Construction Aggregate Potential of Minnesota Taconite Industry Byproducts

Zanko, Lawrence M; Fosnacht, Donald R; Hopstock, David M.

doi:10.1061/41072(359)27

Cited by 14 publications

(15 citation statements)

References 1 publication

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“…A study in Minnesota ( 8 , 9 ) used magnetite powder obtained from taconite ore in pavement patching materials. A 50 kW truck-mounted generator produced microwaves that were transmitted to a stainless steel shroud placed over a pothole.…”

Section: Literature Reviewmentioning

confidence: 99%

Rapid Inductive Heating of Asphalt Concrete to Hot Mix Temperatures for All-Season Pothole Patching: Feasibility Study

Cox

Floyd

Rushing

et al. 2019

Transportation Research Record: Journal of the Transportation R

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Potholes are a common pavement distress, a nuisance to roadway users, and a maintenance problem for state and local agencies. Patching materials are typically cold mix asphalt (CMA), generic or proprietary, in winter seasons and, ideally, hot mix asphalt (HMA) in warm seasons. Although proprietary CMAs generally perform better than generic CMAs, winter repairs with any CMA are usually considered temporary until semi-permanent repairs can be made. However, re-repairing is cost-ineffective to the point the mantra “do it right the first time” has been adopted by some states and researchers. Induction heating has the potential to rapidly heat standard-size containers (e.g., 19 L) of inductive asphalt mixtures to hot mix temperatures (e.g., 150°C) in a matter of minutes (e.g., 5 min), which would allow patching to be conducted with high-quality materials even in winter when conventional HMA is unavailable. The objective of this paper is to investigate the feasibility of this concept. A laboratory investigation evaluated multiple steel aggregates for inclusion in the inductive HMA (iHMA) and designed an iHMA mix that was field-validated by patching simulated potholes. Containers of iHMA were successfully heated in cold weather (–11 to 0°C) to 160°C in 5 min with 15% steel aggregate by volume. During full-scale trafficking tests, iHMA patches exhibited comparable rutting characteristics to control HMA patches.

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Section: Literature Reviewmentioning

confidence: 99%

Rapid Inductive Heating of Asphalt Concrete to Hot Mix Temperatures for All-Season Pothole Patching: Feasibility Study

Cox

Floyd

Rushing

et al. 2019

Transportation Research Record: Journal of the Transportation R

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“…In pavement engineering, considerable studies have been carried out on deicing technology in terms of microwave-absorbing materials, construction process, and pavement structure. Hopstock et al [ 14 , 15 ] first blended taconite material into an asphalt mixture to increase the electromagnetic properties of the mixture and successfully applied it to a demonstration project. Some researchers used waste materials to increase the performance of asphalt concrete.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Heating and Deicing Performance of Microwave-Absorbing Asphalt Mixtures

et al. 2023

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Road icing in winter brings challenges to traffic safety, and microwave heating and deicing technology is an effective method with the advantages of high efficiency and environmental protection. Magnetite has been widely used as a microwave-absorbing material in pavement. In this paper, magnetite powder formed by crushing natural magnetite and high-purity Fe3O4 powder after purification were mixed to replace mineral powder, and the magnetite aggregate was used to replace the limestone aggregate with the same particle size to enhance the asphalt mixtures’ microwave absorption capacity. The effect of microwave heating time and microwave power on the heating of the asphalt mixtures was studied, and the heating performance of different thicknesses of the asphalt mixtures under microwave radiation was evaluated. The heating performance of the mixtures under different initial temperatures and ice layer thicknesses was also assessed. The results showed that the addition of the magnetite powder–Fe3O4 powder and the magnetite aggregate significantly enhanced the heating performance of the asphalt mixtures by microwave heating. The replacement of the magnetite powder–Fe3O4 powder, the microwave heating time, and the microwave power had positive effects on the heating efficiency of the asphalt mixtures. Moreover, the thinner asphalt mixtures had a better heating performance. The heating and deicing performance of the mixtures decreased with a decline in initial temperature. As the ice thickness increased, the deicing time of the specimen surface to reach 0 °C also increased.

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“…Siderite (FeCO 3 ) is commonly observed in the rock wastes of iron mining in Minnesota, , and it is a useful source of iron for sulfide immobilization due to the +2 oxidation state of iron. Additionally, the process of mineral dissolution releases carbonate ions, which have acid buffering capacity.…”

Section: Introductionmentioning

confidence: 99%

Sulfide Immobilization: Investigating the Impact of a Protective Sulfide-Bearing Layer Formed by Siderite (FeCO₃)

Bingham

McCormick

Penn

2023

ACS Earth Space Chem.

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Sulfate-rich wastewater poses ecological hazards to freshwater ecosystems, and sulfate is highly regulated in many Minnesota lakes. Biological sulfate reduction results in the reduction of sulfate to sulfide, and this process is used to remediate acid mine drainage. Theoretically, the aqueous sulfide can be immobilized into a solid-phase material and removed from the aqueous system. This study focuses on sulfide immobilization using iron-bearing waste minerals. Specifically, the extent of reaction of siderite (FeCO 3 ), an abundant ferrous mineral in some mining wastes, with sulfide was studied. Mildly acidic batch reactors containing powdered siderite were consecutively injected with a sodium sulfide solution. Solid reaction products were identified and characterized using powder X-ray diffraction, scanning and transmission electron microscopy, and energy-dispersive Xray spectroscopy. Mackinawite (FeS) appeared to be the most abundant product, with greigite (Fe 3 S 4 ) also detected. Results reveal that the immobilization capacity of sulfide by siderite is limited by the concentration of the Fe 2+ (aq) presented in the system immediately before the initial sulfide exposure as the Fe 2+ (aq) levels are not replenished after sulfidation. These results improve our understanding of the sulfidation of siderite and provide insight to improve the viability of using siderite-containing mining waste rock in a sulfate remediation technology.

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Construction Aggregate Potential of Minnesota Taconite Industry Byproducts

Cited by 14 publications

References 1 publication

Rapid Inductive Heating of Asphalt Concrete to Hot Mix Temperatures for All-Season Pothole Patching: Feasibility Study

Rapid Inductive Heating of Asphalt Concrete to Hot Mix Temperatures for All-Season Pothole Patching: Feasibility Study

A Study on the Heating and Deicing Performance of Microwave-Absorbing Asphalt Mixtures

Sulfide Immobilization: Investigating the Impact of a Protective Sulfide-Bearing Layer Formed by Siderite (FeCO₃)

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Construction Aggregate Potential of Minnesota Taconite Industry Byproducts

Cited by 14 publications

References 1 publication

Rapid Inductive Heating of Asphalt Concrete to Hot Mix Temperatures for All-Season Pothole Patching: Feasibility Study

Rapid Inductive Heating of Asphalt Concrete to Hot Mix Temperatures for All-Season Pothole Patching: Feasibility Study

A Study on the Heating and Deicing Performance of Microwave-Absorbing Asphalt Mixtures

Sulfide Immobilization: Investigating the Impact of a Protective Sulfide-Bearing Layer Formed by Siderite (FeCO3)

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Sulfide Immobilization: Investigating the Impact of a Protective Sulfide-Bearing Layer Formed by Siderite (FeCO₃)