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

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CHAPTER 4 JOB-MIX FORMULA 4.1 General. The Contractor is responsible for the design of each job mix formula used on the project and for any necessary adjustments during production. A job mix formula may be a new design, or one being transferred from a previous project for which it was developed and under the conditions set out in the specifications. The Contractor shall not place any mixture prior to receiving a “tentative” approval for the job mix formula and a MDOT design number from the Central Laboratory. MDOT is responsible for the verification of each job mix formula submitted by the Contractor for use on the project. 4.2 Contractor Responsibilities. 4.2.1 Original Design of Job Mix Formula. Design the job mix formula in accordance with MT-78. At least 10 working days prior to the proposed use of each mixture, submit in writing to the Engineer (with a copy to the District Materials Laboratory) the proposed job mix formula signed by a CMDT Technician. Prepare samples of the materials representative of the job mix formula for submission to MDOT’s Central Laboratory in accordance with MT-78. 4.2.2 Job Mix Formula Transfers. A verified job mix formula may be transferred from one project to another under the following conditions: If the mixture is currently being produced on the project from which it is being transferred, check the quality control test results and the quality assurance test results to verify consistent performance to the job mix tolerances. If the test results show satisfactory performance, the job mix formula may be transferred. A summary of the results on MDOT Forms TMD-006 and TMD-008 shall be provided along with information on which projects the job mix formula had previously been used. If the mixture is not currently being produced on an active project or has not been produced within the past six months, run the bulk specific gravity test on each aggregate component. If the specific gravity of each individual aggregate component is within a tolerance of ±0.025 from the original job mix formula, the combined bulk specific gravity of the aggregate blend is within a tolerance of ±0.015 from the original job mix formula, and the mixture properties meet the design requirements when calculated with the new aggregate specific gravity results, the job mix formula may be transferred. At least 10 working days prior to the proposed use of each mixture, submit in writing to the Engineer (with a copy to the District Materials Laboratory) a Rev. February 5, 2007 14
equest for transfer of the verified job mix formula signed by the Contractor’s CMDT Technician. The written request must certify that the source and characteristics of the materials have not changed since the original job mix formula was issued. Include all required supporting documentation with the request. Original Job Mix Formulas that have been revised in the field during production as set out below in Subsection 4.2.3 of this manual shall not be transferred to another project. Only the revised JMF will be considered for transfer. 4.2.3 Adjustments To Job Mix Formula. When necessary, minor adjustments may be made to a job mix formula under the conditions set out in Subsection 401.02.5.7 of the contract specifications and as follows: Each job mix formula proposed and verified from laboratory tests is considered tentative until a sufficient quantity of mixture has been processed through the plant, placed on the roadway, compacted to required density, and tested to determine if any corrections or adjustments are needed. Determine what adjustments, if any, are necessary from the quality control test results and the quality assurance test results for density, VMA, air voids, asphalt content, aggregate gradation, and other required design characteristics. Check the specifications to determine the amount of RAP allowed in the mixture is not exceeded. This amount may be a function of mixture type and location in the structure (i.e.,. top lift). Check the aggregate blend for the proposed JMF to make sure that the Sand Ratio is less than or equal to 60 percent. Calculate the Sand Ratio by using the following formula: Sand Ratio = B − D 100 ≤ 60 % C − D x Where: B = % of JMF passing the No. 30 sieve. C = % of JMF passing the No. 8 sieve. D = % of JMF passing the No. 200 sieve. Rev. February 5, 2007 15
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: Check sieves for conformance to AAS
Page 17 and 18: discussed a possible change for the
Page 19 and 20: equest must certify to the conditio
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
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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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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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