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Home > Publications > 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.
Title: Several Factors Regarding Sustainability of Marine Concrete Structures
Author(s): T. U. Mohammed, H. Hamada, and
Publication: Special Publication
Appears on pages(s): 23-44
Keywords: blended cement; chemical admixtures; corrosion; joints; steel bars; steel-concrete interface; sustainability; type of bars
Abstract:Several factors regarding sustainability of marine concrete structures are dis- cussed based on detailed laboratory and several long-term exposure tests. The factors include voids at the steel-concrete intarface, crack widths and autogeneous healing, blended cements, chemical admixtures, type of bars, and joints. Long-term exposure investigations were carried out utilizing the specimens exposed to the marine environment over 10 years. The following conclusions are drawn: 1. To enhance long-term durability, the steel-concrete interface should be free from voids; 2. Narrower cracks and joint surfaces are healed in the marine tidal environment with alkaline deposits, and thereby control the corrosion of steel bars at these locations; 3. Blended cement with high slag content shows the best performance for long- term durability compared to the normal ponland cement and other investi- gated blended cements; 4. The napthalene group of chemical admixture shows the best performance for long-term durability compared to other investigated chemical admixtures; 5. Deformed bars are more prone to corrosion compared t oplain bars; 6. Brushing-off the laitance and application of a mortar coat at the joint plane is very effective in enhancing long-term durability.
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