ASTM D6638-18 PDF Download

The ASTM D6638-18 standard is used to determine the connection properties between a layer of geosynthetic reinforcement and segmental concrete block units in the construction of reinforced soil retaining walls. The test is conducted under conditions determined by the user to replicate the connection system at full scale.

This performance test allows for the measurement of connection strength for a segmental unit-geosynthetic connection system under varying normal loads. The relationship between connection strength and normal load can be linear, bilinear, or expressed through a complex mathematical model. The test is carried out using full-scale components and can be conducted in both laboratory and field settings.

By performing a series of tests using this method, designers can define the connection strength for the specific segmental unit-geosynthetic connection system, taking into account the variables in construction procedures and material tolerances common in retaining wall systems. The results of these tests are used for the design of reinforced soil retaining walls utilizing segmental concrete units and geosynthetic reinforcements, such as geotextiles or geogrids.