Trass in A Sentence

    1

    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.

    2

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

    3

    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.

    4

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

    5

    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.