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Tractor Talk Discussion Forum

Re: O/T cement question. Made for the old timers

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Dachshund

07-23-2006 04:55:47




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When I worked for the Kansas DOT, we did a study on some older concrete. The samples came from I-35, US Highway 50, and OLD US 50. These roads were built in 1967, 1952, and 1918, respectivly, and all samples were taken within a couple miles of each other, where the roads run nearly side-by-side east of Emporia, KS. We found that the cores from 1918 consistently tested conciderably higher than the others! The samples from the newest road tested worst by FAR. In 1918 you had a truck load of rock that was dumped into the mix - what ever was on the truck went into the "mud". By the 1950's mixes were being designed that included more medium fines. By the 60's, most mixes (and EVERY state will differ) began using a lot of "fines" with the theory that they would "bond" the mix like glue. It's just another shining example of engineers out-thinking themselves and trying to earn a piece of paper that isn't worth very much!

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