May 20May 20 Just a general question for those who have been there and done that. I need to order 30m2 of type 1 or crushed concrete for the ground bearing slab. That equates to 72 ton and type 1 is £33.50/ton Recycled crushed will probably save me half that amount, but I wanted to ask what people's thoughts are on type 1 vs recycled. The ground below is flinty as anything and then it goes to chalk, so I don't think there are any concerns about settlement.
May 20May 20 15 minutes ago, flanagaj said: Just a general question for those who have been there and done that. I need to order 30m2 of type 1 or crushed concrete for the ground bearing slab. That equates to 72 ton and type 1 is £33.50/ton Recycled crushed will probably save me half that amount, but I wanted to ask what people's thoughts are on type 1 vs recycled. The ground below is flinty as anything and then it goes to chalk, so I don't think there are any concerns about settlement. Check with the SE, they will have specified?
May 20May 20 Author 21 minutes ago, Nickfromwales said: Check with the SE, they will have specified? Just checked and their spec just states hardcore (looks like a lifted and shifted spec)
May 20May 20 1 minute ago, flanagaj said: Just checked and their spec just states hardcore (looks like a lifted and shifted spec) In that case you just need to choose for yourself, and ensure any details for layering / compaction are observed. Have this chat BEFORE anyone starts work, not after...............
May 20May 20 Author 9 minutes ago, Nickfromwales said: In that case you just need to choose for yourself, and ensure any details for layering / compaction are observed. Have this chat BEFORE anyone starts work, not after............... I'm going to do this job myself.
May 20May 20 Just now, flanagaj said: I'm going to do this job myself. Use your rage to punch-compact the bastard
May 20May 20 Crushed concrete / brick will be OK but not any old crap with plaster, wood, rubbish mixed in.
May 21May 21 Crushed is fine if clean but there is a middle ground if a supplier will sell it graded a type 1. BUT 30m2 x say 0.2 is 6m3. X 2.4t/m3 is 14.4tonnes. Think of it another way. Does this look big enough for 3 lorry loads, or more like one? Edited May 21May 21 by saveasteading
May 21May 21 I wouldn't use crushed concrete again after our last lot! Full of rubbish really and didn't compact that well. Local groundworker suggested 75mm crush and run and that was much better. Much cleaner and compacted really well. Also pretty cheap at £21 a ton!
May 21May 21 Crushed recycled varies a lot between suppliers, in my experence. Had some really good some awful , get a sample and check first load when delivered Edited May 21May 21 by FarmerN
May 21May 21 Geocell recycled foamed glass agregate. That way you get insulation and hardcore in one product. 250mm depth = building regs slab insulation. Also does not need a membrane unless you are in a radon area as it does not wick moisture Not so cheap though.
May 21May 21 4 hours ago, mjc55 said: 75mm crush and run Excuse me grinning at this. Crush and run sounds like the worst of recycled aggregate. From a quick Google I see,though, that it is a fairly commonly used term, presumably from mishearing and repetition. I just had never heard it said this way. The tech term is crusher run. I have always understood it to mean "as it comes" . Thus it is great for haul roads and heavy duty parking, but not for precision as there isn't a graded mix. 75mm crusher run will be everything that went through a 75mm grille. That would feasibly include long lumps, and will vary according to the original material. So @mjc55 you were lucky or the guy had seen it.
May 21May 21 We had 75mm crusher run for our temporary access (still there 😀). We've had upto 32 ton lorries over it and its stood up well. I would use it for a slab foundation - probably will use it for the garage, with a 50 - 75mm sand layer and DPM before slab is poured Edited May 21May 21 by BotusBuild
May 21May 21 2 hours ago, BotusBuild said: probably will use it for the garage, with a 50 - 75mm sand layer I'd be ok with that. Because there could be voids I agree with 75mm capping but not all sand. Thick sand ruts and gets footprints, and so concrete can dip into it and the slip property is lost. I'd prefer 50 or 60mm of type 1 or 2, then the rest in sand.
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