Mechanical Engineering Department
BS in Mechanical Engineering
Joseph D. Mello
CVBT (Center for Vocational Building Technology) teaches villagers in Northeastern Thailand how to make various concrete products. Many of these products require the use of a vibration table in order to remove air and water trapped within the concrete. Removal of these voids improves the outside surface of the molded concrete, and also allows the use of a lower water to cement ratio, allowing a much stronger finished product. The currently used vibration table (VT3) has several disadvantages associated with it, which the new table (VT4) eliminates. Compared with the VT3, the VT4 has a more rigid tabletop and improved suspension system in order to vibrate the concrete within the wooden mold frames and maintain the integrity of concrete molds. Additionally, with the use of a single Damping Mass of 10 kg, the VT4 outputs the required amplitude of 0.3 to 0.4 mm and frequency of 3900±200 RPM to correctly consolidate concrete ranging from 2 to 40 kg. Furthermore, as desired, the VT4 uses the same motor and support frame as the VT3.