Investigation Of Creep In Concrete Report 4 Effect Of Specimen Size And Wet Sieving To Remove Aggregate Larger Than 1 1 2 In

Author : Ernest E. McCoy
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (227 download)

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Download or read book Investigation of Creep in Concrete written by Ernest E. McCoy and published by . This book was released on 1967 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Creep measured on 6- by 16-in. concrete cylinders made and tested in 1957 was compared with that measured on 30- by 60-in. cylinders made and tested in 1954 for two concrete mixtures. In one series of tests both sizes of specimens were made from the same mixture proportions; the maximum size of aggregate for this mixture was 1-1/2 in. In the other series of tests the 30- by 60-in. cylinder was made from concrete containing 6-in. maximum size aggregate, whereas the 6- by 16-in. cylinders were made from identical concrete wet-sieved to remove all aggregate larger than 1-1/2 in. The creep of the small specimens was corrected for autogenous length change. Since there were no control specimens of 30- by 60-in. size, the creep of specimens of that size was not corrected for autogenous length change. Test results generally confirm theories regarding creep, and show that, if practicable, testing should be done on large specimens containing the full concrete mixture. At very early loading ages, the creep of large specimens was greater than that of small specimens. At later ages, the reverse was true.