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.

 

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