AASHTO T 221-90 (2017) PDF Download

AASHTO T 221-90 (2017) is a standard method of test that describes the procedure for conducting repetitive static plate load tests on subgrade soils and compacted pavement components. This test is applicable to both compacted materials and natural soils, and is primarily used to gather data for evaluating and designing airport and highway pavements, both rigid and flexible in nature.

The purpose of this standard is to provide a consistent and reliable methodology for conducting these tests, ensuring that the results obtained can be effectively utilized in the pavement evaluation and design process. It should be noted that this test method is technically equivalent to ASTM D 1195/D 1195M-09, which is a similar standard developed by the American Society for Testing and Materials (ASTM).

By following the procedures outlined in AASHTO T 221-90, engineers and technicians can accurately assess the load-bearing capacity of soil and pavement materials, thus enabling them to make informed decisions regarding pavement design and construction. The repetitive nature of the test allows for variability to be accounted for and ensures that reliable data can be obtained for analysis.