Seawater Concrete Degradation
Seawater Concrete Degradation - Related Videos
03:07
Selective Enrichment and Isolation of Oil-Degrading Marine Bacteria from Seawater Samples
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2025
Source: Villela, H. D. M., et al. Prospecting Microbial Strains for Bioremediation and Probiotics Development for Metaorganism Research and Preservation. J. Vis. Exp. (2019)This video demonstrates the selective isolation of oil-degrading marine bacteria by enriching seawater samples on oil-based media, enabling the recovery of pure strains with potential applications in crude oil bioremediation and environmental cleanup.
08:23
Seawater Sampling and Collection
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Cited by 13 •
2009
This video documents methods for collecting coastal marine water samples and processing them for various downstream applications including biomass concentration, nucleic acid purification, cell abundance, nutrient and trace gas analyses.
11:23
Tests on Fresh Concrete
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2017
Source: Roberto Leon, Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA Concrete consists of two phases, a cement paste phase comprised of cement, water, and air, and an aggregate phase comprised of coarse and fine aggregates. There are two key considerations when designing a concrete mix. First, the concrete must be workable and easy to cast in the forms in its fresh condition, even when the forms are packed with steel reinforcement. In this condition, it is the...
10:09
Tests of Hardened Concrete in Tension
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2023
Source: Roberto Leon, Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA In a previous laboratory focused on concrete in compression, we observed that concrete can withstand very large stresses under uniaxial compressive forces. However, the failures observed were not compressive failures but failures along shear planes where maximum tensile forces occur. Thus, it is important to understand the behavior of concrete in tension and particularly its maximum strength...
05:58
Large Volume (20L+) Filtration of Coastal Seawater Samples
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Cited by 16 •
2009
This video documents large volume (≥20 L) filtration of microbial biomass, ranging between 0.22μm and 2.7μm in diameter, from the water column.
FAQs
Chloride ingress becomes critical when seawater carries chloride ions through concrete’s pore network to embedded steel. The ions can depassivate the steel, removing the protective condition that limits corrosion initiation. As corrosion develops, damage can contribute to loss of reinforcement-related integrity and reduced durability over the structure’s service life.
Sulfate ions attack cement hydration products rather than primarily initiating reinforcement corrosion. These reactions can produce expansion within the concrete, followed by cracking and surface deterioration. The distinction matters in engineering assessments because a structure may experience cement-related damage from sulfate exposure even when chloride-driven corrosion is considered separately.
Repeated wetting and drying can continually expose concrete to seawater and its dissolved ions, while abrasion can wear away vulnerable surfaces. Freeze-thaw conditions add another source of stress. Together, these environmental actions can intensify cracking, surface deterioration, and loss of integrity, making the exposure pattern as important as seawater contact itself.
Engineers can improve durability by selecting concrete mixtures that reduce permeability, limiting the movement of chloride and sulfate ions through pores. Design should also account for protection of embedded reinforcement, because chloride exposure can initiate corrosion. These choices reduce the rate of harmful transport and help extend service life in marine infrastructure.
Maintenance planning should reflect the distinct mechanisms acting in the marine environment, including chloride-related reinforcement corrosion, sulfate-related expansion and cracking, and physical exposure effects. By considering these risks together, engineers can organize measures intended to preserve strength and integrity, respond to deterioration, and support the expected service life of the structure.
The topic is especially relevant to bridges, piers, ports, offshore foundations, and other coastal infrastructure. In these applications, engineers use an understanding of ion transport, reinforcement vulnerability, cracking, abrasion, and environmental cycling to guide durable mixture selection, reinforcement protection, structural design, and long-term maintenance planning.