2014年9月25日星期四

How much water should added to castable

Various castable binder containing all the appropriate amount of water fittings, which can be composed of mixtures of water and then added to the binding agent with acidic materials, such as condensation and faster Yasumizu of calcium aluminate cement would castable  refractoryoften order kind of form. May be previously mixed with a binding agent made ​​of a concentration of an aqueous solution or sol added in the form, such as pre-hydrolysis in order to be combined with bonding agent has such properties are mainly in the form. When there is no deterioration of the reaction casting compound binding agent and water, the bonding agent is evenly distributed in the casting compound, are often pre-mixed with water, acid and water glass as described above is so treated.
The cement binding agent, the setting and hardening speed and strength of the hardened cement and cement properties in addition to the outside, is mainly determined by the amount of water (water-cement ratio) decision. According to the most appropriate varieties castableof cement and water-cement ratio should accordingly in its water-cement ratio – the intensity curve selected, and nearly at the peak were appropriate. Castable refractory cement ratio – are all their intensity curves are generally characterized by a single peak curve, but the peak is not the same (see Figure 7-1). Not only does it vary depending on the type of cement, water absorption and pellets, shape, surface features and construction means when densification is not the same, the peak has also been changed. In production, in order to ensure the strength of castable, in the selection of appropriate water-cement ratio, should fully consider all aspects of the above. Alumino silicate generally binding by ordinary alumina cement clinker made ​​castable cement ratio used mostly 0.4-0.65. Among those who often take 0.5-0.65 vibration molding, mix the water about 8% -10%; pressure molding machine who often take about 0.4, about 5.5% water mixture -6.5%. In order to reduce the moisture castable, increasing the density of hardened body, should be added in castable appropriate plasticizing water reducer.

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