Influence of Warm Mix Asphalt on Aging of Asphalt Binders

physical, chemical, and morphological properties using the same test procedures as the laboratory-produced foamed WMA and HMA mixtures. 17. Key Words Warm mix asphalt, Hot mix asphalt, Aging, Dynamic shear rheometer, Fourier-transform infrared spectroscopy, Gel permeation chromatography. 18. Distribution Statement No restrictions.

Learn More

Viscosity-temperature characteristics of warm mix asphalt

Two matrix asphalt binders are used to prepare warm mix asphalt (WMA) binders with different dosages of Sasobit® additive, and the general technical properties, the dynamic viscosities at 60 °C, the apparent viscosities above 110 °C are measured and analyzed.It is found that the apparent viscosity exponentially decreases with the increase in temperature and could be considered as

Learn More

PDF "Mix Design Properties and Moisture Sensitivity

direct addition to the mix. Warm asphalt mix foam: This is a component of soft binder and hard foamed binder, which are added at different time during mixing. WAM-Foam is product of Shell petroleum company Ltd., U.K. and Kolo-veidekke, Norway. Initially soft binder is added at a temperature about 100ºC-120ºC to coat the aggregate. Later hard binder foam is mixed with the aggregate. Revix

Learn More

Effect of Oxidative Aging on Dynamic Modulus of Hot-Mix

The dynamic modulus (| E * |) of asphalt mixtures is an important parameter in pavement design and analysis.Although the | E * | values of freshly prepared hot-mix asphalt (HMA) mixtures can be conveniently determined through laboratory tests, the | E * | values of field pavements continuously evolve as asphalt binder ages, and hence are difficult to determine.

Learn More

Practice for Superpave Warm Mix Asphalt (Wma) Mix Design

TP 79-12 Determining the Dynamic Modulus and Flow Number of Hot Mix Asphalt Using the Asphalt Mixture Performance Tester (AMPT) R 30-02 (2010) Mixture Conditioning of Hot Mix Asphalt (HMA) R 35-12 Superpave Volumetric Design for Hot Mix Asphalt (HMA) 2.3 ASTM Standards D6752-11 Standard Test Method for Bulk Specific Gravity and Density of Compacted Bituminous Mixtures Using Automatic Vacuum

Learn More

Effects of Ageing on Warm Mix Asphalts with High Rates of

claimed asphalt pavement and warm mix asphalt technologies. For this purpose the complex modulus and fatigue resistance of three different asphalt mixtures, in-cluding surfactant modified and foamed warm mix asphalts, combined with re-claimed asphalt pavement (RAP) has

Learn More

Research - Michigan Technological University

Mr. Siyu Chen (Ph.D. Student): Rubber-modified asphalt materials, Analysis of permeability and porosity of asphalt mixture, and discrete element method (DEM) Mr. Lingyun You (Ph.D. Student): Molecular dynamic (MD) simulation, Foamed asphalt mixes, Chip-seal application, Finite element analysis (FEA), and Pavement structure analysis ; Mr. Dongdong Ge (Ph.D. Student): Recycled asphalt pavements

Learn More

PDF Design and Evaluation of WMA - University of Idaho

Conventional Hot Mix 300ºF Foamed Asphalt Wax and Chemical Additives Every 10°degrees increase of temperature doubles exposure to asphalt fumes - BP 0 0.4 0.8 1.2 1.6 2 mg/cubic meter Total Organics Benzene Solubles Hot Mix Warm Mix. 52nd Idaho Asphalt Conference, 10/25/2012 9 Improvements in mix performance • Increase use of modified binders • Increase use of coarse mixes • Required

Learn More

Measuring Effects of Warm-Mix Additives: Use of Newly

An emphasis on environmental stewardship has prompted the use of warm-mix technologies aimed at allowing for production of conventional asphalt mixtures at reduced temperatures. Successful use of warm-mix asphalt (WMA) in field demonstrations has created a need for development of mix design procedures. A major impediment in development of these procedures is the evaluation of the effect of WMA

Learn More

Rutting Potential of Warm Mix Asphalt and Possible

The main objective of this study is to evaluate the rutting potential of warm mixesproduced with various warm mix additives (Evotherm, Sasobit, and foamed asphalt). To achievethis objective, an experimental matrix was developed to determine the mechanical properties ofwarm mixes and the control mix. Laboratory performance testing includes evaluation ofmodulus, strength, and rutting

Learn More

Meso-scale rheological characteristics of foamed bitumen

The increasing concerns to reduce the production of harmful emissions, decrease energy consumption and preserve the natural resources have motivated the asphalt industry to lower the production temperatures of asphalt mixtures and incorporate alternative materials. One approach is to use Foamed Bitumen Mixtures (FBM) in combination with Reclaimed Asphalt Pavement (RAP) material.

Learn More

New Admixture for Foamed Warm Mix Asphalt: A Comparative

Construction of flexible pavements with hot mix asphalt (HMA) consumes a huge amount of energy, which exhausts the resources and impacts the environment. Warm mix asphalt (WMA) has advantages over HMA in terms of mixing and compaction temperature reduction, which saves energy and money and reduces pollution. Foaming of asphalt using aspha-min is the most common manner to

Learn More

Advantages and limitations of using foamed bitumen | Acta

Foamed asphalt refers to a bituminous mixture of road-building aggregates and foamed bitumen, produced by a cold mix process. There are a lot of related issue that has not been sufficiently investigated so far. It is worthwhile to overview the main theoretical and practical results in the field in several countries including those of the authors of the paper.

Learn More

Rheological, physicochemical, and microstructural

Warm mix asphalt (WMA) is gaining increased attention in the asphalt paving industry as an eco-friendly and sustainable technology. WMA technologies are favorable in producing asphalt mixtures

Learn More

Impacts of water content on rheological properties and

It has been shown from existing studies that foamed Warm Mix Asphalt (WMA) can effectively improve the workability of asphalt mixtures at relatively low temperature. However, there is limited research into the influence of the amount of water used to foam WMA on the rheological properties and performance-related characteristics of the foamed

Learn More

PDF Warm Mix Asphalt "National Overview

NCHRP 9-53 "Asphalt Foaming Characteristics for Warm Mix Asphalt Applications" $700,000 23 National Research Initiatives . Proposed NCHRP project for 2013: •"Recycled Asphalt Shingles (RAS) and Recycled Asphalt Pavement (RAP) in HMA/WMA Mixtures" •Endorsement by: -AASHTO SOM TS2c Asphalt-Aggregate Mixtures -FHWA WMA Technical Working Group -FHWA RAP Expert Task Group

Learn More

CHARACTERIZATION OF AGING AND FOAMING PROPERTIES

implementation of warm mix asphalt (WMA) in the United States. While asphalt foaming has become the most popular method for producing WMA, concerns remain about the performance of foamed asphalt mixtures due to the use of water in the foaming process. Along with the advent of WMA, recent changes in asphalt mixture components

Learn More

National Center for Asphalt Technology

Flow Number Test and Assessment of AASHTO TP 79-13 Rutting Criteria-Comparison of Rutting Performance of Hot-Mix and Warm-Mix Asphalt Mixtures. Transportation Research Record: Journal of the Transportation Research Board, No. 2507 , Transportation Research Board of the National Academies, Washington, D.C., 2015, pp. 100-107.

Learn More

PDF] Asphalt Mix Characterization Using Dynamic Modulus

This final report summarizes two research efforts related to asphalt mix characterization: dynamic modulus and Asphalt Pavement Analyzer testing. One phase of the research consisted of a laboratory-based evaluation of dynamic modulus of Oregon dense-graded hot mix asphalt mixes. Gyratory compacted specimens were prepared using a single aggregate source and gradation and four binder

Learn More

Effects of the Water-Based Foaming Process on the Basic

opment of asphalt mixtures produced at temperatures of about 120-140 C. Traditional hot mixes are produced at about 170 C, depending on the type of bitumen used [13,14]. With the emergence of Warm Mix Asphalt (WMA) technologies [15-17], water-foamed bitumen was found to be applicable to mixtures used in pavement upper layers [18,19].

Learn More

PDF Alternate Methods for Evaluation of Moisture Sensitivity

and three hot mix asphalt (HMA) mixtures using the modified AASHTO T283 procedure that is currently used by NCDOT. The percentage of stripping determined from the colorimeter analysis of the fractured surfaces of the specimens was used as a reference test method to indicate the level of stripping in WMA and HMA mixes. 17. Key Words Asphalt Mixture, Moisture Sensitivity, TSR Test, Colorimeter

Learn More