Engineering Commons^™

The Irish Plumber And Heating Contractor, June 1962 (Complete Issue)

Building Services Engineering

No abstract provided.

Comments On: Aasho Interim Guide For The Design Of Rigid Pavement Structures (Aasho Committee On Design, February, 1962), James H. Havens, Ronald D. Hughes

Kentucky Transportation Center Research Report

We have reviewed the AASHO Interim Guide for the Design of Rigid Pavement Structures, and Messrs. Havens and Hughes of our staff have prepared comments on the guide. These comments do not deal entirely with the rigid pavement guide, but rather compare some of the design concepts from the Flexible Pavement Interim Guide.

The Application Of Nuclear Techniques To The Measurement Of Moisture And Density Of Highway Construction Materials, Robert C. Deen, J. D. Shackelford

Kentucky Transportation Center Research Report

In recent years much attention has been directed toward the application of neutron and gamma ray techniques to soil moisture and density measurements. This application of radiological measurements of these characteristics of materials of highway construction, of course, is of great interest to the highway industry since the performance of the total pavement system is highly dependent upon the condition of the embankment, subgrade, and base components of this system. An important measure of the state of condition of unconsolidated earth materials is their unit weights and moisture contents. The highway engineer undoubtedly would welcome any method or technique which …

The Irish Plumber And Heating Contractor, May 1962 (Complete Issue)

Building Services Engineering

No abstract provided.

The Irish Plumber And Heating Contractor, April 1962 (Complete Issue)

Building Services Engineering

No abstract provided.

Pavement Roughness Studies (A Progress Report), Rolands L. Rizenbergs

Kentucky Transportation Center Research Report

Road roughness testing in Kentucky was first reported in 1949 (1). At that time, emphasis was placed on localized irregularities in pavement profiles detectable by a roller-type straight edge. The experience gained then pointed to the necessity for making a fast, continuous recording of characteristics of the road which would be more closely related to riding quality. Subsequent progress reports (2)(3) dealing with the development of triaxial acceleration as applied to the evaluation of pavement riding qualities emphasized riding comfort or discomfort. The accelerations monitored then were evaluated in terms of g's per seconds or "jerk", which is considered by …

Engineering Properties For Soil Series Mapped In Kentucky, Robert C. Deen

Kentucky Transportation Center Research Report

Soil maps, and particularly engineering soil maps, are proving to be desirable in the planning and design stage of many types of structures and land developments. Problems associated with foundations, drainage and soil behavior may be recognized at a very early stage during the preliminary location and site selection through the use of adequate soil maps.

The Irish Plumber And Heating Contractor, March 1962 (Complete Issue)

Building Services Engineering

No abstract provided.

The Irish Plumber And Heating Contractor, February 1962 (Complete Issue)

Building Services Engineering

No abstract provided.

Pavement Roughness Studies, James H. Havens

Kentucky Transportation Center Research Report

During 1961, the equivalent of about 800 lane-miles of pavement were tested and analyzed. The largest portion of this mileage was on completed Interstate projects. In November, three pavements selected by the Bureau of Public Roads for serviceability-index ratings (6) were tested; and these are discussed briefly in this report.

Periodic surveillance of the roughness of all of the roads presently listed in Tables 1 and 2 is contemplated. New primary and Interstate construction will be included in the future. Thus, each respective project may be eventually characterized by a history of roughness measurements.

An Evaluation Of Four Retarding Admixtures In Structural Concrete, Milton Evans Jr., Ralph R. Waddle

Kentucky Transportation Center Research Report

Early in 1960, the Construction Division was becoming quite concerned with the growing problem of obtaining satisfactorily smooth reinforced concrete bridge decks. Increasing areas of new decks were not measuring up to requirements when checked with a straight-edge, and rough-riding surfaces were resulting even after corrective grinding. It appeared that, on large pours, perhaps more time for placing and finishing was needed; this was so particularly on hot, windy days when ambient conditions would cause the concrete to set more rapidly. A proposed method of providing more working time was to use retarding admixtures to slow the setting time of …

Base Stabilization Bryantsville-Beuna Vista Road, Garrard County, Robert C. Deen

Kentucky Transportation Center Research Report

Construction plans for the summer of 1961 called for the placement of a bituminous surface (Class C-1) on Ky. 753 in Garrard County (see Fig. 1). The project extends from US 27 in Bryantsville to Ky. 152 at Beuna Vista, a distance of approximately 2.8 mites. To prepare the roadbed for this bituminous surfacing, personnel of the Maintenance Division placed additional stone on the roadway and stabilized it with calcium chloride. The Research Division was requested to make recommendations as to application rates of the available stone and calcium chloride and to follow the general performance of the project.

Pavement Slipperiness Studies (A Progress Report), James H. Havens, Rolands L. Rizenbergs

Kentucky Transportation Center Research Report

Traction or frictional resistance of tires on clean, dry pavements tends to be fairly high (coefficient of friction of 0.6 to 0.8) and to be independent of the texture of the pavement surface. In contrast, the loss of traction on a wet pavement is due entirely to lubrication effects; and, while wet friction seems to be fairly independent of the identity of the aggregate, it is extremely dependent upon the texture and porosity of the surface. Likewise, the mineralogical and lithological characteristics of the aggregates largely determine the natural texture, i.e., type of wear (coarse or fine) which the aggregate …

Cutback Asphalt Emulsion Primer, Type L, Nelson County, Project Rs Group 38 (1961), J. D. Shackelford

Kentucky Transportation Center Research Report

Personnel of the Research Division visited the Nelson County project to observe the application and behavior of the cutback asphalt emulsion primer, Type L, on Ky. 733, northeast of Boston. The following remarks concerning this project are submitted for your information.

Second Annual Performance Survey Of Reinforced Concrete Pipe Culverts, Ronald D. Hughes

Kentucky Transportation Center Research Report

A criteria for the design and installation of reinforced concrete pipe culverts was developed by the Bureau of Public Roads in cooperation with the American Concrete Pipe Association and distributed to the various highway agencies in April, 1957, under Circular Memorandum 22-40. This criteria was developed in order to bring together and simplify methods for computing necessary pipe strengths for use under various heights of fill and provide for more effective utilization of reinforced concrete pipe for use as culverts. The memorandum also described various methods for bedding reinforced concrete pipe and outlined procedures for installation of the pipe under …

Evaluation Of Calcium-Chloride Maintained, Traffic-Bound Roads, George R. Laughlin

Kentucky Transportation Center Research Report

Calcium chloride has been used on unpaved road surfaces for over fifty years. Originally, it was used as a dust palliative and later as a stabilizing agent. Observations have shown that traffic-bound roads containing well-graded aggregate and sufficient binder tend to have smooth, stable surfaces. While the binder remains in a damp, cohesive state, the road surface remains in a smooth, compact condition. If the surface becomes dry, dusting and attrition becomes pronounced. Therefore, for a properly constructed traffic-bound base to remain in smooth, stable condition, it is essential that the surface remain damp. Calcium chloride, being a hygroscopic and …

Class I, Type B, Plant-Mix Initial Treatment, Pac-9, Robert L. Florence

Kentucky Transportation Center Research Report

Initial surface treatments of so-called traffic-bound macadam rural secondary roads presents a challenging but frustrating problem in the over-all highway program. In many cases, these roads do not merit the expenditures that would be needed to construct the type of pavement desired, yet there is a need for a dust-free, all-weather type of surface for these roads. It may be argued, for instance, that initial surfacing should be deferred until such time that the construction of a proper base and surface would be justified. On the other hand, one might argue that even a light surfacing would be preferred despite …

Dynamics Of Sprung Loads On Pavements, James H. Havens, D. F. Hutcheson

Kentucky Transportation Center Research Report

The attached report, "Dynamics of Sprung Loads on Pavements," resulted from a need for reliable impact factors for use in the structural design of pavements. For some years, it has been customary to use 1.2 times the static wheel load for designing portland cement concrete pavements. We, along with other investigators, have questioned this value, and have actually used higher values for some specific conditions. Impact factors for specific situations are listed on page 33 of the report. The three roads classed as smooth averaged 1.25, while the rough road gave a value of 1.35. Depressions at culverts and bridge …

A Modified Class I Surface Mixture, Robert L. Florence

Kentucky Transportation Center Research Report

Since the summer of 1954, it has been the practice of the Department to require only natural. sand or slag as the fine aggregate in high-type (Class I, Type B) bituminous surface mixtures. This, of course, was done in order to build skid resistance into the mixture, i.e. by use of polish-resistant fine aggregate. At first, this was specified by means of plan notes; and, during 1957, an Amendment was made to the Standard Specifications. While this has apparently reduced the slickness problem it has created problems relating to the durability and, at times, the stability of the surface course.

Seal Coat Application To Clark Memorial Bridge, Robert C. Deen

Kentucky Transportation Center Research Report

The maintenance of the surface of the approach ramps and bridge deck of the Clark Memorial Bridge in Louisville has presented certain problems over the past few years. The ramps at each end of the bridge are rather steep, and on the Louisville side the ramp intersects Main Street where traffic movements are controlled by traffic signals. Thus, the northbound traffic accelerating upgrade from a stop and the southbound traffic braking to a stop on the downgrade present two very severe conditions that the surface must withstand. The increased use of salt for snow and ice removal has also contributed …

Experimental Paving Projects Using Curtiss-Wright’S Coal-Modified, Coal-Tar Binder [1962], William B. Drake

Kentucky Transportation Center Research Report

This report covers the observation and evaluation of 13 sections of experimental pavement constructed in Kentucky using coal-modified coal-tar binder. These are compared with the performance of control sections in which normal specification asphalt cements were used. The results of laboratory and field tests are also reported to support and supplement the visual surveys.

The Irish Plumber And Heating Contractor, January 1962 (Complete Issue)

Building Services Engineering

No abstract provided.

The Irish Plumber And Heating Contractor, December 1961 (Complete Issue)

Building Services Engineering

No abstract provided.

The Irish Plumber And Heating Contractor, November 1961 (Complete Issue)

Building Services Engineering

No abstract provided.

The Irish Plumber And Heating Contractor, October 1961 (Complete Issue)

Building Services Engineering

No abstract provided.

The Irish Plumber And Heating Contractor, September 1961 (Complete Issue)

Building Services Engineering

No abstract provided.

The Irish Plumber And Heating Contractor, August 1961 (Complete Issue)

Building Services Engineering

No abstract provided.

The Irish Plumber And Heating Contractor, July 1961 (Complete Issue)

Building Services Engineering

No abstract provided.

The Irish Plumber And Heating Contractor, June 1961 (Complete Issue)

Building Services Engineering

No abstract provided.

Transient Sensitivity Of Piezoelectric Accelerometers, William E. Baker

Electrical and Computer Engineering ETDs

No abstract provided.