Other

Face International Corporation

Darrell L Darrow

Samuel A Face, Jr

Glenn F Rogers, Jr

Richard P Bishop

Bradbury R Face

Michael Davis

David Francis

Yuting Wang

Brad Face

A method of finishing concrete using a vibrating tool to consolidate a &ldquo;dry shake&rdquo; aggregate into the upper layer of the concrete. The use of the vibrating tool causes moisture within the concrete mass to migrate into the surface layer where the moisture may hydrate the aggregates in the dry shake mixture. The ability to cause upward migration of water in the concrete mass provides a larger window of finishability for the concrete. The vibrations also provide thorough consolidation of aggregates in the upper layer of the concrete mass helping to prevent delamination.

Method of finishing plastic concrete mixture

Vibrational energy is introduced into a portion of a liquid-solid work mixture at a natural resonant frequency of that portion of the mixture while that portion of the mixture is in a fluid or semi-fluid state. A vibrating apparatus imparts controlled vibrations either onto the surface or beneath the surface of the liquid-solid work mixture in sequential stages, the frequency of vibrations generally increasing with each subsequent stage, corresponding to an increase in the natural resonant frequency of the progressively-narrowing liquid portion at the top of the liquid-solid work mixture. A resonant frequency-indicative condition of the liquid portion of the work mixture adjacent the vibrator apparatus is sensed as the vibrator apparatus moves across the top surface of the liquid-solid mixture, and the output frequency of the vibrating apparatus is correspondingly adjusted in accordance with the sensed condition as the vibrator apparatus travels. The controlled vibrations drive the liquid component of the liquid-solid mixture upwardly out of the mixture, thereby advantageously expediting the rate of consolidation, stiffening, and/or drying of the lower (solid) portion of the mixture, and advantageously filtering, decanting, and/or otherwise isolating the constituent ingredients of the mixture.

Method of separating constitutent ingredients of mixtures by staged

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.

Apparatus of staged resonant frequency vibration of concrete

Method of staged resonant frequency vibration of concrete

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Norfolk, VA, United States of America

Darrell L Darrow