# Presentation: 920889

## Getting to Know 

- Getting to Know

- The Long Term Pavement Performance Program

**Notes:**

It is a pleasure to be here and tell you about LTPP.  I am (insert name and title).

## PRESENTATION OBJECTIVES

-  LTPP Partnership
-  LTPP Products

- Program:  What It’s About

**Notes:**
This presentation is organized around three topical areas:
 information about LTPP -- its origins, structure, and operation
 the partnership that makes the program possible
 and, the products --the tools, procedures, and guidelines that were developed by the program, have been tested, and are ready for use.
So, let’s begin with some background on LTPP.

## LTPP Development

-  Strategic Transportation Research Study
-  LTPP Planning
-  Strategic Highway Research Program
-       (LTPP: $50 Million)

- 1987-1992

- 1985-1987

- 1984

**Notes:**
In 1984, the Strategic Transportation Research Study was initiated.  Its focus was to develop a research agenda that would produce major innovations for increasing the productivity and safety of the Nation’s highway system.  One component of this effort was the Long Term Pavement Performance (LTPP) program -- a 20 year study of in-service highway pavements.  

Planning for the LTPP program began in 1985. It was a cooperative effort of American Association of State and Highway Transportation Officials (AASHTO), the National Cooperative Highway Research program (NCHRP), the Transportation Research Board (TRB), and the Federal Highway Administration (FHWA).  In 1987 with the passage of the Surface Transportation Assistance Act,  LTPP was launched as part of the Strategic Highway Research Program (SHRP).

## Original Objectives

- Evaluate existing design methods.
- Develop improved design methodologies and strategies for the rehabilitation of existing pavements.
- Develop improved design equations for new and reconstructed pavements.
- Determine the effects of loading, environment, material properties and variability, construction quality, and maintenance levels on pavement distress and performance.
- Determine the effects of specific design features on pavement performance.
- Establish a national long-term database to support SHRP’s objectives and to meet the future needs of the highway industry.

**Notes:**
These were the original objectives of the program.  They were developed by the LTPP Technical Advisory Committee, which was composed of approximately 35 individuals from the States, industry, academia, and FHWA.

## General Pavement Studies (GPS)

- GPS-1
- GPS-2
- GPS-3
- GPS-4
- GPS-5
- GPS-6A
- GPS-6B
- GPS-7A

- Asphalt Concrete (AC) on Granular Base
- AC on Bound Base
- Jointed Plain Concrete Pavement
- Jointed Reinforced Concrete Pavement
- Continuously Reinforced Concrete Pavement
- Existing AC Overlay on AC Pavements
- New AC Overlay on AC Pavements
- Existing AC Overlay on Portland Cement Concrete (PCC) Pavements
- New AC Overlay on PCC Pavements
- Unbounded PCC Overlays on PCC Pavements

- GPS-7B
- GPS-9

**Notes:**
To support these objectives, two types of studies were established.  The first type -- the General Pavement Studies (GPS) --  focus on the most commonly used structural designs for pavement.

## General Pavement Studies (GPS)

- Focus on most commonly used pavement designs
- Experimental design: full factorial
- One 500 foot section per location

- _Primary Factors_
- Subgrade:  fine & course
- Traffic:   medium & heavy
- Temp:  freeze and non-freeze
- Moistures: wet and dry

- _Secondary Factors_
- AC thickness
- AC stiffness
- SN of base and subgrade
- PCC thickness
- Joint spacing

**Notes:**
Eight types of existing or in-service pavements -- in either original or rehabilitated condition -- are being monitored throughout North America.  The various factors being looked at include climatic, geologic, maintenance, rehabilitation, traffic, and other service conditions.
GPS sections were selected from existing pavements -- asphalt pavements up to 10 years old and portland cement concrete pavements up to 15 years old.
GPS-6B and 7B are sections for which LTPP was able to do a condition survey prior to the overlay.

## General Pavement Studies (GPS)

- Approximately 800 sections

**Notes:**
There are approximately 800 GPS test sections throughout North America.  Their locations are shown on the map.

## Specific Pavement Studies (SPS)

- SPS-1

- Strategic Study of Structural Factors for Flexible Pavements
- Strategic Study of Structural Factors for Rigid Pavements
- Preventative Maintenance Effective for Flexible Pavements
- Preventative Maintenance Effective for Rigid Pavements
- Rehabilitation of AC Pavements
- Rehabilitation of Jointed PCC Pavements
- Bonded PCC Overlays on Concrete Pavements
- Study of Environmental Effects in the Absence of Heavy Loads
- Validation of SHRP Asphalt Specification and Mix Design (Superpave)

- SPS-2
- SPS-3
- SPS-4
- SPS-5
- SPS-6
- SPS-7
- SPS-8

- SPS-9

**Notes:**
The second type of study -- the Specific Pavement Studies (SPS) -- have been specifically constructed by the States and Provinces to investigate certain pavement engineering factors. 

## Specific Pavement Studies (SPS)

- Focus on certain pavement engineering factors
- Experimental design: half factorial
- Multiple 500 feet sections per location

- _Primary Factors_
- Subgrade:  fine & course
- Traffic:   medium & heavy
- Temp:  freeze and non-freeze
- Moistures: wet and dry

- _Secondary Factors_
- AC drainage - yes, no
- AC thickness
- AC base type and thickness
- PCCP drainage- yes, no
- PCC strength and thickness
- Lane width
- Base type

**Notes:**
The SPS test sections allow critical design factors to be controlled and performance to be monitored from the initial date of construction.  Results will provide a better understanding of how selected maintenance, rehabilitation, and design factors affect pavement performance.

## Specific Pavement Studies (SPS)

## LTPP’s GOAL

**HOW** and **WHY**

- To provide answers to

- pavements perform as they do!

**Notes:**
Today as when the program began,  LTPP’s goal is provide answers to HOW and WHY pavements perform as they do.

## LTPP’s CORE FUNCTIONS

** **Collect, Process, Store and Provide Readily Accessible, Quality Data

**Notes:**
The LTPP program is organized around several core functions.  The first of which is data collection and management.

##  LTPP:Understanding Pavement Performance

**The Strategic Transportation Research Study recommends creating LTPP as an element of a Strategic Highway Research Program (SHRP).**

**SHRP Research Plan published.  **
**LTPP experimental design established. **
**It involves 2 studies:**
**  ****General Pavement Studies (GPS)**
**  ****Specific Pavement Studies (SPS)**
**developing an LTPP database and an LTPP data analysis effort.**

**Surface Transportation Assistance Act (STAA)**
**funds SHRP and  LTPP.**

**LTPP data collections begins.**

- 1984

- 1986

- 1987

- 1989

**Notes:**
The following is a timeline showing the evolution of the establishment of LTPP.  As you can see, very soon after LTPP was funded under the Surface Transportation Assistance Act of 1987, LTPP data collection started.

## LTPP Data Collection

**Climate**

**Traffic**

**Material**
**Properties**

**Pavement Structure**

**Pavement   condition**

**Notes:**
At each GPS and SPS site, data on distress, roughness, structural capacity, traffic, climate, pavement condition, material properties, and other variables is systematically collected. 

## LTPP Database

- MODULES
-  Climatic
-  General
-  Inventory
-  Maintenance
-  Monitoring
-  Rehabilitation
-  SMP
-  SPS (10)
-  Traffic

- TABLES
-  Deflection
-  Profile
-  Friction
-  Distress
-  etc

- ELEMENTS
-  Date
-  Time
-  Temperature
-  Individual data
-       elements

-  9 gigabytes of data in the Database
-  20 gigabytes of data is off line

**Notes:**
This information has been used to construct a comprehensive database that is the most comprehensive source of site-specific information on pavement performance in the world.  

## LTPP’s CORE FUNCTIONS

- Data Collection and Management

**Data Analysis**
**> **Understand Pavement Performance

**Notes:**
Data collection and management, however, is of limited value.  To derive benefit from this data, engineers must analyze it.  LTPP’s data analysis effort takes the raw data that is collected from over 2400 pavement test sections throughout North America and converts it into useable information.  Information that highway engineers and managers can use in their day to day operations.

## LTPP:  Data Analysis  

**SHRP analysis begins.**

**First public release of data from LTPP database.**

**ISTEA funds continuation of LTPP.**
**Research phase of SHRP ends.**
**Management of LTPP moves to FHWA.**

**SHRP-LTPP analysis reports reports published.**

**First FHWA-LTPP analysis reports published.**
**AASHTO adopts LTPP-verified improved design procedures for **
**jointed concrete pavements.**

- 1990

- 1991

- 1992

- 1994

- 1997

**FHWA-LTPP analysis begins.**

**Notes:**
Again the timeline history of LTPP illustrates the initiation of data analysis beginning first under the Strategic Highway Research Program in 1990, and continuing under LTPP.  

## Purpose of Data Analysis

- Quantify how pavements perform
- Understand why they perform as they do
- Validate and calibrate existing procedures
- Develop new procedures
- Provide quality control of data

**Notes:**
LTPP data analysis provides the value-add to the data collected.
Analysis helps explain how pavements perform and why they perform as they do. 
Analysis also helps to validate and calibrate existing procedures, to develop new procedures
It provides quality control of the data.

## Types of Data Analysis Done

- Studies of variability in traffic, materials and performance data
- Development of improved design procedures
- Comparison of pavement performance
- Field validation of pavement design procedures
- ASCE-LTPP data analysis contest

**Notes:**
Over the years, LTPP analysis has:
 provided studies of the variability in traffic, materials, and performance data
 comparison of pavement performance
 improved design procedures
 provided field validation of pavement design procedures.

## Strategic Analysis Plan Objectives

**Traffic **characterization and prediction
**Materials** characterization
- Determination of **environmental effects** in pavement design and performance prediction
- Evaluation and use of **pavement condition data** in pavement management
-  Development of pavement response and **performance models** applicable to pavement design and performance prediction
- Maintenance and rehabilitation **strategy selection** and performance prediction
- Quantification of the performance impact of specific **design features**

## LTPP’s CORE FUNCTIONS

- Data Collection and Management
- Data Analysis

**Product Development**
-  Develop and Deliver Usable Tools

**Notes:**
LTPP has also been busy translating the data and analysis into developing products that would be useful to the pavement design engineer.

## LTPP  Products

- 1998

- 1999

**Several LTPP products released: **
** ****DataPave,**
** ****LTPPBind,**
** ****Rigid Pavement Design Software, **
** ****FWD and Resilient Modulus Videotapes.**

- 1996

** ****FHWA-LTPP product implementation efforts launched via**
**    ****Product Preview and the appointment of a**
**    ****formal implementation team.**

* ***New versions of  DataPave and LTPPBind released.**

**NCHRP product development projects.**

**Notes:**
In the late 1990s, LTPP began releasing several products aimed at improving the long term performance of pavements. 
To aid its product development efforts a TRB-LTPP subcommittee was formed in 1999.  The committee has developed:
 a mission statement 
 a product development process
and
 identified specific product projects for 2001.

## LTPP’s Role in the 2002 Guide

- Validation and Calibration
- Material Characterization
- LTPP soil Mr test procedure
- Source of typical values
- Environmental Effects
- Source of climatic data
- Evaluation of Existing Pavements
- LTPP’s backcalculation procedure
- FWD calibration procedures

**Notes:**
LTPP is also playing a critical role in the development and use of the 2002 Design Guide now under development in NCHRP 1-37A.

LTPP data will be used in a two stage process of validation and calibration.

LTPP data and procedures play an integral part of a functioning Guide.

LTPP data makes the Guide possible.

## LTPP’s CORE FUNCTIONS

- Data Collection and Management
- Data Analysis
- Product Development

**Communication**
- Ensure Access to LTPP Program Information

**Notes:**
The final core function of LTPP is communication. 
 LTPP recognizes the need to ensure that its partners and the highway community in general have access to the best and latest knowledge resulting from LTPP.

## Communication Tools

- Meetings
- Workshops/Contests

-   Publications
- Brochures
- TechBriefs
- Product Briefs
-  Research Reports
-  Videos

-  Website

**Notes:**
Meetings continue to be an effective communication tool.  FHWA-LTPP staff and contractors make presentations at various industry, trade association and government meetings and through LTPP Regional meetings all over the country.
In addition LTPP publishes:
 Research Reports that document FHWA-sponsored analysis of LTPP data.
 TechBriefs that provide concise summaries of recent LTPP data analysis projects.
 Product Briefs that provide an overview of LTPP products.
 Brochures such as LTPP: The Next Decade, LTPP Analysis: Putting the Data to Work, and LTPP’s Year in Review.
LTPP also has at various times conducted workshops, sponsored data analysis contests, and worked with its partners to develop videos on key technical topics.
AND DON’T FORGET OUR WEBSITE.  It has all the most up to date information on LTPP.  

## PRESENTATION OBJECTIVES

-  LTPP Program
-  LTPP Products

- Partnership: Who and What

**Notes:**
It is important to recognize that LTPP is a partnership.

## The Partners 

***LTPP***
***Partners***

**State**
**Highway**
**Agencies**

**Provincial**
**Highway**
**Agencies**

**American**
**Association of**
**State & Highway**
**Transportation**
**Officials**

**Transportation**
**Research**
**Board**

**Canadian**
**Strategic**
**Highway**
**Research**
**Program**

**Federal**
**Highway**
**Administration**

**Notes:**
LTPP  partners are:  
-- Federal Highway Administration
-- State and Provincial Highway Agencies
-- the Canadian Strategic Highway Research Program
-- the American Association of State and Highway Transportation Officials 
-- the Transportation Research Board

[Stage Direction . . . Read the list in the order given, as it is the order in which they pop up]

##  The LTPP Partners At Work

** ****Data **
**Management**
**& Communication**

**Program**
**Management**

**Test Sections**

**Implementation**

**Data Collection**

**Analysis**

**Product Development &**
**Delivery**

**FHWA**

**States & Provinces**

** ****TRB-LTPP Committee**
** ****TRB-LTPP Subcommittees**
** ****Expert Task Groups**

**TRB**

** ****Task Force on SHRP Implementation**
** ****Joint Task Force on Pavements**
** ****Subcommittee on Materials**
** ****Funding, NCHRP**

**AASHTO**

**Notes:**
In this partnership:  FHWA manages the data-to-day operations of LTPP.  This includes the collection, processing, and dissemination of data; national analysis activities; and product development and delivery activities.
The States and Provinces are both owners and customers of the program.  As owners they have made significant investments in the program by designating test sites, constructing and monitoring test sections, supplying test materials, and collecting traffic and other data at the test sites.  As customers of the program, the States and Provinces are the primary users of the results garnered from the program.
From test section recruitment to the adoption of LTPP-developed methods, procedures, and guidelines as standards for pavement engineering, AASHTO has provided the collective leadership for many of the program’s successes to date.
TRB operates several committees that provide input and advice on LTPP’s research and implementation activities.

## PRESENTATION OBJECTIVES

-  LTPP Program
-  LTPP Partnership

- Products

**Notes:**
Over the years LTPP has developed standards for materials testing, pavement monitoring, and equipment in addition to calibration procedures.  More recently, LTPP has developed several new products.  These include. . .  (next slide). 

## DavePave: User-Friendly Access to LTPP Data

*What:*

-    CD-ROM with most of the data from LTPP experiments.
-    Provides users with all the tools needed to examine and work with the data.
-    State/Provincial highway agencies
-    Industry
-    Academia
-    Highway-related agencies (AASHTO, FHWA, TRB)

*Capabilities:*

*Who Should Use:*

**Notes:**
DataPave is a simple, user-friendly software package that contains most of the data currently available from the LTPP experiments on two CD-ROMs.  

In addition to the actual data, DataPave also provides users with all the tools needed to examine and work with the data.

## LTPPBind: Selection of Cost-Effective Superpave Asphalt Binder Performance Grades

-    Software to aid selection of Superpave PG for a particular site.
-    Provides users with a tool to select binder grades that are less restrictive, more cost-effective, and meet Superpave PG concepts
-    State/Provincial highway agencies
-    Pavement Engineers

*What:*

*Capabilities:*

*Who Should Use:*

**Notes:**
LTPPBind is a software tool that aids highway agencies with their selection of the most suitable and cost-effective Superpave PG for a particular site. 

LTPPBind allows the user to determine the reliability and risk associated with a binder grade.

## Rigid Pavement Design Software

-    Microsoft Excel spreadsheet
-    Automates design and analysis procedures in the 1998 AASHTO supplement
-    State/Provincial highway agencies
-    Pavement engineers

*What:*

*Capabilities:*

*Who Should Use:*

**Notes:**
Rigid Pavement Design software is a Microsoft Excel spreadsheet that automates the design and analysis procedures in the 1998 AASHTO supplement for rigid pavement design and rigid pavement joint design.
Training on the use of the ‘98 supplement is available through the National Highway Institute.  The course is entitled “Concrete pavement Design Details & Construction Practices” and the course number is 13160.

## FWD Calibration Videotape

-    15 minute videotape titled
- “Working With Your FWD Calibration Center”
-     Addresses key questions about FWD calibration
-     Provides step by step guide
-    FWD operators

*What:*

*Capabilities:*

*Who Should Use:*

**Notes:**
The FWD videotape addresses key questions about FWD calibration for FWD operators, highway administrators, and engineers.

## Resilient Modulus Lab Tests Videotapes

-     3 videotapes
-     Explains the how and why of LTPP revised resilient modulus laboratory tests
-     Highway Administrators
-     Engineers
-     Laboratory Managers and Technicians

*What:*

*Capabilities:*

*Who Should Use:*

**Notes:**
This series of videotapes address key questions about the revised resilient modulus laboratory tests and procedures.  They are geared to highway administrators, engineers, laboratory managers, and technicians.

## Pavement Maintenance and Repair Manuals

-     4 manuals
-     Provides latest information on pavement maintenance and repair
-     Supervisors and Foremen of Repair Ops
-     Engineers Responsible for
-         Planning/Overseeing Repair Ops
-     Managers Responsible for Setting Repair
-         Policies and Standards

*What:*

*Capabilities:*

*Who Should Use:*

**Notes:**
These manuals are revisions of the 1993 SHRP manuals.  LTPP has updated them with the latest information on pavement maintenance and repair.

## LTPP on the Web

**www.tfhrc.gov/ltpp.htm**

- Connect to LTPP Webpage through

**Notes:**
That covers the basics regarding the LTPP program.  I’d like to thank you for your time.  And remember that if you have any other questions or need more information -- just check us out on the WEB.
The address is:  WWW.TFHRC.GOV