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Encyclopedia Britannica



TRASS

This article appears in Volume V27, Page 215 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: TOO-TUM
TRASS , the local name of a volcanic
tuff
  occurring in the
Eifel
 , where it is worked for hydraulic mortar. It is a grey or cream-coloured fragmental
rock
 , largely composed of pumiceous dust, and may be regarded as a trachytic
tuff
 . It much resembles the Italian puzzolana and is applied to like purposes. Mixed with lime and sand, or with
Portland
  cement, it is extensively employed for hydraulic
work
 , especially in Holland; whilst the compact varieties have been used as a building material and as a fire-stone in ovens. Trass was formerly worked extensively in the Brohl valley and is now obtained from the valley of the Nette, near Andernach.


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