New Composite Pavement Systems
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1 Kurt Smith Applied Pavement Technology, Inc. 1 New Composite Pavement Systems Virginia Concrete Conference March 3, 2017
2 Outline 1. What are Composite Pavements? 2. SHRP2 Project R21 3. HMA/PCC Composite Projects 4. SHRP2 R21 Implementation 5. VDOT R21 Composite Pavement 6. Summary
3 1. What Are Composite Pavements Systems? Multi-lift pavement structures designed for long life, rapid renewal, and optimized performance New hot-mix asphalt on portland cement concrete (HMA/PCC) Two-Lift concrete paving (PCC/PCC placed wet-on-wet) New construction (not overlays)
4 Composite Pavement Systems HMA/PCC High-quality, new HMA surface SMA, PMA, WMA, etc. Optimized for design conditions New PCC structural layer (JPC, CRC) 1 to 3 in (typical) New HMA Surface (thin) Hot Mix Asphalt (SMA, PMA, Superpave, etc.) PCC Layer New PCC Layer JPCP, CRCP, RCC, etc. (JPC, CRC).
5 Composite Pavement Systems PCC/PCC Thin PCC surface layer Quality aggregates Optimized for conditions (friction, noise) Thicker PCC structural layer Local/recycled aggregates 2 to 3 in (typical) New PCC Surface (thin) Hot Mix Asphalt (SMA, PMA, Superpave, etc.) Layer New PCC Lower Layer JPCP, CRCP, RCC, etc. (JPC, CRC)
6 Benefits/Advantages of Composite Systems Optimized pavement surface (friction, noise) Renewable Long service life Sustainability considerations Use of local/recycled aggregates Reduced transport costs Reduced cement contents (bottom layer) Durability & long life Reduced carbon footprint Cost competitive
7 Example Composite Paving Projects I-10, Phoenix (1994) Mn/Road Albertville, MN (2010) I-70, Abilene, KS (2008) IL Tollway ( ) I-75, Detroit (1993) White Rd, Columbus, OH (2004) HMA/PCC PCC/PCC I-10, San Antonio (1986) US 41, Ft. Myers, FL (1978)
8 2. SHRP2 Project R21 Research study, Activities: Review of European practices Field demonstration Analytical studies Developed improved guidance on design and construction of composite systems
9 R21 Research Approach for Composite Pavements Constructed HMA/PCC projects MnROAD Univ. of Calif. Pavement Research Center (ALF testing) IL Tollway (north of Chicago) Constructed PCC/PCC projects MnROAD Studied existing projects in U.S. and Europe Extensive analysis of HMA/PCC and PCC/PCC behavior and performance
10 SHRP2 Project R21 Products Pavement Design Guidelines Proposed revisions to: AASHTOWare Pavement ME Design software AASHTO MEPDG Manual of Practice Technical Guidelines Construction Guidelines Materials Guidelines Quality Management
11 3. HMA/PCC Composite Projects Extensive use in Europe (e.g., Germany, Netherlands) Strong use throughout North America (e.g., AZ, OH, IL, TX, ONT) PCC Layer = Structural (loadcarrying) capacity HMA = Functional capacity (smoothness, friction, noise) Renewable surface
12 12 Germany A inch SMA / 10.3 inch JPC Major freeway pavement 15-ft joints in JPC HMA surface sawed & sealed above transverse and longitudinal joints Excellent performance
13 White Road Columbus, Ohio 3-inch HMA / 8-inch RCC Local road Low to medium traffic levels 45-ft Joints in RCC HMA surface sawed & sealed Easy maintenance for utility cuts Good performance
14 PCC Temperature and Humidity HMA placed
15 Potential Concern: Reflective Cracking Major issue for HMA/PCC Solutions Saw and seal joints Use other mitigation techniques Avoid jointed pavements! Reflection Cracking CRCP Sawed/Sealed Joint
16 4. SHRP2 R21 Implementation Part of larger effort to promote findings from SHRP2 research Administered by FHWA Goal: Support and promote adoption of composite pavement systems HMA/PCC PCC/PCC Support period: 2014 to 2018
17 SHRP2 R21 Implementation Grants FHWA provides incentive funding under SHRP2 R21 project for lead adopters of composite paving technology Lead Agencies: Tennessee (October 2015) (PCC/PCC) California (January 2017) (PCC/PCC) Texas (April/May 2017) (PCC/PCC) Virginia (Summer 2017) (HMA/PCC)
18 5. VDOT R21 Composite Pavement Project Description US 60 WB (Henrico County) 2-lane divided suburban highway Open ditch Minor cut/fill 1.22 miles long Traffic: 14,000 ADT (6% trucks)
19 Project Location US 60 WB (I-295 bridge to ~Whiteside Rd.)
20 Existing Pavement 8 inch CRCP/6 inch CTA Built in Distress Ratings: CDR = 31 CPR = 42
21 Why Composite? VDOT Experience SMA/Jointed SMA/CRC
22 New Pavement Structure 2-inch SMA surface 8-inch CRCP base slab Underdrains 30-year design and 5.3 million ESALs
23 Current Status Advertise March/ April 2017 Construction July-October 2017
24 6. Summary Composite pavement structures PCC/PCC & HMA/PCC New design (not overlays!) Characteristics: Long life Optimized surface characteristics Sustainability benefits Cost competitive Several recent and current U.S. projects VDOT HMA/PCC composite in Summer 2017
25 Questions? Kurt Smith Shabbir Hossain
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