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Preliminary estimate of production of Portland cement in 1910

Publisher
Elsevier Science
Year
1911
Tongue
English
Weight
48 KB
Volume
171
Category
Article
ISSN
0016-0032

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โœฆ Synopsis

CURRENT TOPICS.

various modifications is still retained as the service powder. Originally it consisted of insoluble nitrocellulose 68.21 per cent., soluble nitrocellulose 29.79 per cent. and paraffin 2.00 per cent. This was gelatinized with ethyl acetate and made in the flake form. Later this was modified and the composition became insoluble nitrocellulose 29.13 per cent., soluble nitrocellulose 41.31 per cent., BaNOa 19.00 per cent. KNO3 8.o0 per cent. and Na2COs 2.oo per cent. This was gelatinized first with ether alcohol and later with methyl alcohol. Recently a pure nitrocellulose powder, containing certain stabilizers has been adopted.

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## 531 before mentioned, the total length of the test may be altered as required. ## EXPANSION OF NEAT PORTLAND CEMENT IN STEAM.