WWilts Posted September 26, 2023 Share Posted September 26, 2023 Steel gate posts 120mm square. Need to be buried 700mm in ground. Concreted in. What concrete to specify (ready mix)? Would 40N be inappropriate? Link to comment Share on other sites More sharing options...
JohnMo Posted September 26, 2023 Share Posted September 26, 2023 Postcrete? 1 Link to comment Share on other sites More sharing options...
saveasteading Posted September 26, 2023 Share Posted September 26, 2023 20 minutes ago, WWilts said: Would 40N be inappropriate? you don't need anything special, so forget 40N. neither do you need readymix unless there are several m3. yes to postcrete, or any diy mix. 1 Link to comment Share on other sites More sharing options...
Conor Posted September 26, 2023 Share Posted September 26, 2023 Basic 1:2:3 mix would do the job (roughly 20n.) It's probably only a couple mixers worth. 1 Link to comment Share on other sites More sharing options...
Onoff Posted September 26, 2023 Share Posted September 26, 2023 5:1 here with integral waterproofer added around 100mm steel posts. 1 Link to comment Share on other sites More sharing options...
TonyT Posted September 26, 2023 Share Posted September 26, 2023 With pieces of metal welded to the parts of the post that will be in concrete to give extra strength. 1 Link to comment Share on other sites More sharing options...
saveasteading Posted September 26, 2023 Share Posted September 26, 2023 16 minutes ago, TonyT said: pieces of metal welded to the parts of the post that will be in concrete Tangs. Link to comment Share on other sites More sharing options...
TonyT Posted September 27, 2023 Share Posted September 27, 2023 Your welcome 1 1 Link to comment Share on other sites More sharing options...
WWilts Posted September 27, 2023 Author Share Posted September 27, 2023 (edited) 15 hours ago, saveasteading said: you don't need anything special, so forget 40N. neither do you need readymix unless there are several m3. yes to postcrete, or any diy mix. Each steel post will have to withstand the weight of a >50kg heavy driveway gate leaf, 1640mm wide and tongue&groove construction (sail effect in gales). That's why considered strong concrete approx 450 x 500mm & depth 700mm. With additional resistance to deflection of post using buried 500mm rebar rods in tripod configuration, to act as buttresses. (plan view attached) Would something other than 40N concrete do the job better? (approx 0.7 cum concrete for 2 driveway gateposts). And is dpm lining of the hole advisable to reduce rapid drying and shrinkage of the concrete? Edited September 27, 2023 by WWilts Link to comment Share on other sites More sharing options...
Mr Punter Posted September 27, 2023 Share Posted September 27, 2023 Forget the readymix, just a couple of tonne bags of ballast and 12 cement needed. How is the rebar fixed to the posts? Make sure it is 32 or 40mm. Ducting between posts for automation. Be good if the posts were galv. 1 Link to comment Share on other sites More sharing options...
WWilts Posted September 27, 2023 Author Share Posted September 27, 2023 (edited) Tks to all. Done the deed in half hour, with 40N readymix after all. Labourer could go on to other tasks, which helps claw back some of the readymix cost. Thin rebar buried without fixing to posts, just to reduce the risk of concrete buttresses cracking. Yes, ducting embedded in concrete to facilitate automation later. Ditched the dpm idea as being further overkill. Will report following gale. Edited September 27, 2023 by WWilts Link to comment Share on other sites More sharing options...
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