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We supply ready-mixed concrete to residential contractors in the Northeast. During cold weather, our customers order concrete with 2% calcium chloride but then add more flake calcium chloride at the jobsite. Are there any harmful effects of this practice? For instance, if the chloride dosage is too...
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We supplied concrete for a wastewater treatment plant for which the specifications required an entrained air content of 6% ± 1%. An elevated exterior walkway required 12 cubic yards which were delivered in two loads. The testing laboratory inspector performed an air test on the first load and told...
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What can cause an occasional load of concrete to exhibit a retarded set? We may batch out three loads of concrete with good setting times, then have a load that's severely retarded, and go the rest of the day without any other bad loads. The next day, the same thing may happen or a few days may go...
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