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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: 

SP109-04

Date: 

August 1, 1988

Author(s):

B. Espelid and N. Nilsen

Publication:

Symposium Papers

Volume:

109

Abstract:

Experience and research have shown that reinforcement in submerged concrete appears to be well protected against corrosion. Questions have been raised as to whether this durability will be present in structures subject to dynamic loads and in structures spanning through several environment zones. To clarify the effect of loading, eight concrete beams were exposed dynamically loaded at a seawater laboratory. Four of the specimens were allowed to corrode freely, while the rest were cathodically protected. To study the corrosion behavior of multizone exposed concrete structures, eight concrete columns with a diameter of 0.6 m and a height of 5 m were installed in the sea. One of the main objectives was to study the cathodic current density demands of embedded steel exposed to different environmental zones and of multizone exposed embedded steel. This paper presents the results from the laboratory and field tests, and the main conclusion is that the corrosion conditions found on a multizone exposed concrete structure differ from those found on a completely submerged structure.

DOI:

10.14359/1927

Document: 

SP109-16

Date: 

August 1, 1988

Author(s):

J. L. Trinh and L. Lemoine

Publication:

Symposium Papers

Volume:

109

Abstract:

A project was devoted to the experimental examination of durability of reinforced concrete beams cast with either normal gravel or artificial lightweight ARGI 16 aggregates. Two series of three identical beams, different only by the nature of concrete, were exposed in the following conditions. One couple comprising a beam of each type is left in conditions simulating the normal tidal zone; the remaining beams are stored in a similar exposure combined with a thermal treatment during the immersion position (ventilation with air heated at 32 C). All tested elements were subjected to a bending moment by means of a negative prestressing, letting a permanent cracking of tensioned concrete. The examination period lasts five years. The paper deals with observations done during this period and results gained in the final loading tests achieved. The conclusion drawn from this particular study is very promising for durability of normal or lightweight concrete structures in marine environment, at least with the normally required quality.

DOI:

10.14359/2011

Document: 

SP109-21

Date: 

August 1, 1988

Author(s):

S. Nishibayashi, S. Hideshima, S. Negami, and M. Takada

Publication:

Symposium Papers

Volume:

109

Abstract:

Effect of chemical and mineral admixtures on the durability of concrete in an undersea environment has been studied. Addition of slag and slag-like materials and water-reducing agent improves the durability of concrete. However, alkali-silica aggregate reaction aggravated by the marine environment and the corrosion of reinforcing steel bars are enhanced. By the addition of rust inhibitors, these effects can be controlled.

DOI:

10.14359/2025

Document: 

SP109-25

Date: 

August 1, 1988

Author(s):

H. Roper, J. L. Heiman, and D. Baweja

Publication:

Symposium Papers

Volume:

109

Abstract:

In Australia, the major population centers are located on the coast. A significant proportion of the nation's heavy industrial infrastructure and civil engineering work is also coastal. A wide variety of structures have been constructed in aggressive marine environments. Many of these structures have had long histories of durability problems and subsequent repair. Paper reports on field and laboratory studies that have been carried out to evaluate the performance of two wharf structures and their repair systems. It discusses the usefulness of various methods of detecting corrosion activity and considers the effects of chloride contamination and carbonation on damaged structures. Some aspects of repair materials for use in the marine environment are considered.

DOI:

10.14359/2755

Document: 

SP109-12

Date: 

August 1, 1988

Author(s):

Y. Takagishi, H. Ichikawa, H. Tabuchi, and A. Moriwake

Publication:

Symposium Papers

Volume:

109

Abstract:

Load-carrying capacity and fatigue strength before and after repairing were investigated for a coastal structure in Tokyo Bay, which was subjected to serious damage by chloride for 15 years. Static and cyclic load tests together with investigation on effectiveness of repair were carried out on specimens taken from the site. It was found that the bearing and yielding capacities of deteriorated slab are 90 and 80 percent, respectively, of those of sound structure. These losses were mainly caused by 10 percent loss of reinforcement corrosion. The specimens repaired by material with high tensile strength suggested brittle failure in static load tests. It was also found that fatigue failure of deteriorated reinforcements was accelerated by pitting corrosion.

DOI:

10.14359/2761

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