EI 08-020 revised Section 632 Precast Modular Walls, emulating the procedures defined previously in Section 554 for approving a wall system. By adding the Segmental Block Wall Systems to the Precast Modular Wall specification, the list of available externally stabilized fill structures was expanded. EI 08-037 revised Section 554 Internally Stabilized Fill Structures, incorporating retaining wall systems consisting of reinforced fill with a facing.
This current issuance for the revision to Section 554 Fill TYPE_ Retaining Walls, combines like elements (externally and internally fill structures) and establishes a broader Approved List for proprietary fill TYPE_ retaining wall systems based on wall height. Section 554 Fill TYPE_ Retaining Walls is outlined to include Geosynthetically Reinforced Soil Systems (GRSS) and all proprietary fill TYPE_ retaining walls (both internally stabilized fill structures and externally stabilized fill structures).
The Approved List will also identify designers of fill wall systems based on height of wall. Section 554 Fill TYPE_ Retaining Walls will still identify subcategories of walls (i.e. Mechanically Stabilized Earth System, Mechanically Stabilized Wall System, and Prefabricated Wall Systems) to provide requirements for the wall system selected by the Contractor.
