A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Seismic Test for Compaction of Embankment, Base Course, and Pavement Layers
Seismic velocity measurements were correlated with in-place density tests (sand cone, balloon, oil displacement, etc.) in research to establish new non-destructive test procedures for use in highway construction. Using small, single-channel, hammer-impact type seismic units, a 3 to 5 minute test period is practical. Time of wave travel is measured at 0.5-foot intervals over a 1.5-foot distance over a 6-inch compacted layer. A time-distance graph is developed, the reciprocal of the slope being equated to the measured velocity. Secondary wave arrivals believed to be shear or Rayleigh waves were used in a computation of Poisson's ratio. The findings presented were based, in large part, on field tests on active construction projects. The data for 254 tests correlating seismic velocity and standard inplace density measurements on compacted roadway layers indicated an essentially straight-line relation exists between the two. Standard deviations from the straight line ranged from an average of 2.30 percent and 2.20 percent of maximum dry density for tests made on granular and subgrade materials, respectively, to 0.67 percent of laboratory density for tests made on bituminous materials.
Seismic Test for Compaction of Embankment, Base Course, and Pavement Layers
Seismic velocity measurements were correlated with in-place density tests (sand cone, balloon, oil displacement, etc.) in research to establish new non-destructive test procedures for use in highway construction. Using small, single-channel, hammer-impact type seismic units, a 3 to 5 minute test period is practical. Time of wave travel is measured at 0.5-foot intervals over a 1.5-foot distance over a 6-inch compacted layer. A time-distance graph is developed, the reciprocal of the slope being equated to the measured velocity. Secondary wave arrivals believed to be shear or Rayleigh waves were used in a computation of Poisson's ratio. The findings presented were based, in large part, on field tests on active construction projects. The data for 254 tests correlating seismic velocity and standard inplace density measurements on compacted roadway layers indicated an essentially straight-line relation exists between the two. Standard deviations from the straight line ranged from an average of 2.30 percent and 2.20 percent of maximum dry density for tests made on granular and subgrade materials, respectively, to 0.67 percent of laboratory density for tests made on bituminous materials.
Seismic Test for Compaction of Embankment, Base Course, and Pavement Layers
R. W. Moore (author)
1973
39 pages
Report
No indication
English
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