Yes you'll be able to bust it up

My suggestion get a 20 year old to do it for you or use an electric
jack hammer.

If you use the sledge, distribute the blows evenly, hitting it about
every 6 inches or so; repeatedly. (will you be able to keep up the
sledge hammering for MANY minutes without tiring?)

Continuing this process, you will eventually break the thing up into
manageable pieces rather than rubble.

Concentrating the blow will locally fragment & destroy the concrete
while leaving the remainder intact.

I feel tired jsut thinking ou the last time I did this.

cheers
Bob