-Immediately after pouring concrete, and within 7 days after that: concrete must be maintenance avoid dry too fast and protected from the harmful impacts of forecast as: rain, sudden weather changes, wind ... The method of maintenance to be used are subject to the approval of the supervising.-Maintenance of concrete works great to correct strength development of concrete with design requirements. Maintenance process method of concrete made under TCXDVN 391-2007 "heavy concrete-moisturizing requirements."-Maintenance process of wet concrete is divided into 2 phases: the initial maintenance and maintenance. This and the next two stages are continuous with each other.-Maintenance: the original watered or covered up the concrete surface with a material that has been moistened (sand flat face, how claims to dip the water...) to keep water in concrete due to the effect of climate factors on the outside (Sun, wind, temperature, humidity, ...).-Maintenance of next: proceed to the next with the initial maintenance until the concrete reaches 100% intensity. During this period, regular watering keep concrete moist; the number of watering during the day depending on the temperature, weather, always ensure the concrete surface is always wet. Concrete maintenance periods follow laws and maintenance of concrete.
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