01473668

Component

https://doi.org/10.3141/2371-13

http://scholar.google.com...aker&publication_year=2013

The availability of mineral aggregates for pavement construction is continuously depleting. The aggregate manufacturing process requires significant amounts of energy, which ranges from 10 to 30 MJ/ton. The process also produces 5 kg/ton of carbon dioxide (CO2), which causes significant amounts of greenhouse gas emissions. With the annual consumption of approximately 1.2 billion tons of aggregates in the United States, the environmental impact is significant. More than 125 million tons of fine-grained, crushed siliceous material is generated annually through iron ore mining in northern Minnesota. Typically, this material is referred to as "taconite tailings" and usually ends up as landfill near mining operations. This paper describes a moisture damage evaluation of asphalt mixes that contained significant fractions of aggregate as taconite tailings. The evaluation was conducted with the use of the conventional AASHTO T 283 test procedure as well as an approach with a fracture energy basis. The paper presents comparative results for two mixes: one made with taconite tailings and the other with conventional granite aggregates. The results indicated that a mix that contained taconite had acceptable moisture-damage resistance. The results also pointed out the limitations of the AASHTO T 283 procedure, especially the process of moisture conditioning. The fracture energy results indicated that, although mixes underwent reduced tensile strength, the overall capability of mix to strain without cracking significantly increased after the AASHTO-recommended moisture conditioning process. The study also included a set of samples that were field-conditioned over the winter and spring months. The mechanical behavior of field-conditioned samples was quite different from the behavior of samples conditioned in the laboratory with the AASHTO procedure.

01500961

13-4613

English

pp 113–120

2013

Transportation Research Record: Journal of the Transportation Research Board

9780309286947

Print

Figures (5) ; Photos; References (30) ; Tables (2)

Asphalt mixtures; Asphalt pavements; Cracking of asphalt concrete pavements; Environmental impacts; Greenhouse gases; Mineral aggregates; Moisture damage; Paving; Tensile strength; Waste products (Materials)

Taconite

Minnesota

Highways; Materials; Pavements; I22: Design of Pavements, Railways and Guideways; I31: Bituminous Binders and Materials

PRP, TRIS, TRB, ATRI

Feb 5 2013 12:53PM

• Asphalt Binder Contribution to Mixture Workability and Application of Asphalt Lubricity Test to Estimate Compactability Temperatures for Warm-Mix Asphalt
• Assessment of Warm-Mix Asphalt for Heavy Traffic Airfields
• Effects of Changing Virgin Binder Grade and Content on High Reclaimed Asphalt Pavement Mixture Properties
• Evaluation of Environmental Susceptibility of Bituminous Mastic Viscosity as a Function of Mineral and Biomass Fillers
• Forensic Study on the Cracking of New Jersey’s Long-Term Pavement Performance Specific Pavement Study Sections
• Influence of Hydrogreen Bioasphalt on Viscoelastic Properties of Reclaimed Asphalt Mixtures
• Laboratory Evaluation of Asphalt Mixtures That Contain Biobinder Technologies
• Long-Term Performance of Pavement with High Recycled Asphalt Content: Case Studies
• Low-Temperature Performance Characterization of Biomodified Asphalt Mixtures That Contain Reclaimed Asphalt Pavement
• Modeling of the Resilient Modulus for Recycled Asphalt Pavement Applications in Base Course Layers
• Performance Characterization of Asphalt Mixtures at High Asphalt Binder Replacement with Recycled Asphalt Shingles
• Performance Enhancement of Crumb Rubber–Modified Asphalts Through Control of the Developed Internal Network Structure
• Reacted and Activated Rubber: Elastomeric Asphalt Extender