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Articles 571 - 600 of 992
Full-Text Articles in Civil and Environmental Engineering
Comparison Of Contained Rock Asphalt Mat (Cram) With Conventional Asphaltic Concrete Pavements, Herbert F. Southgate, David L. Allen, Robert C. Deen
Comparison Of Contained Rock Asphalt Mat (Cram) With Conventional Asphaltic Concrete Pavements, Herbert F. Southgate, David L. Allen, Robert C. Deen
Kentucky Transportation Center Research Report
A brochure proposing the use of "Contained Rock Asphalt Mat" (CRAM) provided a comparison of stress distributions throughout a CRAM structure (Figure 1) as compared to a conventional pavement (Figure 2). Experience has indicated that stress distributions do not always present the most sensitive or appropriate analysis of a pavement structure. Distributions of strains, and more particularly "work", are better indicators of load distributions throughout a pavement structure and subsequent performance.
Nondestructive Evaluation Of Rigid Pavements Using Road Rater Deflections [1984], Gary W. Sharpe, Mark Anderson, Robert C. Deen, Herbert F. Southgate
Nondestructive Evaluation Of Rigid Pavements Using Road Rater Deflections [1984], Gary W. Sharpe, Mark Anderson, Robert C. Deen, Herbert F. Southgate
Kentucky Transportation Center Research Report
Road Rater deflections have been used to determine in-place structural conditions of rigid and composite pavements, based on modifications of principles and experience with the structural evaluation of flexible pavements. Details of the use of elastic layer theory to simulate deflection measurements associated with loadings for the Kentucky Road Rater are presented. Included is an illustration of the use of field deflection measurements to "back calculate'" in-place moduli. The procedures are generally iterative and involve matching measured deflections with theoretical deflections. Elastic layer principles have been used to simulate deflections only at the midslab position. Relationships regarding deflections at other …
Pavement Thickness Designs Utilizing Low-Strength (Pozzolanic) Base And Subbase Materials, Gary W. Sharpe, Robert C. Deen, Herbert F. Southgate, Mark Anderson
Pavement Thickness Designs Utilizing Low-Strength (Pozzolanic) Base And Subbase Materials, Gary W. Sharpe, Robert C. Deen, Herbert F. Southgate, Mark Anderson
Kentucky Transportation Center Research Report
This paper presents information whereby laboratory test data for pozzolanic base and subbase materials may be combined with elastic layer theory and a limiting strain criterion to determine thickness designs equivalent to conventional asphaltic concrete and crushed stone pavement structures. A summary of laboratory testing in Kentucky also is presented. An example thickness design determination is presented and includes an economic comparison of alternative designs with the conventional asphaltic – crushed stone thickness design.
An Evaluation Of Pavement Drainage Interstate 64, Rowan-Carter Counties, David L. Allen, Herbert F. Southgate
An Evaluation Of Pavement Drainage Interstate 64, Rowan-Carter Counties, David L. Allen, Herbert F. Southgate
Kentucky Transportation Center Research Report
No abstract provided.
An Evaluation Of Elastizell Concrete As A Lightweight Fill Material, David L. Allen, Bobby W. Meade
An Evaluation Of Elastizell Concrete As A Lightweight Fill Material, David L. Allen, Bobby W. Meade
Kentucky Transportation Center Research Report
Near Northern Kentucky University in Campbell County, Kentucky, access ramps connecting I 275 and 3-Mile Road (shown in Figure 1) were constructed. During construction of those ramps, additional embankments were to be placed on an existing 6-foot by 5-foot box culvert. Both ramps, hereafter referred to as NKU-1 (the exit ramp from I 275) and NKU-2 (the entrance ramp to I 275), cross the culvert. The new embankments would result in fill heights, over the culvert of 30 feet at Station 39+14 of NKU-1 (Figure 2) and 47 feet at Station 11+68 of NKU-2 (Figure 3). The original fill height …
Thickness Design Procedure For Portland Cement Concrete Pavements, Herbert F. Southgate, Robert C. Deen
Thickness Design Procedure For Portland Cement Concrete Pavements, Herbert F. Southgate, Robert C. Deen
Kentucky Transportation Center Research Report
Past experience in Kentucky indicated that thickness designs using portland cement concrete best agreed with criterion used in the Portland Cement Association's design method for 2 or 3 million EAL's or less. For EAL's greater than 3 million, past experience best agreed with criterion developed from the AASHO Road Test.
Research reported herein indicates the two criteria become asymptotic at approximately 2.5 million EAL's. The merger of the criteria is presented, and the combined criterion is coupled with the principal of equal work as defined in classical physics to produce thickness design curves for portland cement concrete pavements. Research has …
A Field And Laboratory Compaction Study Of A Mixture Of Retorted And Raw Oil Shale From The Means Project In Montgomery County, David L. Allen, Bobby W. Meade
A Field And Laboratory Compaction Study Of A Mixture Of Retorted And Raw Oil Shale From The Means Project In Montgomery County, David L. Allen, Bobby W. Meade
Kentucky Transportation Center Research Report
The oil shale retorting process will produce large volumes of spent shale and some raw oil shale that cannot he used in the retorting process. Consequently, it is anticipated that on-site disposal embankments will be constructed using these materials A report by Drnevich, et al. (1) has recommended that site-specific compaction studies be done at the start up of a mining and disposal operation. Holtz 12) has reported on a detailed study of the compaction characteristics of a western oil shale that had been retorted by the Paraho vertical retort process.
This study was performed to develop background data on …
Rutting, A Case Study (Us 23, 1.5 Miles North Of Louisa), James H. Havens, Gary W. Sharpe, David L. Allen, Herbert F. Southgate
Rutting, A Case Study (Us 23, 1.5 Miles North Of Louisa), James H. Havens, Gary W. Sharpe, David L. Allen, Herbert F. Southgate
Kentucky Transportation Center Research Report
This case study of rutting in an asphaltic concrete pavement makes recourse to trenching full width and full depth to expose and observe the entire cross section of the structure. Rutting occurred in the vicinity of Station 59+00 on US 23, 1.5 miles north of Louisa, during August and September 1983 when traffic was diverted onto newly constructed northbound lanes (without final surface and shouldering) while excavation into the hillside was completed for the southbound lanes. Earth movers crossed the northbound lanes going to and from a waste area. Coal trucks (Figures 1 and 2) slowed, stopped, and crept where …