[Closed] concrete mixes - how does post-crete differ?

Postcrete (B&Q) has an accellerent(?) in it, although last time i used it it was disappointing didn't set quickly at all. I've now started to use Hansons version from Travis Perkins better product more aggregate in it as well.

bag of normal ready mixed concrete

Not sure what you mean here mate... you mean Cement Sand and stone?

We use post mix a great deal on site. It sets pretty quick, easy to batch up and achieves a good strength.

Waterery environments actually improve the curing of concrete... it helps dissipate the heat from the chemical reaction of the cement going off.

Lowey - just wondering which ones from B&Q is best as they do Lafarge multi purpose ready mixed concrete and a Lafarge postcrete.

Its for a quick and dirty fix for some posts in a waterlogged hole (i dont have a pump to get all the water out, and it keeps partially filling up with groundwater from the base)

I suspect there'll be too much water in the hole for the ideal mix so was wondering which of the two works slightly better if theres more water than ideal.

I think the postcrete sounds best as goes off quicker, just wondered if there were any differences apart from the acccelerant that make this or the normal stuff any stronger.

The rapid set versions do go off quicker as there is more cement in the mix, which will ultimatly lead to higher terminal strength. Are you standing post up in it or is it already upright ? If your standing one up then get the rapid set. Dont worry about the water... Maybe mix the stuff with a bit less water than recommended as it will absorb some when you pour it in. Otherwise jobs a good un.

Waterery environments actually improve the curing of concrete... it helps dissipate the heat from the chemical reaction of the cement going off.

Depends on the scale of the project... ie in a fence post hole the temps will make **** all difference, even in a mass pour for deep trench filled footings.

Dams and other large scale concrete structures do suffer from thermal gradients tho.

During normal concrete construction,
the heat is dissipated into the
soil or the air and resulting temperature
changes within the structure are
not significant. However, in some
situations, particularly in massive
structures, such as dams, mat foundations,
or any element more than
about a meter or yard thick, the heat
can not be readily released. The
mass concrete may then attain high
internal temperatures, especially
during hot weather construction, or
if high cement contents are used.

[url= http://www.cement.org/tech/pdfs/pl972.pdf ]http://www.cement.org/tech/pdfs/pl972.pdf[/url]