AASHTO M 178M/M 178-20 PDF Download

The AASHTO M 178M/M 178-20 standard specifically addresses concrete drain tile with internal diameters ranging from 100 mm (4 in.) to 900 mm (36 in.). This standard is intended to be used for both surface and subsurface drainage purposes.

It is important to note that this specification focuses solely on the manufacturing and purchase aspects of concrete drain tile. It does not include requirements for factors such as bedding, backfill, or the correlation between field load conditions and the strength classification of the drain tile. These aspects may need to be considered separately when implementing the drain tile in a specific project.

The AASHTO M 178M/M 178-20 standard aligns with ASTM C 412M-05a and C 412-05a, with the exception that the absorption test is limited to the 5-hour boil method. Additionally, manufacturers are not provided with the option to supply drain tile in inch-pound sizes if the order is placed in SI units. This highlights the need for adherence to the specified measurement units as outlined in the standard.