Iowa s Best Practices for Full Depth Reclamation and Cold In-Place Recycling
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1 Iowa s Best Practices for Full Depth Reclamation and Cold In-Place Recycling Scott Schram, Ph.D., P.E. State Bituminous Engineer Iowa Department of Transportation
2 Experience with In-Place Recycling! Cold-in-place Recycling (foam and emulsion)!! 5-year Total!!53 projects!!$118m!!1800 lane-miles!! Many more local CIR projects! Full Depth Reclamation (fly ash stabilization)!! 5-year Total!!3 Projects!!$8.6M!!100 lane-miles
3 Iowa Field Performance 70 Average High Severity Transverse Cracking 10 Year Span (3-4 inches HMA Surface) 60 TCRACKH, count/km HMA/PCC HMA/HMA HMA/CIP/PCC HMA/CIP/HMA HMA/PCC (MILLED) HMA/HMA (MILLED) Cumulative Trucks, millions
4 Why Not More?! Traffic limitation (CIR < 2,000 VPD)! Only works with adequate structure! Risk when left open to high traffic! Overcome with KNOWLEDGE!
5 Common Questions! When CIR?!! Ideal candidate?!! Mix Design?!! Foam or Emulsion?!! When to overlay?!! Quality control/quality assurance?! When FDR?!! Ideal candidate?!! Stabilization?!! Mix Design?!! Quality control/quality assurance?
6 Project Evaluation! Traffic! Structure! Distress! Climate CIR (2-4 ) FDR (6-12 )
7 Cold In-Place Recycling! <= 2,000 ADT!! At least 8 thickness (3 HMA)!! Adequate structural support!! Surface distress!! Good candidate! > 2,000 ADT!! Can still be successful!! Project evaluation!! FWD, DCP, Coring
8 Project Evaluation
9 CIR Mix Design! Need RAP samples!! REPRESENTATIVE = DIFFICULT!! Milling 50 at 3 locations (preferred)!! Coring or air hammer patching
10 CIR Foam Mix Design 1. Determine Optimum Foaming F Binder (PG or PG 46-34) 1.5% - 3.5% water injection Target Half life and Expansion Ratio ~10 2. Determine Optimum Moisture Density Curve (Proctor) Experience > 4% optimum (adjusted for foaming water 3. Compact 4 foamed AC contents 1.5, 2.0, 2.5, 3.0% N=45 gyrations 4. Optimize AC foam content from IDT results
11 CIR Emulsion Mix Design! HFMS-2s (interstate and primary)! CSS1 (other projects)! 100+ mix designs! ~0.3 gallons/yd 2! Engineer may adjust rate to improve stability
12 Foam OR Emulsion?! Does it matter????!..sometimes.! Stabilizing agent will impact curing > OVERLAY! The magnitude of impact is material dependent
13 Curing Indirect Tensile Strength Indirect Tensile Strength, psi ~1.5% Moisture Power(Foam 1) Power(Foam 2) Power(Emulsion 1) Power(Emulsion 2) Moisture Content (%)
14 Curing Flow Number (Foam #1)
15 Curing Flow Number (Emulsion #1)
16 Curing Flow Number (Foam #2)
17 Curing Flow Number (Emulsion #2)
18 Curing Flow Number (Foam #3)
19 Curing Flow Number (Emulsion #3)
20 Curing Dynamic Modulus
21 Foam or Emulsion?! 12-month price history (2/2010 2/2011)! Foam!! $530/ton!! $ $0.70 per yd 2 -in! Emulsion!! $1.88/gal!! $ $0.66 per yd 2 -in! CIR!! $ $2.10/yd 2
22 70 Average High Severity Transverse Cracking 10 Year Span (3-4 inches HMA Surface) Iowa Field Performance 60 TCRACKH, count/km HMA/PCC HMA/HMA HMA/CIP/PCC HMA/CIP/HMA HMA/PCC (MILLED) HMA/HMA (MILLED) Cumulative Trucks, millions
23 Cold In-Place Recycling! Iowa is a leader in CIR! IHRB Project (University of Iowa)! Acknowledgement: David Lee! Stage 1: Lab evaluation! Stage 2: Curing model (moisture)! Stage 3: Curing criteria (stiffness gain)! Geo Gauge:!! 22 lbs!! Applies sinusoidal loading and measures deflection!! 3 to 70 MN/m
24 CIR Research
25 CIR Research
26
27 CIR Research
28 Iowa DOT Specifications! Mix Design!! Foam: tons/yd 2 -in!! Emulsion: 0.30 gallons/yd 2 -in! CIR allowed May 1 October 1!! 60F and rising! Quality Assurance (Nuclear Gauge)!! 94% density (primary)!! 92% density (other)! Overlay!! <2% moisture (or 0.3% of residual moisture)!! Then 14 calendar days to complete overlay
29 Hwy 78 Keokuk County (2000)
30 Hwy 78 Keokuk County (5 years)
31 Hwy 78 Keokuk County (7 years)
32 Hwy 78 Keokuk County (9 years)
33 Webster County 175! 2009 Construction! 9 FDR + 3 HMA (2011 = NO DISTRESS)! 3 CIR + 3 HMA (2011 = NO DISTRESS)! 2 CIR + 3 HMA (2011 = Few trans. cracks)! Mill HMA (2011 = Reflective Cracks)!"#$% &% '% (% )% *% +%,% -%.% &/% &&% &'% 0123%4567#8 9:% (;(% ';,% /;*% ';/% ';/% *;*% );/% /;/% ';.% ';,% (;/% ';,%!<9=>:"##3% 9:% -;/%,;*% &/;/%,;*%.;/% +;-%.;*% &/;(% -;(% -;*% -;/%,;-%
34 Hwy 175 Webster County (Pre- CIR)
35 Hwy 175 Webster County (CIR)
36 Hwy 175 Webster County (CIR 2 years)
37 Hwy 175 Webster County (Pre- FDR)
38 Hwy 175 Webster County (FDR)
39 Hwy 175 Webster County (FDR 2 years)
40 Hwy 175 Webster County (Pre-Mill)
41 Hwy 175 Webster County (Milled)
42 Hwy 175 Webster County (2 years)
43 Hwy 175 Webster County (Overlay)
44 Keys to Successful Future Projects! Right time + Right place + Right project! Don t blame the technology!
45 Thank you
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