902.20 Material Inspection for Sec 902

This article establishes procedures for inspecting and reporting those items specified in Sec 0902 for which Materials has responsibility and are not specifically covered in Materials Details of the Specifications.

Apparatus

(a) Magnetic gauge, reading range of 0-40 mils (0-1000 _{$\mu \,$}m).

(b) Rule with suitable graduations to accurately measure the material to be inspected.

Procedure

The highway lighting items normally field inspected by Materials are galvanizing of steel posts and anchor bolts and nuts.

Field determination of weight (mass) of coating is to be made on each lot of material furnished. The magnetic gauge is to be operated and calibrated in accordance with ASTM E376. At least three members of each size and type offered for inspection are to be selected for testing. A single-spot test is to be comprised of at least five readings of the magnetic gauge taken in a small area and those five readings averaged to obtain a single-spot test result. Three such areas should be tested on each of the members being tested. Test each member in the same manner. Average all single-spot test results from all members to obtain the average coating weight (mass) to be reported. The minimum single-spot test result would be the minimum average obtained on any one member. Material may be accepted or rejected for galvanized coating on the basis of magnetic gauge. If a test result fails to comply with the specifications, that lot should be re-sampled at double the original sampling rate. If any of the resample members fail to comply with the specification, that lot is to be rejected. The contractor or supplier is to be given the option of sampling for Laboratory testing, if the magnetic gauge test results are within minus 15 percent of the specified coating weight (mass).

High strength bolts, nuts and washers are checked for AASHTO and ASTM specifications. Destructive testing is done at MoDOT’s Central Lab.

Additional requirements for bolts, nuts and wasters are given in EPG 1080.1.3 Bolts for Highway Lighting, Traffic Signals or Highway Signing.

Report (Records)

Reports shall indicate acceptance, qualified acceptance or rejection. Appropriate remarks as described in EPG 106.20 Reporting are to be included in the report to clarify conditions of acceptance or rejection. Distribution of reports or materials purchased under a MoDOT purchase order is to be as described in EPG 1101 Materials Purchased by a MoDOT Purchase Order.

Tests for weight of coating are to be reported through AASHTOWare. If a sample is submitted to the Central Laboratory for testing, use AASHTOWare.