Industry in general uses an enormous variety of rotating machinery,
the greater number of which are mounted on some type of concrete
foundation, or plinth. Frequently, the amount of time and effort spent
on the design and construction of the foundations, and on the allimportant
interface area between machine and foundation, does not
seem to be commensurate with the value of the installation as a whole.
Many problems directly attributable to the foundation size and shape,
or to inherent weaknesses in the concrete material, have been noted
over the years. Mechanical problems have arisen from the inability of
the foundation to operate as a good vibration damper. Problems related
to the the use of unsuitable grouting materials are also frequently
This paper attempts to examine some of the main problems affecting
machinery foundations, and to point out some repair procedures that
have worked well. It also points out the importance of properly designed
and constructed foundations, and the desirability of using polymer
based machinery grouts.