Re: How catastrophic is catastrophic?

[John Brownlee <jonnie@chronic.lpl.arizona.edu>]

	About concrete hulls, I seem to recall that permeability (as the
material is somewhat porous from a geological point of view) was also a
limiting factor, and that the concrete hull could fill with water through
pores before crushing. Because pore pressue can equal hydrostatic pressue,
this could be a rather important consideration. Treatments are often
applied to concrete to reduce porosity and permeability, but do they
continue to be as effective at high hydrostatic pressures?

							John

John Brownlee
Lunar and Planetary Lab
University of Arizona
jonnie @ lpl . arizona . edu