Laboratory, Personnel, and Correlation
114.1General
1 Technicians employed by an AASHTO-accredited laboratory and performing tests in that facility do not require certification. Obtain field samples using certified technicians.
114.2Mix Design
114.2.1 Laboratory
1 Laboratories performing mix designs must obtain and maintain AASHTO accreditation for all tests and procedures pertaining to mixes used in the project . Laboratories not having the required accreditations can submit mix designs if those tests and procedures are performed by another facility having the appropriate accreditation. Include with the mix design submittal appropriate documentation verifying required accreditations.
114.2.2 Correlation of Laboratory Test Results
1 Implement the following procedures to control equipment or procedural bias.
available on request.
compare contractor and department mix design results using the precision statements in accordance with the Materials Testing Manual.
limits of the prec ision statements, the department will use the contractor’s mix design to approve the job mix formula, establish the target asphalt content, and establish the voidless unit weight for density control.
the precision statements, the department will begin resolving the discrepancy in accordance with Subsection 114.2.3, Resolving Test Discrepancies . Until the source of discrepancy is identified and the problem is resolved, the res ults of mix design performed by the Materials Program may, at the discretion of the engineer, be used to approve the job mix formula, establish the target asphalt content, and establish the voidless unit weight for density control.
Laboratory Personnel, and Correlation SECTION 114
114.2.3 Resolving Test Discrepancies
1 To identify the source of discrepancy between test results, the contractor and the department will proceed as follows:
laboratory and the Materials Program will review testing procedures, equipment, and other applicable information. If the parties reach mutual agreement, the Materials Program will record the resolution in writing and document the results in the project file.
party laboratory . Results of third party testing will determine which laboratory bears responsibility for the discrepancy.
contractor’s results are confirmed. The department will not pay the cost if the department’s results are confirmed.
114.3Field Testing Laboratory and Personnel Requirements
114.3.1 General
1 Provide quality control supervisor as point -of-contact for all parties for quality control and quality acceptance issues . At minimum, the supervisor has the authority to coordinate activities for the mix design, quality control, and quality acceptance testing; to review and interpret test reports; make recommendations for control process, including mix properties.
2 When testing is required, ensure the presence at the production site of a certified technician during production of aggregate, plant mix pavement, or concrete placements.
3 All test results must be signed by a certified technician.
4 Ensure testing personnel use the testing procedures as outlined in Materials Testing Manual.
114.3.2 Personnel
1 Only certified technicians can perform sampling and testing of materials in the field. A certified technician must have a current certification from the Wyoming Materials Technician Certification Program in accordance with Table 114.3.2- 1, Testing Certification Requirements.
Laboratory Personnel, and Correlation SECTION 114
Table 114.3.2-1 Testing Certification Requirements Tests Minimum Certification Aggregate gradation Aggregate Coarse Aggregate Angularity Aggregate Fine Aggregate Angularity Aggregate Liquid Limit Aggregate Plastic Limit Aggregate Sand Equivalent Aggregate In-Place Density Asphalt Mix Verification Sampling Asphalt and Aggregate Asphalt Content Asphalt Field Sampling Fresh Concrete Concrete Temperature of Fresh Concrete Concrete Unit Weight (Density) of Concrete Concrete Slump Concrete Air Content of Fresh Concrete Concrete Making, Curing Concrete Cylinders Concrete
114.3.3 Correlation
114.3.3.1 General
1 For aggregate and density tests, ensure results are free from equipment and procedural bias by using correlation testing performed by technicians responsible for quality acceptance and verification tests.
2 Before performing correlation testing, conduct a meeting between the quality control supervisor, and other personnel responsible for quality acceptance and verification testing. Address following topics:
analysis, core drying, soaking times, etc.); and
3 Document the meeting discussions and outcomes, obtain signatures of all attendees, and submit to the engineer; the engineer will keep documentation in the project file.
Laboratory Personnel, and Correlation SECTION 114
4 The department will use statistical evaluation procedures in accordance with the Materials Testing Manual to decide if both groups of samples represent the same sample population. If the statistical evaluation procedures indicate that the samples from the contractor’s and department’s testing represent the same sample population, qualit y acceptance testing may begin and referee samples discarded.
5 If samples from the contractor’s and department’s testing do not represent the same sample population, the department will begin resolving the discrepancy in accordance with Subsection 114.3.4, Resolving Field Test Discrepancies.
6 Perform additional correlation tests if the correlation procedure shows that directional bias is present. Continue performing correlation testing until the directional bias no longer exists in accordance with Subsection 114.3.4, Resolving Field Test Discrepancies . The department’s test results will be used for pay factor analysis while correlation testing is being done. Perform new correlation tests if new equipment or personnel (department or contractor) are introduced during testing.
114.3.3.2 Aggregate Gradation
1 Before performing correlation testing for aggregate gradation and starting production, split at least one sample and perform gradation tests to obtain preliminary indication of equipment or directional bias.
2 Correlate aggregate test results in accordance with the Materials Testing Manual using samples taken during the first production lot . If combined samples of aggregate can be obtained during crushing, perform correlation at that time. Use the following procedures to correlate results of the contractor’s and department’s aggregate testing:
device by the contractor in the presence of engineer represent one test set.
of the department.
independent of the contractor.
completed.
Laboratory Personnel, and Correlation SECTION 114
114.3.3.3 Density
1 Correlate results from the contractor’s and department’s density tests during placement of test strip. Use the following procedures:
numbers with exclusion of locations within 12 in [300 mm] of the pavement edge.
engineer.
using a nondestructive method.
and density; do so independent of the department.
independent of the contractor.
have been completed.
114.3.4 Resolving Field Testing Discrepancies
1 Resolve discrepancies as follows:
condition, and equipment calibrations in attempt to solve the problem.
correlation procedure.
results represent different sample populations, conduct referee testing.
samples for aggregate gradations and the department’s cores for density testing.
receiving the samples.
correlating with the Materials Program test results for the quality acceptance calculations.
E arthwork
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