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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