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, ASTM C1786, Specification for Segmental Precast Reinforced Concrete Box Sections for Culverts, Storm Drains and Sewers Designed According to AASHTO LRFD.
The American Association of State Highway and Transportation Officials document referenced in the title of ASTM C1786 employs load and resistance factor design methodology using factors developed from current statistical knowledge of loads and structural design.
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 storm water, industrial wastes and sewage. In addition, culverts can also function as pedestrian tunnels as well as wildlife passage areas under heavily travelled highways.
ASTM 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.
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 the 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 standards, visit www.astm.org and search by the standard designation, or contact ASTM Customer Relations (tel +1.877.909.ASTM; email@example.com). ASTM welcomes participation in the development of its standards. Become a member at www.astm.org/JOIN.
Helping our world work better
Over 12,000 ASTM standards operate globally. Defined and set by us, they improve the lives of millions every day. Combined with our innovative business services, they enhance performance and help everyone have confidence in the things they buy and use – from the toy in a child’s hand to the aircraft overhead.
Working across borders, disciplines, and industries we harness the expertise of over 30,000 members to create consensus and improve performance in manufacturing and materials, products and processes, systems and services. Understanding commercial needs and consumer priorities, we touch every part of everyday life: helping our world work better.
For more news in this sector, visit www.astm.org/sn-construction or follow us on Twitter @ASTMBuildings.