:?Future products will be included in Part II in a
future revision of this specification.
1.4?The values stated in either inch pound or SI units are to be regarded separately as standard. The SI units are shown in brackets. 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 nonconformance with the standard. Note 2:?This specification is a manufacturing and purchase
specification only and does not include requirements for backfill,
or the relationship between field load conditions and the strength
requirements of the manhole products and appurtenances. Experience
has shown, however, that the successful performance of this product
depends upon the proper selection of the product strength, type of
foundation and backfill, and care in the field installation of the
manhole products and connecting pipes. The owner of the project for
which these products are specified herein is cautioned to require
inspection at the construction site.
1.5?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. 1.6?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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