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SUMMARY AND CONCLUSIONS With any new form of technology, there will always be some problems that need to be resolved during the initial learning period. The dowel bar inserter is no exception to this rule, and several problems have been identified with its performance on the projects in this study. However, none of these problems appear to be insurmountable. Through the continued cooperative efforts of Wis<strong>DOT</strong> construction personnel and the contractors, it should be possible to improve construction procedures to obtain consistent satisfactory results with the dowel bar inserter. The primary general recommendation of this study is to accept the dowel bar inserter as an equal alternate to dowel baskets for future Wis<strong>DOT</strong> doweled PCC construction projects. The following list of specific conclusions and recommendations are based on the results of this study. 1. 2. 3. 4. 5. 6. 7. The dowel bar inserter is capable of consistent satisfactory placement of dowel bars with respect to vertical translation -(average depth), vertical rotation (difference in depth between two ends of dowel), and horizontal rotation (difference in transverse position between two ends of dowel). The initial set-up of the dowel bar inserter with respect depth of dowel placement is critical at the start of each project, and dowel depths should be verified by probing through the fresh concrete. The construction procedures currently used for marking and sawing joints need improvement both for inserter and basket projects, to consistently and accurately align the sawn joints with the midpoints of the dowel bars. Having a magnetic rebar locator available on all doweled PCC construction projects would be useful in aligning sawn joints with the dowel bars and in identifying missing dowels. Ride quality has improved on each successive inserter project, and on the latest project, the South Madison Beltline, a project PSI of 4.6 was achieved with minimal diamond grinding. Improved concrete consolidation around the dowels is needed both on inserter and basket projects, and quality control coring is needed to assess future progress in solving the problem of voids around the dowel bars. Problems with missing dowel bars on existing inserter projects appear to be infrequent and isolated, but this problem should be monitored on future projects. 3.5.18 to
SUMMARY AND CONCLUSIONS (continued) 8. All of the data and conclusions in this study are valid only for the Guntert C Zimmerman dowel bar inserter used on the projects in this study. If a different brand of dowel bar inserter is used which differs widely in design and operation from the Guntert & Zimmerman model, a thorough performance evaluation will be essential. 3.5.19
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3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9
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h. The most common types of pavemen
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Fidh'X TECHSiC.AL .AL1L~!SC!?'r' T
Page 8 and 9: F!-ih'.A TECHN1C.U XDI'IS3RY T 5010
Page 10 and 11: TABLE 3. MAXIMUM RECOMMENDED TIEBAR
Page 12 and 13: ?%‘.4 TECHWIC.4L ADVISORY T 3040.
Page 14 and 15: . C ‘i!\‘*A . . T’ECHSIC4L .U
Page 16 and 17: CH!\‘.?l TECZSIC'.AL ADVISORY T 5
Page 18 and 19: TIEBAR PULL-OUT TESTS Proper consol
Page 20 and 21: '1iK.A TECHNICAL XDVISCIRY T 5040.3
Page 22 and 23: TECHNICAL PAPER 89-03 -- Benefits o
Page 24 and 25: critical, as the restraint forces d
Page 28 and 29: TECRWICAL PAPER 89-04 -- PREFORMED
Page 30 and 31: maximum expansion. This will allow
Page 32 and 33: When sealing a width of two lanes o
Page 34 and 35: BXAHPLB B: The State elects to chan
Page 36 and 37: References 1. l'Design and Control
Page 38 and 39: Based on Kansas Standard Plan 707.2
Page 41 and 42: SlJbJect- Dowel Bar Inserters Date
Page 43 and 44: Dowel Bar Placement: pechanical Ins
Page 45 and 46: TABLE OF CONTENTS Abstract . . . .
Page 47 and 48: In July of 1988 this need for addit
Page 49 and 50: _i -. Corinu Procedure: A metal det
Page 51 and 52: PLACEMENT TOLERANCE SPECIFICATIONS
Page 53 and 54: placing dowels in a satisfactory cl
Page 55 and 56: ar inserter. On the first inserter
Page 57: extensive searches if a problem is
Page 61 and 62: TABLE 1. DESCRIPIIOR OF PROJECYS IW
Page 63 and 64: TABLE 3. RANDOM SAMPLING SEQUENCE F
Page 65 and 66: .FICURE 1. COWEURAT?ON AND NuMBml;
Page 67: : __ APPENDIX A. DETAILED DATA FOR
Page 70 and 71: FHWA TECHNICAL ADVISORY T 5080.14 J
Page 74 and 75: FHWA TECiNICAL ADVISORY T 5080.14 J
Page 76 and 77: l.onghJdinal SECTION A-A onalmclion
Page 83: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. REFE
Page 86 and 87: CASE STUDY - CONTINUOUSLY REINFORCE
Page 88 and 89: serve as a leveling course, to corr
Page 90 and 91: v. Details of Field Review It was n
Page 92 and 93: practice, chloride contents above 1
Page 94 and 95: pavement is constructed, we also re
Page 96 and 97: Sing1 e Lane Longitudfnal Bat CRCP
Page 99 and 100: LATERAL LOAD DISTRIBCTION AND THE L
Page 101 and 102: PURPOSE This paper summarizes data
Page 103 and 104: .A thxd study was ?e?ormed 5~ :he S
Page 105 and 106: __. Table 2. Encroachments on outsi
Page 107 and 108: The results presented by Ezery :\*e
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from the siab edge. The number of t
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-1 5 13 19 25 31 37 43 49 55 51 6i
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.A ::cleoier:Cai ?'.'3iU2::0:: Oi 5
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.M~&$iU~eTle~t!S and eStZbliSkfXl t
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Photos 5 k 6 - Two examples of wide
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0 ,A KC pavement that is widened 18
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13. Gordon K. Ray, ‘Concrete Shou
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I-60 Lmqitudinal CrackFnq - l988 in
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ill operatfms were cm@etM by July 1
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US. Deparmenr ol Transpoftarxx Fede
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FHWA TECHNICAL ADVISORY T 5080.17 J
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FHWA TECHKICAL ADVISORY T 5080.17 J
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L 2 R'RWA TECEXICAL ADVISORY T 5080
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FFIWA TECHNICAL ADVISORY T 5080.17
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FHwA TECHNICAL ADVISORY T 5080.17 J
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7i%iA TZCHKICAL ADVISCRY T 5C80.17
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1. Platerials FHWA TECHNICAL ADVISO
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3. Mixins B. Batchers (1) (2) (3) (
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1. 2. 3. 4. 5. FHWA TECHNICAL ADVIS
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8. TEMPERATURE CONTROL FHWA TECHNIC
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1. SUBBASE TRIYMING FHWA TECHNICAL
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12. 13. 14. TRUCK REGUIREMENTS FHWA
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16. THICKNESS TEST FHWA TECHNICAL A
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25. 26. (cl (d) FHWA TECHNICAL ADVI
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IO IS 20 25 x> Air temp., OC To use
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FHWA TECHNIC= ADVISORY T 5080.17 ju
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FHWA TECHNICti ADVISORY T 5080.17 J
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RSQUIREMENTS 1’. General Retireme
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48Cl Sum&y of State Highway Practic
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Quotatims (con’t~ (30); &lignment
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We recognize that some States have
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