The Building Materials Of Otago And South New Zealand Generally

Paperback | October 12, 2012

byWilliam Newsham Blair

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1879 edition. Excerpt: ...seen that the core is almost pure lime, and the exterior of the ball nothing but clay; while in many cases the quantity of lime is equal in different sized boulders. Dr. Hector analyzed the whole mass of the nodule, including the calcareous veins, and found it to contain 72 per cent. of carbonate of lime, but freed from the veins the yield of lime was only 59 per cent. The stone in No. 13, Table IV., should furnish an eminently hydraulic lime, but the produce of No. 12, Table II., which, Professor Black says, is a fair representation of the Moeraki boulders, would be a poor lime of very inferior quality. Experiments.--Practical experiments made with cement from Moeraki boulders, are equally irregular and unsatisfactory. Mr. J. T. Thomson manufactured a considerable quantity in 1868, and tested it against Portland cement in the following manner:--Two bricks were laid together with mortars of the two cements, and kept a month in water, and a fortnight dry. The highest results obtained were, with Moeraki mortar, three to one, and Portland,, one to one; it took 400 pounds in both cases to tear asunder the bricks. Assuming they were placed crosswise, this would give a tensile strength of 22 pounds per square inch. About the same time, Mr. G. M. Barr got an unmixed sample that stood 150 pounds in 24 days, against 110 for Portland cement under the same conditions. These comparisons are not, however, fair to the imported article, as the samples tested must have been of a very inferior quality. Instead of 25 pounds in the first experiment, ordinary Portland cement should have stood 140, and instead of 110 in the second, the resistance should have been 270 pounds. Mr. John Macgre-gor also tested the Moeraki cement, but the result was less...

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1879 edition. Excerpt: ...seen that the core is almost pure lime, and the exterior of the ball nothing but clay; while in many cases the ...

Format:PaperbackDimensions:58 pages, 9.69 × 7.44 × 0.12 inPublished:October 12, 2012Publisher:General Books LLCLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:0217623174

ISBN - 13:9780217623179

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