Category:1080 Structural Steel Fabrication
| MGS Information |
| Current General Services Specifications (MGS) By Subject |
Refer to Sec 1080 for MoDOT’s specifications.
Contents
1080.1 High Strength Bolts
| Videos Showing Strain Testing to Determine Yield Strength | |
| Truss Chord Member for bridge in Knox Co. | PT Bar for Mississippi River bridge in City of St. Louis |
All bolts, nuts, and washers should be from a PAL supplier in accordance with Pre-Acceptance Lists (PAL). If a supplier proposes to furnish structural steel connectors and is not on PAL, a request is to be made to the Construction and Material Division for acceptance into the PAL program. Once satisfactory submittals have been received, the supplier will be placed on the PAL. Bolts, nuts, and washers, for use other than bridge construction and in quantities less than 50, may be accepted from a PAL supplier without a PAL identification number.
Construction inspection requirements for bolts, nuts and washers are given in EPG 712.1.5 High Strength Bolts And Washers. Materials inspection requirements are given in EPG 712.2.4.1 High Strength Bolts and Lab testing requirements in EPG 712.3.2 Procedure.
1080.1.1 Samples Taken at PAL Manufacturer Facilities
Prior to visiting a PAL supplier or manufacturer facility, the Cognos report “PAL Shipments Within Date Range” should be run for the facility to determine what material has been given MoDOT PAL numbers. For each PAL material, the sample shall consist of six pieces rather than determined from lot quantities as given in EPG 1080.1.2 Sample Sizes. An individual sample shall consist of bolts, nuts, or washers as these are treated as different materials in the PAL system.
1080.1.2 Sample sizes
1080.1.2.1 ASTM A307 Bolts
Samples for Laboratory testing are only required when requested by the State Construction and Materials Engineer, or when field inspection indicates questionable compliance. When samples are taken, they are to be taken as shown in the following table. When galvanized bolts, nuts and washers are submitted to the Laboratory, a minimum of 3 samples of each are required for Laboratory testing.
| 3 for lots of 0 to 800 pcs. | Each sample is to consist of one bolt, nut and washer. Submit for dimensions, weight (mass) of coating, mechanical properties. |
| 6 for lots of 801 to 8,000 pcs. | |
| 9 for lots of 8,001 to 22,000 pcs. | |
| 15 for lots of 22,001+ pcs. |
1080.1.2.2 ASTM A325 Bolts
Samples for Laboratory testing shall be taken and submitted as follows: All lots containing 501 or more high strength bolts shall be sampled and submitted to the Laboratory for testing. If no lot offered contains 501 or more bolts, sample 10 percent of the lots offered, or one lot, whichever is greater. A lot is defined as all bolts of the same size and length, with the same manufacturer's lot identification, offered for inspection at one time. Samples shall be taken as follows:
| Number of Bolts in the Lot | Number of Bolts Taken for a Sample* |
|---|---|
| 150 and less | 3 |
| 151 through 800 | 3 |
| 801 through 8,000 | 6 |
| 8,001 through 22,000 | 9 |
| 22,001 plus | 15 |
| * A minimum of 3 samples will be required for galvanized materials. | |
All lots containing 501 or more high strength nuts shall be sampled and submitted to the Laboratory for testing. If no lot offered contains 501 or more nuts, sample 10 percent of the lots offered or one lot, whichever is greater. A lot is defined as all nuts of the same grade, size, style, thread series and class, and surface finish, with the same manufacturer's lot identification, offered for inspection at one time. Samples shall be taken as follows:
| Number of Nuts in the Lot | Number of Nuts Taken for a Sample* |
|---|---|
| 800 and under | 1 |
| 801 through 8,000 | 2 |
| 8,001 through 22,000 | 3 |
| 22,000 and over | 5 |
| * A minimum of 3 samples will be required for galvanized materials. | |
All lots containing 501 or more high strength washers shall be sampled and submitted to the Laboratory for testing. If no lot offered contains 501 or more washers, sample 10 percent of the lots offered, or one lot, whichever is greater. A lot is defined as all washers of the same type, grade, size and surface finish, with the same manufacturer's lot identification, offered for inspection at one time. Samples shall be taken as follows:
| Number of Washers in the Lot | Number of Washers Taken for a Sample* |
|---|---|
| 800 and under | 1 |
| 801 through 8,000 | 2 |
| 8,001 through 22,000 | 3 |
| 22,000 and over | 5 |
| * A minimum of 3 samples will be required for galvanized materials. | |
1080.1.3 Bolts for Highway Lighting, Traffic Signals or Highway Signing
Bolts, nuts, and washers for highway lighting, traffic signals, or highway signing shall meet the requirements given in EPG 712.2.4.1 High Strength Bolts, except that mechanical galvanization of bolts, nuts and washers for highway lighting or traffic signals shall meet requirements of ASTM B695, Class 55. Field determination of weight (mass) of zinc coating, when specified, is to be determined by magnetic gauge in the same manner as described EPG 901.17 Material Inspection for Sec 901 except that a smaller number of single-spot tests will be sufficient. Samples for Central Laboratory testing are only required when requested by the State Construction and Materials Engineer or when field inspection indicates questionable compliance. When samples are taken, they are to be taken at the frequency and of the size shown in Table 1040.2.1.2 Sampling Requirements.
Bolts, nuts, and washers for traffic signals shall also be inspected for conformance with Section 902.4. Additionally for traffic signals, anchor bolts and nuts or high strength bolts and nuts, except those meeting requirements of ASTM A325, shall be accompanied by a test report certified to be representative of the mechanical tests for each size in each shipment.
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