Aluminous cement - get acquainted with the peculiarities of mixing mixture

aluminous cement: the scope of use

Apply the compound in cases where it is necessary to accelerate the work on cementing.So, it is used with the rapid construction of facilities for the concrete structures of bridges, underground construction (including shafts and subways), for industrial buildings, when embedding in the basement of cracks in various emergency situations, for lining of all types of furnaces (thermal,roasting) and in many other situations.

Especially recommended Alumina part in the construction of structures made of reinforced concrete for special purposes in the factories, that is, where are available ready-made products.They may be shuttering after 12-16 hours (due to rapid drying of the mixture).However, undesirable to use this material to create designs more than 1 meter in width.It is proved by the fact that within the array develops a temperature above 70 ° C, and hardening takes place abnormally.Whereby strength can be much lower.

Alumina Cement: properties and specifications

this material is made in accordance with GOST 969-91, according to which the amount of alumina in the cement should be at least 35%.This mixture is subdivided into the following brands: 40, 50 and 60. Each of them has its physical and mechanical characteristics.Compressive strength per day is equal to 22,5-32,4 MPa, for three days from 40 to 60 MPa.The setting process starts after 30 minutes and ends after 12 hours.Volumetric weight in the dry state is 850-1100 kg / m3.

If we talk about the properties of this material, we can distinguish the fire-resistance, heat resistance, durability, strength, resistance to various aggressive media (gases and liquids).A particular advantage - the opportunity to cement curing in wet conditions.And if you add this part of the concrete, it becomes frost resistance and water resistance.

Note! best conditions for hardened high alumina cement (not to be confused with the mass of heating t) is considered to be the average temperature + 15-20 ° C.Also the temperature may be above 30 ° C, but the strength of the material with decreasing (at least three times).

Application Conditions of aluminous cement

tell about application composition technology will not, since it depends on where in the construction industry, it is used.Just describe the conditions in which it is better to use.The principle of the manufacture of heat-resistant cement completely different from ordinary Portland cement mixing with the only difference being that it is not necessary to mix for too long in the mixer (remember that the mass hardens quickly).In the process of curing is necessary to provide a wet mode (for example, protection from the sun).

During compounding conditions for mass heating.If this has not been done, the concrete within a day poured cold water.Watering is carried out in the beginning of the heating.Well, or not later than 8 hours after application.In

when winter concreting is done at a temperature of -10 ° C, then for any procedures to heating and can be omitted.One has only to avoid one moment - freezing in the first 1-2 days.When severe frosts have to take into account that the ability of the mixture to thicken considerably multiplied.