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Author : E. C. Roshore
Publisher :
ISBN 13 :
Total Pages : 60 pages
Book Rating : 4.3/5 (91 download)
Download or read book Durability and Behavior of Prestressed Concrete Beams written by E. C. Roshore and published by . This book was released on 1971 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Edward F. O'Neil
Publisher :
ISBN 13 :
Total Pages : 44 pages
Book Rating : 4.3/5 (91 download)
Download or read book Durability and Behavior of Prestressed Concrete Beams written by Edward F. O'Neil and published by . This book was released on 1976 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Edwin C. Roshore
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (618 download)
Download or read book Durability and Behavior of Prestressed Concrete Beams written by Edwin C. Roshore and published by . This book was released on 1971 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 43 pages
Book Rating : 4.:/5 (227 download)
Download or read book Durability and Behavior of Prestressed Concrete Beams. Report 3. Laboratory Tests of Weathered Pretensioned Beams written by and published by . This book was released on 1971 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt: The work describes laboratory tests which were conducted on four prestressed concrete beams which had been exposed to tidal weathering for a considerable period of time. Two of the beams had been exposed in an unloaded condition at the Treat Island, Maine, severe weathering exposure station and the other two had been exposed for 9 years in a flexurally loaded condition at the St. Augustine, Florida, mild weathering exposure station. The laboratory tests conducted on these beams consisted of the examination and tensile testing of the steel prestressing strands after removal from the beams and tests for depth of carbonation and chloride penetration in the test beams. The steel prestressing strands were found to be corroded externally for 20 to 100 percent of their length. Internal strand corrosion was generally more extensive than the external corrosion; the corrosion seemed to progress along the center wire of each strand. Only 8 of the 25 strand sections tested met the tensile strength and elongation requirements of ASTM Designation: A 416-68. Corrosion on the steel strands at the ends of all beams showed that the epoxy pads used as end protection were not effective in protecting the ends of the strands. Depth of carbonation tests indicated that carbonation was not a factor in the corrosion of the steel strands. Depth of chloride penetration tests revealed that sufficient chlorides were present in the test beams to cause corrosion on the prestressing strands. The steel strands taken from the St. Augustine beams were in poorer condition than those from the Treat Island beams.
Author : Edward F. O'Neil
Publisher :
ISBN 13 :
Total Pages : 37 pages
Book Rating : 4.:/5 (965 download)
Download or read book Durability and Behavior of Prestressed Concrete Beams written by Edward F. O'Neil and published by . This book was released on 1976 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Edward F. O'Neil
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (841 download)
Download or read book Durability and Behavior of Prestressed Concrete Beams written by Edward F. O'Neil and published by . This book was released on 1976 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Edward F. O'Neil
Publisher :
ISBN 13 :
Total Pages : 178 pages
Book Rating : 4.3/5 (91 download)
Download or read book Durability and Behavior of Prestressed Concrete Beams written by Edward F. O'Neil and published by . This book was released on 1977 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : E. C. Roshore
Publisher :
ISBN 13 :
Total Pages : 60 pages
Book Rating : 4.3/5 (91 download)
Download or read book Durability and Behavior of Prestressed Concrete Beams written by E. C. Roshore and published by . This book was released on 1967 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : E. C. Roshore
Publisher :
ISBN 13 :
Total Pages : 44 pages
Book Rating : 4.:/5 (359 download)
Download or read book Durability of Prestressed Concrete Beams written by E. C. Roshore and published by . This book was released on 1964 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: The durability of pretensioned and posttensioned concrete beams is being studied using laboratory-prepared beam specimens. A group of beams containing pretensioned strands, some made with air-entrained concrete and others with nonair-entrained concrete, was exposed to natural weathering. It is concluded: (a) Concrete for prestressed structural elements that are to be exposed to freezing and thawing in a moist condition should contain entrained air. (b) The concrete cover over reinforcing should be greater than 3/4 in. when exposure to seawater is involved. (c) Epoxy concrete is superior to portland cement concrete for end protection. Flush anchorages appear to be more effectively protected than external anchorages. (Author).
Author : E. C. Roshore
Publisher :
ISBN 13 :
Total Pages : 58 pages
Book Rating : 4.:/5 (227 download)
Download or read book Durability and Behavior of Prestressed Concrete Beams. Pretensioned Concrete Investigation, Progress to July 1960 written by E. C. Roshore and published by . This book was released on 1961 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: The investigation comprised the fabrication and testing of 28 large, prestressed concrete beams and 412 small auxiliary specimens of the same concrete to obtain information on the factors affecting durability of prestressed concrete beams. Some of the beams contained air-entrained concrete; some did not. Most of the beams were pretensioned with high-strength steel strands, but four (fabricated for control purposes) were not. The beams were subjected to laboratory tests, and to natural weathering at exposure stations in Maine and Florida, in both loaded and unloaded conditions. The auxiliary specimens were tested to obtain information on the strength, elastic, and plastic properties of the concrete. Tests were also made to determine the creep, tensile strength, relaxation, and dynamic modulus of elasticity of the pretensioning steel strands. (Author).
Author : Edwin C. Roshore
Publisher :
ISBN 13 :
Total Pages : 53 pages
Book Rating : 4.:/5 (618 download)
Download or read book Durability and Behavior of Prestressed Concrete Beams :report 1 - Pretensioned Concrete Investigation, Progress to July 1960 written by Edwin C. Roshore and published by . This book was released on 1961 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Edward F. O'Neil
Publisher :
ISBN 13 :
Total Pages : 44 pages
Book Rating : 4.3/5 (91 download)
Download or read book Durability and Behavior of Prestressed Concrete Beams written by Edward F. O'Neil and published by . This book was released on 1984 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Waterways Experiment Station (U.S.)
Publisher :
ISBN 13 :
Total Pages : 70 pages
Book Rating : 4.X/5 (1 download)
Download or read book Durability and Behavior of Prestressed Concrete Beams written by Waterways Experiment Station (U.S.) and published by . This book was released on 1961 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Waterways Experiment Station (U.S.)
Publisher :
ISBN 13 :
Total Pages : 31 pages
Book Rating : 4.:/5 (132 download)
Download or read book Durability and Behavior of Prestressed Concrete Beams written by Waterways Experiment Station (U.S.) and published by . This book was released on 1961 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Waterways Experiment Station (U.S.)
Publisher :
ISBN 13 :
Total Pages : 114 pages
Book Rating : 4.:/5 (359 download)
Download or read book Durability and Behavior of Pretensioned-prestressed Concrete Beams written by Waterways Experiment Station (U.S.) and published by . This book was released on 1963 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Waterways Experiment Station (U.S.)
Publisher :
ISBN 13 :
Total Pages : 174 pages
Book Rating : 4.3/5 (91 download)
Download or read book Technical Memodrandum written by Waterways Experiment Station (U.S.) and published by . This book was released on 1971 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Edward F. O'Neil
Publisher :
ISBN 13 :
Total Pages : 177 pages
Book Rating : 4.:/5 (227 download)
Download or read book Durability and Behavior of Prestressed Concrete Beams. Report 4. Posttensioned Concrete Beam Investigation with Laboratory Tests from June 1961 to September 1975 written by Edward F. O'Neil and published by . This book was released on 1977 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report is the fourth in a series describing a study which is being conducted to develop information on the durability of prestressed concrete beams. Twenty posttensioned concrete beams were cast and installed at the Treat Island exposure station. The beams were cast around four different types of posttensioning systems, with the posttensioning reinforcement cast at four different eccentricities. Twelve different types of end anchorage protection were cast over external and flush anchorages. The end anchorage protection was attached to the beam with four different types of joint preparation. The beams were subjected to tidal inundations (wetting and drying) two times each day and also to an average of 131 cycles of freezing and thawing per winter for a test period of 12 to 13 winters. During the fall of 1973, five beams were returned to the U.S. Army Engineer Waterways Experiment Station for autopsy and testing. The testing included: (a) structural testing, visual evaluation of the condition, and dissection of the concrete beams; (b) visual evaluation of the end anchorages and the posttensioning conduit; (c) autopsy of the posttensioning system; (d) structural testing of the posttensioning strands; (e) analysis of the products of corrosion on the steel strands; and (f) analysis of the concrete and grout of the beams.
