Creep and Drying Shrinkage of Lightweight and Normal-weight Concretes [by] T.W. Reichard PDF Download
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Author: United States. National Bureau of Standards
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 30
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![Creep and Drying Shrinkage of Lightweight and Normal-weight Concretes [by] T.W. Reichard PDF](https://books.google.com/books/content/images/frontcover/7irZtgAACAAJ?fife=w80-h100)
Author: United States. National Bureau of Standards
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 30
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Author: Thomas W. Reichard
Publisher:
ISBN:
Category :
Languages : en
Pages : 30
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Author: Thomas W. Reichard
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 52
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Book Description
A description is given of a series of tests and test results from an investigation of the mechanical properties of structural-grade lightweight and normal-weight concretes. The major part of the work was planned to obtain comparative values of compressive creep, drying shrinkage, strengths, and moduli of elasticity for concretes made with 24 lightweight and 5 natural, normal-weight aggregates and having the same nominal strength at the time the specimens were placed under load. Data are presented from a total of 76 different concretes which show that there is a wide range in values of the mechanical properties of concretes of the same nominal compressive strength. It is shown that relatively high values of creep and drying shrinkage are not always associated with lightweight concretes and that, in fact, some lightweight concretes have practically the same mechanical properties as some normal-weight concretes. In addition to environmental conditions, the two major factors affecting the creep of concrete appear to be the ratio of the applied stress to the strength at the time of loading, and the aggregate used. Curing conditions, type of cement, mix proportions, and several other variables appear to affect the creep chiefly insofar as they affect the stress-strength ratio. It was observed that the creep at the age of two years can be estimated from the 90-day results with reasonable accuracy. (Author).
Author: T.W. Reichard
Publisher:
ISBN:
Category :
Languages : en
Pages : 30
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Author: Tada-aki Tanabe
Publisher: CRC Press
ISBN: 0203882954
Category : Technology & Engineering
Languages : en
Pages : 1552
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Book Description
CREEP, SHRINKAGE AND DURABILITY MECHANICS OF CONCRETE AND CONCRETE STRUCTURES contains the keynote lectures, technical reports and contributed papers presented at the Eighth International Conference on Creep, Shrinkage and Durability of Concrete and Concrete Structures (CONCREEP8, Ise-shima, Japan, 30 September - 2 October 2008). The topics covered
Author:
Publisher:
ISBN:
Category : Physics
Languages : en
Pages : 40
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Author: Perry H. Petersen
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 24
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Book Description
The loss of prestress resulting from creep and shrinkage in concrete was investigated for concrete specime * ns made with Type I portland cement and with Type III portland cement.Forty-nine sets of specimens were fabricated and tested; each set consisted of a prestressed specimen and an otherwise identical companion specimen without reinforcement. The length changes with time were observed at intervals up to an age of 500 days.These observations were made for concretes subjected to different levels of prestress, and for concretes prestressed at different ages.Length changes in nonreinforced companion specimens were also obtained. Thus this study is concerned with elastic deformation occurring at time of stress transfer, shrinkage or swelling, and creep.(Author).
Author: Lewis E. Vogler
Publisher:
ISBN:
Category : Antennas (Electronics).
Languages : en
Pages : 368
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Graphs of the change in input impedance of electrically short dipole antennas in the presence of an isotropic and homogeneous ground are presented, considering four types of antennas: horizontal and vertical, electric and magnetic dipoles.Curves of the change in both the input resistance and reactance are shown for a wide range of values of the frequency, antenna height above the ground, and electromagnetic ground constants.(Author).
Author:
Publisher:
ISBN:
Category : Engineering
Languages : en
Pages : 354
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Author: United States. National Bureau of Standards
Publisher:
ISBN:
Category : Engineering
Languages : en
Pages : 744
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