FIELD MANUAL For HOT MIX ASPHALT (HMA) - Mississippi ...

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Deliver or have the Contractor deliver the samples required in MT-78 to the Central Laboratory. 4.3.1.3 Central Laboratory. Check the Contractor’s job mix formula for accuracy and conformance to design characteristics required in the specifications for the required HMA mixture. Check to see if each coarse aggregate component is from an approved source. If not, check for sample(s) from the District Materials Laboratory for source approval. Test the sample(s) in accordance with AASHTO T 19, T 96 and T 104, and determine conformance to Section 703 of the Standard Specifications. Test Contractor samples submitted with the job mix formula, in accordance with current MDOT policy. If all test results are found to be in conformance with the specification requirements, issue the verified job-mix formula on Form TMD-042 by cover letter. If the mixture is found not to be in conformance with the specification requirements, reject the job mix formula with an explanation of the reasons for the rejection in writing. 4.3.2 Job Mix Formula Transfers. 4.3.2.1 Project Engineer. Determine if the original job mix formula complies with the bid items in the contract for which the transfer is to be made. If the request does not conform to the mixture type set out in the bid items, reject the request and return to the Contractor by cover letter explaining the reason for rejection. If the Contractor’s request is in conformance with the bid items, forward the request to the District Materials Engineer.. 4.3.2.2 District Materials Laboratory. Verification of the Contractor’s request for transfer of a job mix formula from one project to another will be based on the Contractor’s documentation, and such additional testing and investigation that may be necessary. Verify that the source and characteristics of the materials have not changed since the original job mix formula was issued. Perform any additional testing and investigation that may be necessary for verification. If it is determined that there has been a change in the source of any component material(s) or there has been a change in any characteristics of the material(s) or mixture, reject the Contractor’s request in writing giving the reasons for rejection. When the investigation confirms that the source and characteristics of materials has not changed, the requested transfer may be made. The District Materials Engineer must submit a written request for the transfer to the State Materials Engineer. This Rev. February 5, 2007 18
equest must certify to the conditions set out in Subsection 4.2.2 of this manual for verification of job mix formula transfers. 4.3.2.3 Central Laboratory. Upon receipt of the District Materials Engineer’s request, check all documentation for conformance to specified requirements for verification of job mix formulas as set out in Subsection 4.2.2 of this manual. If the request meets the specified criteria, issue the verified job mix formula on Form TMD-042 and make distribution by cover letter. NOTE: All JMF transfers are once again tentative until production and compaction requirements for the new project are met. 4.3.3 Adjustments To Job mix Formula. 4.3.3.1 Project Office and District Materials Laboratory. Upon receipt of the Contractor’s request and documentation for adjusting the job mix formula, check to see if sufficient quantity of material has been processed through the plant, placed on the roadway, compacted, and tested in order to determine if adjustments are necessary (minimum of four QC production tests). From the Contractor’s documentation, determine if density, VMA, air voids, asphalt content, and other required design characteristics have been established by quality control test results and quality assurance test results. Determine if current production values meet the mixture design requirements. Determine if the requested adjustments to aggregate gradation and/or asphalt binder content are within the specified tolerances. (Note- The asphalt binder content can only be reduced if the production VMA meets or exceeds the minimum design VMA requirements for the mixture being produced.) If in agreement with the Contractor’s request, the District Materials Engineer shall submit a written request to the State Materials Engineer for a revised job mix formula with the Contractor’s request and all documentation attached. If not in agreement, reject the request and provide reasons for rejection in writing. 4.3.3.2 Central Laboratory. Review the request, and if warranted by the documentation, issue a revised job mix formula on Form TMD-042. Make distribution of the revised job mix formula by cover letter. Rev. February 5, 2007 19
Page 1 and 2: MISSISSIPPI DEPARTMENT OF TRANSPORT
Page 3 and 4: TABLE OF CONTENTS (Cont’d.) Page
Page 5 and 6: APPENDIX 1: MISSISSIPPI TEST METHOD
Page 7 and 8: FHWA - Federal Highway Administrati
Page 9 and 10: AASHTO Standards (Cont’d.) AASHTO
Page 11 and 12: CHAPTER 2 PERSONNEL REQUIREMENTS 2.
Page 13 and 14: Check sieves for conformance to AAS
Page 15 and 16: equest for transfer of the verified
Page 17: discussed a possible change for the
Page 21 and 22: Asphalt binder from the asphalt wor
Page 23 and 24: EXAMPLE Anticipated Tonnage For The
Page 25 and 26: A B State Contractor 40+ kg C Contr
Page 27 and 28: 5.4 Compaction of SHRP Gyratory Spe
Page 29 and 30: 5.5.4 On the first day of productio
Page 31 and 32: Where: A = Dry Mass of Test Specime
Page 33 and 34: 5.6.1.9 On the first day of product
Page 35 and 36: 5.9 Calculating Voids In Mineral Ag
Page 37 and 38: The specified JMF limits and warnin
Page 39 and 40: that the asphalt pump malfunctioned
Page 41 and 42: CHAPTER 6 MDOT QUALITY ASSURANCE PR
Page 43 and 44: verification test results fail to m
Page 45 and 46: Arrange to have a verification samp
Page 47 and 48: and resolve deficiencies noted on t
Page 49 and 50: mixture (401.02.6.3). 6.6 Guideline
Page 51 and 52: Result F Check complete. Use QA Spl
Page 53 and 54: In Step 3, the question “Is the d
Page 55 and 56: 6.6.1.2 Example 2. Basic Data - The
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Page 59 and 60: 7.4.3 Nuclear Density Testing 1. Se
Page 61 and 62: The acceptable range of individual
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Page 65 and 66: Allowable Gauge Bias Deviation (Tab
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Re-Evaluating a Corrected Lot (Two
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Rev. 6/01/05 Mississippi Department
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Excerpt from Materials Division Ins
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Materials Division Inspection, Test
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Approved by: D.B. McCaa S.O.P. No.:
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APPENDIX 2 FORMS Rev. February 5, 2
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TMD-005 QMP HOT-MIX ASPHALT Q.A. Mi
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TMD-008 MISSISSIPPI DEPARTMENT OF T
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TMD-042 MISSISSIPPI DEPARTMENT OF T
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Page 1 of 2 MISSISSIPPI DEPARTMENT
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Page 1 of 2 MISSISSIPPI DEPARTMENT
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APPENDIX 3 EXAMPLE PROBLEMS Rev. Fe
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7 Example No. 1 Air Voids 6.5 6 5.5
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Example No. 2 7 Air Voids 6.5 6 5.5
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