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After pouring concrete, what material should be used to fill the gap left by the forms?

Asked by LuckyGuy (38897points) September 15th, 2012

I am pouring a 10 ft x 10 ft concrete slab that is grade level with the surrounding grass. I am using well anchored pine 2×4s as the forms. After the slab sets up and the forms are removed, is it better to fill the gap with top soil or should I fill it with something porous like pea gravel. I live in a cold climate that ‘enjoys’ winter ice and snow for several months of the year.
Which is best for the life of the slab?

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