Optimizing Asphalt Mixtures for Low-volume Roads (LVRs) in Minnesota

Optimizing Asphalt Mixtures for Low-volume Roads (LVRs) in Minnesota

Author: Manik Barman

Publisher:

Published: 2023

Total Pages: 0

ISBN-13:

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Minnesota has a large number of low-volume asphalt roads. These roads typically fail because of environmental factors, such as frigid temperatures, freeze-thaw cycles, and seasonal and daily temperature variations. The goal of this study was to suggest modifications to asphalt mixture designs currently used for low-volume roads in Minnesota to improve the resistance of the mixes against the environmentally driven distresses. The study was conducted by accomplishing multiple tasks, such as a literature review, online survey, fieldwork studying the cause of the asphalt pavement distresses, laboratory work comparing asphalt mixtures designed with Superpave-4, Superpave-5, and regressed air voids methods, and studying the field compaction of Superpave-5 mixes. The mechanical performance of the asphalt mixes was studied by conducting Disc-Shaped Compact Tension (DCT), Indirect Tensile Strength (ITS), and Dynamic Modulus (DM) tests. The study included both laboratory- and plant-produced mixes. The study found that asphalt layers for the low-volume roads did not get enough densification, which augments environmentally driven distresses, such as thermal cracks, and longitudinal joint cracks. The Superpave-5 method holds considerable promise for the design of asphalt mixtures for low-volume roads in Minnesota, which may likely increase the asphalt layer densification and mitigate some of the common distresses.


Investigation of Hot Mix Asphalt Mixtures at Mn/ROAD

Investigation of Hot Mix Asphalt Mixtures at Mn/ROAD

Author: Mary Stroup-Gardiner

Publisher:

Published: 1997

Total Pages: 260

ISBN-13:

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This report presents the material characterization for the Minnesota Road Research Project (Mn/ROAD) bituminous materials. This effort will provide the historical base line information on properties needed for the validation of future pavement evaluation and design models. The objectives of the work were to 1) Document construction of Mn/ROAD, 2) Establish a series of test methods for characterizing the materials and 3) Develop a data base of material properties to develop mechanistic pavement design procedures. Documentation on construction included mixture design, construction techniques and a summary of test results. The laboratory test methods represent a wide variety of tests developed by the Strategic Highway Research Program, the National Cooperative Highway Research Program and the Federal Highway Administration. The materials represent those tested during the mixture design, construction and post construction phases of Mn/ROAD.


Optimizing the Performance of Item 404-low Volume Traffic Mixes

Optimizing the Performance of Item 404-low Volume Traffic Mixes

Author: Ala R. Abbas

Publisher:

Published: 2023

Total Pages: 0

ISBN-13:

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Most local public agencies (LPAs) in Ohio follow the Ohio Department of Transportation (ODOT) specifications for designing asphalt mixtures placed on low-volume roads, with the majority of these agencies using Type 1 surface mixes prepared using PG 64-22 asphalt binders. As an alternative, some LPAs use a mix known as 404LVT, which is a fine-graded recipe mix that is rich in asphalt binder and can be placed at a thickness of 1 inch to correct minor surface distresses. The main goal of this study was to optimize the 2015 404LVT specifications developed by Flexible Pavements of Ohio (FPO) for use by LPAs in Ohio on low-volume local roads. To achieve this objective, information was collected about the current state-of-the-practice for using 404LVT mixes in Ohio. In addition, a laboratory testing plan was designed and executed using materials collected from different asphalt plants across Ohio. This research project also involved evaluating the field condition of pavement sections constructed using 404LVT mixes. Based on the outcome of the laboratory test plan and the pavement condition evaluations, several recommendations were made to improve the performance of 404LVT mixes. In addition, recommendations were made to modify the 404LVT specifications in order to make the mix more cost-effective without compromising its performance.


Design Procedure for Bituminous Stabilized Road Surfaces for Low Volume Roads

Design Procedure for Bituminous Stabilized Road Surfaces for Low Volume Roads

Author: W. James Wilde

Publisher:

Published: 2008

Total Pages: 62

ISBN-13:

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Many low-volume roadways in the county road system in the State of Minnesota consist of unpaved aggregate surfaces. It is the responsibility of the county engineer to make determinations regarding the design and maintenance of such roads and particularly for specific needs, such as weight restrictions. One method used by several counties in Minnesota is the construction of a bituminous-stabilized layer by adding several inches of new aggregate and stabilizing it with an engineered, water-based asphalt emulsion using mix-in-place methods. This report describes a design method providing highway engineers and their staffs with the technical backing needed for the designs selected. This report describes the design method for determining the required thickness of stabilized and unstabilized layers in this type of aggregate-surfaced road. This basic design method is based on the material properties and a correlation between layered-elastic analysis, dynamic cone penetrometer, and falling-weight deflectometer testing. The load rating analysis uses the Minnesota Department of Transportation methodology of estimating load rating on low-volume roads using falling weight deflectometer data. A software package is also presented which was developed as part of this project.


AASHTO Guide for Design of Pavement Structures, 1993

AASHTO Guide for Design of Pavement Structures, 1993

Author: American Association of State Highway and Transportation Officials

Publisher: AASHTO

Published: 1993

Total Pages: 622

ISBN-13: 1560510552

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Design related project level pavement management - Economic evaluation of alternative pavement design strategies - Reliability / - Pavement design procedures for new construction or reconstruction : Design requirements - Highway pavement structural design - Low-volume road design / - Pavement design procedures for rehabilitation of existing pavements : Rehabilitation concepts - Guides for field data collection - Rehabilitation methods other than overlay - Rehabilitation methods with overlays / - Mechanistic-empirical design procedures.


The Uninhabitable Earth

The Uninhabitable Earth

Author: David Wallace-Wells

Publisher: Tim Duggan Books

Published: 2019-02-19

Total Pages: 384

ISBN-13: 052557672X

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#1 NEW YORK TIMES BESTSELLER • “The Uninhabitable Earth hits you like a comet, with an overflow of insanely lyrical prose about our pending Armageddon.”—Andrew Solomon, author of The Noonday Demon NAMED ONE OF THE BEST BOOKS OF THE YEAR BY The New Yorker • The New York Times Book Review • Time • NPR • The Economist • The Paris Review • Toronto Star • GQ • The Times Literary Supplement • The New York Public Library • Kirkus Reviews It is worse, much worse, than you think. If your anxiety about global warming is dominated by fears of sea-level rise, you are barely scratching the surface of what terrors are possible—food shortages, refugee emergencies, climate wars and economic devastation. An “epoch-defining book” (The Guardian) and “this generation’s Silent Spring” (The Washington Post), The Uninhabitable Earth is both a travelogue of the near future and a meditation on how that future will look to those living through it—the ways that warming promises to transform global politics, the meaning of technology and nature in the modern world, the sustainability of capitalism and the trajectory of human progress. The Uninhabitable Earth is also an impassioned call to action. For just as the world was brought to the brink of catastrophe within the span of a lifetime, the responsibility to avoid it now belongs to a single generation—today’s. LONGLISTED FOR THE PEN/E.O. WILSON LITERARY SCIENCE WRITING AWARD “The Uninhabitable Earth is the most terrifying book I have ever read. Its subject is climate change, and its method is scientific, but its mode is Old Testament. The book is a meticulously documented, white-knuckled tour through the cascading catastrophes that will soon engulf our warming planet.”—Farhad Manjoo, The New York Times “Riveting. . . . Some readers will find Mr. Wallace-Wells’s outline of possible futures alarmist. He is indeed alarmed. You should be, too.”—The Economist “Potent and evocative. . . . Wallace-Wells has resolved to offer something other than the standard narrative of climate change. . . . He avoids the ‘eerily banal language of climatology’ in favor of lush, rolling prose.”—Jennifer Szalai, The New York Times “The book has potential to be this generation’s Silent Spring.”—The Washington Post “The Uninhabitable Earth, which has become a best seller, taps into the underlying emotion of the day: fear. . . . I encourage people to read this book.”—Alan Weisman, The New York Review of Books