trass

American  

[tras] / træs /

noun

1. a light-colored type of volcanic tuff used in making water-resistant cement and mortar.

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trass British  

/ træs /

noun

1. a variety of the volcanic rock tuff, used to make a hydraulic cement

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Etymology

Origin of trass

First recorded in 1790–1800; from Dutch trass, from earlier terass, tieras, tiras “brick dust, rubbish,” from French terrasse; see terrace ( def. )

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Example Sentences

See Examples For:

trass

In this case, also, the addition of finely-ground silica, or trass, improved the resisting power of blocks made with poor mortars, but did not have any appreciable effect on the stronger mixtures.

From The Sewerage of Sea Coast Towns by Henry C. Adams

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

From Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" by Various

Mixing very finely-ground silica, or trass, with the cement proved an advantage where a weak mixture was employed, but in the other cases no benefit was observed.

From The Sewerage of Sea Coast Towns by Henry C. Adams

He proposed to neutralise this action by adding to the mortar materials rich in silica, such as trass, which would combine with the lime.

From The Sewerage of Sea Coast Towns by Henry C. Adams

The tufaceous alluvium called trass, which has covered large areas in the Eifel, and choked up some valleys now partially re-excavated, is unstratified.

From The Student's Elements of Geology by Sir Charles Lyell

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