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1、William G. Buttlar Eshan V. Dave University of Illinois, Urbana, IL Daniel S. Sherman V3 Companies of Illinois, Woodridge, IL,Hybrid Reflective-crack Relief System At Greater Peoria Regional Airport: A Case Study,Outline,Introduction to Reflective Cracking Greater Peoria Regional Airport Design and
2、Construction of a Hybrid Reflective Crack Relief System Material Characterization and Modeling Field Performance Summary and Conclusions,2,Appearance of a cracking pattern in the surface of an overlay that reflects the cracking/joint pattern in the underlying pavement Allows water to infiltrate into
3、 underlying pavement structure, leading to further deterioration One of the predominant failure modes in rehabilitated pavements Often overlooked during overlay design,Reflective Cracking in Asphalt Overlays,3,Interlayer Treatments,Reinforcement Layers and Paving Fabrics Steel Netting Fabrics/Geotex
4、tiles Grid Type Systems Composite Systems (e.g. ISAC) Stress Absorbing Membrane Interlayers (or SAMIs) Sand Anti-Fracture Mixtures (SAF) Strain-Tolerant Interlayer Mixtures Reflective Crack Relief Interlayers (RCRI),4,Greater Peoria Regional Airport (GPRA),Air Traffic: 36,000 operations in 2009 TWY
5、E: Flexible pavement; multiple overly cycles, recent cycles only lasting 7 years Severe reflective cracking distress Cracks of up to 50 mm width 15 50 m crack spacing,5,TWY E in 1999,Air Traffic: 36,000,6,TWY E in 1999,7,Extent of Project,Taxiway-E: Main taxiway parallel to Rwy 13-31 Approximately 1
6、780 m C/L length (5800 ft) Project involved resurfacing and widening in some areas,8,Rehabilitation Strategy,Existing conditions were very severe: Reflective, block, and longitudinal (cold joint) cracks Reflective cracks were very wide and cupped Reflective cracks were widely spaced (avg = 100) Cold
7、 winters, freeze-thaw, heavy aircraft (727, DC-8, C-130 Air National Guard, Antonov Caterpillar HQ) Initially, the ISAC (Interlayer Stress Absorbing Composite) was proposed. However, due to the very wide crack spacing, predicted horizontal joint movements were predicted to be too severe for the stan
8、dard ISAC strip treatment. The U of I research team was tasked with developing a variant on the ISAC system. FEA showed that a thicker stress absorbing layer was needed.,9,Kim, J., and W. G. Buttlar, Analysis of Reflective Crack Control System Involving Reinforcing Grid over Base-Isolating Interlaye
9、r Mixture, ASCE Journal of Transportation Engineering, Vol. 128, No. 4, pp. 375-384, 2002.,Rehabilitation Strategy,10,A hybrid reflective crack relief system (RCRS) was developed using 3D FEA, that combines: Reinforcement grid (restrict movement, reinforce HMA) Thick (50 mm) stress absorbing membran
10、e interlayer (base isolation, protect/isolate grid)field produced (too thick for pre-fab),Schematic of Hybrid RCRS,Base isolation layer was designed as strip-type inlay (50 mm thick), or partial-depth patch,11,RCRS Material Details,Strain Tolerant Mixture 4.75 mm top aggregate size sand mixture 8% a
11、sphalt content and 3.5% air voids at 50 gyrations PG 76-31 Binder Grid System: GlasGrid 8502 Fabric 12.5 mm x 12.5 mm (0.5 x 0.5 inch) opening 1.5 m wide strip application over base isolation interlayer Pressure-activated coating,12,RCRS Construction,13,Area-wide Milling,Additional 1.2 m x 50 mm Mil
12、ling over cracks,Placement of Interlayer,1.5 m wide Fiberglass Reinforcement,Construction (cont.),14,Paving the SAMI,Rolling the SAMI,Overlay Paving,Milling,Milling Benefits,15,Remove Block and Longitudinal Cracks,Eliminates Crack Cupping and Associated Bump,Cracks are Much Narrower after Milling,Mi
13、lled Cracks did not Require Sealant, Saved $,Before Milling,After Milling,Material Characterization,Indirect tension Test (AASHTO T-322) Viscoelastic Characterization Tensile Strength Disk-shaped Compact Tension Test (DCT) ASTM D7313-07 Fracture Energy of Asphalt Concrete,16,Finite Element Modeling,
14、FE Modeling was conducted for control and treated sections Cohesive zone (CZ) elements were utilized for modeling of fracture and damage Bulk material response was simulated as viscoelastic Frictional interfaces were utilized between pavement layers Temperature boundary conditions were determined us
15、ing calibrated integrated climatic model (ICM) Tire Load MD-88 Main Landing Gear AC 150/5320-6D,17,FE Model Schematic,18,Overlay,Interlayer,Existing AC Pavement,Granular Base,Crack in Existing AC Pavement,Cohesive Zone Elements,Fiberglass Grid,Modeling Results,Treated section has better reflective c
16、racking performance Low to moderate potential for cracks to form at edge of RCRS,19,Field Performance: Cracking,Crack surveys: 1999, 2000, 2003, 2004, 2007, 2009,20,Existing Pavement,Treated Pavement,Field Performance: Reflective Cracking,Percent reflected cracks obtained through use of underlying crack location prior to rehabilitation,21,Typical Cracks 2007 Survey,22,Typical Reflection Cracking in Treated Section after Nine Years (2009),23,Typical Reflection Cracking
