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.



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.


*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.