This memorandum covers galvanized corrugated steel structural plates and fasteners for use in the construction of pipe, pipe arches, arches, underpasses and special shapes for field assembly. Materials shall meet the requirements of Standard Specifications 4144.


Approved sources are listed in the Materials Approved Products Listing Enterprise (MAPLE).



Prior to furnishing material for a project the fabricator shall submit a Certification and Guarantee as provided for in AASHTO M167 to the Office of Construction and Materials.


Material from a fabricator with an approved certification and guarantee may be incorporated in a project provided each shipment is accompanied by either a bill of lading or a separate letter form listing the information and containing a certification of compliance as outlined below The signed mill test reports/certification shall also include a statement indicating the steel meets the requirements of IM 107, Group 2, Buy America.



The producer of galvanized corrugated steel structural plates and fasteners units shall furnish, on each shipment day, a certified bill of materials or invoice which identifies the county, project number, contractor, and number of pieces. The certification of compliance shall be signed by a designated, responsible company representative and shall be stated as follows:


"The materials itemized in this shipment are certified to be in compliance with the applicable AASHTO and/or ASTM requirements and Iowa Department of Transportation Standard Plans and Specifications, IMs and meet the Buy America requirements as described in IM 107 for all steel, iron products and coatings."





Authorized Signature and Date



Each plate shall be identified as follows:


1.     Name of plate fabricator

2.     Identification showing heat number and coating lot number

3.     Specified zinc-coated plate thickness

4.     Specified coating mass - NOTE: Coating shall adhere to the base metal, so that no peeling or flaking occurs during handling and/or shipping.

5.     Identification symbols showing sheet manufacturer and heat number or lot number.

6.     AASHTO M167 Designation.

7.     Use bolts as per Standard Specification 4144.



The District Materials Office shall secure monitor samples from projects. A minimum of one sample should be obtained annually for each fabricator. The sample size shall be 1 foot by 1 foot square obtained from an end section. One set per size of bolts, nuts, and washers shall be obtained at random for testing.



Acceptance will be based on approved producers and fabricators listed in Appendix A.