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

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Balances (QA team check with known weight) Gyratory compactor-Ensure inside diameter of gyratory molds meets tolerances specified in Section 4.2 of AASHTO T 312. Molds found to be outside the tolerance should be discarded. Vacuum pumps, hoses, bowl or flask, manometer gauge and hookup, etc. Water baths, thermometers, ovens Fax and copy machine • Review with the QC team’s proposed sampling locations and splitting procedures. • Review procedure for determining the reheat correction factors for G mb and G mm and the dryback correction procedure. • Verify that the Hydrated Lime feed system meets the requirements of 401.03.2.1.1 and 401.03.2.1.2 and that the Contractor has the required hydrated lime inventory (401.02.3.1). 6.3.2 Start-up Day. A member of the District QA team should be at the QC laboratory on start-up day. This person should: • Verify that the Contractor is producing the “Tentatively Approved” mixture design. • Verify the source of supply of the asphalt binder. Materials from different sources should not be mixed without prior written approval of the Engineer (401.03.2.1.5). • Verify that the maximum amount of material being fed through a single cold feed is 45 percent (401.03.2.1.2). • Verify that the RAP scalping screen is in place and functioning (401.02.3.1). • Observe sampling and splitting procedures. • Observe testing procedures including reducing the field sample to testing size. • Check nuclear asphalt content gauge calibration using standard pan or verify that the incinerator oven has been properly calibrated. • Verify that the mixture moisture content determined for correcting the asphalt content meets the requirements of 401.03.2.1.3. Review data calculations to include: • Asphalt content (P b ). • Mix air voids (P a ). • Voids in the Mineral Aggregate (VMA). • Running average (if applicable). Compare Contractor process control data with the Job Mix <strong>For</strong>mula (JMF) data as soon as possible (voids, VMA, G mm , G mb , asphalt content and gradation). Rev. February 5, 2007 44
Arrange to have a verification sample tested by the QA team and compare results with the QC data as soon as possible. These sample test results may be used as one of the required 10% QA verification tests. Designate one of the retained samples for the Contractor to use for determining reheat correction factors if appropriate. 6.3.3 During Production. Periodically witness the sampling and testing being performed by the Contractor. Promptly notify the Contractor both verbally and in writing of any observed deficiencies. Use the evaluation forms (QMP Inspector’s Checklist) in the Appendix to document any observed testing deficiencies. Have the Contractor’s technician sign a copy of the evaluation form. Review the plant production requirements. • Verify that the Contractor is producing the “Tentatively Approved” mixture design. • Verify the source of supply of the asphalt binder. Materials from different sources should not be mixed without prior written approval of the Engineer (401.03.2.1.5). • Verify that the maximum amount of material being fed through a single cold feed is 45 percent (401.03.2.1.2). • Verify that the RAP scalping screen is in place and functioning (401.02.3.1). • Verify that the mixture moisture content determined for correcting the asphalt content meets the requirements of 401.03.2.1.3. Check the random sampling procedure. • Make sure the QC team is using the random number table correctly and that they are calculating random numbers for four samples each day. • Compare the estimated tonnage used for determining sample location with actual tonnage produced. • The QC team is not allowed to inform the plant when the random verification sampling will be done. Samples: • Insure all required samples are being taken and tested. Random samples. Boiling Water Test. Tensile strength ratio tests have been conducted at proper intervals. Aggregate stockpile samples. Fine aggregate angularity index. Rev. February 5, 2007 45
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 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: verification test results fail to m
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
Page 57 and 58: The above table shows that the Step
Page 59 and 60: 7.4.3 Nuclear Density Testing 1. Se
Page 61 and 62: The acceptable range of individual
Page 63 and 64: Site 1 Site 2 Site 3 Site 4 Site 5
Page 65 and 66: Allowable Gauge Bias Deviation (Tab
Page 68 and 69: Re-Evaluating a Corrected Lot (Two
Page 70 and 71: Rev. 6/01/05 Mississippi Department
Page 94 and 95:
Rev. 6/01/05 Mississippi Department
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Rev. 6/01/05 Mississippi Department
Page 98 and 99:
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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FIELD MANUAL For HOT MIX ASPHALT (HMA) - Mississippi ...

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