Accession Number : AD0695615

Title :   STUDY OF VIBRATION OF CONCRETE. REPORT 2. MECHANICAL IMPEDANCE MEASUREMENTS.

Descriptive Note : Technical rept.,

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS

Personal Author(s) : Sullivan,Billy R.

Report Date : AUG 1969

Pagination or Media Count : 23

Abstract : Work was conducted as part of a continuing study of the mechanics of consolidation by internal vibration of fresh concrete. Measurements of mechanical impedance, which is related to the energy transfer from the vibrator to the concrete, can be used in a systems-science approach to select an optimum frequency of vibration for a concrete-vibrator system. The particular system chosen for this study indicated the mechanical impedance to be a minimum for frequencies of vibration around 200 cps. Due to high damping in the concrete mixture the resonance peak is relatively broad and, therefore, the frequency can be varied within practical limits with little loss in the energy transfer. (Author)

Descriptors :   (*CONCRETE, VIBRATION), COMPACTING, MECHANICAL IMPEDANCE, MEASUREMENT, DENSITY, STRUCTURAL PROPERTIES

Subject Categories : Laminates and Composite Materials
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE