Shandong Shengya Machinery Co., Ltd. specializing in the production of various types of brick, brick machine, brick machine, hollow brick, pavement brick and other equipment of the old brick factory.
     The basic condition is primarily cement hydration must maintain a certain temperature and humidity. The higher the temperature, the faster the reaction of hydration, strength development is also faster, but if this time low humidity, can cause dehydration re-hydration products, and produce concrete cement bricks drying cracks, not conducive to the improvement in strength. If the temperature is below 0 ℃, or moisture evaporate prematurely, hydration reaction will stop, not only the strength of development, it will seriously fall, and even destruction. Thus, after the body shape, maintain proper temperature and humidity environment, at least in the early hardening, so the ambient temperature and humidity to maintain a high level, it is very necessary.
The transfer of materials to the cement tailings cement bricks, the strength and durability arise and development, mainly based on the hydration of the cement, and gradually make the body forming condensation and hardening. Since cement is a kind of cement matrix, therefore, fully or not, and the speed of hardening of their hydration process, it will directly affect the performance and productivity level of the final product.
In accordance with the conservation process temperature and humidity conditions and work systems, maintenance can be divided into various ways Nature Conservancy conservation, solar energy conservation, heat conservation, dry heat curing, carbonization conservation, maintenance and other dipping. Of these, we recommend heat conservation.
Heat curing the body after forming the cement brick placed in a steam environment conservation measures to accelerate its hardening. According to the nature of steam medium can be divided into steam curing and autoclave curing two ways. The former is at a temperature not higher than 100 ℃, relative humidity greater than 90% of the unsaturated steam medium in; the latter is in a saturated steam temperature of 100 ℃ high pressure environment for the media carried out. For cement as cementing material tailings concrete cement blocks, the general use of steam curing under atmospheric conditions.
By steam curing, concrete cement brick hardening greatly accelerated through a steam curing period (typically about 10h), 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 constituent materials of varying and premature generate a lot of hydration products continue to hinder the hydration of cement and other reasons, steam curing concrete post (28 days) more often than the standard curing strength The specimen 7% to 20%, Hang freezing tolerance 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 a certain system. The so-called steam curing system means raising the pre-heating, temperature, 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, different water-cement ratio and different body size, often corresponding to an optimal steam curing system.
From the body to begin warming molding stage called pre-raising period, the goal is to advance concrete cement block access to certain temperature to avoid damage caused by excessive rapid warming. Depending on the cement setting speed, water-cement ratio and other conditions, the pre-raising period is generally can be selected between 1-3h. Warming is caused by concrete cement blocks of structural damage phase, if the speed is too fast, it will affect the quality of the product.
Since the articles inside and outside the cooling stage to produce a temperature difference, if the speed is too fast, the temperature difference causing cracks will affect the strength of cement concrete brick increase, and therefore, the cooling speed should be limited.
Shandong Shengya Machinery Co., Ltd. has been committed cement products machinery development, production and sale of advanced equipment, superb technical expertise and two decades of experience, the company has always been at the forefront of research and development center block molding machine market development Follow the advanced technology at home and abroad, to develop products for different investment needs of users, mainly block making machine, hydraulic tile machine, cement pipe machine, mixer, hanging roller machine, telephone poles machine equipment. At present the country with 19 offices and six overseas plants (Nigeria, Tanzania, Algeria, Kenya, Mozambique, Ethiopia) and exported more than 100 countries and regions.