Abstract
Urea has been utilized in concrete technology to reduce the temperature cracking and promote winter construction property. In this work, the influence of urea on cement hydration and carbonization resistance of cement-based materials was studied through carbonation depth experiment, isothermal conduction calorimetry, XRD, BET and water vapor sorption. It is indicated that the reduction of rate in the hydration acceleration period can be attributed to the increasing pH and lower supersaturation when urea is added to the cement mixture. In addition,the existing of NH4+in pore solution andpH profile results in the decrease of decalcified C-S-Hdeterioration rate,which prolongs carbonation duration to asimilar depth. This study provides a new admixture way to improve the durability of cement-based materials to prolongthe life of reinforced concrete.
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