Engineering Commons^™

Traffic Speed Report No. 110 : Interim Report, Richard Philip Guenthner, George K. Stafford

JTRP Technical Reports

No abstract provided.

Ole Miss Engineer 1978

Ole Miss Engineer

No abstract provided.

Deck-Reinforced Slab Systems, Max L. Porter, C. E. Ekberg Jr.

CCFSS Library (1939 - present)

No abstract provided.

Acoustic Emission Monitoring Of Weldments, Theodore Hopwood Ii, James H. Havens

Kentucky Transportation Center Research Report

Weld tests were performed on low-carbon and high-strength, low-alloy steel weldments. The weldments were monitored with an acoustic emission detector during both the 'in-process' and the 'in-cooling' phases of the welding operation. Artificial defects were induced in several of the welds to promote cracking. Some high-strength weldments were designed to produce welds subject to high restraint.

Nondestructive and destructive evaluation of the completed weldments revealed that high acoustic emission activity 'in-cooling' could be correlated with embedded defects and cold-cracking. Copious emission activity was also detected from unflawed weldments. Acoustic emissions were detected in high-strength steel weldments for periods up to …

Low-Void Concrete Mixtures, Assaf S. Rahal, James H. Havens

Kentucky Transportation Center Research Report

The purpose of this study was to modify concrete mix-design formulas to supplant all water over and above that needed for hydration with a non-evaporable liquid material and(or) a super-water-reducer or plasticizer -- thus producing a low-void concrete. A water-cement ratio of 0.244 - 0.30 was presumed minimal for hydration of the cement. Several polymeric materials, asphalts, oils, and superplasticizers were used. Success was achieved with two latexes, one epoxy, and several superplasticizers. The use of these materials in concrete resulted in improved strength, reduction of air voids and permeability, and enhancement of resistance to corrosive chloride salts.

University Programs In Air Pollution Control: Review And Outlook, August T. Rossano, Harold M. Cota

Civil and Environmental Engineering

From the inception of the National Air Pollution Control program, the U. S. Congress has been mindful of the need and importance of adequate manpower. The challenging technical problems which lie ahead in enforcement, monitoring, testing and research can be effectively dealt with only by individuals with specialized knowledge, skills and experience. In this paper the authors look at undergraduate and graduate training that is being carried out, employment opportunities and the way these may change in the future. A recently completed survey of college level air pollution training in the United States and Canada is included in the report.

Priority Programming For Highway Reconstruction, Charles V. Zegeer, Rolands L. Rizenbergs

Kentucky Transportation Center Research Report

An adequacy-rating procedure was developed for use in priority programming for highway reconstruction. The procedure makes use of 15 roadway and traffic elements to rate highway sections in urban and rural areas based on 100 points. Condition elements (35 points) include a subjective rating of highway foundation, pavement surface, drainage, and maintenance economy. Safety elements (35 points) are stopping sight distance, highway alignment, skid resistance, accident experience, and traffic control devices. Service elements (30 points) include shoulder width, passing opportunity, rideability, surface width, volume/capacity ratio, and average speed.

Some of the advantages of the new procedure include computerized analysis of …

Seatbelt Usage In Kentucky [Nov. 1978], Kenneth R. Agent, Michael Barclay, Robert C. Deen

Kentucky Transportation Center Research Report

In this report, the effectiveness and usage of seatbelts in Kentucky and factors affecting usage are examined and identified. Data were obtained from three sources: field observations, accident reports, and a questionnaire.

Kentucky drivers and passengers were found to have lower seatbelt usage rates (slightly under 10 percent) than drivers and passengers in other states. The accident data showed that the chances of being killed or severely injured is greatly reduced by wearing a seatbelt. Seatbelts reduced the chance of being killed by a factor of six and the chance of being severely injured by a factor of two. Several …

Design System For Asphaltic Concrete Overlays, Herbert F. Southgate, Gary W. Sharpe, Robert C. Deen

Kentucky Transportation Center Research Report

A method of designing asphaltic concrete overlays has been developed from (1) Kentucky's theoretical design curves, (2) an estimate of future traffic and the associated fatigue (five procedures are presented according to types of information available), (3) strength of subgrade on subject project (laboratory CBR tests or results of dynamic in-place tests such as the Road Rater), and (4) present condition of the existing pavement (from dynamic in-place tests, roughness measurements, or present serviceability index). Deterioration has been expressed as reduced or effective thicknesses of new-quality materials producing the same measured dynamic deflections. The total thickness required for the future …

Analysis Of Weekday, Weekend, And Holiday Accident Frequencies, Jerry G. Pigman, Rolands L. Rizenbergs, Donald R. Herd

Kentucky Transportation Center Research Report

On rural roads, the largest number of accidents have occurred on Saturdays, Fridays, and Sundays, respectively. Tuesdays generally had the lowest number of accidents. The highest accident rates for two-lane roads were on Sundays and Saturdays, and the rates for expressways (interstates and toll roads) were the highest on Sundays. Accident rates on weekends were substantially higher than on weekdays. Rates of fatal and all accidents were lower during holiday periods than during weekends not involving holidays. Holiday periods had fewer accidents per day than weekends but had more accidents per day than weekdays. Traffic during holidays, however, was significantly …

Statewide Survey Of Skid Resistances Of Pavements [Nov. 1978], Rolands L. Rizenbergs, James L. Burchett

Kentucky Transportation Center Research Report

In 1969, a research-type, skid-test trailer was acquired, U.S. routes were surveyed in 1970 and 1971, and the interstate and toll-road systems were surveyed in 1971. The data were used for research purposes and have been reported. The interstate and toll-road systems were surveyed again for research purposes in 1974. Since October 1974, surveys have been performed under highway safety project grants (interaccounted to 108, subsection OSKID). Primary and principal secondary roads, involving 4,613 miles (7,427 km), were surveyed in 1975. A second skid tester, a survey-type, was acquired in April 1976; and survey-testing of major, rural collector roads continued …

Pavement Evaluation Using Dynamic Deflections, Gary W. Sharpe, Herbert F. Southgate, Robert C. Deen

Kentucky Transportation Center Research Report

Dynamic test deflections have been duplicated by elastic theory using the Chevron N-layered computer program. Dynamic surface deflections obtained using the Road Rater have been used in conjunction with elastic theory to analyze pavement behavior. A procedure has been developed to use field measured Road Rater deflections to estimate the elastic moduli of the foundation material and to determine the equivalent thicknesses of new material which approximate the behavior of the structure. The estimated moduli and (or) equivalent thicknesses may be used as inputs to design overlay thicknesses. An analysis of the deflections of the first three sensors of the …

Ambient Air Quality As Related To Energy Conversion Facilities, Economic Activity And Population, Walter P. Page

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

The paper examines the relationships between ambient air quality and energy conversion facilities, economic activity and population. Additional results are presented from investigation of the relationship between ambient air quality and total emissions from four source categories.

Some Problems With Economic Models Involving Air Pollution, John Hoag, J. David Reed

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

In this paper we consider how economic models have interfaced with environmental problems in three areas: optimal air quality standards, pollution control policy and growth with pollution. The focus is on what has been done and what should be done.

Stabilization Of Uranium Mill Trailings, N. H. Tibbs, D L. Rath, E. E. Otto, L. F. Alsup

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

Large volumes of uranium mill tailings are being generated, requiring comprehensive long-term management programs to reduce health and environmental risks. Management programs are available which provide adequate secure long-term storage, but research on innovative concepts is necessary to develop improved, more efficient methods.

Energy Is Not Just Flipping The Switch Any More, Alfred L. Ransome

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

The energy industry -- or basically the mining industry -- is becoming more complex and costly. It is imperative that the facts pertaining to the mineral industry be disseminated to the layman; the best method in the long term is by way of science and economics in the schools -- kindergarten through high school. The Mineral Information Committee of the Colorado Section of the SME-AIME in cooperation with the Metro State College, Denver is embarking on such a program, and the newly developed magazine, "RESOURCES", is the vehicle for spreading the message through the classroom.

Carrying Water To Newcastle, Lloyd Lore Wartes

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

Western coals, now being shipped by unit trains to eastern and southern markets, contain from 13% to 32% moisture. Drying of these coals at the mine would reduce the cost of coal to the utilities from 10% to 16% IF the railroads do not materially increase rates on higher BTU coal.

The spontaneous combustion of dry coal can be inhibited, and the savings per unit train should range from $1,375,000 to $4,129,000 per year according to the various minimum tonnage rates. The shipment of dried coal will reduce the tonnages being shipped by 15%, or increase the railroad carrying capacity …

Oil Shale Energy And The Environment, Stephen Utter

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

Shale oil can be produced from oil shale by true In situ, modified in situ, and surface retorting methods. Both modified in situ and surface methods require mining of the oil shale. The environmental Implications of an oil shale mining industry are reviewed and the impacts upon land use, air and water quality, and ecological systems discussed. The Bureau's mining environmental research program is described and the results to date summarized.

The Impact Of Public Transportation Policy To Affect Energy Conservation (A Case Study), Ali A. Selim, John T. Kretzer, Braja M. Das

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

In order that public transportation policies relating to energy conservation might be identified, correlated, and assessed, a mail survey of local, regional, state, and federal appointed and elected officials was made. This survey also included contacting members of the regional business community. Although the responses received did not constitute the complete survey mailing, they did provide insight to the individual policymaker's perception of what public policy is now in effect and how it was enacted, particularly those pertinent to energy conservation in the transportation sector.

Effective Use Of Bottom Ash As A Geotechnical Material, Braja M. Das, Ali A. Selim, Tom W. Pfeifle

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

Some geotechnical properties of bottom ash produced from the burning of North Dakota lignite in a power plant are presented. These properties include grain size distribution, maximum and minimum void ratios, maximum dry density of compaction and optimum moisture content from standard Proctor tests, angle of friction, one-dimensional compressibility, and coefficient of permeability. The geotechnical properties of this bottom ash, as determined from laboratory tests, appear to be comparable to those generally obtained from poorly graded sands and indicate that bottom ash can be used for such works as backfill of retaining structures, construction of highway embankments, and fill material …

Energy Aspects Of Rural School Bus Transportation, Kirk R. Hastain, Frank A. Gerig

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

In an effort to determine the effect of rural school bus transportation on energy consumption, a study was made of a rural school district in Central Missouri. The school district's bus system was studied, records of fuel and maintenance costs were analyzed, and discussion held with supervisor and bus drivers. An effort was made to recommend ways by which energy could be conserved, without jeopardizing the welfare of the students.

Multimodal Analysis Of The Western Coal Transportation System, Kenneth Ebeling, Kam Li

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

Points raised in the coal slurry pipeline issue imply a need for an analysis of the multimodal alternatives within the context of the existing western transportation system. In reporting the initial results of the first study of its kind, this paper includes a brief description of the data base and computer routines used to construct a base case and ideal case senerios of the western coal transportation issues.

Transporting Coal In Containers Through Pipeline -- A Feasibility Study, Henry Liu

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

A preliminary assessment of the feasibility of transporting coal in containers suspended in water moving through pipes - the concept of hydraulic capsule (container) pipelining (HCP) - is presented. The assessment includes technical (engineering), environmental, social and economic considerations. A tentative conclusion reached is that HCP transportation of coal is technically feasible (although it needs further research and development works), socially and environmentally beneficial, and economically justifiable in a number of situations.

Ole Miss Engineer 1978

Ole Miss Engineer

No abstract provided.

Irish H & V News

Building Services Engineering

No abstract provided.

Warrants For Left-Turn Signal Phasing, Kenneth R. Agent, Robert C. Deen

Kentucky Transportation Center Research Report

Warrants for the installation of left-turn phasing were developed. A review of literature was conducted along with a survey of the policies of other states. Field data of delays and conflicts were taken before and after installation of exclusive left-turn signalization. Left-turn delay studies were conducted at intersections with varying volume conditions. Analysis of the effect on accidents of adding a left-turn phase was made. The relationship between left-turn accidents and conflicts was investigated. Other types of analyses concerning gap acceptance, capacity, and benefit-cost ratios were also performed.

It was found that exclusive left-turn phasing significantly reduced left-turn accidents and …

A Rational Thickness Design System For Asphaltic Concrete Overlays, Herbert F. Southgate, Gary W. Sharpe, Robert C. Deen

Kentucky Transportation Center Research Report

A method of designing asphaltic concrete overlays has been developed making use of (1) Kentucky's proposed design curves, (2) an estimate of future traffic and the associated fatigue (five procedures are presented according to types of information available), (3) strength of subgrade on subject project (laboratory CBR tests or results of dynamic in-place tests such as the Road Rater), and (4) present condition of the existing pavement (from dynamic in-place tests, roughness measurements, or present serviceability index). Deterioration was expressed as reduced thicknesses of new-quality materials producing the same measured dynamic deflections. The total thickness for the predicted traffic minus …

Simulation Of Travel Patterns For Small Urban Areas, Jerry G. Pigman, Robert C. Deen

Kentucky Transportation Center Research Report

The objective of this study was to develop models which would simulate internal-external trips and external-external (through) trips. Regression analysis and cross-classification of data were tested in an attempt to predict the number of internal-external trips and the percentage of through trips. Regression analysis was used in the development of a through-trip distribution model. Grouping data for analysis created some problems; however, trial-and-error evaluation enabled selection of variables which produced reasonable results. Variables found to be most significant in the development of internal-external models were population and employment. For through-trip models, variables used were population, functional classification, AADT at the …

Green-Extension Systems At High-Speed Intersections [Sept. 1978], Charles V. Zegeer, Robert C. Deen

Kentucky Transportation Center Research Report

The purpose of this study was to determine the effectiveness of green-extension systems (GES) for reducing the dilemma-zone problem associated with the amber phase of traffic signals at high-speed intersections. Reactions of 2,100 drivers were noted during the amber phase at nine intersections, and the dilemma-zone distances with respect to the stop bar were determined.

Before-and-after studies made at three green-extension sites showed a 54-percent reduction in total accidents and a 75-percent reduction in rear-end accidents after GES installation. Accident severity was unaffected.

Conflict, volume, delay, and speed data were taken before and after GES installation at two sites. A …

Evaluation Of Paint Stripe Beads, Jerry G. Pigman, Kenneth R. Agent

Kentucky Transportation Center Research Report

This report presents another phase of a study on evaluation of paint stripes and glass beads. The results from the previous phases of this study indicated that large-scale, experimental evaluation of a 1.65 refractive-index bead and a large-gradation, 1.52 refractive-index bead was warranted. Poor embedment of beads, however, precluded the evaluation because the quick-drying paint used did not allow beads to be properly embedded. After progressive thinning of the paint with solvent, adequate bead embedment was obtained. Drying time, of course, was longer.

Attempts were made to obtain good embedment without extending the drying time. This included testing of a …