Thermal Imaging of Hot-Mix Asphalt Paving Projects in Connecticut

2006 ◽  
Vol 1946 (1) ◽  
pp. 130-138 ◽  
Author(s):  
John W. Henault ◽  
Donald A. Larsen
Keyword(s):  
Thermal Imaging ◽  
Hot Mix Asphalt ◽  
Asphalt Paving

scholarly journals Preparation and characterisation of modified reclaimed asphalt using nanoemulsion acrylate terpolymer

2019 ◽  
Vol 48 (5) ◽  
pp. 363-374 ◽  
Author(s):  
Abdelrahman Moukhtar Naser ◽  
Hamada Abd El - Wahab ◽  
Mohamed Abd El Fattah Moustafa El Nady ◽  
Abdelzaher E.A. Mostafa ◽  
Long Lin ◽  
...  
Keyword(s):  
Hot Mix Asphalt ◽  
Fourier Transforms ◽  
Thermo Gravimetric Analysis ◽  
Thermoplastic Elastomer ◽  
Warm Mix Asphalt ◽  
Gravimetric Analysis ◽  
Content Type ◽  
Reclaimed Asphalt ◽  
Asphalt Paving ◽  
Modified Binder

Purpose This paper aims to investigate the best methods of utilisation of reclaimed asphalt pavements (RAP) in Egypt, to determine the effect of using 100% RAP instead of using virgin aggregates and asphalt; investigate the effect of thermoplastic elastomer polymer as asphalt modifier; and also improve the mechanical and physical characteristics and consequently improving the quality of asphalt paving, increasing service life of asphalt-paving and reducing costs. Design/methodology/approach Nano acrylate terpolymers were prepared with different % (Wt.) of and were characterised by Fourier transforms infrared (FTIR), for molecular weight (Mw), by thermo gravimetric analysis (TGA) and by transmission electron microscopy (TEM). A 4% (Wt.) of the prepared nanoemulsion terpolymer was mixed with virgin asphalt as a polymer modifier, to improve and reuse of the RAP. The modified binder was tested. The tests conducted include penetration, kinematic viscosity, softening point and specific gravity. Application of Marshall mix design types; hot mix asphalt (HMA), warm mix asphalt (WMA) and cold in place recycled (CIR). Four different mix designs used; control mix contained virgin asphalt by HMA, and the other three mix designs were polymermodified asphalt sample by HMA, WMA and CIR. Findings The research results showed that using 4 Wt.% of the prepared nanoemulsion terpolymer to produce hot mix asphalt (HMA) and warm mix asphalt (WMA) achieved higher stability compared to the control mix and cold in place recycled (CIR). Research limitations/implications This paper discusses the preparation and the characterisation of nanoemulsion and its application in RAPs to enhance and improve the RAP quality. Practical implications Nano-acrylate terpolymer can be used as a new polymer to modify asphalt to achieve the required specifications for RAP. Originality/value According to the most recent surveys, Europe produced 265 tonnes of asphalt for road applications in 2014, while the amount of available RAP was more than 50 tonnes. The use of RAP in new blended mixes reduces the need of neat asphalt, making RAP recycling economically attractive.

Current Initiatives in Quality Asphaltic Pavement Construction: The Wisconsin Experience

1996 ◽  
Vol 1543 (1) ◽  
pp. 120-124
Author(s):  
Robert L. Schmitt ◽  
Gary C. Whited ◽  
Gerald J. Waelti ◽  
Awad S. Hanna ◽  
Jeffrey S. Russell ◽  
...  
Keyword(s):  
Quality Assurance ◽  
Quality Management ◽  
Process Control ◽  
Hot Mix Asphalt ◽  
Management Program ◽  
Asphalt Pavements ◽  
Nuclear Density ◽  
Wisconsin Department ◽  
Asphalt Paving ◽  
And Performance

The Wisconsin asphalt-paving industry is undertaking several initiatives to continually improve the construction of asphalt pavements through a quality management program and two piloted specifications. The quality management program provides contractors and the Wisconsin Department of Transportation (WisDOT) with structured process control and quality assurance for hot-mix asphalt paving projects. A warranted pavement specification, piloted on three projects during 1995, warranties the pavement for 5 years and allows greater flexibility for contractors during construction. A statistically based nuclear-density specification will be piloted in 1996 to provide density-process control and quality assurance using nuclear density gauges. These initiatives are moving toward the goal of performance-based construction and are possible with a commitment to quality from WisDOT and contractors, including members of the Wisconsin Asphalt Pavement Association. Members of the industry are combining resources and restructuring to develop and implement methods to improve the quality and performance of hot-mix asphalt pavements. Focus is placed on mutual development of solutions to various problems encountered by the industry.

Hot-Mix Asphalt Segregation: Measurement and Effects

1996 ◽  
Vol 1543 (1) ◽  
pp. 97-105 ◽  
Author(s):  
R. Christopher Williams ◽  
Gary Duncan ◽  
Thomas D. White
Keyword(s):  
Thermal Imaging ◽  
Hot Mix Asphalt ◽  
Field Testing ◽  
Test Method ◽  
Pavement Performance ◽  
Air Voids ◽  
Asphalt Content ◽  
Tracking Device ◽  
Wheel Tracking ◽  
Thermal Imaging Equipment

Segregation of hot-mix asphalt (HMA) has been associated with poor pavement performance. As a result, a nondestructive test method that could quickly identify segregation and be easily included in field testing would be useful to agencies. A study was conducted of four HMA mixtures with five levels of segregation. All levels of segregation for each mix were characterized by gradation, asphalt content, density, and air voids. The segregated mixes were tested with an air permeameter and a nuclear moisture/density gauge. In addition, thermal imaging equipment was field-tested on an existing pavement, at a hot-mix asphalt plant, and at a paving project to determine its overall effectiveness in detecting segregation. Preliminary wheel-tracking tests with the PURWheel tracking device were used to evaluate segregated mixture performance.

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