What we want to do is to create a kind of shell which with very free form by pouring the concrete onto sandpile. After a test——concrete with different consistencies pouring onto the same sandpile and evaluating the performances, we are looking forward to finding the most suitable consistency for a concrete shell.
Firstly we made a test showing what can 10 gram water do in a default mix, we added 10 more gram water each consistency and poured them onto a slanted panel. They performed wide differences which totally beyond our imagination.
Then we began to deal with the main question. We made four different consistency (the diagram shows the exact figure) and poured them onto the sandpile, trying to made them flew freely and tolerating the overlapping part for better evaluation.
From the experiment on how concrete flow with different consistencies, we learned that viscosity did have great affect on how it shaped. And the amount of water decided concrete’s viscosity. Concrete of mixture 1 and mixture 2 flew quickly and hard to shape, after decreasing the water, it became easier to shape the shell. Therefore, for further development, concrete between mixture 3 and mixture 4 can be used to shape a shell, with appropriate flowability to extend and enough viscosity.
Assignment 2 calculations:
The first cast, where the sand was the variable, our cast was very nice, compact and grey because we only used cement and almost no sand.
The second cast, with water as variable, we had very little liquids in the mix. This resulted in a very dry “cake” that fell apart when taking it out of the form.
When it comes to the last three, with pigmentation, almost no colour change can be detected. When mixing the three we felt that we needed to add more water. They where too dry to put into the formwork. Unfortunately we just added random amounts, and also different in between the different casts. therefore there is a difference in colour and density between them.
Image source: http://natuurfotografie.nl/natuurfotograaf-ronald-van-wijk-in-beeld/
Made by: Wind and water flows
When a wind or water flows across sand, the sand is dragged along the bottom and often is piled up to form ripples
“Ripples in sand, found on both beaches and dunes, are one of nature’s most ubiquitous and spectacular examples of self-organization. They do not result from some predetermined pattern in the wind that is somehow impressed on the surface, but rather from the dynamics of individual grains in motion across the surface.”
(Daniel M. Hanes in the department of coastal and oceanographic engineering at the University of Florida, Gainesville)
It facinates me that the strong power from wind and water can establish such a small size, beautifull and playful pattern.