How to maintain cement board
After the cement mortar is plastered, the moisture in the drying process needs to be volatilized and lost, especially when the temperature is high in summer. In the case of rapid loss of cement mortar, prone to cracking, so the need for water, so that the cement mortar is not so fast to dry, so as to avoid cracking.
Cement This cementitious material is a hydraulic material, must be fully hydrated process in order to make the cement strength to achieve the desired value, in the dry, the cement hydration process will be terminated. Popular point, if the hydration of cement needs 8 days to achieve the desired value, but it is dry for 2 days, the hydration process is terminated, its strength will be particularly large losses. So, every day timely water, but also to keep the cement hydration process to continue.
According to the difference between the season and the temperature, the cement is fully hardened, that is, the maintenance of the general principle is 28 days, but the actual project which has a greater access, the specific maintenance period should be based on structural type, cross-sectional size, concrete label, cement varieties Temperature, humidity, evaporation, curing technology and other conditions to determine the specific, but the general summer curing of ordinary concrete 15 days is sufficient to achieve the winter sometimes, such as concrete pavement sometimes poor conditions or even two months are difficult to achieve sufficient strength, but no matter What concrete what curing conditions, the first 7 days must ensure that the cover insulation moisturizing conservation, for the harsh conditions of conservation can be used to warm water or even pressure water conservation.
The role of water conservation has two: First, in order to prevent cracking, the second is to ensure the full hydration of cement to complete the formation of cement strength.
Of course, this method of watering is the general civil construction process. If it is engineering, then every day to be exhausted and can not accurately grasp the water, then how to do it? It will use special mortar, that is to add in the cement mortar admixture, so that the cement mortar has some different special features. In the special mortar, if you want to solve the above problem, the need to add hydroxypropyl methyl cellulose, this thing is called inside the water retaining agent, adding it, the cement mortar drying time is controlled, do not need to water every day Cured.
Cement mortar plaster to water conservation, to avoid cracking, is scientific, it is necessary to do so.
