Recipe Needed

[Deleted member 478]

A local here in Itaparica wants to put down a couple of concrete blocks for moorings in front of his restaurant. Does he need to use a special mix of cement/sand/stone/other in a marine inviroment?

TIA

 

[snowleopard]

No reason why 1:2:4 shouldn't do the job perfectly well. Concrete likes to be kept wet.

 

[sarabande]

if the Romans managed it, then...
http://nabataea.net/cement.html

You need an additive such as Wickes cement waterprrofer
http://www.wickes.co.uk/pcat/12cement

These pages give the background and emphasise the need to get as much air out of the mix as poss.

Most important is making sure that the blocks have chance to cure properly before being immersed. At least 10 days on land, covered in hessian with an occasional bucket of water chucked over them. We used to leave a freshwater spray over the blocks used for harbour walls in Dubai to keep them cool whilst they hardened off.

 

[Ariadne]

Get them to hire a vibrating poker, which will get all the air out. Keep it damp for a week or so untill cured then chuck in the tide.

Bit like woman really!!!!!!!!!!!

 

[SAWDOC]

Do you intend using mesh reinforcement ? If so try to position it 50mm from all exposed edges including base.

 

[KREW2]

Bake him some of your bread with onions in, that'll sink well.