NCAT PAVEMENT TEST TRACK

Transcription

1 NCAT PAVEMENT TEST TRACK 1

2 REPLACEMENT SECTIONS Red Mill and Inlay New Mix Performance Sections (11) Blue Excavate and Install New Structural Sections (5) 2

3 RESEARCH SPONSORS (+ FHWA) 3

4 CHAIN OF COMMAND 4

5 2006 TRACK OBJECTIVES Continuation/Expansion of Structural Experiment Top-Down Cracking Perpetual Pavement Designs Weak Subgrades Flat and Elongated Coarse Aggregate Effects Twin Layer Placement of Dual Drainage Layers RAP Percentage and Binder Grade Gravel Open Graded Friction Coarse Effect of Varying Air Voids on Performance Pavement Preservation Techniques in Texas 5

6 PREBID DISCUSSION PROJECTS AU Bid #258 - Plant Production of Research Mixes AU Bid #259 - Placement of Research Mixes Specifications for both projects are derivations of the ALDOT specifications from April 2006 (including both production and placement) Scope of work has been altered in consideration of high construction prices to simplify bidding and shift as much uncertainty as possible from contractor to AU 6

7 PLANT PRODUCTION SCOPE (#258) Expect about 50 unique production runs Aggregate from 40 stockpiles will be provided Contractor must transport from Track if no room to dump Liquid asphalt in 5 different specification grades Supply and delivery will be provided by separate contract Contractor s tank resources will be considered Superpave (424), SMA (423) and OGFC (420) mixes Both batch and drum plants can meet specification Initial plant settings and adjustments provided by NCAT Input from contractor via plant experience is expected 7

8 AGGREGATE HAULING 8

9 ONSITE STOCKPILE STAGING 9

10 PLANT REQUIREMENTS Contractor can still bring plant to Track (with own power) Two liquid asphalt storage compartments Damaged material replaced at contractor s expense Ability to pump liquid asphalt directly from tanker Must be able to handle RAP mix production At least five aggregate bins (RAP can be one of five) Need to add flyash, hydrated lime and fiber to same mix Gradation specification is extremely challenging Significant wasting is required to run quality mix Production rate as low as 150 tons per hour Plants must Be approved by NCAT before use 10

11 PREPARED PLANT SITE 11

12 MIX QUALITY Run trial mix using sponsor s JMF Set final JMF for placement on Track Asphalt content within 0.3 percent Rock (>#4) within 3 percent Sand (<#4 and >#200) within 2 percent Dust (<#200) within 1 percent 12

13 OFF-SITE PLANTS Contractor is required to deliver mix to Track Temperature of delivery no cooler than 290 F Drop in temperature no more than 30 F Production temperature between 320 and 350 F Actual plant temperature established by NCAT 13

14 WORK PLANNING Plan to work Mon-Fri from 6:00 am to 5:00 pm Designated start time provided by NCAT 5 days advance notice provided for weekends Provided to superintendent before end of prior day Payment computed from start to last load out Routine preparation and cleanup not included 14

15 RUNNING TRACK MIX Surge Bin Practice 10 tons Uncoated Aggregates 15 tons Coated Mix to Waste, Empty Bin Accumulate 40 tons in Bin, Load First Truck 15 tons Coated Mix to Waste, Empty Bin 15

16 QUALITY CONTROL SAMPLING 16

17 PLANT PAYMENT Payment will be by the production hour Expect approximately 200 hours of paid time No additional payment for incidental costs No payment for non-ncat down time All-or-none bidding via ALDOT is allowed 17

18 MIX PLACEMENT SCOPE (#259) 50 production mixes placed in 34 sublots (200 ft lane lifts) Half of mix placed on Track and half off (most on hill) Test sections up to 14 thick in as many as 5 layers Superpave (424), SMA (423) and OGFC (420) mixes Contractor provides tack truck, ALDOT tack, crew and tools NCAT provides all other necessary equipment Contractor expected to clean and maintain equipment Test sections milled, swept and ready to pave by NCAT Target density is 94 percent (± 1.2 percent) Input from contractor via roadway experience is expected 18

19 PAVING 2003 TRIAL MIX 19

20 EQUIPMENT DONATIONS 20

21 WORK PLANNING Plan to work Mon-Fri from 7:00 am to 7:00 pm 5 days Advance notice provided for weekends Designated start time provided by NCAT Provided to foreman before end of prior day Payment computed from start time to density Routine preparation and cleanup not included 21

22 PLACEMENT REQUIREMENTS Transfer equipment will be utilized Paving speed will be slow but steady Thickness will be achieved via wheelpath stick Rolling will begin as soon as paving completed Special care for longitudinal & transverse joints Expect to provide at least an 8 man crew Resumes will be provided for prequalification Work must be correlated with plant production 22

23 REPLACEMENT SECTIONS Red Mill and Inlay New Mix Performance Sections (11) Blue Excavate and Install New Structural Sections (5) 23

24 RUTTING SECTIONS 24

25 THICKNESS CONTROL 25

26 2006 STRUCTURAL EXPERIMENT 26

27 STRUCTURAL MILLING 27

28 RAMPING IN AND OUT 28

29 RAIN PROTECTION 29

30 PAVING PREP WORK 30

31 PAVER SETUP 31

32 SECTION LAYOUT 200 ft Total Constructed Section Length Wheelpath Densities & Transverse Profiles Random Test Location X X Random Test Location Wheelpath Densities & Transverse Profiles X X Wheelpath Densities & Transverse Profiles Random Test Location X X CL Instrumentation Array 25 ft 50 ft 50 ft 50 ft 25 ft Buffer Replicate Replicate Replicate Buffer 32

33 TRANSVERSE JOINTS 33

34 MILLING & PAVING TOLERANCES Paving Average Within 0.2 of Target (SD <= 0.1 ) Sections Surveyed Before & After to Verify Quality Middle 150 ft Roughness (IRI) <= 45 inches per mile Overall Roughness (IRI) <= 80 inches per mile Joints Checked with 15 ft Straightedge to Within ¼ 34

35 ROUGHNESS REQUIREMENTS 35

36 SPECIAL PAVER FOR N13 36

37 SPECIAL PAVER FOR N13 37

38 TEXAS CONSIDERATIONS 38

39 PLACEMENT PAYMENT Payment will be by the placement hour Expect approximately 200 hours of paid time No additional payment for incidental costs No payment for non-ncat down time All-or-none bidding via ALDOT is allowed 39

40 SPECIFICATION CONFORMANCE Bidders must submit resumes for prequalification AU vendor registration is another bid condition If poor quality is NCAT s fault, additional pmt If poor quality is contractor s fault, no additional pmt If contractor cannot or will not meet quality standards, contracts will be terminated and reawarded 40

41 WEATHER CONSIDERATIONS 41

42 RUN FIRST MIX ON 8/9/06 42

43 2006 FLEET OPERATIONS 43