Anyone know concrete mix design?

[JERRY2KONE]

It would be interesting to hear exactly what mix was used for the best results in regards to strength under the contraints of this test. After reading through some of the suggestions received in here I am sure that everyone would love to know what worked more than other mixes.

[pinkpanda3310]

Cool! Interesting hearing the result and your perspective on it brainy. I am surprised how light the first batch turned out. I guess the result might seem poor given the target 50mpa but you acheived a light weight concrete with standard 20-25 mpa, using plastic no less! I'm sure there has got to be a market for that in future with today's recycling attitude. I recall seeing bessa blocks (large bricks) made with syrofoam balls (bean bag beans) to make them light and easier to handle. Sounded like a fun project anyway (not everyones cup of tea, I know, but thanks for sharing).