Standardization News

Precast reinforced concrete box sections are proving to be a versatile means for the development of infrastructure. The use of segmental box sections is now covered in an ASTM standard, C1786, Specification for Segmental Precast Reinforced Concrete Box Sections for Culverts, Storm Drains and Sewers Designed According to AASHTO LRFD.

Made up of separate segments that are assembled in the field to make the final structure, segmental box sections are being used in the building of culverts for the underground conveyance of stormwater, industrial wastes and sewage. In addition, culverts can also function as pedestrian tunnels as well as wildlife passage areas under heavily traveled highways.

C1786 is the first ASTM standard specifically covering precast segmental box culverts. Prior to the development of C1786, producers and engineers would have to refer to ASTM standards for similar structures that did not address specifics regarding the design and manufacture of segmental culverts.

The AASHTO document referenced in the title of C1786 employs load and resistance factor design methodology using factors developed from current statistical knowledge of loads and structural design.

ASTM member Josh Beakley notes that, while the AASHTO LRFD Bridge Design Specifications provide design guidance, small communities and agencies are not always as familiar with the AASHTO requirements as are the state departments of transportation that use them on a more regular basis."

"C1786 incorporates design guidance as referenced in the AASHTO LRFD Bridge Design Specifications, with the production and quality control measures synonymous with an ASTM precast standard, so that practicing engineers can get a good start when considering use of this product," says Beakley.

C1786 was developed by Subcommittee C13.07 on Acceptance Specifications and Precast Concrete Box Sections, which is under the jurisdiction of Committee C13 on Concrete Pipe.

To purchase ASTM standards, visit www.astm.org and search by the standard designation, or contact ASTM Sales (tel +1.877.909.ASTM; sales@astm.org).

CONTACT Technical Information: Josiah W. Beakley, American Concrete Pipe Association • Irving, Texas • tel +1.972.894.2906 | ASTM Staff: Diane Lake • tel +1.610.832.9661