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Salt got on small piece of my concrete and now it is breaking down. i am getting all these pitted holes about the size of a baseball. it actually looks like the concrete is peeling.

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Salt is evil when it omes to unsealed concrete. Hose down the area and remove any remaining salt. Then go to a cement block/brick yard and speak with the clerk about your problem. There are several very excellent concrete patches that will do the repair. Finally, I would seal or reseal the entire concrete pad.

please mark my answer as a fixya!

Posted on Mar 11, 2009

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Lets assume that our concrete bag has a volume of 'x' and is 2/3rd the size of a 1 foot cube.
that means its volume is 2/3 cubic foots.
thus we conclude x = 2/3 CF (cubic foots)

Lets assume the hole has a volume of y and is equal to
63x59x4 CF
thus y = 63x59x4 CF

Divide to get the result

y/x = (63x59x4)/(2/3)

there is a rule in mathematics that makes the above convert into

y/x = (63x59x4x3)/2

yes the lowermost 3 jumps up only because it was coupled with the 2 below the divide sign
see the brackets
only in such special conditions the last digit jumps up.

Now a simple calculator will find our answer

Assume to calculate separately (seems easy to me this way)
63x59x4x3 = 44604

y/x = 44604/2

thus y/x = 22302 units.

That means to fill up a hole of dimensions 63x59x4 CF it will take upto 22,302 concrete bags .

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Convert 30pounds per sq.foot to pounds per cubic foot(concrete=150#/cubic foot at 1in. thick conc. slab).

These are not the same, so cannot be directly converted.

Pounds per sq ft is a measure of pressure, while lbs / cu ft is a measure of density, weight per unit volume.

I think maybe what you are doing here is converting the weight of concrete in a 1" slab, where a sq ft would contain

1 x 1 x 1/12 = .0833 cu ft

The figure of 150 lb/ cu ft is correct for the average density of concrete, so the above slab would have

1/12 x 150 = 12.5 lbs/sq ft at 1" thickness

BTW that is a thin slab of concrete, insufficient even for a light-duty pathway. If you are referring to a screed for tiling or similar, that is cement.

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