1040.5 Laboratory Testing Guidelines for Sec 1040

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This article establishes procedures for Laboratory testing, reporting and accepting samples of guardrail, guard cable and plastic blocks. Refer to Sec 1040 for MoDOT's specifications.


1040.5.1 Procedure

Laboratory tests to be performed on the sample are designated by the inspector in the remarks area of SiteManager (SM).

1040.5.1.1 Chemical Tests

Procedure for determining the mass of coating shall be according to AASHTO T65. This method shall be used in all cases where the area of the test specimen can be accurately calculated. On specimens shaped so that the area cannot be calculated, the mass of coating shall be determined with a magnetic gauge in accordance with ASTM E376. Reference should also be made to Field determination of weight (mass) of coating for additional information on the proper use of the magnetic gauge. Original test data and calculations shall be recorded in Laboratory workbooks. Test results shall then be recorded through SM.

1040.5.1.2 Physical Tests

Physical characteristics shall be measured and test results and calculations shall be recorded through SM.

Dimensions of sheet items are to be measured in the Laboratory for conformance to Standard Plan 606.00. Mechanical properties of beams shall be tested in accordance with ASTM A525. Mechanical properties do not apply to end sections and back-up plates. Thickness of sheet items shall be measured to the nearest 0.0001 in. (.00254 mm) and reported to the nearest 0.001 in.(.0254 mm) and shall be taken on the tangent portion of the cross section at least 3/8 in. (9.5 mm) from the edge of the metal across the end of the sheet item.

Mechanical testing of bolts and nuts shall be performed according to EPG 712.3.2.2 Physical Tests - Bolts and Nuts. Dimensions of bolts, nuts, and washers shall be checked for conformance to Standard Drawing 606.00.

Dimensions, fabrication, and mechanical properties of 1/2 in. (12.5 mm) cable shall conform to ASTM A475.

Nominal dimensions of plastic blocks are to be measured in the Laboratory for conformance to Standard Plan 606.00. Visual determination should be made of the block to determine compliance for fabrication. If the block meets the requirements for dimensions and visual inspection, void size and spacing should be determined and reported. Dimensions, void spacing and void size should be measured and reported to the nearest 1/16 in. (2 mm).

1040.5.2 Sample Record

The sample record shall be completed in SM, as described in Sample Record General Information , and shall indicate acceptance, qualified acceptance, or rejection. Appropriate remarks, as described in EPG 106.20 Reporting, are to be included in the remarks to clarify conditions of acceptance or rejection. Test results shall be reported on the appropriate templates under the Tests tab.

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