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Publication Number:  FHWA-HRT-16-007    Date:  January 2016
Publication Number: FHWA-HRT-16-007
Date: January 2016

 

Long-Term Bridge Performance (LTBP) Program Protocols, Version 1

Legacy Data Mining Protocols (LD)

PRE-ED-LD-001, Legacy Data Mining for Untreated Bridge Decks

Long-Term Bridge Performance Program Logo

Legacy Data Mining for Untreated Bridge Decks
LTBP Protocol #: PRE-ED-LD-001

1.

Data Collected

  
1.1 Analyzed quantitative data and other descriptive information gathered from the analysis of legacy data for the bridge.  

2.

Onsite Equipment and Personnel Requirements

  
2.1 Equipment: Computer.  
2.2 Personnel: PRE-PL-LO-005, Personnel Qualifications.  

3.

Methodology

  
3.1 Calculate the following parameters from the data obtained from the Bridge Documentation Protocols (PRE-ED-BD-001, Plans and Specifications for Bridge Design and Construction; PRE‑ED-BD-002, Bridge Construction Records):  
3.1.1 Moment of inertia of noncomposite section.  
3.1.2 Moment of inertia of composite section (if applicable).  
3.1.3 Stiffness of superstructure.  
3.1.4 Load distribution factor.  
3.1.5 If data is available on the temperature, the relative humidity, and the wind speed at deck level at the time the deck was poured, use these data to estimate of the rate of evaporation.  
3.2 Perform the following analyses using the National Bridge Inventory (NBI) Condition Ratings for the bridge, the data obtained from the Bridge Documentation Protocols (PRE-ED-BD-001, Plans and Specifications for Bridge Design and Construction; PRE‑ED‑BD-002, Bridge Construction Records; PRE-ED-BD-004, Bridge Site Conditions; PRE‑ED‑BD‑005, Bridge Inspection Records) for the bridge, and the parameters calculated in section 3.1 above, to see if there is any correlation between them and the following:  
3.2.1 Time to NBI ratings for decks:  
3.2.1.1 Age when the deck first reached NBI rating 8.

NOTE—For States using the NBI translator to calculate NBI ratings, it will be necessary to estimate the age when the deck reaches a rating of 8.		  
3.2.1.2 Age when deck first reached NBI rating 7.  
3.2.1.3 Age when deck first reached NBI rating 6.  
3.2.1.4 Age when deck first reached NBI rating 5.  
3.2.1.5 Age when deck first reached NBI rating 4.  
3.2.1.6 Age when deck first reached NBI rating 3.  
3.2.2 Time between NBI ratings for decks:  
3.2.2.1 NBI rating 8 to NBI rating 7.  
3.2.2.2 NBI rating 7 to NBI rating 6.  
3.2.2.3 NBI rating 6 to NBI rating 5.  
3.2.2.4 NBI rating 5 to NBI rating 4.  
3.2.2.5 NBI rating 4 to NBI rating 3.  
3.3 If possible, determine any correlation between the NBI rating of the deck and the following:  
3.3.1 Crack density of deck.  
3.3.2 Age and the following deck types:  
3.3.2.1 Monolithic cast-in-place.  
3.3.2.2 Precast subdeck panels with concrete topping.  
3.3.2.3 Precast full-depth deck panels.  
3.3.3 Moment of inertia of composite section.  
3.3.4 Age, girder type, and girder material.  
3.3.5 Age and permeability of deck.  
3.3.6 Age and water-to-cement (w/c) materials ratio of deck.  
3.3.7 Age and presence of the following supplementary cementitious materials in deck:  
3.3.7.1 Fly ash.  
3.3.7.2 Silica fume.  
3.3.7.3 Slag.  
3.3.7.4 Metakaolin.  
3.3.8 Cement content.  
3.3.9 Type of cement:  
3.3.9.1 Type I.  
3.3.9.2 Type II.  
3.3.9.3 Type III.  
3.3.9.4 Type IV (if applicable).  
3.3.9.5 Type V (if applicable).  
3.3.10 Water content with and without use of a superplasticizer.  
3.3.11 Volume of paste per cubic yard (cement content plus water content).  
3.3.12 Coarse aggregate type.  
3.3.13 Percentage of air entrainment:  
3.3.13.1 Specified.  
3.3.13.2 Actual.  
3.3.14 Concrete compressive strength at the following ages:  
3.3.14.1 1 day  
3.3.14.2 28 days  
3.3.15 Size and spacing of reinforcing bars in top mat.  
3.3.16 Size and spacing of reinforcing bars in bottom mat.  
3.3.17 Grade and the following types of reinforcing bars in top mat:  
3.3.17.1 Black bars.  
3.3.17.2 Epoxy-coated bars.  
3.3.17.3 Stainless steel bars.  
3.3.17.4 Stainless-clad bars.  
3.3.17.5 Grade 40 yield strength bars.  
3.3.17.6 Grade 60 yield strength bars.  
3.3.18 Grade and the following types of reinforcing bars in bottom mat:  
3.3.18.1 Black bars.  
3.3.18.2 Epoxy coated bars.  
3.3.18.3 Stainless steel bars.  
3.3.18.4 Stainless-clad bars.  
3.3.18.5 Grade 40 yield strength bars.  
3.3.18.6 Grade 60 yield strength bars.  
3.3.19 The following weather factors at time of deck construction:  
3.3.19.1 Season when constructed.  
3.3.19.2 Mean ambient temperature.  
3.3.19.3 Wind speed.  
3.3.19.4 Estimate of evaporation rate.  
3.3.20 The following age groups and changes in materials specifications (and cement changes, including fineness of cement):  
3.3.20.1 1970–1975.  
3.3.20.2 1975–1980.  
3.3.20.3 1980–1985.  
3.3.20.4 1985–1990.  
3.3.20.5 1990–1995.  
3.3.20.6 1995–2000.  
3.3.20.7 2000–2005.  
3.3.20.8 2005–2010.  
3.3.21 Deck placement technique used by the contractor, such as the following:  
3.3.21.1 Bucket.  
3.3.21.2 Pumping.  
3.3.22 Deck finishing technique used by the contractor, such as the following:  
3.3.22.1 Manual with hand-held vibrators.  
3.3.22.2 Roller screeds.  
3.3.22.3 Vibrating screeds.  
3.3.22.4 Tining.  
3.3.22.5 Sawcut grooving.  
3.3.23 Slump, including:  
3.3.23.1 Specified slump.  
3.3.23.2 Actual measured slump.  
3.3.24 The curing method used by the contractor, including:  
3.3.24.1 Sprinkler and burlap.  
3.3.24.2 Fogging.  
3.3.24.3 Curing compound.  
3.3.24.4 Wet burlap.  
3.3.24.5 Plastic sheets.  
3.3.25 Length of curing period.  
3.3.26 Time of initiation of wet curing.  
3.3.27 Age and clear cover of top mat of reinforcement in deck.  
3.3.28 Girder spacing.  
3.3.29 Girder type, material, and spacing.  
3.3.30 Girder end condition:  
3.3.30.1 Fixed.  
3.3.30.2 Allows translation only.  
3.3.30.3 Allows rotation only.  
3.3.31 Integral or semi-integral abutments.  
3.3.32 Superstructure stiffness.  
3.3.33 Span length.  
3.3.34 Average daily truck traffic.  
3.3.35 Amount and type of anti-icing agent applied to the deck at each of the following intervals:  
3.3.35.1 Week.  
3.3.35.2 Month.  
3.3.35.3 Winter season.  
3.3.36 Slope of deck surface:  
3.3.36.1 Longitudinal slope.  
3.3.36.2 Cross slope.  
3.3.37 Number and spacing of deck joints (if any).  
3.3.38 The type of deck joints.  
3.3.39 The condition of deck joints, including water tightness.  
3.3.40 Number of scuppers.  
3.3.41 Condition of scuppers.  
3.3.42 Locations of scuppers.  
3.3.43 The frequency of the following maintenance/preservation activities:  
3.3.43.1 Bridge washing.  
3.3.43.2 Cleaning joints.  
3.3.43.3 Cleaning scuppers.  
3.4 Write a summary report describing the analyses and findings from sections 3.1, 3.2, and 3.3, and upload it into the LTBP Bridge Portal.  
3.5 Storing data, documents, and images:  
3.5.1 FLD-DS-LS-001, Data, Document, and Image Storage—Local, for local storage.  
3.5.2 FLD-DS-RS-001, Data, Document, and Image Storage—Remote, for remote storage.  
3.6 Reporting: Transfer all metadata, data, documents, and images to FHWA, and/or upload all metadata, data, documents, and images into the LTBP Bridge Portal.  

4.

Data Collection Table

  
4.1 Table:  
# Field Name Data Type Accuracy Unit Field Description Row Color
1 Protocol name
Text
 
 
 Title of the protocol
Green
2 Protocol version
Text
Month and year
 
 Month and year the protocol version was published; e.g., May 2015
Green
3 Contractor or agency performing the legacy data mining
Text
 
 
 Name of contractor, university, State agency, or Federal agency performing the legacy data mining.
Green
4 Personnel performing legacy data mining
Text
 
 
 First name(s) Last name(s)
Green
5 Title of legacy data mining report
Text
 
 
 e.g., Legacy Data Mining Report for Untreated Bridge Decks—LTBP Mid‑Atlantic Cluster
Green
6 Date legacy data mining completed
Text
Exact date
 
 mm/dd/yyyy
Green
7 Clusters and/or corridors covered by the legacy data mining report
Text
 
 
 e.g., LTBP Mid-Atlantic Cluster
Yellow
8 Legacy data mining report
BLOB
 
 
 Microsoft® Word file
Yellow
9 Comments
Text
 
 
  
Orange
4.2 Table Key  
Column Descriptions
#
 Sequential number of data item
Field Name
 Data field name
Data Type
 Type of data, such as text, number, predefined list, binary large object (BLOB), or PDF file
Accuracy
 Accuracy to which the data are recorded
Unit
 Unit in which a measurement is taken and recorded
Field Description
 Commentary on the data or list of items in a predefined list
Row Color Key
Green
 Data items only entered once for each protocol for each day the protocol is applied
Pink
 Logical breakdown of data by elements or defect types (not always used)
Blue
 Data identifying the element being evaluated or the type of defect being identified
Yellow
 LTBP data reported individually for each element or defect identified
Orange
 Comments on the data collection or data entered

5.

Criteria for Data Validation

  
5.1 None.  

6.

Commentary/Background

  
6.1 This protocol provides guidance on using legacy data for an LTBP bridge to evaluate performance of an untreated bridge deck using structural characteristics, material properties, construction practices, and its condition over time as expressed by the NBI rating.  
6.2 Legacy data includes data from NBI inspections and from documents obtained from the bridge owner about the bridge characteristics, bridge construction practices, the material properties of the bridge and the bridge deck, as well as the condition of the bridge deck.  
6.3 Data about bridges available and accessible without a site visit to the bridge are used to evaluate deterioration trends and answer key performance questions on a large set of bridges. These data are collected using the Bridge Documentation protocols.  

7.

References

  
7.1 LTBP Protocols:  
7.1.1 PRE-ED-BD-001, Plans and Specifications for Bridge Design and Construction.  
7.1.2 PRE-ED-BD-002, Bridge Construction Records.  
7.1.3 PRE-ED-BD-003, Bridge Design and Construction Cost Data.  
7.1.4 PRE-ED-BD-004, Bridge Site Conditions.  
7.1.5 PRE-ED-BD-005, Bridge Inspection Records.  
7.1.6 PRE-ED-BD-006, Bridge Maintenance Records and Cost Data.  
7.1.7 PRE-ED-BD-007, Calculation of Bridge Ratings.  
7.1.8 PRE-PL-LO-005, Personnel Qualifications.  
7.1.9 FLD-DS-LS-001, Data, Document, and Image Storage—Local.  
7.1.10 FLD-DS-RS-001, Data, Document, and Image Storage—Remote.  
7.2 External: None.  

 

 

 

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