Please address the corrosive nature of hydroscopic concrete in direct contact with steel.
Even Core 10 isn’t impervious.
“Please address the corrosive nature of hydroscopic concrete in direct contact with steel. Even Core 10 isn’t impervious.”
CORTEN steel is not impervious, but it is the best option - much better than the relatively poor choice of steel in the landing mat barriers, that lasted 30 years close to the marine environment in San Diego. The bollard steel is much heavier gauge as well - designed to stop speeding trucks.
The concrete encased inside the steel bollards has extremely limited ability to absorb new moisture, greatly limiting the effect.
Obviously, this bollard design will be significantly more durable to corrosion than the previous designs, like landing mat - even more so in arid desert.
Considering that they have had billions of dollars and decades to work on this problem, the likelihood that professional engineers have addressed corrosion considerations, is inescapable. It has been in the functional requirements and contract specs for border bollards for decades now. They have been proven in practice.
Don’t let references to “an estimated 20 year lifecycle” mislead you that this refers to the characteristics of the barrier. 20 years is just the standard of comparison for lifecycle costs on most Government projects. Just as costs for things in the budget that are intended to continue in perpetuity are evaluated over the the period of the ten year baseline budget, it is only a snapshot estimate for accounting purposes.
The see through capability enabled with bollard design is considered vital for effective operations - to detect, identify and deter.