File:An investigation of hooped concrete columns (1914) (14754514716).jpg

Identifier: investigationofh00thom (find matches)
Title: An investigation of hooped concrete columns
Year: 1914 (1910s)
Authors: Thomas, Howard Rice
Subjects: Columns, Concrete Theses
Publisher:
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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reat deal of labor that evenapproximately straight columns we^e secured. For the 20-ft.columns the forms were put together around the spirals whilelying on the floor after they had been straightened out as muchas possible. The forms were then rolled on to a ladder and lift-ed into place by means of a hoist. It was necessary to useseveral braces to hold them straight after raising them. The forms for the other two sizes of column were alsoput together while they were lying down, but they were rigid e-nough not to have to use a suppot for raising them. After four of the 20-ft. columns had been made withthe sectional forms, it was found that none of them wasperfectly straight and that one (8919) was too crooked to beworth taking, certain parts being about 1 in. out of alignment.It was decided that the tests of such crocked columns wouldhave no value, and that it was not worth while to make any moreunless straight ones could be eecured. Finally it was decided to use a piece of 13-in. pipe
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12 the full length cf the column as a form. This pipe was splitinto four sections, for ease in removing, and sufficient narrowwooden strips were used between the sections to allow for thevariation in diameters of the different spirals. The sectionswere held together by bands placed close enough together toprevent the pressure of the wet concrete from causing thewooden strips to bulge out. By the use of this form, the last five of the 20-ft.columns were made almost perfectly straight. 4. Fabrication.- The concrete in all these columnswas mixed in a l/3 yd. Mar<£h-Capron mixer. The work was doneunder the direction of Mr. D. A. Abrams,by mem experienced inmaking concrete, who havemade the test specimens used in thelaboratory for a number of years. The materials were measured inbuckets, and then weighed as a check on the measurements. Thematerials were thoroughly mixed while dry, and then mixed forfive minutes after the water was added. Enough water was usedto give a medium wet mixtur

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