A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Measuring Railroad Ballast Modulus of Elasticity Using Light Weight Deflectometer
Light weight deflectometers (LWDs) are used to rapidly determine the modulus of elasticity and spring constant of granular materials and pavements. The LWD can be operated by one person making it incredibly efficient to collect this important data. It is primarily used in the field to determine the properties of soils or paving materials, but also has the potential to be used on railroad ballast. However, to date, there have been minimal studies using LWDs on railroad ballast. The goal of this current study was to investigate the repeatability of LWD testing on prepared cylindrical ballast specimens. To use the LWD on ballast, we conducted minimum and maximum density tests in accordance with ASTM D4254 on 12-inch interior diameter by 12-inch interior height cylinder specimens at different percentages of fouling ranging from 0 to 60% by mass. Then, the LWD measurements were taken on the top of the specimen using a 12-inch-diameter plate. In total, 100 measurements were made on minimum density mixtures and 50 maximum density mixtures. The effect of density and fouling on test repeatability and procedural best practices for LWD testing on cylindrical ballast specimens are discussed.
Measuring Railroad Ballast Modulus of Elasticity Using Light Weight Deflectometer
Light weight deflectometers (LWDs) are used to rapidly determine the modulus of elasticity and spring constant of granular materials and pavements. The LWD can be operated by one person making it incredibly efficient to collect this important data. It is primarily used in the field to determine the properties of soils or paving materials, but also has the potential to be used on railroad ballast. However, to date, there have been minimal studies using LWDs on railroad ballast. The goal of this current study was to investigate the repeatability of LWD testing on prepared cylindrical ballast specimens. To use the LWD on ballast, we conducted minimum and maximum density tests in accordance with ASTM D4254 on 12-inch interior diameter by 12-inch interior height cylinder specimens at different percentages of fouling ranging from 0 to 60% by mass. Then, the LWD measurements were taken on the top of the specimen using a 12-inch-diameter plate. In total, 100 measurements were made on minimum density mixtures and 50 maximum density mixtures. The effect of density and fouling on test repeatability and procedural best practices for LWD testing on cylindrical ballast specimens are discussed.
Measuring Railroad Ballast Modulus of Elasticity Using Light Weight Deflectometer
Lecture Notes in Civil Engineering
Tutumluer, Erol (editor) / Nazarian, Soheil (editor) / Al-Qadi, Imad (editor) / Qamhia, Issam I.A. (editor) / Akey, Emily Katherine (author) / Jones, Mariel W. (author) / Ho, Carlton L. (author) / Rubin, Aaron J. (author)
2021-08-05
10 pages
Article/Chapter (Book)
Electronic Resource
English
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