Pavement recycling is a necessity due to the diminishing supply of available construction materials and increasing regulations concerning the disposal of removed concrete and asphalt pavements. Since the 1950's and 60's recycling has grown to include hot and cold mix asphalt recycling, the use of crushed asphalt pavement as an aggregate base, and the use of Portland Cement concrete as an aggregate base, concrete
aggregate, and bituminous aggregate. Crack and seating and rubblizing of concrete pavement are also common forms of recycling in Minnesota.
The Minnesota Local Road Research Board (LRRB) requested that a report be written to provide information regarding the common methods of recycling, and to determine the status of recycling in Minnesota. This report outlines the recycling methods listed above, and gives specifications and mix designs for their use in Minnesota.
This report summarizes dust control procedures on unpaved roads used by various states and local agencies. The research results related to dust control are also outlined. The report starts with a brief introduction on dust problems associated with unpaved roads and three main dust control methods: chemical, mechanical, and administrative. Preliminary concepts and background of a temporary surface treatment for dust control are presented. The relative effectiveness of a dust control program is estimated based on traffic levels, road conditions and the climate. The report discusses various materials used in dust control, selection of a proper dust palliative, dust control procedures, and evaluation of a dust control program. Results from a survey sent to Minnesota city and county agencies are presented summarizing current dust control practices used on unpaved roads. The report concludes with evaluation and recommendations based on the survey results and as extensive literature review.
This document discusses photovoltaic products which make use of solar energy to power highway signs and signal lights in remote areas. Included are the location of some of these products, their effectiveness, costs associated with their use, transportability, and appropriate uses. Also included is a review of the experiences Hennepin County has had with solar energy.
This report presents waste materials and products for highway construction. The general legislation, local liability, and research projects relating to waste materials are outlined. The waste materials and products presented include waste paving materials, industrial ash materials, taconite tailing materials, waste tire rubber materials and products, building rubble materials, incinerator ash products and materials, waste glass materials, waste shingle materials and products, waste plastics products and slag materials. For each waste category, the legislation and restrictions, material properties, construction and application, field performance, and recycling at the end of service life if available are discussed. In addition, procedures for evaluation of and selection from waste alternatives are presented. Results from a survey sent to Minnesota city and county agencies are presented summarizing current practices in waste reuse for highway construction.
This report documents the current practices of Minnesota in rehabilitating Hot Mix Asphalt pavement with thin and ultra-thin Portland cement concrete overlays, i.e. thin and ultra-thin whitetopping. The current practices of thin whitetopping (TWT) in Minnesota and its adjacent states have shown that TWT has been used successfully and is an important alternative for rehabilitating HMA pavements of medium-volume roads. If designed and constructed properly, TWT is also an important alternative for rehabilitating HMA pavements of highway volume roads with more requirements in HMA quality, bonding and fiber reinforcement. The performance of ultra-thin whitetopping (UTW) projects in Minnesota ranges from very good to failing. The sections that perform poorly are short sections under stopping trucks or buses and over thin or poor condition HMA pavement. UTW has been used successfully in Minnesota when inlaid into thick and sound HMA pavements even in high-volume traffic. The quality of the HMA substrate, bonding, fiber reinforcement, and joint spacing all significantly affect the success of UTW. Great caution should be used when rehabilitating HMA pavements at bus stops, weigh stations, and intersections. The Minnesota Department of Transportation (Mn/DOT) does not recommend UTW for major highways and heavy traffic areas.
The Minnesota Department of Transportation has collected pavement distress and ride data from the pavements in their system since 1967. In 1986, the data was analyzed to develop pavement performance prediction models that were based on the growth of pavement distresses such as cracking, rutting, and roughness. The analysis at that time was limited by the amount of data available and was considered to be an interim study. The amount an quality of data presently available has improved from that available in 1986 and new or improved models could be developed. The work involved the analysis of all of the pavement condition data collected since 1983 when improved collection procedures were implemented. A literature search was also conducted. The results of the study was the evaluation of pavement life and the development of mathematical models that describe the growth of the distresses rated and the change in roughness over time. Over 100 pavement groupings were evaluated. The groupings were selected on the bases of a variety of pavement attributes including surface type, functional class, and region (construction district). The life of the pavements were evaluated based on the number of years they remained in service and on the basis of performance indices. It was found that the number of years a pavement remains in service can not be used to infer performance potential since a number of pavements were rehabilitated for reasons other than condition; the predicted pavement condition provides a better indication of the performance life of a pavement. The prediction of
future pavement performance is accomplished by using the distress growth models to predict the growth of the distresses; the future condition indices are than calculated from the predicted distress amounts.
The high cost of processing wastes for reuse, and the uncertainty of their performance and durability require that a better justification of their use be provided. This report establishes a waste source inventory with the technical definitions and sources of waste products. Waste materials are evaluated, along with field performance of roads built with them. This report also summarizes survey results regarding the use of waste
materials in Minnesota highway construction, based on responses from city and county engineers.
A full report on Waste Materials in Highway Construction, giving complete descriptions and properties of waste materials is available from the Local Road Research Board. This Executive Summary is to serve as an overview of practices and materials available in Minnesota.
This Research Implementation Series (RIS) has been developed in conjunction with RIS Number 18 entitled Use of Herbicides. This two part series is intended to provide an updated summary regarding the regulation and application of herbicides. This information will serve as integrated education/training modules for local governmental agencies. In this document, herbicides are discussed with respect to the current EPA and other governmental regulations and restrictions, applicator safety, and program planning and management.
This document was developed in conjunction with Research Implementation Series (RIS) 17, entitled Herbicides for Roadside Vegetation Management, which describes the process and components of establishing a management plan for controlling roadside vegetation. These two documents will serve as integrated education/training modules for local governmental agencies.
This document discusses the uses of herbicides with respect to weed biology, soil science, chemical characteristics of herbicides and growth regulators, application and usage. A user guide/table for the recommended use of various herbicides and growth regulators for specific situations is provided. Before using any of the herbicide products, the user should read and follow the information on the product label, which is the best source of information.
The Mn/DOT Standard Specification for aggregates contains several different classes of surfacing and base course aggregates. To effectively use and specify these aggregates, it is important that their performance be characterized, and guidelines for their use be established. This report will outline the properties of each aggregate class and detail the effect that the specifications have on the performance, stability, durability, and weathering of an aggregate surface course, base, and shoulder material.
