Trass sentence example

trass
  • When lime is used as a matrix, certain natural earths such as pozzuolana or trass, or, failing these, powdered bricks or tiles, may be used instead of sand with great advantage.

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  • They are mostly of volcanic origin, and include pumice, tufa, santorin earth, trass and pozzuolana itself.

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  • Generally speaking, they are only of local importance, their cheapness depending largely on the nearness and abundance of some suitable volcanic deposit of the trass or tufa class.

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  • It is evident that this will form a pozzuolanic cement if a suitable silicious material such as trass is added to the cement.

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  • Ordinary mortar failed in such positions; mortar made from lime prepared from limestones or chalks containing a little clay was found to stand; mortar made from lime mixed with trass or similar active silicious material was also found to stand.

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