Nuclear Testing Of Asphaltic Concrete Pavement And Soil Subgrades
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Nuclear Testing Of Asphaltic Concrete Pavement And Soil Subgrades
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Author : National Research Council (U.S.). Highway Research Board
language : en
Publisher:
Release Date : 1962
Nuclear Testing Of Asphaltic Concrete Pavement And Soil Subgrades written by National Research Council (U.S.). Highway Research Board and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1962 with Asphalt categories.
Paper 1: The nuclear method of density determination can be applied successfully to density measurements of bituminous pavement. Paper 2: A description is given of the investigation made by the Colorado Department of Highways into the feasibility and practicality of using commercially available nuclear devices to perform moisture and density tests in the field on highway construction materials. The correlation found between nuclear and conventional methods is presented along with an explanation of the equipment and its basic functions.
Nuclear Testing Of Asphaltic Concrete Pavement And Soil Subgrades
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Author : F. Burggraf
language : en
Publisher:
Release Date : 1962
Nuclear Testing Of Asphaltic Concrete Pavement And Soil Subgrades written by F. Burggraf and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1962 with Asphalt concrete categories.
Nuclear Testing Of Asphaltic Concrete Pavement And Soil Subgrades Presented At The 41st Annual Meeting January 8 12 1962
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Author : Highway Research Board National Research Council Staff
language : en
Publisher:
Release Date :
Nuclear Testing Of Asphaltic Concrete Pavement And Soil Subgrades Presented At The 41st Annual Meeting January 8 12 1962 written by Highway Research Board National Research Council Staff and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.
Investigation Of Insulating Effect Of Materials On Subgrade
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Author : Wilbur J. Dunphy
language : en
Publisher:
Release Date : 1966
Investigation Of Insulating Effect Of Materials On Subgrade written by Wilbur J. Dunphy and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with Frost heaving categories.
Bibliography
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Author :
language : en
Publisher:
Release Date : 1966
Bibliography written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with Highway engineering categories.
Comparison Of The Performance Of All Bituminous Concrete And Reduced Subgrade Strength Highway Pavement Test Sections Under Freezing Conditions
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Author : Robert A. Eaton
language : en
Publisher:
Release Date : 1975
Comparison Of The Performance Of All Bituminous Concrete And Reduced Subgrade Strength Highway Pavement Test Sections Under Freezing Conditions written by Robert A. Eaton and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with Pavements categories.
Four highway pavement test sections were built at CRREL in July 1971. Two sections were designed using the Asphalt Institute full-depth criteria in which the pavement is placed directly upon the subgrade with no granular base course, and the other two were based on similar traffic volumes using the Corps of Engineers reduced subgrade strength criteria which incorporate a granular base course. The sections were constructed to compare and evaluate the performance of the two different concepts under freeze-thaw conditions. The first three years' observations are reported.
Accelerated Testing For Studying Pavement Design And Performance Fy 2003
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Author :
language : en
Publisher:
Release Date : 2008
Accelerated Testing For Studying Pavement Design And Performance Fy 2003 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Pavements categories.
The Midwest States Accelerated Pavement Testing Pooled Fund Program, financed by the highway departments of Missouri, Iowa, Kansas and Nebraska, has supported an accelerated pavement testing (APT) project to compare the performance of stabilized clayey embankment soil when Portland cement, fly ash, lime and a commercial product were used as stabilizing agents. The project aimed to improve the practices related to the design of flexible pavements when the top of the subgrade is improved by chemical stabilization. The experiments were conducted at the Civil Infrastructure Systems Laboratory (CISL) of Kansas State University. The test program consisted of constructing four flexible pavement structures and subjecting them to full-scale accelerated loading test. The study indicated that cement and lime are the most effective stabilizers for the studied soil. These stabilizers resulted in lower vertical compressive stresses at the top of the subgrade and lower rut depth at the pavement surface than the fly ash-treated soil. After more than two million axle load repetitions, the pavement with cement stabilized embankment soil exhibited much less surface cracking than the pavement with fly-ash stabilized embankment. The commercial product proved not to be effective in stabilizing the non-sulfate clayey soil used in this experiment, when the embankment is constructed at the same moisture content and compaction level as for the other three chemicals. The unconfined compression strength measured on laboratory prepared samples of soil stabilized with the commercial chemical compound was very similar to that of the untreated soil.
Publication Index Highway Research Board
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Author : National Research Council (U.S.). Highway Research Board
language : en
Publisher:
Release Date : 1960
Publication Index Highway Research Board written by National Research Council (U.S.). Highway Research Board and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1960 with Airports categories.
Experimental Ring No 4
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Author : Milan Krukar
language : en
Publisher:
Release Date : 1970
Experimental Ring No 4 written by Milan Krukar and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970 with Highway research categories.
Three different kinds of base material of varying base thicknesses were tested at the Washington State University Test Track on Ring #4 during the fall of 1968 and the spring of 1969. Twelve 18-foot test sections consisting of 4.5, 7.0, 9.5 and 12 inches of untreated crushed rock surfacing top course base; 2.0, 4.0, 6.0 and 8.0 inches of sand-asphalt base; and 0.0, 2.0, 3.5, and 5.0 inches of Class "F" asphalt concrete base, covered by a uniform 3.0-inch thick Class "B" asphalt concrete wearing course were tested during this period. The pavement structure was built on a clay-silt subgrade soil. Instrumentation consisted of moisture tensiometers, strain gages, pressure cells, LVDT gages and thermocouples for measuring moisture, strain, stress, dynamic deflections and temperatures. Benkelman beam readings were taken. The testing revealed that the fall failure modes were different from the spring failures. The fall failure pattern started from transverse cracks in the thin sections which developed into alligator cracking patterns. These cracks appeared after a period of cold weather and heavy rains followed by a warming trend. Thermal and mechanical loads in conjunction with adverse environmental conditions during construction and prior to and during the fall testing period were believed to be responsible for the early fall failures on the thin sections. The spring failures were very rapid and sudden and were due to environmental factors which led to highly saturated subgrade, thus resulting in poor bearing capacity. Punching shear was the failure mode. The thickest sections survived without cracks but developed severe rutting. Comparison of the results with those obtained from Rings #3 and #4, show that they were similar in many respects. This indicates that the test track is capable of replicating results and is a reliable research instrument. Equivalencies were developed for the different materials. On this basis the Class "F" asphalt concrete base was superior to the sand-asphalt and untreated crushed rock bases in that order. Maximum values for static and dynamic deflections, strains and stresses for different times and temperatures were developed. The lateral position of the dual tires with respect to the gage severely affected the strain, stress and deflection values. Temperature also caused variations in the measurements. Spring instrument readings for static and dynamic deflections, strain and stress show values as much as 2 to 4 times of those obtained in the fall. Spring subgrade conditions probably were responsible for these differences. Ring #4 series operational time was half that of Ring #3 and about the same as Ring #2. Ring #4 sustained about a quarter of the wheel load applications of Ring #3. Construction and testing environmental conditions were inferior to those for Ring #3, although they were similar for Ring #2 and hence contributed to the lower test period. This points out that environmental factors are very important in pavement life.
Highway Research News
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Author :
language : en
Publisher:
Release Date : 1963
Highway Research News written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1963 with Highway research categories.
Issues for 1963- include section: Urban transportation research digest.