FP-96 English Version - Eastern Federal Lands Highway Division

Section 720.) STRUCTURAL WALL ANDSTABILIZED EMBANKMENT MATERIAL720.01 Mechanically Stabilized Earth Wall Material.(a) Concrete face panels. Conform to Section 552 and the following:(1) Use portland cement concrete class A(AE) with a minimum 4,000-pounds per square inch, 28-day compressive strength.(2) Conform to Subsection 562.11 and fully support the units until theconcrete reaches a minimum compressive strength of 1,000 pounds persquare inch. The units may be shipped and/or installed after the concretereaches a minimum compressive strength of 3,400 pounds per squareinch.(3) Finish the front face of the panel with a class 1 finish according toSubsection 552.16. Screed the rear face of the panel to eliminate openpockets of aggregate and surface distortions in excess of 0.25 inches.Cast the panels on a flat area. Do not attach galvanized connecting devicesor fasteners to the face panel reinforcement steel.(4) Clearly scribe on an unexposed face of each panel the date of manufacture,the production lot number, and the piece mark.(5) Handle, store, and ship all units in such a manner as to eliminate thedangers of chipping, discoloration, cracks, fractures, and excessive bendingstresses. Support panels in storage on firm blocking to protect thepanel connection devices and the exposed exterior finish.(6) Manufacture all units within the following tolerances:(a) Panel dimensions. Position of panel connection devices within 1inch. All other dimensions within 0.188 inches.(b) Panel squareness. Squareness, as determined by the differencebetween the 2 diagonals, shall not exceed 0.50 inches.(c) Panel surface finish. Surface defects on smooth formed surfaces5 feet or more in length shall not exceed 0.125 inches. Surface defectson textured-finished surfaces 5 feet or more in length shall not exceed0.31 inches.763