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- W2000744343 abstract "Objective: The study focused on the application of urea to the cold weather concreting. One of the advantages of this method is to simplify curing after concrete placement at low temperatures; only an anti-evaporation sheet is necessary to keep fresh concrete wet until finishing of concrete curing. Method: Urea is used at level of 6% by weight of cement dosage in the mixtures. After casting, one group of concrete samples were cured in the different deep freezes at -5, -10, -15, -20 °C for 7, 14 and 28 days and then the same samples were cured in water for 7, 14 and 28 days in accordance with ASTM C 192. Compressive strength of hardened concrete was determined according to ASTM C 39. Results: At -5 °C and -10 °C the admixture’s positive effect is evident but at -15 °C and -20 °C the same effect was not achieved when compared to mixes without antifreeze admixtures. As a result at cold weather concreting, urea can be an effective alternative to the other precautions up to -5 °C without any protections. In this paper Scanning Electron Microscopic (SEM) observations also helped to explain the effect of Urea on concrete under cold weather conditions." @default.
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- W2000744343 date "2014-08-01" @default.
- W2000744343 modified "2023-10-16" @default.
- W2000744343 title "The effects of urea on strength gaining of fresh concrete under the cold weather conditions" @default.
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- W2000744343 doi "https://doi.org/10.1016/j.conbuildmat.2014.04.008" @default.
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