Project Selection Cody Brand | Soils Engineer October 12, 2018 mndot.gov
Overview • Needs Determination • Project Timing • Mix of Fixes • Chip Seals 10/15/2018 mndot.gov 2
Needs Determination 10/15/2018 mndot.gov 3
Needs Determination 2017 "GOOD" Ride Quality Index (RQI) 100% 90% 80% 70% NHS TARGET: 65% OR GREATER 60% NON-NHS TARGET: 60% OR GREATER 50% 40% 30% 20% 10% 0% NHS NON-NHS NHS NON-NHS NHS NON-NHS NHS NON-NHS NHS NON-NHS NHS NON-NHS NHS NON-NHS NHS NON-NHS NHS NON-NHS DISTRICT 1 DISTRICT 2 DISTRICT 3 DISTRICT 4 DISTRICT 6 DISTRICT 7 DISTRICT 8 METRO STATEWIDE AVG. 10/15/2018 mndot.gov 4
Needs Determination NHS PAVEMENT CONDITIONS (with STIP) “POOR” (RQI < 2.1) 100% 47 MILES “POOR” TARGET: 2% OR LESS 90% “FAIR” 80% 70% “GOOD” TARGET: 65% OR GREATER 60% 232 MILES 50% 40% “GOOD” (RQI > 3.0) 30% 20% 10% 0% 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 10/15/2018 mndot.gov 5
Needs Determination NHS PAVEMENT CONDITIONS (without Programed Work) 100% “POOR” (RQI < 2.1) 90% 80% “FAIR” 70% 60% 50% 40% “GOOD” (RQI > 3.0) 30% 20% 10% 0% 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 10/15/2018 mndot.gov 6
Project Timing 10/15/2018 mndot.gov 7
Project Timing PAVEMENT CONDITION TIME / TRAFFIC 10/15/2018 mndot.gov 8
Defining “Pavement Condition” • Measures include: • Ride Quality Index (RQI) • Remaining Service Life (RSL) • Surface Rating (SR) • Crack Counts 10/15/2018 mndot.gov 9
Project Timing Surface Treatment PAVEMENT CONDITION Major Rehabilitation TIME / TRAFFIC 10/15/2018 mndot.gov 10
Mix of Fixes • Major Rehabilitation • Cold In-Place Recycle • Full Depth Reclamation • Concrete Overlay & Whitetopping • Resurfacing • Mill & Overlay • Surface Treatments 10/15/2018 mndot.gov 11
Crack Propagation through Bituminous Pavement 30% of Bit. pavements Bituminous have concrete underneath Concrete 60% are > 50 Years Old Time Bituminous Old Bit. 75% are > 50 Years Old Bituminous Gravel Gravel Time Time 10/15/2018 mndot.gov 12
Mill & Overlay Time 10/15/2018 mndot.gov 13
Cold In-Place Recycle Time 10/15/2018 mndot.gov 14
Full Depth Reclamation Time 10/15/2018 mndot.gov 15
Concrete Overlay / Whitetopping 10/15/2018 mndot.gov 16
Major Rehabilitation PAVEMENT CONDITION TIME / TRAFFIC 10/15/2018 mndot.gov 17
Surface Treatment Time Time Micro-mill & UTBWC 10/15/2018 mndot.gov 18
Micro-Milling with Surface Treatments Micro Milling with Micro Surfacing 180 160 140 Average IRI (inches/mile) 120 TH64 US 12 100 US 10 80 60 40 Before After Micro After Micro After 1 Year After 2 After 3 After 4 Google: “MnDOT Micro Milling” Micro Mill Mill Surfacing Years Years Years 10/15/2018 mndot.gov 19
Resurfacing PAVEMENT CONDITION TIME / TRAFFIC 10/15/2018 mndot.gov 20
Mix of Fixes 10/15/2018 mndot.gov 21
Chip Seals • Minnesota Seal Coat Handbook: 1. Primary Benefit – Protect Pavement from Weather • Sun, Wind, and Water causes Oxidation 2. Secondary Benefit – Reduces Raveling / Increases Friction • Raveling – loss of fines from the pavement surface • Caused by Traffic, Plowing, and Weather 10/15/2018 mndot.gov 22
Chip Seals • Two seal coat test sections constructed in D8 • TH 19 from Marshall to JCT. TH 67 • 2001 – Construction – Mill to Concrete, and place 5” Bituminous • 2009 – Seal Coat (with 2 control sections) • 2016 RQI – No difference between sections • TH 23 from US 71 Split to New London • 2003 / 2004 – Construction – Regrade , 24” Base, 6” Bituminous • 2011 – Seal Coat (with 7 control sections) • 2016 RQI – No difference between sections 10/15/2018 mndot.gov 23
Chip Seals MN 56 in D6, Chip Seal Test Section 10/15/2018 mndot.gov 24
Thank you Cody Brand cody.brand@state.mn.us 10/15/2018 mndot.gov 25
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