Testing the Slab

Today I uncovered both of my dome shaped slabs. Slab#1 (which i made too thin) broke as me and Siyabonga were trying to lift it off the ground :-(
But.. Slab#2 survived!! :-)
So we tested it, first with just my weight, which was ok!:-) Then with 3 people. It managed to hold for about 2 seconds...and then broke into bits!:-(

I reckon it broke partly because we didn't have enough big stones in the concrete mix (so its easy for cracks to propogate).