For a period in the early 80s, the FHWA specification for MSE walls allowed up to 25% fines, and many structures were constructed in the United States with these finer materials.

• 在80年代早期，联邦公路局对加筋土墙的规范中，细料含量最多允许到25%25，美国大量的结构是根据此规范来建造的。