> > When using an expansive ("hydraulic") cement, is it possible that the
> > expansion could cause cracking in the existing structure due to too much
> > expansion?
> >
> > I have a pipe with an OD of about 4" going through a 6" hole in a
> > concrete slab, so there is a 1" gap around the pipe.
> >
> > The edge of the hole is just a couple inches from the wall, meaning that
> > the hole is close to the edge of the slab.
> >
> > If I fill the gap with an expansive cement, do I risk cracking the slab? > No, but
> Why use expansive cement? It's not intended for that purpose.
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