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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 112 Abstracts search results

Document: 

SP100-52

Date: 

April 1, 1987

Author(s):

Lauri Kivekas and Markku Leivo

Publication:

Symposium Papers

Volume:

100

Abstract:

Concrete is a suitable material for arctic offshore oil and gas drilling and for production platforms. In the splash and tidal zone of these structures concrete is subjected to severe frost-salt attack, chemical attack of sea water, and ice abrasion. In the test series, a method for accelerated testing of arctic freeze-thaw durability in sea water was developed. High-strength air-entrained superplasticized concretes made with blended cement were tested. The test was found to be very severe.

DOI:

10.14359/3728

Document: 

SP100-53

Date: 

April 1, 1987

Author(s):

D. Bjegovic, D. Mikulic, and V. Ukraincik

Publication:

Symposium Papers

Volume:

100

Abstract:

Theoretical aspects of concrete resistance to freezing and deicing chemicals are shown in causal terms. Different constituents and concreting procedures result in different concretes. Furthermore, environmental influences cause a series of physical processes that are also presented in the paper. These physical mechanisms cause stresses that may result in concrete damages. The second part of the paper contains a survey of methods for testing the resistance of concrete to freezing and deicing chemicals. The most common methods are presented in a flowchart showing the advantages and disadvantages of a method and its applicability for a particular structure.

DOI:

10.14359/3738

Document: 

SP100-57

Date: 

April 1, 1987

Author(s):

Ernest K. Schrader and Richard A. Kaden

Publication:

Symposium Papers

Volume:

100

Abstract:

The normally high cement factors, low water-cement ratio, and good compaction of shotcrete typically produce strong, dense, and well-bonded materials when properly applied by either the wet- or dry-mix process. However, the dry-mix process is incapable of reliably, predictably, and routinely providing an adequately air-entrained hardened material that will withstand freeze-thaw cycles under conditions of saturation. Wet-mix process also has had its problems associated with conveying/pumping. Latex modifiers can be added to shotcrete that will produce a freeze-thaw durable material. The modifiers should not be used directly as a bonding agent. Very good bond can be achieved between shotcrete layers and to a concrete substrate by unmodified shotcrete placed against a surface that is near or somewhat below a saturated surface dry condition. Durability is directly related to permeability of shotcretes.

DOI:

10.14359/3744

Document: 

SP100-33

Date: 

April 1, 1987

Author(s):

M. E. Roberts-Seymour

Publication:

Symposium Papers

Volume:

100

Abstract:

Presents three experimental programs employing high-range water-reducing admixtures to modify durability performance in portland cement-fume concrete. Resistivity and chloride permeability are shown to be significantly improved where fume-replaced concrete uses superplasticizers. Superplasticizing has some demonstrated drawbacks where fume is introduced to reduce alkali aggregate reactions.

DOI:

10.14359/1893

Document: 

SP100

Date: 

April 1, 1987

Author(s):

Editor: John M. Scanlon

Publication:

Symposium Papers

Volume:

100

Abstract:

SP100 "Concrete Durability" has been designed to examine the effects of various concreting materials and construction techniques on the ability of hydraulic cement concretes to remain durable under various aggressive exposure conditions found in today’s environment. "Concrete Durability," a symposium volume comprised of 111 papers from around the world, examines the present state of knowledge, identifies and discusses problems and known solutions, and determines what improvements in practice are needed and how they may be achieved. Published in two volumes, and divided by subject matter (sulfate attack, alkali-aggregate reaction, abrasion, corrosion, and others) topics covered include: durability of high-strength concrete, why we have concrete durability problems, concrete durability in bridges, evaluation of the effectiveness of curing concrete structures, frost susceptibility of high-strength concrete, fly ash, and concrete durability, deterioration of aggregates -- the underlying causes and much more.

DOI:

10.14359/14217

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