Concrete traces

Group 9, Assignment 03

We are interested in the pictures on the given assignment papers—-the study of splashes. Cause it’s really intriguing what will happen when we don’t shape the concrete by mould or hand, but just enter different projectiles into amorphous concrete to see the unexpected effects. We choose to use different kinds of projectiles (big/small, plastic/metal, sphere/annulus) and test them with different fluid concretes (with different masses of water).

Picture1

(Except water, we used the basic mix from the assignment.)

Text 1-①, 11:30, 0.100+0.030 kg water

At first, we made the default mix and drilled it for a while, but the degree of fluidity was not enough. Then we added 0.030 kg water and put it in the container cause it was so stiff that hardly flow itself, and we pressed it to flat. When we dropped stuffs, most of them were on the surface of the concrete, even can not leave traces.

2

Text 2-③, 11:40, 0.130×2=0.260 kg water

To the second experiment, we doubled the water to make it more obvious. But it seemed too fluid this time (almost water-like) that we can pour it to the container easily. When dropping stuffs, many of them submerged to the inside and cannot be seen anymore.

3

Text 3-②, 11:50, (0.130+0.260)/2=0.195 kg water

To the third experiment, cause we cannot see obvious splashes or traces in the first and third ones (we guessed that water was too little and much respectively), we averaged these two and made water 0.195 kg. And this time, stuffs were half sunk to the concrete but still no splashes.

4

12:30

In order to observe the traces, we used pinchers to get stuffs out of concrete. Obviously it destroyed the patterns a little. As a wrap-up, the depths of traces differ due to the degree of fluidity, the strength and the height we dropped and the mass of the stuff. But we still don’t know why there are no splashes like the given pictures.

5

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