EXPERIMENTAL STUDY ON CONCRETE PERMEABILITY AFFECTED BY ENVIRONMENTAL VIBRATION

Abstract

This study investigates the effect of environmental vibrations on concrete permeability. Based on published field measurement data and relevant references, two different sinusoidal vibration parameters (5 Hz/4 mm and 20 Hz/2 mm) are selected and applied to a newly constructed concrete by a vertical vibrating table and AC impedance technique. The concrete permeability is examined, and the influence of some factors including different vibration time (before initial curdle, between initial curdle and finial curdle, and after final curdle) and different vibration energy are discussed. From the experimental results, the following conclusions can be drawn. Irrespective of whether or not the concrete is vibrated, the uniformity inside the concrete along the direction of concrete pouring is more discrete in the upper and lower part of the concrete. Furthermore, the permeability at both ends of the concrete is larger than that in the middle portion. The newly constructed concrete's permeability is increased when the vibration energy is lowered, and decreased when the vibration energy is increased, and the new constructed concrete permeability affected by environment vibration obviously before initial curdle time.