Download - Presentation on Full Depth Rehabilitation
![Page 1: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/1.jpg)
FDRFull Depth Rehabilitation
By: Donatas Greb, PE Richard Haro HSI Engineering, Inc.
![Page 2: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/2.jpg)
OUTLINE
1. What is FDR?2. Challenges of traditional design3. Benefits of using FDR?
• Low cost• Sustainability• Constructability• Performance
4. Design of FDR5. Construction of FDR 6. Questions & Answers
![Page 3: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/3.jpg)
TYPICAL CALIFORNIA STREET
![Page 4: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/4.jpg)
FDR is a process in which the existing asphalt surface is Pulverized in place and blended with the underlying base, sub-base, and/or subgrade materials, mixed with Portland Cement, and compacted to provide a new stabilized base that is high strength, non-plastic, and less permeable. A new surface course is then applied, which completes the FDR process.
FDR Definition
![Page 5: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/5.jpg)
FDR SHOULD BE USED WHEN:
■ SERIOUSLY DAMAGED PAVEMENT
■ BASE OR SUB-BASE FAILURE
■ PATCHING OVER 15%-20% of PROJECT AREA
■ TRAFFIC LOADING EXCEEDS DESIGN
![Page 6: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/6.jpg)
WHEN TO USE FDR ?
![Page 7: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/7.jpg)
PAVEMENT RECYCLING OPTIONS
Cold In-Place Recycling ( 2 to 9 inches)
(8-10 years design life)
Hot In-Place Recycling ( 0.6 to 4 inches)
(2-4 years design life)
Full-Depth Rehabilitation ( 6 to 18 inches)
(20+ years design life)
![Page 8: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/8.jpg)
BENEFITS
• Increased Strength Spreads Loads
• Bound Base Material Section
• Reduced Moisture Susceptibility
• Faster & Easier to Construct
• Thinner AC Pavement Section
• Longer Pavement Life Cycle
• 30%-50% lower cost
![Page 9: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/9.jpg)
AGGREGATE SHORTAGE CHALLENGE(Caltrans Warning)
“…tremendous amount of aggregate needed…”
“…concern about the availability of aggregate…”
“…encourage the development of new material sources…”
SOLUTION: RECYCLE FIRST
![Page 10: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/10.jpg)
ECONOMIC CHALLENGE
-”Best First Approach” doesn’t address all roads
-Projected funding can not keep up
-Increasing rehab costs
![Page 11: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/11.jpg)
Project ProfileBancroft Avenue, San Leandro2-lane Major Collector, 136,000sft.4” AC over 12” FDR using 5% cement
$4.05/sft. - FDR Cost $7.36/sft. - Traditional Pavement CostHSI Engr’g & Inspection Services Fee= 3% const.
![Page 12: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/12.jpg)
ENVIRONMENTAL & ECONOMIC SAVINGS
FDR VS. REMOVE/REPLACE (50,000 sft. , 12-in Deep )
Number of Trucks Required
Material Required (Tons)
Diesel Fuel Consumed (Gal)
120 Loads Export
146 Loads of Aggregate Import
4 Loads of Cement
3,650 Tons New Aggregate
108 Tons of Cement
3,920 Gallons 480 Gallons
FDR ProcessRemove/ Replace Process
![Page 13: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/13.jpg)
ENVIRONMENTAL SAVINGS
1 Cement Truck =
40 Gravel Trucks
![Page 14: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/14.jpg)
IMPROVED LOAD DISBURSEMENT
100 psi 100 psi
20 psi
NON-STABILIZED BASE STABILIZED BASE
5 psi
Stabilized Bound Base
Non-Stabilized Unbound Base
![Page 15: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/15.jpg)
FDR CREATES AN “Inverted Pavement”
![Page 16: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/16.jpg)
NON-STABILIZED BASE STABILIZED BASE
LANDSCAPE AREAMOISTURE INFLUENCE ON PAVEMENT SECTIONS
Moisture infiltrates base:
• High water table • Trench leaching• Landscape irrigation• Capillary action
Stabilization:
• Reduces Permeability • Reduces moisture influences• Maintains strength and stiffness
MAINTAINS PERFORMANCE UNDER SATURATED CONDITIONS
![Page 17: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/17.jpg)
LOCAL FDR CLIENTS
Public Works Projects
City of San Leandro City of Oakland City of Santa Clara City of Marysville City of Hayward City of San Carlos City of Watsonville Yolo County City of Tracy Santa Cruz County
Private Projects
Stockton Lockeford Port of Oakland Campbell Palo Alto Dublin Mountain View Gilroy San Jose Pleasanton Hayward San Benito Carmel Valley San Mateo County Danville San Carlos
![Page 18: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/18.jpg)
HSI FDR SERVICES
1. Coring/Sampling 2. Lab Analysis3. Mix Design4. Strength Determination5. Contract Documents6. Construction Inspection /
Support
![Page 19: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/19.jpg)
FDR DESIGN
A standardized structural value is given to the stabilized base:
Caltrans Design Equation:
Gf = 0.9 + (UCCS/1000) UCCS in psi
Minimum Unconfined Strength = 300 psi
Minimum Thickness = 10 inches
Maximum Thickness = 18 inches
“Making a Better Aggregate Base”
![Page 20: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/20.jpg)
1. CORING / SAMPLING
![Page 21: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/21.jpg)
2. LAB ANALYSIS 3. MIX DESIGN
Determine moisture density relationships (ASTM D1557)
Add between 3 to 7 percent cement
Prepare Unconfined Compressive Strength (UCCS) test samples
![Page 22: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/22.jpg)
4. STRENGTH DETERMINATION
UCS Testing per ASTM D1633 (Method A)7-day strength targets from 300 psi to 650 psiUse accelerated cureTest performance (durability) in wet-dry
environments
![Page 23: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/23.jpg)
5. CONTRACT DOCUMENTS
![Page 24: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/24.jpg)
REMEMBER! - FDR IS A FLEXIBLE PAVEMENT
300 psi = Gf 1.2
Typical Strength Curves for Cement Treated Bases and Soils
![Page 25: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/25.jpg)
FDR CONSTRUCTION STEPS
1. Pulverize 2. Regrade / Shape3. Spread cement4. Mix & Hydrate5. Compact6. Apply Surface
![Page 26: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/26.jpg)
1. Before Full-Depth Rehabilitation 2. Pulverize Pavement 3. Re-Shape Grade
4. Apply Cement 5. Mix & Hydrate Cement 6. Initial Compaction
7. Final Grading 9. Pave FDR8. Final Compaction & Curing
S T A R T
FINISH
THE PROCESS Start to Finish in about 3-5 Days
![Page 27: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/27.jpg)
STEP 1: PULVERIZE
PULVERIZED
SUBGRADE
SUBGRADE
EXISTING BASE
EXISTING BASE
![Page 28: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/28.jpg)
RE-ESTABLISHING GRADE:
• Allows room for new AC section
• Observe conditions for instability
• Allows for temporary traffic
STEP 2: REGRADING AND SHAPING
SUBGRADE
PULVERIZED
EXISTING BASE
![Page 29: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/29.jpg)
STEP 2: REGRADING AND SHAPING
![Page 30: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/30.jpg)
65% to 80% Recycle In-Place
75% to 100% Recycle In-Place
100% Recycle In-Place
Curb & Gutter Conform to established grades
Remove existing AC to allow for new AC section
Re-establish Crown allows for additional use of recycled material
No grade restraints allows for 100% In-place recycling
IS OFFHAUL REQUIRED?
![Page 31: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/31.jpg)
Spreading of Stabilizer
STEP 3: SPREAD CEMENT
SUBGRADE
PULVERIZED
On-board controls provide for ametered material application.
Mechanical vane spreader allows for uniformdistribution.
![Page 32: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/32.jpg)
STEP 4: MIX & HYDRATE
Complete mixing, hydration and
compaction within 2 hours.
![Page 33: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/33.jpg)
STEP 5: COMPACTION
![Page 34: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/34.jpg)
FINAL GRADING
•Finish grade after initial compaction achieved
•Final Compaction with smooth drum roller
Moisture Cure
• Keeps section from drying
• Allows for continued hydration and even curing
![Page 35: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/35.jpg)
Chip Seal
HMA Overlay
STEP 6: APPLY SURFACE
![Page 36: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/36.jpg)
CONSTRUCTION QUALITY CONTROL
Gradation Moisture Density
Compact between 93% and 95%
modified proctor (ASTM D1557).
Add moisture for Compaction and
moisture for Cement Hydration for
minimal shrinkage.
-100% pass 2-inch sieve-minimum 95% pass 1-
inch sieve, and a minimum of 55% passing
No. 4 sieve
![Page 37: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/37.jpg)
Maximum Density
95% of Maximum
Allowable Moisture Range @ 95%
Optimum Moisture
Moisture Content Relationships
Required Moisture for Cement Hydration @ 2 cement to 1 water Relationship
Cement - Allow for cement hydration prior to compacting (Approx.. 30 min from final mixing)
Optimum Cure Moisture Range
MOISTURE CONSIDERATION
![Page 38: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/38.jpg)
HSI ENGINEERING INC. SERVICES
• VALUE ENGINEERING
• EVALUATION OF EXISTING PAVEMENTS
• ASSESSING REHABILITATION OPTIONS
• ENGINEERING AND DESIGN
• FORENSICS, REFEREE TESTING
• INSPECTION & QUALITY CONTROL
![Page 39: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/39.jpg)
ALTERNATIVES
![Page 40: Presentation on Full Depth Rehabilitation](https://reader038.vdocument.in/reader038/viewer/2022103001/557d2b98d8b42a5a448b4fad/html5/thumbnails/40.jpg)
FULL-DEPTH REHABILITATION
SOLUTIONS IN CEMENT STABILIZATION
QUESTIONS ?
www.fulldepthrehabilitation.com