Cement brick machine products is cemented tailings material unburned product, its strength and durability of production and development , mainly based on the hydration of cement , and gradually make the body condensation forming and hardening . Since cement is a type of cement matrix , therefore , fully or not, as well as the speed of the hardening process, the hydration process will directly affect the performance and productivity level of the final product . The basic conditions for major cement hydration is essential to maintain a certain temperature and humidity. The higher the temperature , the faster hydration , strength development is also faster , but if the ambient humidity is too low at this time will result in re- hydration products dehydrated and dried to produce a crack , is not conducive to improving strength. If the temperature is below o ℃, or moisture evaporate prematurely , the hydration reaction will stop , the intensity is not only no longer develop , it will severely decline , and even destroyed. Thus , after forming the green body to maintain proper temperature and humidity , at least in the initial curing , the temperature and humidity of the environment to maintain a high level is necessary . According to the conservation process of temperature and humidity conditions and work systems , conservation methods can be divided into several conservation of natural conservation , solar energy conservation , heat conservation , dry heat curing , carbonization maintenance, conservation and other dipping . In particular, we recommend heat conservation . Heat conservation is blank after forming off , placed in a steam environment conservation measures to accelerate its hardening . By the nature of the medium of steam , the steam can be divided into two ways of conservation and autoclave curing . The former is at a temperature not higher than 100 ℃, relative humidity not greater than 90% of the medium in the saturated steam ; latter is in a saturated steam of 100 ℃ high temperature medium for the high pressure environment . For cement concrete cemented tailings unburned material , the general use of steam curing atmospheric conditions. By steam curing and hardening of concrete greatly accelerated through a steam curing cycle ( typically about loh), can reach about 70% of the design strength , which can greatly improve production efficiency. However, due to steam curing process, the coefficient of expansion between the different constituent materials and the generation of a large number of premature hydration products continue to hinder the hydration of cement and other reasons , steam curing concrete post ( 28 days ) strength more often than standard curing specimen 7% a 20%, Jt hunger and cold resistance and impermeability will have different degrees of decline. In order to minimize the adverse effects caused by steam curing , steam curing process must be carried out strictly according to certain systems . The so-called pre- steam curing system means raising , heating , thermostats , cooling the various stages of the process parameters , including pre- raising time, heating time ( or speed ) , constant time and constant temperature , cooling time ( or speed ) , etc. Different varieties of cement , water-cement ratio of different sizes and different body , often corresponding to an optimal steam curing system. From the body to begin forming a stage called pre- heating of support , the purpose is to get some advance concrete temperature to avoid damage caused by excessive rapid warming. Depending on the cement setting speed , water-cement ratio and other conditions, you can select a pre- raising period is generally between 1 ~ 3h. Warming period is caused by damage to the concrete structure stage , if the speed is too fast , it will affect the quality of the product.