There were many things to be brought up from the beach and stored in the outhouse — as oars, nets, sails, cordage, spars, lobster-pots, bags of ballast, and the like; and though there was abundance of assistance rendered, there being not a pair of working hands on all that shore but would have laboured hard for Mr. Peggotty, and been well paid in being asked to do it, yet she persisted, all day long, in toiling under weights that she was quite unequal to, and fagging to and fro on all…
There are no more uses of "ballast" in the book.
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Without ballast, the ship will roll too much.
...she looked at the marked passages [of the manuscript] and was surprised to find that all the moral reflections—which she had carefully put in as ballast for much romance—had been stricken out.