
Concrete Volume 15
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. 1919 Excerpt: ...made in a 200,000-lb. Olsen machine. A spherical bearing block was used on top of the compression specimens during the test. A special apparatus (Fig. 9) was designed and constructed for use ...
Paperback: 276 pages
Publisher: RareBooksClub.com (May 22, 2012)
Language: English
ISBN-10: 1236447425
ISBN-13: 978-1236447425
Product Dimensions: 7.4 x 0.6 x 9.7 inches
Format: PDF Text TXT ebook
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n measuring the elongation and contraction of 6" x 12" cylinders. It consists essentially of a framework for holding the cylinder in an inclined position in V-shaped seats and means for accurate measurement of changes in length. The lower end of the cylinder rests against a 2" circular plate with a spherical seat. The change in length is measured by means of an Ames dial graduated to.001", which makes contact with the cylinder through a second 2" plate with spherical seat. Concrete Improved by Rodding By F. E. Giesecke Head Of Division Of Engineering University Of Texas, Austin, Texas (A partial review of a series of tests on improving concrete by rodding, conducted at The University of Texas, was published in a previous issue of Concrete.1 Here are presented the conclusions drawn at the completion of this work.--Editor) It has been found that "rodding" concrete (working a pointed rod of about %" dia. into and around the soft mixture to allow the excess water and the entrapped air to escape upward and thus to compact the aggregate), adds considerably to its strength. In a series of tests made at the University of Texas, to determine the physical properties of dense concrete as affected by the relative quantity of cement,2 only sufficient mixing water was used to secure a concrete of workable consistency. For comparison, however, a few specimens were prepared with an excess of water which produced a very considerable reduction in strength. In practical operation, however, it is almost necessary to use enough excess water to make t...
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