International Concrete Abstracts Portal

Showing 1-5 of 20 Abstracts search results

Document: 

SP81

Date: 

November 1, 1984

Author(s):

Editor: George C. Hoff

Publication:

Symposium Papers

Volume:

81

Abstract:

SP81 The nineteen papers in this volume are divided into three parts. Part I deals with structural application and design and previous information on the use of fiber reinforced concrete in structural elements. Part II deals with applications, materials, and techniques for evaluating fiber reinforced concrete. Part III consists of committee reports on: A) state-of-the-art report on fiber reinforced concrete; B) measurement of properties of fiber reinforced concrete; C) guide for specifying, mixing, placing, and finishing steel fiber reinforced concrete.

DOI:

10.14359/14038


Document: 

SP81-09

Date: 

November 1, 1984

Author(s):

Ernest K. Schrader

Publication:

Symposium Papers

Volume:

81

Abstract:

A method for adapting existing pavement thickness design curves and formulas for "special" concretes is presented. The need for doing this is discussed; i.e., special concretes made, for example, with fiber reinforcement or high-range water reducers have material properties (specifically changed fatigue endurance and the effects of maturity) which are different from the long-assumed properties that "normal concretes" possess and upon which current design curves are based. Without making these adaptions, wasteful over-design or failures from underdesign can occur. An example is given

DOI:

10.14359/6451


Document: 

SP81-10

Date: 

November 1, 1984

Author(s):

J.G. Keer and A. Thorne

Publication:

Symposium Papers

Volume:

81

Abstract:

A polypropylene-reinforced cement composite has been developed which is considered to be an economic alternative to asbestos-cement. A major application of the composite will be as corrugated sheeting for roofing and cladding. Comparative tests on the behaviour of full-size polypropylene reinforced cement corrugated sheet and asbestos-cement sheet under simulated uniformly distributed loads are reported. The results indicate that the new sheeting of similar profile to a typical asbestos-cement sheet profile and tested over the span recommended for the asbestos-cement profile can sustain the loads in International Standards recommendations and remain serviceable. Furthermore, the quasiductile behaviour of the sheeting and consequent excellent impact resistance are considerable advantages over the brittle behaviour of asbestos-cement.

DOI:

10.14359/6452


Document: 

SP81-11

Date: 

November 1, 1984

Author(s):

Taketo Uomoto and Kazusuke Kobayashi

Publication:

Symposium Papers

Volume:

81

Abstract:

Increase of steel fiber reinforced concrete structures requires a simple test method for measuring steel fiber content in concrete. The measurement of steel fiber content is considered important as the fiber content is the most important index for quality control of steel fiber reinforced concrete. The prominent test methods which have been presented so far are washing analysis and X-ray image test. Both of these tests are too troublesome to be applied for field tests. Measurement of fiber content using electro-magnetic method is not only applicable to hardened concrete but also to fresh con-crete. The measurement can be done within a few minutes whether the test is performed in laboratories or on the fields. A special electro-magnetic apparatus is made and the problems encountered are investigated. The problems are such as the effects of distribution and orientation of steel fibers, the effects of the distance from the apparatus to the test specimen, etc.. A practical method to measure steel fiber content is clarified and the measured values showed good agreements with the washing analysis. Application of the apparatus for estimation of rupture sections of beams is also investigated.

DOI:

10.14359/6453


Document: 

SP81-12

Date: 

November 1, 1984

Author(s):

W. Suaris and S.P. Shah

Publication:

Symposium Papers

Volume:

81

Abstract:

It is well accepted that fiber-reinforced concrete exhibits superior impact resistance than does plain concrete and numerous tests have been employed to evaluate its impact resistance. These include explosive tests and impact tests using projectiles and drop weights. Some of these tests and their results are described in this paper. Attempts to obtain more basic material parameters, by conducting instrumented impact tests, are described next and problems associated with the interpretation of their results are discussed. Finally a testing method developed by the authors, which appears to yield basic mechanical properties of fiber-reinforced concrete subjected to impact is presented.

DOI:

10.14359/6454


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