Safety Maintenance & Production Volume 4

Safety Maintenance & Production Volume 4

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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. 1902 edition. Excerpt: direction by Mr. P. C. Pearson in December, 1901, and it is my purpose to report upon this and some later observations as a preliminary to more work of the same nature now under way. It has been held by several engineers that the mere alkaline nature of Portland cement was a sufficient guarantee of its protecting steel from rusting. There is, of course, good chemical reasoning for this, the familiar use of strong alkaline solution in boilers to prevent the formation of scale being based upon the same principle. This would seem to settle the matter once and for all, were it not a fact that steel bedded in concrete has corroded very rapidly, while other steel in a different concrete of the same kind of cement stands without change for ten years or more. The investigation was started not to find out that steel could not to be protected by concrete or that it could be, for on that point we were sure, to start with, but we have tried to find a reason for occasional failure and to suggest a remedy. An examination of several cases where expanded metal had been embedded in concrete showed plainly that wherever the steel was exposed through cracking rusting began, even though the cracks were very fine. It would seem that the alkaline nature of the cement would be sufficient to prevent corrosive action occurring PLATE I.--STEEL PROTECTED BY CEMENT. within a few hundredths of an inch on the moist surface of the steel, but such is not always the case. To study the matter systematically, two brands of American Portland cement (Alpha and Lchigh) were selected; two kinds of cinders, one from the Sugar Refinery, the other from the Boston & Albany locomotives; a sharp, clean beach sand; and a hard, clean broken stone, the larger part being fragments of...
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Product details

  • Paperback | 232 pages
  • 189 x 246 x 12mm | 422g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236549953
  • 9781236549952