(02-13-2011, 08:44 AM)Ernesto Wrote: Take this example, get a dry sponge, dip the bottom part in water and take it out immediately, notice how the bottom is wet and SOME water will wick up the sponge. Now, lets say your going to drill a hole down in there at 40% level and have a perforated tube. Whats it going to read?
You can also use a sponge to show how concrete drys / curls. This was from Howard Kanare's not mine but he does it in his presentations. Shows how if you take a sponge and wet it, then let it dry on counter it will curl on edges much like a slab will curl along joints. Now take that same sponge and cover it in plastic. It won't curl the same way as it drys. I'm not eloquent enough to explain it but if THAT was on you-tube it would go to all 4,000 architects in my database.