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Proceedings of the Linnean Society of New South Wales (26)

Proceedings of the Linnean Society of New South Wales (26)


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About the Book

Volume: 26 General Books publication date: 2009 Original publication date: 1902 Original Publisher: Linnean Society of New South Wales. Subjects: Natural history Botany Nature / General Nature / Essays Nature / Plants Science / Life Sciences / Botany Science / Earth Sciences / Geology Notes: This is a black and white OCR reprint of the original. It has no illustrations and there may be typos or missing text. When you buy the General Books edition of this book you get free trial access to Million-Books.com where you can select from more than a million books for free. Excerpt: BACTERIA AND THE DISINTEGRATION OF CEMENT. By R. Greio Smith, M. Sc., Macleay Bacteriologist To The Society. Occasionally the cement work of water canals and reservoirs disintegrates below the water level, and instead of showing a smooth and apparently hard face, the surface is seen to be more or less eroded. When struck with a pick, the cement easily comes away, and a porous internal structure is revealed. The cement matrix has disappeared, and the sand, grit and stones are practically all that remain. Above the water line the cement remains quite hard, and shows no sign of disintegration. Stutzer and Hartleb investigated such a case, and as a result of their work, they considered that the nitrous organisms -- that is. bacteria which convert ammonia into nitrous acid -- might assist in the decomposition of the cement, through the production of nitrous acid, which dissolves the lime forming the soluble calcium nitrite. They worked upon a sample of brownish coloured mud taken from the bottom of the Bonn water reservoir. Chemically it proved to be disintegrated cement, and bacteriologically it wa: found capable of causing the nitrification of a solution of ammonium sulphate. Barth, t in publishing his experience with hydraulic cements, said that a destruction of the cement might take place in so relatively short a time as three years. In the case which came nndcr his notice, the...


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Product Details
  • ISBN-13: 9781150696862
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 152 mm
  • No of Pages: 564
  • Spine Width: 32 mm
  • Width: 229 mm
  • ISBN-10: 1150696869
  • Publisher Date: 23 Dec 2009
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 816 gr


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