Assignment 02 – gradient – group 10

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Mix 1. with 8.5 parts sand falls apart when touching it.

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Mix 2. with 1 part water got a very smooth surface.

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Mixes 3-5. 4% pigment. We needed to add 60 g water to the mixes to make the concrete workable.

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Assignment 2, AnnaEmanueleHanna

Group 1

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.

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Group 4 – Assignment 2

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Mix 1

Cement           62,5 gr

Sand               168 gr

Water             25 gr

 

Mix 2

Cement           62,5 gr

Sand               187 gr

Water             25 gr

 

Mix 3 – Blue

Cement           62,5 gr

Sand               187 gr

Water             25 gr

Pigment          2,5 gr

 

Mix 4 – Red

Cement           62,5 gr

Sand               187 gr

Water             25 gr

Pigment          2,5 gr

 

Mix 5  – Black

Cement           62,5 gr

Sand               187 gr

Water             25 gr

Pigment          2,5 gr

 

All of the five mixtures were basically the same mix (default mix) except for the first, which had a bit less sand in it. It was not more fluid and than other ones and all of them were not fluid, they were more stiff and grainy. Because of the scales lack of precision we accidently poured too much pigment in mix 3-5. We learned that for next time; get more accurate result, we need to have larger proportions and/or better scale.

Assignment 2—Group 8

Mix 1 : 7,5 parts sand.

Mix 2 : 0,8 parts water.

Mix 3,4,5 : 3 % pigment.

We started with mix 3, 4 and 5. The pigmented mixes.

*1  This time we decided to make one big mix based on double the amount of cement in the default mix. Then we divided into three and calculated 5 g of pigment in every bucket of mix. We added the pigment into the dry ingredients. Something went wrong again and we realized the importance of precision when putting all things together. So we decided to not make one big mix and divide it again.

*2*3   For some reason a kind of fat texture appeared in the buckets when we added water and the pigment did not blend well. Where there traces of fat dirt in them from earlier experiments?

We called for help and Annie- Locke came to the rescue.

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She pointed out and helped us adjust some things:

*4  Write out the recipe first with all steps included so you easily can go back and analyze your mix.

*5  Small buckets on the small scales instead of large that can set the scale of. We also started to measure one thing at a time instead of putting the scale back to zero all the time and then add the next ingredient. So, if something go wrong you can always double-check separate ingredients instead of losing a hole mix, when unsure.

*6  Pigment is to be added with the dry ingredients.

*7  *8  It is also good to add a little water at a time and allow the dry ingredients react correct and work up the moist.

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*9  We got the end result we aimed for, with some minor adjustment to the planned mix. *10  Mix 1 and 2 worked out fine and (*11) here is the end result.

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Assignment 2, Group 1

mix 1

250 g cement

125 g sand (0,5 parts instead of 3)

100 g water

 

mix 2

250 g cement

750 g sand

25 g water (0,1 parts instead of 0,4)

 

mix 3

250 g cement

750 g sand

100 g water

0,25 g blue pigment (0,1% of 250 g cement)

 

mix 4

250 g cement

750 g sand

100 g water

0,25 g red pigment (0,1% of 250 g cement)

mix5

250 g cement

750 g sand

100 g water

0,25 g black pigment (0,1% of 250 g cement)

 

mix 1

The mix was very liquid, and made a strong smooth shiny sample when hardened.

mix 2

The mix was very dry. It was like wet gravel, and we could not pour it into the form but had to press it in. When hardened it was very fragile and broke when removing it from the form.

mix 3-5

The mix was wet, slow flowing, in consistency. Became hard but with a rough texture when hardened.

Due to the low percentage of pigment and low mass of concrete it was really difficult to meassure the correct amount of pigments. The low percental amount of pigment also made the change of colour almost unseeable. (From the 3 group members one could spot a difference of colour between the samples, 1 could not spot a difference and the third was unsure.) Could also not notice any difference between the three mixes in terms of consistency or texture.

 

assignment 02 – group 07

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group 07 – ferdinand getz / tristan guibert / pia hocheneder

mix 01: sand 6.3 parts

mix 02: water 0.7 parts

mix 03/04/05: pigments 2.5%

mix 01 turned out to be too stiff to get all the air out and to get a smooth surface, so it ended up looking like gravel. The mixture was not liquid enough to distribute in the form properly. However mix 02 contained too much water, so it took a very long time to dry, longer than the other samples. But it turned out smooth and shiny in the end.

The blue and black pigment did not mix properly with the cement, but the surface of the colored ones is very shiny and smooth. Only the red pigment spread evenly in the mixture.

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