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1/12 Scale Model Results

The 4 foot by 10 inch model has been successfully constructed using the materials and assembly techniques largely as planned. This page is a report on what has been learned in this phase of the project. The information is in three parts. First a series of photos of the assembly process. Second a list of problems encountered in the construction, how they were resolved, how we will modify the assembly process for the 12 foot ¼ scale model in the next phase. Last is a report on the results of testing on the completed 4 foot model. That testing has not yet begun.

Assembly Photos

Ready to rock

Wired-up cell remesh to floor.

Added floor and wall poly sheet. Setup wall form and spacers.

Poured normal concrete floor layer.

Placed and filled water bags. Poured cellular concrete inner partitions.

Placed roof remesh. Removed outer wall spacers.

Poured normal concrete outer walls and roof. Removed form. Water bags have not yet been removed

Problems Encountered in Assembly

This will be less of an issue at larger scales. Still, need more care pulling out slack before setting.

This will not be a problem with 6 mil poly (vs 2 mil).

Wrap tube ends with a fragment of open-cell foam or equivalent.

Serious issue. Needs more thought.

Larger scale and wire cell jigs should fix this.

Cell crete was poured in at several points, flowed very well. Coordinating bag filling with the pour remains to be tried.

So be neater about it next time.

Not much to be done about this. Will be a `little better at larger scales.

After set but before cure, this edge was dressed with a wood scaper.

Underscores importance of controlling thickness. Should be less a problem at larger scales.

Testing Results

Lift model by 4 inches.

Transfer to an adjascent bag.

Standing “friction”.

Airbag punctures or leaks.

Floats at all.

Freeboard compared to design.

Floats flat.

Porosity, seapage, leaks.

Thickness of roof.

Thickness of floor.

Thickness of outer wall.

Thickness of cell walls.

Cell corners and edges.

Roof layer leakage into cells.

Exposure of cell remesh.

Crush-test model at center, over 1-cell area.(how to generate such a load?)

Compression test sample of outer skin.

Compression test sample of cell walls.

Break-over test across diameter.