Tar Concrete Pavement Construction and Performance

In 1969, a 6.6-mile section of relocated KY 15 in Perry and Knott Counties was paved utilizing coal-tar (RT-12) concrete base and surface. This project was authorized under the Appalachian Regional Development Act of 1965 and was designated as experimental as a means of implementing a section of the Act. Two nearby sections of KY 15, containing asphalt (PAC-5) concrete base and surface, were designated as control sections and used for comparison purposes. With the exception of the bituminous material, the experimental and control sections were purposefully made equal in all other respects. A design soil CBR of 9 was used throughout, and the EWL\u27s were estimated at 40-80 million. Total thickness for each section was 17.5 inches (11 inches DGA base and 6.5 inches bituminous concrete). The coal-tar binder was substituted for the asphalt cement on the basis of equal volume. A project map is shown in Figure 1

Ballast Size for Safe Working Conditions in Railroad Yards and Terminals in Kentucky

During the 1994 Regular Session of the House of Representatives of the General Assembly of the Commonwealth of Kentucky, House Resolution No. 58 was introduced by Representative J. Dorsey Ridley on Monday, February 28. It basically directed the Transportation Cabinet to identify the more appropriate grade of rock used as surface material in railroad beds and walkways and that any remedy proposed... be reported to the Legislative Research Commission no later than August 1, 1995. A copy of the Resolution is contained in Appendix A. The issue was forwarded to the Transportation Cabinet and subsequently to the Kentucky Transportation Center at the University of Kentucky. Quick Response Study KYP 95-108, Subtask 26 was initiated. A copy of the Proposal is contained in Appendix B. The initial activity was to identify the basic railroad network in Kentucky and select the major rail classification yards and terminals for study

Railway/Highway At-Grade Crossing Surface Management

This multi-modal transportation activity involves selecting the most cost-effective rehabilitation technique that will provide safe, smooth, high-performance, long-life, serviceable crossings for the motoring public. This presentation will offer step-by-step guidance for a project from its planning stages through implementation and post-construction management. Further, it will instruct users on executing the three main project phases: (1) pre-project planning, (2) selecting appropriate rehabilitation techniques based on the pre-project studies and guidance, and (3) post-project administratio

Summary of Pavement Surface Texture Measurement Methods

This tabular summary represents an expanded version of a draft prepared under the direction of Prof. Bob M. Gallaway of Texas A & M University. The table was compiled from a literature survey conducted during spring 1970. A survey of all states and agencies engaged in quantitative measurements of surface texture would be helpful for updating and finalizing the table. In the meantime, any comments or suggestions concerning any of the tabular entries or other methods of surface texture measurement should be addressed to Dr. J. G. Rose, Research Engineer, Division of Research, Kentucky Department of Highways, 533 South Limestone, Lexington, Kentucky 40508

Aggregate Shape and Skid Resistance

This report concerns further efforts toward the measurement and analysis of the relative influence of aggregate shape on pavement skid resistance. A simple test method for determining aggregate shape in a meaningful way with respect to skid resistance is included. Proposed specifications for skid-resistant, sand-asphalt surface and skid-resistant, Class I, Type A, Modified, bituminous concrete surface containing lightweight aggregate are introduced

Kentucky Rock Asphalt (Kyrock) Road Surfacing Material: Preliminary Investigation

This report documents a preliminary investigation of Kentucky Rock Asphalt (Kyrock) - as a road surfacing material. The indigenous bituminous impregnated sandstone was widely used as a premium quality skid resistant surfacing material during the first half of this century. Redevelopment efforts gained momentum during the 1960\u27s, but for the last twenty years interest has waned. Laboratory tests were conducted on the Kyrock to determine its applicability in bituminous surface mixes by blending Kyrock with virgin materials in a similar manner as adding recycled asphalt pavement. The findings indicated it was feasible to blend Kyrock and a continuation proposal was presented

Effect of Enhanced Trackbed Support on Railway/Highway At-Grade Crossing Performance

This report documents the long-term performance of 89 railway/highway at-grade crossings in Kentucky and adjacent states that contain asphalt underlayment underneath the ballast. Asphalt underlayment increases load carrying capacity for trains and highway vehicles while enhancing the support structure’s waterproofing and confinement. The asphalt underlayment crossings studied were installed at sites that had historically exhibited poor performance and short service lives. Most of the crossing sites evaluated were 10-15 years old; however, their ages ranged up to 30 years. All of the crossings investigated have shown excellent performance since the installation of asphalt underlayments. No crossing failures, such as excessive settlement or mud pumping, have been noted, and the service lives of the crossing surfaces have been significantly improved. Detailed results from periodic inspections are included. A literature survey focuses on eleven public agencies and railroad companies that implement asphalt underlayments. Most of these entities install asphalt underlayments at heavy traffic/tonnage crossings that have routinely shown evidence of weak support leading to inferior performance. This survey, along with the empirical results of this study, indicates that asphalt underlayment, irrespective of material used on crossing surfaces, extends the service life of crossings and improves their performance

Railway/Highway At-Grade Crossing Surface Management: An Overview

This report draws on data from around the United States to describe the features of a successful railway/highway at-grade crossing management program; it emphasizes the highway/trackbed structures and crossing surfaces. Developing a structurally adequate crossing system is imperative, as this will produce a smooth surface and a stable highway/trackbed that prolongs crossings’ lifespans while keeping maintenance costs low and minimizing the number of disruptions encountered by highway and railway traffic. An overview of the guidance issued by several transportation agencies and organizations to facilitate the design and construction of railway/highway at-grade crossings is included here. Equally important to developing a robust network of crossings is defining a clear division of labor between federal, state, and local transportation agencies and railroad companies. As such, this report discusses administrative procedures and state-level regulations that influence railway/highway at-grade crossing practices. This information is presented for AASHTO, AREMA, FRA, FHWA, MUTCD, as well as several states, including Illinois, Indiana, Iowa, Georgia, Michigan, and West Virginia