I understand your concerns but I’ll stick with the decision of the commander in chief. You know The billionaire real estate developer. With decades of construction experience. Who made his decision after consulting with the military, the border patrol, the Dept. of homeland security as well as other engineers and construction experts.
PS what do they put in concrete to make it stronger and not break?
Steel.
https://www.popularmechanics.com/technology/a20088202/concrete-rebar-practical-engineering
Trump is brilliant and I’ll trust him, too. However, he’s not omniscient or perfect.
On the Oroville Dam rebuild, when they wanted the steel rebar to be long lasting, they had to coat it in . . . plastic.