File:The elastic properties of concrete under bi-axial loading (1912) (14594714309).jpg

Identifier: elasticpropertie00mill (find matches)
Title: The elastic properties of concrete under bi-axial loading
Year: 1912 (1910s)
Authors: Millard, Floyd Hays
Subjects: Concrete Theses
Publisher:
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
ns did not shov? that the stone had crushed or split.In one cylinder however the cement did not seer, to adhere v.ellto the stone but rather to the fine crusher dust on its surface. Table III.IIECIIAITICAL AlTALYoIS 0? STOIIS - 1912,Average of 5 Samples, Size ofSquareOpening SeparationSizein. Per CentPassing 1-in.3/4-in.1/2-in.3/8-in.No. 3No. 5No. 10 0.2s 0.174 0.091 10095.566.746.325.98.13.4 4 1^ i Steel. The steel used in the crossed beams consisted of plainround bars o/s in. in diameter. They ^neve of mild open hearthsteel. Tests of two bars cut from lengths used in the beamsindicated a yield point of 37350 lb. per sq.in. and an ultimatestrerigth of 58150 lb. per sq.in. The modulus of elasticity asdetermined from the tests was 31 100 000 ajid 31 400 000 lb. persq.in. in the two cases. The stress-deformation diagrams appearamong the curves in the bade of the thesis. Concrete. This investigation was in progress at the time theEngineering Experiment Station changed from harid-mixed to
Text Appearing After Image:
10 machine-mixed concrete. Consequently both Xindc of 1-2-4concrete veve used in malcln^; test specimens. This is fortunatein that it gives the opportunity to study the phenomena of bothconcretes under practically identical conditions. The hand-mixed concrete was prepared in the same v-ay asthe concrete previously used in experimental worl^ by the lab-oratory. Men slcilled in mixing concrete and in malcing testpieces were employed in the vrork. The foreman and other uorl^nenare experienced concrete vrorlcmen; they have made the specimensfor the laboratory for seven seasons. The mixing;;; was done ;ithshovels. The sand and stone 7/ere first measured by loosevolmne, and then \7eighed to checlv the measurement. A bac ofcement (95 lb. ) ^as considered as one cubic foot of cement.The sand and cement vjere first mixed dry; the stone \7hich hadbeen previously moistened uas added and the mix turned until ofa uniform appearance. Usually the first operation includedfive or six turnings and the

Note About Images