MikeSharp01 Posted June 11, 2018 Share Posted June 11, 2018 (edited) I have spent the best part of the last two weeks putting down the type 1 for our slab, 150mm thickness in three layers, 59T in total over 127m2. It's done now but just walking on it you get a good impression of how solid it is. It set me wondering. I weight about 100kg, I am 6'4", my site boots have a ground area of 0.0225m2. Our building will weigh in at around 70T so across the whole slab that's about 583kg/m2 while I put much more that down on the area of my foot, about 4000kg/m2. This slab is not going to move anywhere. Is that overkill or what. Edited June 11, 2018 by MikeSharp01 1 Link to comment Share on other sites More sharing options...
Dreadnaught Posted June 11, 2018 Share Posted June 11, 2018 That's a fascinating insight! Shows the margins for error that a structural engineer must by necessity allow. Link to comment Share on other sites More sharing options...
Temp Posted June 11, 2018 Share Posted June 11, 2018 If you are planning on some nice wood flooring remember to do a similar calculation when the mother in law turns up to the house warming party in stiletto heels :-) Link to comment Share on other sites More sharing options...
Jeremy Harris Posted June 11, 2018 Share Posted June 11, 2018 As a general rule of thumb, a soil max allowable bearing load of about 100 kN/m² is what's been accepted as being OK for standard trench fill foundations for a brick or block house. A passive slab has the massive advantage that it can support a massive load with underlying ground that's around that bearing load figure. IIRC, I worked out that our house was imposing a load on the ground beneath of around 5 kN/m². Link to comment Share on other sites More sharing options...
MikeSharp01 Posted June 11, 2018 Author Share Posted June 11, 2018 4 hours ago, JSHarris said: IIRC, I worked out that our house was imposing a load on the ground beneath of around 5 kN/m². That's about my 583Kg (5.7Kn) / m2, I do seem to recall you saying that passive slabs were overkill. Link to comment Share on other sites More sharing options...
Ferdinand Posted June 11, 2018 Share Posted June 11, 2018 6 minutes ago, MikeSharp01 said: That's about my 583Kg (5.7Kn) / m2, I do seem to recall you saying that passive slabs were overkill. Apropos of not very much, that is very nearly the ground pressure exerted by a medium sized elephant. http://www.physicscentral.com/experiment/askaphysicist/physics-answer.cfm?uid=20090910093223 Link to comment Share on other sites More sharing options...
Tennentslager Posted June 11, 2018 Share Posted June 11, 2018 Yeah but... How do you get an elephant in a fridge? Link to comment Share on other sites More sharing options...
MikeSharp01 Posted June 11, 2018 Author Share Posted June 11, 2018 14 minutes ago, Tennentslager said: How do you get an elephant in a fridge? Come on now don't leave is in suspense and don't try the the three steps trick on us, this needs to be good. Link to comment Share on other sites More sharing options...
Tennentslager Posted June 11, 2018 Share Posted June 11, 2018 Easy, take out two giraffes to make room? 1 Link to comment Share on other sites More sharing options...
MikeSharp01 Posted June 11, 2018 Author Share Posted June 11, 2018 Sigh. Link to comment Share on other sites More sharing options...
Hecateh Posted June 11, 2018 Share Posted June 11, 2018 20 minutes ago, Tennentslager said: Easy, take out two giraffes to make room? almost as bad as the 'Mummy Mummy' jokes Link to comment Share on other sites More sharing options...
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