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raised bed garden "curb"? Answered

I want to make lengths of "curb" to make a raised bed garden in modular lengths. It would be subjected to freezing temperatures and moisture over winter. Would this be a good material to use? Would the additive that created tiny bubbles be required? ...and sufficient? I was thinking 2" x 8" x 4 feet with a "U" shaped rebar reinforcement, sticking out to make "legs" to stab into the ground. Could I accomplish this? How could I improve this idea?