ASTM C478 PDF

ASTM Manhole Specifications technical questions received here at the National Precast Concrete Association, C, “Standard [ ]. Of all the ASTM-related technical questions received here at the National Precast Concrete Association, C, “Standard Specification for. Standard Specification for Precast Reinforced Concrete Manhole Sections. Status: Withdrawn · Replaced by: ASTM C Buy this standard. Price: SEK.

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Many NPCA members produce precast concrete manholes, as these products are used for so many underground applications such as storm and sanitary sewer access, lift stations and utilities. The ASTM C standard contains the requirements for the manufacture and purchase requirements of products used for the assembly and construction of circular, vertical precast concrete manholes and structures.

The scope of C includes structures used in precast sewer, drainage and water works. Committee C13 has been around a long time.

Standard Specification for Precast Reinforced Concrete Manhole Sections

Byeight technical committees had been organized, and in six more were formed. The committee meets once a year, with approximately members attending over three days of technical meetings.

C13 has nine technical subcommittees that maintain jurisdiction over these standards. These standards play a pre-eminent role in all aspects important to the effective standardization of concrete pipe, including material specifications, test methods and installation practices.

The specific scope of C13 is the formulation and review of specifications, methods of test and definitions for concrete pipe, concrete box sections and concrete manhole sections used for constructing sewers, ast, and for factory-made compression and self-energizing joints.

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Development and review of practices and guides cover design, installation, testing, economic evaluation and performance of concrete pipe systems.

ASTM Manhole Specifications

C opened up new manufacturing standards for joint materials as gasket material technology evolved. In addition to the O-ring gasket cross section, the profile-wall gasket cross section was developed see ASTM C listed below. The following specifications apply to manhole connectors and joints:.

ASTM C standards for negative x478 tests for manholes. To improve the testing of manhole section atm, the discussions in C led to the profile wall gasket, a connection with no notch that can be reset in the manhole.

ASTM C – 18 Standard Specification for Circular Precast Reinforced Concrete Manhole Sections

It is more forgiving than other gaskets and is becoming more the norm. While the precast manhole is usually able to withstand additional pressure than that prescribed by ASTMthe gaskets are manufactured to withstand a minimum of only 13 psi according to ASTM C Under the jurisdiction of Subcommittee C The emergence of the Clean Water Act established the basic structure for regulating discharges of pollutants into the waters of the United States and regulating quality standards for surface waters.

Ensuring the separation of human waste from clean drinking water relies on the durability and reliability of underground piping systems. Compliance with ASTM standards protects the integrity of precast concrete pipe systems and the consumer.

Beyond the critical importance of protecting human health and preventing contagious disease, properly designed and produced manholes ensure the safety of workers who handle precast products, and in the long run guarantee quality precast products that comply with accepted industry practices and prevent unnecessary increases in cost to the consumer. Precast specifying engineers and precast producers need to be up to date on ASTM standards, because construction material technology, manufacturing and installation practices, testing techniques, and state and federal regulations are continuously evolving.

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ASTM is at the cutting edge of all of these changes; the balance of the members of its technical committees represents the best practitioners in their respective fields. As a specific example, consider the skyrocketing cost of steel as it relates to precast concrete reinforcement.

The changes made to hoop steel specifications means less steel.

Overdesigning reinforcement translates into an unnecessary increase in manhole manufacturing costs, which in adtm results in increased costs to consumers. ASTM C specifications are minimum requirements for manholes, and engineers can specify additional reinforcement to resist point loading. Your email address will not be published.

A bit of history Committee C13 has been around a long time. ASTM C and joint materials C opened up new manufacturing standards for joint materials as gasket material technology evolved. The following specifications apply to manhole connectors and joints: Understanding and supporting ASTM standards The emergence of the Clean Water Act established the basic structure for regulating discharges of pollutants into the waters of the United States and regulating quality standards for surface waters.

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