These Recommendations have been prepared to provide guidance in the application of permanent and temporary prestressed rock and soil anchors utilizing high strength prestressing steel. They represent the current state of practice and provide practical guidance for the design, installation and testing of grouted prestressed rock and soil anchors, but are not necessarily applicable to other anchor systems such as those, which rely only on mechanical anchorage to the ground. These Recommendations also do not intend to establish any requirements for soil nails, including the ones for protection against corrosion.

Due to the broad nature of these Recommendations, particular sections should be clearly referenced, when included in the specifications for a specific project.

These Recommendations contain major technical revisions and supersede the 1996 Edition. The major revisions include modified requirements for:

• Protection against corrosion

• Grouts and grouting activities

• The use of epoxy-coated strand

Section 3 and 9 of the 1996 Recommendations were combined into an enlarged Section 3. Additionally, numerous changes were made for further enhancing the understanding of the anchor technology.

A summary and the titles of the standard specifications, as well as of the references cited throughout this document can be found in Section 9.

The values stated in either SI units or imperial units are to be regarded as standard. Within the text, the imperial units are shown in brackets. The values stated in each system are not exact equivalents, and so each system must be used independently of the other.

These Recommendations were prepared by the PTI Committee for Prestressed Rock and Soil Anchors with input and review by the ADSC Anchored Earth Retention Committee.