History of Concrete

	Revision 11 . . (edit) October 2, 2001 11:50 pm by Mike dill [change limestone to cement as limestone makes mortar, not concrete]
	Revision 10 . . (edit) October 2, 2001 6:51 pm by Anders Torlind [Adding reference to romans (I declare that Wikipedia must support international characters)]
	Revision 7 . . April 4, 2001 12:23 am by (logged).207.223.xxx

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Difference (from prior major revision) (minor diff, author diff)

Removed: 3,4d2

Confusingly, philosophers sometimes refer to trope?s, or property-instances (e.g., the particular redness of this particular apple), as '[abstract particular]?s'.

Changed: 7c5

/Talk?

In construction? Concrete is a building material made from sand? or other small stones, water, and cement. After mixing the cement hydrates and eventually dries out into a stone. Concrete was invented in the Roman Empire, but the knowledge of its making was lost, to be reinvented only in modern times.

Changed: 9c7

Concrete is a building material made from sand, water, and limestone that in a mostly liquid form and that eventually dries out into a stone.

/Talk?