This compression system is a very handy invention, especially for Web users, because it lets you reduce the overall number of bits and bytes in a file so it can be transmitted faster over slower Internet connections, or take up less space on a disk.
Concrete hardens to 600PSI (Minimum) after 24 hours. This means that 5 three grown men could all stand on a pogo stick (if that were possible) who's base covers 1 square inch without harming the concrete. You walking with shoes on exert about 10 PSI, well below anything that could damage the new pour.
How long do you have to wait to walk on tile before you lay it? We are going to have ceramic tile put down in our kitchen, and I was wandering after you lay it, how long do you have to wait until you can walk on it? Update: I meant after you lay it, sorry.