Posted by dpendzic on March 17, 2018 at 17:14:51 from (47.18.206.102):
In Reply to: Re: Here is the number posted by whereswaldo on March 17, 2018 at 12:44:36:
concrete cylinders are taken to test for strength. Concrete strengths are based on a normal cure of 28 days, We built prestresed concrete beams and with steam curing would could get the 28 day strength in 12 hours many bridge components are constructed off site and assembled at the job site
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Today's Featured Article - The Mud Daubers and the Old John Deere - by Jon Zehnder. I have a 1941, John Deere Model A tractor I have owned for about a year and a half. This is my first (in case my wife reads this, "FIRST") tractor and it has been a learning experience. After considerable advise and assistance from local tractor nuts and the forums of Yesterday�s Tractors, I had finally got it running pretty well. I have tuned it up, overhauled the carburetor, installed a borrowed, rebuilt magneto, installed a new Power-Trol, patched the radiator, installed new front wheels a
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