01031134

Component

https://doi.org/10.3141/1946-14

http://scholar.google.com...ison&publication_year=2006

In the mid-1990s, thermal imaging was identified as a technology that might locate segregation in hot-mix paving operations. In 2000, work started in Texas to evaluate the utility of infrared imaging for identifying segregation. Work conducted in Texas verified that temperature differentials did relate to changes in important hot-mix asphalt properties. This early work also showed that temperature differentials greater than 25°F (13.9°C) typically indicated problems in Texas mixes. With confidence in the utility of the technology, and recommended limits for temperature uniformity, Texas recently made substantial progress tailoring thermal data collection technology and data processing capabilities to hot-mix paving operations. The development and application of the current state of the practice for evaluating paving operations with thermal imaging in Texas are presented. The current methodology in Texas uses the Pave-IR system, which consists of a transverse bar with 10 infrared sensors immediately behind the paver, and the Pave-IR software package, which collects and displays the thermal profile in real time as the paving train progresses. In addition to real-time data display, Pave-IR can display in real time whether the paving temperatures fall within user-defined limits and, during paving, Pave-IR can provide a histogram of temperatures every 100 ft (30.5 m). Postprocessing functions in Pave-IR consist of data playback and review, spot temperature display, and creation of a histogram of the placement temperatures for the entire data file.

01031140

English

pp 123-129

2006

Transportation Research Record: Journal of the Transportation Research Board

0309099544

Print

Figures (5) ; Photos (7) ; References (9)

Aggregate segregation; Histograms; Hot mix asphalt; Infrared imagery; Methodology; Paving; Quality control; Real time information; State of the practice; Temperature; Thermal imagery

Texas

Construction; Highways; Materials; I31: Bituminous Binders and Materials; I52: Construction of Pavements and Surfacings

PRP, TRIS, TRB, ATRI

Mar 3 2006 11:00AM

• Accuracy and Precision of Typical Quality Measures
• Comparative Analysis of Field Permeability Testing of Compacted Hot-Mix Ashpalt Pavements: Using Air and Water Permeameters
• Estimating Percent Within Limits for Skewed Populations
• Evaluating Specification Limits
• Evaluation of Superpave Mix Design for Low-Volume Roads in New Jersey
• Evaluation of the Effect of Sampling Location on Laboratory-Measured Quality Control Parameters
• Field Trial of Infrared Joint Heater to Improve Longitudinal Joint Performance in New Hampshire
• Finite Difference Modeling of Misaligned Dowel Bars and Their Effects on Joint Performance
• Mathematical Modeling Procedures for Performance-Related Specifications
• Probabilistic Procedure for Analyzing Construction Pay Adjustment Systems
• Quality Assurance of Hot-Mix Asphalt: Comparison of Contractor Quality Control and Georgia Department of Transportation Data
• Quantification of Risk Cost Associated with Short-Term Warranty-Based Specifications for Pavements
• Quantity-Based Approach to Preliminary Cost Estimates for Highway Projects
• Rational Estimation of Construction Impact on Pavement Performance
• Sample Size Requirements for Seismic and Traditional Testing of Concrete Pavement Strength
• Seismic Testing to Determine Quality of Hot-Mix Asphalt
• Thermal Imaging of Hot-Mix Asphalt Paving Projects in Connecticut
• Visually Improving Construction Contract Administration