Concrete Contest
Peter vs Ufok
(sorry to disappoint you, Ufok)
Creating the Plank
We created our concrete plank using foam installation for the mold. We caulked all of the cracks to prevent any leakage and used the clamps to make sure the concrete did not expand past what the mold could hold. The bottom of the mold was covered with bubble wrap to give some texture and the top was covered in plastic wrap to prevent any moisture for getting in.
Inside of the concrete is one thick piece of rebar, stretching the distance from end to end, help up with skewers as spacers. There are smaller pieces of rebar that do not span the whole distance but run in the same direction.
How much weight can our plank hold?
Ufok
not impressed
Held over 500lbs for a bit before
it collapsed :(
The wood skewers were there acting as a spacer to hold up the rebar. Where we messed up is not having reinforcement running in the perpendicular direction from the rebar. We did have metal fencing cut to use as mesh but it got kicked out of the construction because we did not think it was rigid enough.
rip
reflective spray paint
Britton added in metal aggregates
The concrete mix to water ratio was also off. We can tell this by looking at the rebar and seeing that the concrete did not bond to it. We were also able to crumble the concrete in our hands which is evidence of a bad concrete mix. In the video below, Laurin cleans off a piece of rebar by knocking off the still moist concrete.
Peter
