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DEVELOPMENT OF SKID RESISTANT HOT ASPHALT MIXTURES BY BLENDING AGGREGATES FROM DIFFERENT SOURCES

DEVELOPMENT OF SKID RESISTANT HOT ASPHALT MIXTURES BY BLENDING AGGREGATES FROM DIFFERENT SOURCES. AMNON RAVINA- Geokom Ltd. SHIMON NESICHI – Israel National Roads Company. MAY 2011. Presentation Topics. Background- Shortage of basalt aggregates in Israel's Paving Industry R&D PROJECT :

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DEVELOPMENT OF SKID RESISTANT HOT ASPHALT MIXTURES BY BLENDING AGGREGATES FROM DIFFERENT SOURCES

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  1. DEVELOPMENT OF SKID RESISTANT HOT ASPHALT MIXTURES BY BLENDING AGGREGATES FROM DIFFERENT SOURCES AMNON RAVINA- Geokom Ltd. SHIMON NESICHI – Israel National Roads Company MAY 2011

  2. Presentation Topics • Background- Shortage of basalt aggregates in Israel's Paving Industry • R&D PROJECT : • Literature survey • Laboratory tests • Paving of a 4km experimental project • Performance monitoring • Implementation in INRC paving projects • Summary & Conclusions

  3. Background- Shortage of basalt aggregates in Israel's HMA Paving Industry (1) Israel’s HMA Paving industry at a Glance: About 25 HMA plants Annual HMA production – 5-6 million tons (about 1 ton per capita) 1.5-2.5 Million tons of surface mixtures(Annually)

  4. Background- Shortage of basalt aggregates in Israel's HMA Paving Industry (2) Basalt Shortage Problem(1): Only 2 types of aggregates available nationally: Dolomite and Basalt Best Polishing Resistant aggregate – basalt (PSV= 51- 55) Most Availablable Aggregate Dolomite / Limestone (PSV =30-40)

  5. Background- Shortage of basalt aggregates in Israel's HMA Paving Industry (3) Basalt Shortage Problem(2): Annual demand of Basalt Aggregate- 800000 tons (only 3 quarries) Basalt is the dominant coarse aggregate type used in surface mixtures Growing Demand due to implementation of SMA resurfacing policy

  6. DGA (left) Vs. SMA (right)–Hw no. 2- 2006 DOLOMITE- DGA BASALT- SMA

  7. Background- Shortage of basalt aggregates in Israel's HMA Paving Industry (3) Basalt Shortage Problem(3): Effect of shortage problems : Delays in projects Quality problems Price rise

  8. Background- Shortage of basalt aggregates in Israel's HMA Paving Industry (3) Basalt Shortage Problem(4): Basalt Price Rise2000-2006 (NIS) DOLOMITE

  9. Background- Shortage of basalt aggregates in Israel's HMA Paving Industry (3) Basalt Shortage Problem – Possible Solutions (5): VTOL Controlled Replacement of Some of the Basalt COARSE Aggregate by Dolomite (i.e.blending) WITHOUT SACRIFICING SKID RESISTANCE

  10. SMA GRADATION CURVE PERCENT PASSING (%) SIEVE

  11. DEVELOPMENT OF SKID RESISTANT HOT ASPHALT MIXTURES BY BLENDING AGGREGATES FROM DIFFERENT SOURCES R&D PROJECT : Literature survey Laboratory tests Paving of a 4km experimental project (test sections) Performance monitoring of test sections Implementation in INRC’s paving projects

  12. R&D PROJECT- LITERATURE SURVEY(1) We didn’t invent the wheel ! Two examples of applying the “blending of aggregates” concept: Liang - Blending proportions of high skid and low skid aggregate- OHIO 2002 Dumitru , Vasile , Sidney - Safer roads for Tasmania Gunn’s Hill project – skid resistance field assessment- 2007

  13. R&D PROJECT- LITERATURE SURVEY(2) Blending up to 50% is possible without sacrificing Polishing Resistance! Start with lab tests (e.g.PSV) of varying blends – to determine combinations Don’t release your specs requirements Continue with amonitoring plan of AC-mix plant production, field test section constructionandfield service performance Approve for routine use (if successful…)

  14. R&D PROJECT- LAB TESTS (1) Feasibility study Test Effect of various combinations of basalt /dolomite on PSV Compare the results to the specs

  15. R&D PROJECT- LAB TESTSFEASIBILITY STUDY (2) • 2 Dolomite quarries • 1 Basalt quarry Specs limit- 48

  16. R&D PROJECT- LAB TESTSFULL PROJECT DATA (3) • 6 Dolomite quarries • 1 Basalt quarry Specs limit- 48

  17. R&D PROJECT- LAB TESTS – CONCLUSIONS (4) • Successful Blending of Basalt and Dolomite is feasible • 60% Basalt / 40% Dolomite satisfy the PSV>=48 Limit

  18. Paving of a 4km experimental project -DESIGN (1) 2 Dolomite sources (quarries) 1 Basalt source (quarry) 2 HMA types ( SMA, “S- Structural”) 8 Mixtures

  19. Paving of a 4km experimental project -DESIGN(2) SMA “BLENDS”

  20. Paving of a 4km experimental project -DESIGN(3) S-Str “BLENDS”

  21. Paving of a 4km experimental project -DESIGN(4) PROJECT LOCATION (historical)

  22. Paving of a 4km experimental project -DESIGN(5) PROJECTLOCATION (2011) ROAD784

  23. Paving of a 4km experimental project -DESIGN(6) Total Production- 9000 Tons Experimental Test Sections – B-D Blending- 7000 tons Total project length- about 4 Km Overlay project- mill/overlay – 5 cm

  24. Paving of a 4km experimental project - CONSTRUCTION(1) NO production problems NO workability difficulties NO problems in controlling proportioning – production & QA/QC

  25. AGGREGATE EXTRACTION Paving of a 4km experimental project - CONSTRUCTION(2) THE “ZEBRA” MIX

  26. Paving of a 4km experimental project - CONSTRUCTION(3) BOTTOM LINE– EXCELLENT CONSTRUCTION QUALITY ACHIEVED!

  27. Paving of a 4km experimental project - CONSTRUCTION(4) Z-SMA Z-SMA B-SMA

  28. Performance monitoring of test sections(1) MONITORING PROGRAM Z-SMA ROAR- 75 KM/H , 86% FIXED SLIP, 0.5 mm GRIPTESTER- 75KM/H, 0.5 mm

  29. Performance monitoring of test sections(2) MU- SMA MIXTURES – 16 Months - ROAR Z-SMA

  30. Performance monitoring of test sections(3) MU- S- Str MIXTURES – 16 Months - ROAR Z-SMA

  31. Performance monitoring of test sections(4) MU- S- Str MIXTURES – 16 Months – GT-MK2 Z-SMA

  32. Performance monitoring of test sections(5) SMA MIXTURES – 16 Months - MPD Z-SMA

  33. Performance monitoring of test sections(6) S- Str MIXTURES – 16 Months - MPD Z-SMA

  34. Performance monitoring of test sections(6) MU - ALL MIXTURES – 16 / 28 Months Z-SMA MU – ROAR 16 MONTH MU – GT – MK2 , 28 MONTH

  35. Performance monitoring of test sections – conclusions (6) • The blended (“ZEBRA”) mixtures are: • Superior in friction performance to dolomite mixtures • Close in friction performance to basalt mixtures • These findings are valid after 2.5 years service period in medium trafficked road (AADT=15000) • There is no effect of aggregate type on texture depth Z-SMA

  36. Updating Design Guidelines: “ZEBRA” mixtures may be used in roads with an AADT of 5000 to 20,000, or in other roads (with less traffic) that require improvement in the SR Basalt mixtures are required only for roads with AADT of over 20000 “ZEBRA” mixtures are included in the INRC general specs Implementation in INRC paving projects (from 2010)

  37. Controlled blending of high and low PR aggregates is an accepted procedure internationally Laboratory PSV tests, established the feasibility of 60% Basalt / 40% Dolomite blending ratio Summary & Conclusions (1)

  38. Constructing a four kilometer test section with various HMA mixtures: Basalt, Dolomite and 60%-40 % Basalt-Dolomite ("ZEBRA" ) blend demonstrated that the " ZEBRA " mixtures met the all acceptance specification requirements – similar to other control mixtures. Field performance monitoring proved that the SR of the " ZEBRA " mixtures was superior to the Dolomite's and close to Basalt's. Summary & Conclusions (2)

  39. Based on these findings, the " ZEBRA " mixtures were introduced to the INRC's specifications and design guidelines. It is estimated that applying the new design guidelines may save about 450000 tons of basalt aggregate- annually. Summary & Conclusions (3)

  40. THANK YOU…

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