1.1 This specification covers wet-cast precast modular block (PMB) retaining wall units cast from first-purpose, non-reconstituted concrete with or without the inclusion of steel reinforcement. The PMB units covered by this specification are machine-placed block units intended for use in the construction of dry stacked modular retaining wall systems. 1.2 The text of this standard 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. 1.3 Units-The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text of the specification, the SI units are shown in brackets. The values stated in each system are not exact equivalents. Therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the standard. 1.4 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 and health practices and determine the applicability of regulatory limitations prior to use.
Wet-cast precast modular block retaining wall units have been used as earth-retaining wall solutions since 2000. Currently, there are more than ten private companies based in North America that are actively engaged in licensing proprietary precast modular block retaining wall technology to producers within the precast concrete industry. These efforts have created regional, national, and, in many cases, international manufacturing and distribution networks for various proprietary versions of this construction technology. Given the acceptance of the construction industry of this technology and its continued rapid growth, an ASTM specification covering fundamental quality control and quality assurance methods for this product group is both needed and appropriate. Users of the standard will include precast block producers and distributors, design professionals, construction professionals, government agencies, and commercial and residential property owners.
Keywordsconcrete block; gravity retaining wall; gravity wall block; large block retaining wall; modular block retaining wall; modular concrete block; MSE wall; PMB; precast concrete; retaining wall block
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top