พลาสติก
เอกสารมาตรฐาน
สหรัฐอเมริกา
AASHTO
M 252-21
Corrugated Polyethylene Drainage Pipe
2021
9
HM42-2022 part 1
This specification covers the requirements and methods of test for corrugated polyethylene (PE) pipe, couplings, and fittings for use in subsurface drainage systems, storm sewers, and in surface drainage (culverts), where soil support is given to the pipe’s flexible walls in all applications.