The Determination of the Mobility of Materials and Mixtures Used in Making Concrete: Thesis (Classic Reprint)

Excerpt from The Determination of the Mobility of Materials and Mixtures Used in Making Concrete: Thesis

Experiment Station of the University of 11 018 during the spring and summer of 1919, for the purpose of subjecting the properties of concrete to close investigation and analysis. The making of the test cylinders was carried out in the concrete laboratory of the Department of Theoretical and Applied Mechanics under the supervi sion of Professor A. N. Talbot, Head of the Department and H. F. Gonnerman, Research Assistant Professor in the Experiment tatvl oh. In making the tests one of the factors which it was found necessary to keep constant was that condition assumed by concrete materials when freshly mixed together, commonly known as consistency. A measure of this cerdi tion known as the slump was determined for all of the concrete mixtures that responded to test. A vertical slump or shortening of ih. To in. In the length of a 6 by 12 ih. Cylinder of fresh concrete, upon removal of the mold by a steady upward pull was used as a measure of the standard or no mal consistency. Th qe concrete mater1als were mixed in the propor tion of one part cement to five parts of aggregate by volume., Dur ing the molding of the specimen, the concrete was rodded With a ih. Bar having a blunt pointed end and the mold was lightly tapped With a wooden maul.

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