Concrete wheel stops are typically pinned into the paving using 18" long 3/4" diameter rebar.
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cover it
To stop radiation leaking out. Alpha and Beta types of radiation will be stopped by the concrete
You can add citric acid and sugar to stop hydration. But then the concrete is unusable and you need to throw it away.
Try UGL Dry-lok.
Install a water hammer arrestor (air chamber)