Browse Forums General Discussion Re: Exposed Agg specialist 3Feb 14, 2020 4:57 pm Lots - so basically was poured in july and pebbles keep coming loose. Its in both driveway and alfresco which were poured different days. We moved in Aug and it started disintegrating straight away.
They're suggesting its because we didnt seal it. I think mix was bad or maybe due to the acid wash. The concrete seems to be extremely pourus - when the driveway is wet, you can hear air bubbles coming up from underneath. Also, how deep shpuld the cuts in the concrete be? Re: Exposed Agg specialist 5Feb 14, 2020 5:13 pm Hey Thanks for the photos If you take a key and scratch the surface does the concrete surface scratch easily..Photo? Cheers Chris Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: Exposed Agg specialist 7Feb 14, 2020 5:26 pm Poor Mix? Did you get the mix specified and get the paper work from the concrete supplier? Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: Exposed Agg specialist 8Feb 14, 2020 5:30 pm [img:39ia5m9g]https://forum.homeone.com.au/u/61703_1581665299.jpg[/img:39ia5m9g]
[img:39ia5m9g]https://forum.homeone.com.au/u/61703_1581665311.jpg[/img:39ia5m9g] Theyre denying that its a poor mix, Im guessing suggesting an acid wash maybe caused it? We are being told it needs to be sealed but I think the concrete is just rubbish. Its just difficult to prove if its the concreter or concrete? Of course noones taking the blame... Where do I go next? Re: Exposed Agg specialist 9Feb 14, 2020 7:31 pm If they are denying that it's a bad mix, then they have trowelled it to early (before the bleed water has evaporated) or to much. That has the effect of weakening the top layer and leads to problems like you have. It often happens when grano workers are rushing to get home. The level of exposure isn't to bad though a little heavy in some spots. Accessible Carpentry & Cabinets accessiblecarpentry@gmail.com accessiblecarpentry.com.au https://www.facebook.com/pages/Accessible-Carpentry-Cabinets/583314911709039 Re: Exposed Agg specialist 10Feb 15, 2020 6:33 am Also the concrete wasn't vibrated properly? I can see air voids, hence the porosity, below the surface the acid wash and water would have removed the trowelled surface exposing the poor workmanship I'm guessing you don't have the engineering notes/specification for the drive way Strength, Slump, Compaction, vibration, joints, etc would have been hi-lighted for the Concretor? If not then it's buyer beware and always have the concrete placement inspected On the other hand, check with QBCC Cheers Chris Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: Exposed Agg specialist 11Feb 15, 2020 6:38 am So if it was in our building contract for the builder to do the driveway, they have to be held responsible right? Its their trades. There are definitely air bubbles, its really evident on the alfresco. Ill contact QBCC I guess Re: Exposed Agg specialist 12Feb 15, 2020 6:44 am Track down the Engineering Details and Notes in the building contract If the builders isn't forthcoming then the council building department should have all certified submitted documentation Your building contract States the works should be completed in a workmanlike manner and ensure the works are adequately supervised, then check who supervised the work Post back after you have the paperwork Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: Exposed Agg specialist 14Feb 15, 2020 7:00 am The certifier can only check what is given to them I suspect they weren't given all the paper work. please check Qld has the best regs in Australia Concrete Inspection Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: Exposed Agg specialist 15Feb 15, 2020 2:13 pm It's a placement issue. The fact that you have the same issue in two separate areas that were poured on different days tells you that it wasn't a mix problem. The grano workers just haven't done a good job. 100mm driveways and paths are never vibrated, adequate compaction is achieved in the placement, screeding and trowelling. I'd say the job wasn't screeded and bull floated adequately to give the early compaction, then they have rushed the final trowelling which has left too many fines at the surface. Once the retarded layer has been washed off you still have a softer layer that allows the aggregate to fall out and also means that layer that will scratch as you have demonstrated. Sealing will never fix that. Sealer is only to prevent staining as it seals the porosity of the concrete, it doesn't make it harder or prevent the issues you are seeing. Getting it rectified will be the issue. Your contract is with the builder and they will argue that the issues are "minor" and are not considered defective, even though you can easily argue the opposite. Structurally it may be fine, meeting all the requirements for thickness, steel, and various joints but visually it isn't what's expected from a quality exposed agg job. Accessible Carpentry & Cabinets accessiblecarpentry@gmail.com accessiblecarpentry.com.au https://www.facebook.com/pages/Accessible-Carpentry-Cabinets/583314911709039 Re: Exposed Agg specialist 16Feb 16, 2020 12:20 am StructuralBIMGuy Also the concrete wasn't vibrated properly? I can see air voids, hence the porosity, below the surface the acid wash and water would have removed the trowelled surface exposing the poor workmanship I'm guessing you don't have the engineering notes/specification for the drive way Strength, Slump, Compaction, vibration, joints, etc would have been hi-lighted for the Concretor? If not then it's buyer beware and always have the concrete placement inspected On the other hand, check with QBCC Cheers Chris Re: Exposed Agg specialist 17Feb 17, 2020 3:02 pm No need to guess what actually went wrong as it's a combination effect ie initial set, lack of compaction/vibration and the concrete should have been inspected What matters happened on the day the concrete was being poured and you weren't prepared for that and I doubt you had the engineering drawings, specifications, notes and it was't Inspected by your engineer.... so you will never know? Lodge a complaint with the QBCC, sorry, but I don't like your chances. Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: Exposed Agg specialist 19Apr 18, 2020 10:37 pm Sorry to hear about your problem Alymei. If you can't get any joy from your builder I would look into the use of a concrete sealer such as https://www.on-crete.com.au/products/Hi ... V26-21.htm if you want to keep the exposed aggregate finish. Re: Exposed Agg specialist 20Apr 19, 2020 1:43 am theshack Sorry to hear about your problem Alymei. If you can't get any joy from your builder I would look into the use of a concrete sealer such as https://www.on-crete.com.au/products/Hi ... V26-21.htm if you want to keep the exposed aggregate finish. Thanks - the builder offered this but unfortunately we believe that the alfresco area is too far gone for this to be of any benefit. Building Standards; Getting It Right! Hi all, My neighbour has built his 15m long garage on our boundary. It was agreed as part of the planning permit that the wall must be in exposed recycled brick. For some… 0 10892 Last year I had a gas leak at my house. 3 days later, I have about 1 sqm of my exposed aggregate paving broken up. I am not sure how to go about getting it repaired… 0 10404 After some ideas on making our patio kid friendly . Currently we have exposed aggregate. 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