Performance Related Specifications for Concrete
Transcript of Performance Related Specifications for Concrete
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SOLVING PROBLEMS OF GLOBAL IMPORTANCE
© 2015 Applied Research Associates, Inc. 1 © 2014 Applied Research Associates, Inc.
SOLVING PROBLEMS OF GLOBAL IMPORTANCE
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101st Annual Transportation Highway Engineering Conference 24 Feb 15
Performance Related Specifications for Concrete
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SOLVING PROBLEMS OF GLOBAL IMPORTANCE
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Specifications have different risk profiles R
isk
100
QC/QA Method
Type of Specification
0 End-Result Performance/
Warranty
Contractor
Owner
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PRS
Warranties 1960 1970 1980 1990 2000 1950 1940 1930
1920 1910
2000
QA Specifications
Method Specifications
Warranties
1970
1935
1915
Construction specifications have evolved
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4
Identify AQCs and Target Values
Establish Performance Criteria
Model ME Performance
Design AQC vs. As-Constructed AQC
Compare As-Built and As-Designed
Pay Factor f(ΔLCC) Time
LCC
,s
Design
Constructed
PAVESPEC
M&R Plan
How PRS Works Planning
Pavement Design
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Pavement Construction, Sampling, and Testing
Incentive and Disincentive Pay
Incorporate Pay Tables Into Specifications & Project Letting
Use Specifications
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PRS applied to larger paving projects
Project would have at least 10 sublots Will be evaluated and determined by Tollway Pay factors will be different by corridor
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Pavement type selection report is the PRS basis
Traffic
Design
Reliability & Performance Criteria
Support conditions
M & R strategies
Costs & other miscellaneous data
7
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Design Life Cycle Cost As-Built Life Cycle Cost
Pavement Life Cycle Cost Model
0 5 10 15 20 25 30 35 40 45 50
$$$
0 10 20 30 40 50
$$$
0 10 20 30 40 50
$$$
0 5 10 15 20 25 30 35 40 45 50
$$$
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First define Acceptance Quality Characteristics
Measureable • More rapid the better
Correlate with performance • Prediction models
Are under contractor’s control • Can be varied on the project
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Five AQCs • Compressive strength • Air • Thickness • Smoothness • Dowel Alignment
Each has • Target • Rejectable level • Maximum level
Acceptance Quality Characteristics (AQCs)
All AQC tests MUST be tested with random sampling
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Levels of Pavement Quality
Target Quality Level (TQL) • At target 100% pay • Near target pay adjustment (incentive/disincentive)
Rejectable Quality Level (RQL)
• Corrective measures required Maximum Quality Level (MQL)
• No further incentive
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Examples of Important Definitions
2,500
3,000
3,500
4,000
4,500
5,000
5,500
6,000
6,500
7,000
1 2 3 4 5 6 7 8 9 10 11 12 13 14 Lot Number
Com
pres
sive
str
engt
h, p
si Maximum Quality Level (MQL)
Rejectable Quality Level (RQL)
Target
15
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Examples of Important Definitions
2,500
3,000
3,500
4,000
4,500
5,000
5,500
6,000
6,500
7,000
1 2 3 4 5 6 7 8 9 10 11 12 13 14 Lot Number
Com
pres
sive
str
engt
h, p
si
80
85
90
95
100
105
110
Strength pay factor, percent
Maximum Quality Level (MQL)
Rejectable Quality Level (RQL)
Target
15
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Lots and Sublots
Lot: All mainline concrete
Sublot: Division of a lot for testing and sampling • One lane wide and ~1,000 ft. long (Generally 700 – 1,300 ft.) • Provisions for pavement blockout
• Access areas, bridge approach, ramp transition, etc.
Sublot limits marked on plans (by lane)
Payment is made on lot basis
Rejection is made on sublot basis
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Random sampling is a key requirement
Every sublot has equal weight Random number generator to determine sample location Random locations determined before each paving day
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Non-conforming Materials - revised
If RQL not met, contractor to develop Corrective Action Plan No incentive/disincentive for a sublot with non-conforming materials. Accept or reject concrete on a sublot basis.
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28-Day Compressive Strength
Test with cylinders (Illinois Modified AASHTO T22, T23)
• Process described in IDOT Article 1020.09 Strength Tests
• 6”x12” cylinders only Two cylinders per sublot
Level Mean (psi) Std. Dev. (psi) Target 5,500 500
Rejectable 4,000 - Maximum 6,500 -
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Strength pay factor curve
85
90
95
100
105
4,000 4,500 5,000 5,500 6,000 6,500
Pay
Fact
or, %
28-Day Compressive Strength, psi
Std. Dev. = 500 psi
Std. Dev. = 1,000 psi
Std. Dev. = 0 psi
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Air Content
Test with pressure meter according to IDOT Article 1020.08 Air Content
Computed from average of four tests per sublot
• Same samples used for strength cylinders + 3 others
Level Mean Content (%)
Standard Deviation (%)
Target 6.5 0.5 Rejectable 5.0 - Maximum 9.0 -
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Air content pay factor curve
85
90
95
100
105
5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0
Pay
Fact
or, %
Entrained Air Content, %
Std. Dev. = 0.5Std. Dev. = 1.0Std. Dev. = 0
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Slab Thickness
Test with MIT-Scan T2 meter as described by user manual
• Random pre-determined locations Computed from average of four measurements per sublot
Level Mean (in.) Std. Dev. (in)
Target Plan thickness 0.25 Rejectable Plan thickness - 0.5 - Maximum Plan thickness + 1.0 -
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SOLVING PROBLEMS OF GLOBAL IMPORTANCE
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Slab thickness pay factor curve
85
90
95
100
105
12.50 12.75 13.00 13.25 13.50 13.75 14.00
Pay
Fact
or, %
PCC Thickness, in
Std. Dev. = 0.25 inStd. Dev. = 0.50 inStd. Dev. = 0 in
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Smoothness (IRI)
Test in accordance with ASTM E950 • Class I inertial profiler
Test and report each wheel path
Computed from average of wheel paths
Level Mean (in./mile) Std. Dev. (in./mile) Target 60.0 10.0
Rejectable 80.0 - Maximum 50.0 -
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SOLVING PROBLEMS OF GLOBAL IMPORTANCE
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Smoothness pay factor curve
85
90
95
100
105
50 55 60 65 70 75 80
Pay
Fact
or, %
IRI, in/mi
Std. Dev. = 10 in/miStd. Dev. = 20 in/miStd. Dev. = 0 in/mi
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SOLVING PROBLEMS OF GLOBAL IMPORTANCE
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Effective Dowel Diameter (EDD)
Test with MIT-Scan 2
Calculate EDD as described in NCHRP Report 637
Averages of five consecutive joints
Rejection on individual alignment criteria
Process control separate of PRS
Level Mean (in.) Std. Dev. (in.) Target 1.50 N/A
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Effective dowel diameter pay factor curve
85.0
90.0
95.0
100.0
105.0
1.35 1.40 1.45 1.50
Pay
Fact
or, %
Effective Dowel Diameter, in
Std. Dev. NA
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PRS Example Project
3 random Lots selected Tested For
• 28 Day Compressive Strength • Slab Thickness • Air Content • Smoothness • Effective Dowel Diameter
Individual and Composite Pay Factors (PF) calculated
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28-day Compressive Strength - Proposed
3,500 4,000 4,500 5,000 5,500 6,000 6,500 7,000 7,500
Lot 1
Lot 2
Lot 3
28-day Compressive Strength, psi
RQL Target MQL
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SOLVING PROBLEMS OF GLOBAL IMPORTANCE
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Air content example
4.00 4.50 5.00 5.50 6.00 6.50 7.00 7.50 8.00 8.50
Lot 1
Lot 2
Lot 3
Air Content, percent
RQL Target MQL
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Slab thickness example
10.00 10.25 10.50 10.75 11.00 11.25 11.50 11.75 12.00 12.25
Lot 1
Lot 2
Lot 3
Slab Thickness, in
RQL Design MQL
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Smoothness example
40.00 50.00 60.00 70.00 80.00 90.00 100.00
Lot 1
Lot 2
Lot 3
Initial IRI, in/mi
RQL Target MQL
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Effective dowel diameter example
1.10 1.20 1.30 1.40 1.50
Lot 1
Lot 2
Lot 3
Effective Dowel Diameter, in
Target
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Lot Composite Pay Factors
Maximum Composite PF: 105% Minimum Composite PF: 85%*
100100100100100100
⋅
⋅
⋅
⋅
= dowelsmththkairstr
lotPFPFPFPFPFPF
*Provided AQCs meet the RQL standards
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PRS Evaluation for 2013 projects
Using Example PRS • Maximum pay – 105.3% • Minimum pay 93.3% • Average pay – 99%
We are achieving this quality
level with current practice!
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Spreadsheet to track PRS data
Will calculate pay factors even with partial data
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SOLVING PROBLEMS OF GLOBAL IMPORTANCE
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Performance-Related Specifications (PRS) benefit Tollway, consultants, and contractors
Pavement design basis for construction performance
Incentives and disincentives based on LCCA
Contractors can innovative be competitive
No long-term monitoring and management
Testing focuses on key characteristics
• Measureable • Related to performance
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Thank You
William R. Vavrik, Ph.D., P.E. Vice President & Principal Engineer Applied Research Associates, Inc. 100 Trade Centre Dr., Ste 200. Champaign, IL 61820 (217) 356-4500 [email protected]