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Concrete Box By the Yard or Meter – Developing a structure

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This topic contains 2 replies, has 2 voices, and was last updated by Profile photo of georgeberz georgeberz 4 years, 3 months ago.

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    Profile photo of georgeberz

    Concrete Box By the Yard or Meter – Developing a structure

    I like the little yard/3 structure pictures floating around. The units that are then lashed together.

    The idea proposed has merit but, several things need to be addressed

    Making concrete inexpensively and not very labor intensive I keep seeing numbers tossed around from Ellmer in USD $5,000 for a site monthly 2 workers producing 1 cube per day at a net cost of $166 per cube, then it being worth $2,000. (matrix) other quotes I cant remember exactly ofr300 Pounds sterling per ton? Correct me if I’m significantly wrong. I find that there are many sites you could temporarily use for free or pay a small rent if your willing to have no utilities, power, water, phone. Perhaps building on a fresh water tributary that flows into the ocean like some place along the Sacramento river delta that flows into the San Francisco Bay.

    I understand why people want to use a cube as it is scalable and can make varying size structures. So a Yard or a Meter is not a fixing point.

    Lets assume Yards/3 and US Dollars

    1 yard of redimix concrete form a plant is about $120 delivered in a 8 Yard /3 load if you take less the cost goes up as it is called a short load. Also redimix is made with a 5 sack mix (94 lb sack of Portland cement)

    Mixing small amounts of concrete by had is time consuming and labor intensive. I would prefer to make the concrete myself with the proper equipment . As a sack of Portland cement is less than $9 and usually in the $8 range and I would like to make concrete with a 6-8 sack mix or 9 sack mix and add PVA fibers instead of steel (more on that later) I believe if made yourself this way it would run about the same and you have better quality control.

    Since we are talking about “production” I would like to use the Cart-Away concrete cube batch mixer http://www.concretecube.com/ it is capable of 1.5 yards every 10 minutes. Loaded with a bobcat skid steer 90% of your manual labor could be saved. I would recommend a crew of 3 driver, and 2 helpers. We now have a easy way to make quality concrete with minimal hard labor. I see potentially easy pace 16 in a 8 hour day. Labor would run here $100 a day per person so $300 / 16 units = $18.75 a unit + $120 for the concrete basically $140 per unit and each unit could potentially be 2+ sq Meters of deck space

    The mould

    I believe again that the mould should be made with 1 yard of concrete in mind approx 3700 lbs that is a easy weight for most small construction machinery to move around. Also I’d like the blocks to interlock with the neighboring block. Imagine floating a block to the structure and having a simple crane system on the structure or next to the land to lift the block and slide it in a key-way, perhaps pinning it in place joining the pieces.

    Furthermore the mould should be steel plate thin, with angle iron supports as you want each piece entirely uniform.

    So I have described a mixing, casting and construction method.

    Questions I do not know.

    Concrete has massive compression strength but limited tensile strength, adding PVA fibers will substantially increase the tensile side and the compression needs no assist.

    How tall should each piece be, how large of key-way is needed.

    Looking at the raft with the multiple pieces cool, but what happens when a wave hits the structure? How large of a wave can it resist? What about the bending and twisting effect on a large structure? How tall of a structure vs how long the platform?

    I believe a near circular structure as possible would be best as the loads form a wave would be more evenly distributed across the area better.

    Possibly a 6” wall structure? How large would the casting be? You could also cast a X inside the cube to brace it better imagine a X with walls all around it like a roman numeral 10 with sides cast on, I hope I’ve conveyed this.

    I would like the structure to be ocean going at mass floating not planing speeds but I am afraid of 10-20′ swells that occasionally happen, perhaps on inland waters or protected bays but then you WILL have issues with people calling it a houseboat and there are many laws AGAINST houseboats and people living on them in the USA.

    I love the idea of seasteading and getting away from local municipalities rules and regulations, there are much less rules on the waterways and seas as I am looking for freedom and independence trying to discuss and open my eyes to all the possibilities out there.

    Thanks for reading, I will be posting this to my discussion forum as well http://OutpostAlpha.com


    Fresno CA USA

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    Kewl! I like that “Concrete Cube”. reminds me of the “Power Cube” http://opensourceecology.org/wiki/Power_Cube from the “Global Village Construction Set” http://opensourceecology.org/wiki/Global_Village_Construction_Set, which is something any seasteading effort intending to be sustainable needs to incorporate. In fact, this Concrete Cube could teach the GVCS a thing or two. http://opensourceecology.org/wiki/Cement_Mixer

    A Material Handling System would almost entirely obviate the need for the Bobcat driver. It would also make the recipe more consistent batch to batch. Keep the hoppers full with regular deliveries and let the system handle itself.

    I have a thorium reactor under the hood of my car. I get ∞ miles per gallon.

    Profile photo of georgeberz

    Ellen The concrete cube is loaded by a bobcat, material is dumped on the top of the unit and a conveyor on top moves the material into the mixer. once mixed you still need to move the concrete to the casting area. My bobcat holds 1/3 yard so 3 scoops to load the mixer and 3 to unload, each bucket moving a little over 1000 lbs with little to no effort, just sitting in the airconditioned or heated cab of the bobcat!

    And yes the global village construction set is awesome!…

    1 thing at a time…. so we design with modules that bolt together or fit together, come on people, lets all pull in one direction.

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