RE:RE:RE:RE:RE:PEAWhat do I know about concrete? How about being a journeyman cement mason. I've built everything from bridges to outhouses. I don't need to search the web for obscure terms to make me look smart. Btw, it shows you to be a moron. I know glacial till has been washed by nature for tens of thousands of years, not just busted out of hard rock that still has alkali, or any other reactive incorporated in it. THE BEST AGGREGATE IS GLACIAL TILL OR RIVER ROCK, WHICH IS ALMOST THE SAME THING. Like I said, I've placed hundreds of thousands of yards of concrete, so I know what I'm talking about. How about you? Moron!