Post Mix out of date

[Tryhard]

Long delayed Planning consent means that my 10 bags of 25kg have sat in my garage for nearly two years. At last ready to erect the posts - but will the mix still be any good? Clearly the gravel and sand are fine but will the cement have lost its effectiveness? Presumably I could add and mix fresh dry cement in each bag to ensure that it works, but no idea how much.

[thedoctor]

If they are bone dry they may be ok but its very unlikely that they ahve sat for 2 years and not soaked up some moisture. We would not chance it in post holes as, if its no good it could be much more expensive to put it right.

[Tryhard]

Is adding fresh cement to the bags a valid idea? Otherwise I have an awful lot of material to dispose of, apart from additional possibly aviodable expense.

[thedoctor]

Its ok as long as you use the prescribed amount od fresh cement, the old cement then just becomes aggregate.

[Tryhard]

Thanks Doc; only time will tell I suppose, but fresh cement added and posts erected. Looks ok so far.