Like I said earlier, the concrete mix had Titanium Oxide in it for 'colorant'. That bridge was built and left to cure (hopefully)28 days BUT the test cylinders are subject to that same 28 day time period. If ANY tested weak, how to determine where on the bridge the defective product was placed? Slump is a good indicator but the additive for colorant? I was always taught that anything added beyond the four basic ingredients weakened the ultimate product.
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Today's Featured Article - A City Guy's First Tractor - by Fred Hambrecht. After living in apartments in Atlanta for more years than I care to remember, the wife and I decided to move to the country. Humming "Green Acres is the place for me..." we purchased a 29 acre tract about 60 miles south of Atlanta. Next came the house, I could talk about that ordeal for another two weeks... But, I want to talk about my tractor! We didn't even own a lawnmower, and all of a sudden we had enough grass to feed all the starving children of the bovine world. Naturally, I talked
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