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Geological Survey of Michigan Volume 8

Geological Survey of Michigan Volume 8


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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1900 Excerpt: ...small amount of silica soluble. This of course would remain in the body of the marl after the death of the plant. Certain shells are said to have the same power. The amount of silica in a good marl is very small. The soluble silica will not be in amount to help or hinder greatly, for, as may be seen in the analyses cited, it is but a fraction of a per cent. The insoluble silica is, however, higher in per cent and it is that which must be watched closely. It ought not to exceed three or four per cent for the reason that it interferes with the balancing of the silica and calcium content of the slurry and prevents the best burning of the mixture. Insoluble silica as sand is one of the most refractory substances known. It is not as finely divided as clay silica, does not make as intimate a mixture with the lime of the marl and dpes not flux so easily. Although sand marl cement can be made, sand is entirely out of place in the process used in Michigan, and should be guarded against carefully in the selection of raw material. Organic matter. Organic matter is a necessary evil in relation to marl. It is of no positive harm except that it increases the weight and bulk of marl without adding to it its usefulness. It is burned out as nearly as possible in the manufacture of cement and all that remains is ash. As noticed in the sample above given, where the calcium carbonate content falls suddenly it is nearly balanced by increase in organic matter. It has already been explained how profoundly organic matter influences the character of a bed. The law of its own variation can be depended upon to hold true where outside agents have not also contaminated the bed. It will also be noticed that in the very pure samples where organic matter is nearly absent the marl has but ...


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Product Details
  • ISBN-13: 9781236255563
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 250
  • Spine Width: 13 mm
  • Width: 189 mm
  • ISBN-10: 1236255569
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 454 gr

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