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International Concrete Abstracts Portal

The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

Showing 1-5 of 33 Abstracts search results

Document: 

SP109-29

Date: 

August 1, 1988

Author(s):

T. W. R. Taylor and H. R. Woodhead

Publication:

Symposium Papers

Volume:

109

Abstract:

The Port of Vancouver, Canada, is the owner of one of the world's newest and most unique heliports. This state-of-the-art floating facility is constructed from styrofoam-filled cellular concrete. The analysis and design of the structure is developed in this paper. Some of the interesting aspects of construction are highlighted and the economic benefits of this use of reinforced concrete are discussed.

DOI:

10.14359/3054

Document: 

SP109-20

Date: 

August 1, 1988

Author(s):

P. F. Adams, T. J. E. Zimmerman, and J. G. MacGregor

Publication:

Symposium Papers

Volume:

109

Abstract:

The exterior walls of arctic oil and gas production structures will be subject to large, concentrated ice forces. Composite steel/concrete walls have been proposed as a cost-effective solution to resisting these forces. The research discussed in this paper has investigated the behavior and failure mechanisms of composite walls, so that recommendations can be made concerning analysis and design methods and effective construction details. The research involved the development of design-oriented ultimate strength models, as well as the physical testing of composite wall specimens. Results are presented in this paper for tests on composite beam and composite slab specimens. The high strength and great ductility of this form of construction is demonstrated. Effective design methods utilizing empirical design equations and limit analysis plasticity solutions are given.

DOI:

10.14359/3075

Document: 

SP109-30

Date: 

August 1, 1988

Author(s):

T. A. Holm, T. W. Bremner, and A. Vaysburd

Publication:

Symposium Papers

Volume:

109

Abstract:

Concrete ships and bridges incorporating structural lightweight concrete were examined for durability with particular attention given to depth of carbonation. The profile of the carbonation front was determined for these mature structures in or over sea water, and the carbonation front was found not to approach the steel reinforcing even after several decades of exposure. Factors affecting the rate of carbonation are discussed and recommendations are given to limit the extent of carbonation.

DOI:

10.14359/2114

Document: 

SP109-17

Date: 

August 1, 1988

Author(s):

K. Takewaka and S. Mastumoto

Publication:

Symposium Papers

Volume:

109

Abstract:

For selecting concrete cover for reinforcement in marine structures, consideration of the corrosion protection of steel bars is indispensable. Therefore, requirements for quality and thickness of concrete cover must be established so the concrete cover prevents chlorides, oxygen, water, etc., from reaching reinforcement through the life of the structure. To insure good performance of concrete cover, the chloride penetration process should be understood. A dualistic diffusion equation was adopted to explain this. In solving equations, the following were clarified through referral to data of experiments: 1) The relationship between the quality of concrete and chloride diffusion coefficients; 2) the effect of the chemical or physical adsorption of chloride in concrete on the diffusion process; and 3) boundary condition to concrete surface for chloride concentration in various marine environments. On the basis of these studies, a close agreement between observed and calculated values was obtained. Through the calculations of chloride penetration, the rational design for quality and thickness of concrete in various marine environments has been suggested.

DOI:

10.14359/2124

Document: 

SP109-18

Date: 

August 1, 1988

Author(s):

A. M. Nawwar and V. M. Malhotra

Publication:

Symposium Papers

Volume:

109

Abstract:

Paper describes the development of a test method to determine the ice abrasion and/or impact resistance of concrete. Briefly, the method consists of testing specially fabricated 300 mm diameter x 500 mm length cylindrical concrete specimens against ice abrasion and/or impact. The ice abrasion and impact pressure on rotating concrete cylinders are produced using an ice block, located above the concrete samples, the vertical travel of the ice being controlled by a hydraulic ram. The measurements taken during the test include the determination of the surface profile of the concrete specimens, the output from strain gages mounted on the reinforcing rods in the specimens, and the impact speed and acceleration of the ice block. Preliminary tests indicate that the apparatus developed offers a promising mechanism for studying the resistance of concrete to ice abrasion and/or impact. The limited available data show that the surface finish of a test specimen greatly affects the initial abrasion resistance of concrete.

DOI:

10.14359/3585

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