Method of staged resonant frequency vibration of concrete

Details Method of staged resonant frequency vibration of concrete Method of staged resonant frequency vibration of concrete

1993-12-03

1996-05-28

Fiorilla, Christopher A.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264 69, B28B 108, B29C 4322

Patent

active

055208622

ABSTRACT:
Vibrational energy introduced into plastic concrete structures, such as concrete slabs, decks and similar or related concrete structures, at or near the natural resonant frequency of the liquid concrete mass, expedites the consolidation and setting of the concrete. A vibrating apparatus imparts controlled vibrations either onto the surface or beneath the surface of the concrete mass in sequential stages, the frequency of vibrations generally increasing with each subsequent stage, corresponding to the increase in the natural resonant frequency of the progressively-narrowing liquid concrete at the top of the structure. The relatively more consolidated and more dry concrete (typically near the bottom of the slab) is substantially unaffected by the non-resonant frequencies vibrations. In one modification, sensors determine the resonant frequency of the liquid concrete mass during each pass of the vibrator apparatus, and the frequency of the vibrating member is automatically adjusted, accordingly. The number of stages, the amplitude of the vibrations, the physical orientation of the vibration-producing apparatus, the time duration in each stage, is variable depending upon the physical characteristics of the concrete mass.

REFERENCES:
patent: 2015217 (1935-09-01), Deniau
patent: 2223734 (1940-12-01), Mall
patent: 2269109 (1942-01-01), Jackson
patent: 2293962 (1942-08-01), Baily
patent: 2332687 (1943-10-01), Baily
patent: 4579697 (1986-04-01), Takano

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