2014年8月29日星期五

Low cement castable drying method

To prevent low cement castable burst, in addition to what we know to add anti-burst agents,castable permeability increase, there is an effective and more important measure is a reasonable use of heating and drying systems, control and reduce the drying process castable maximum vapor pressure value inside. When a material selected construction is completed, castable  refractorythe only reasonable means to resolve the burst of dry heat, dry heat system is unreasonable if, even castable high permeability also cause burst. Different curing temperatures, different drying systems, in castable inside will produce different vapor pressure when the maximum vapor pressure exceeds the strength of the material up on the anti-burst occurred. Low cement castable is prone to burst, be especially careful when dry.
Different curing temperatures low cement castable, temperature and vapor pressure generated during heating are also different. In winter construction, due to lower curing temperatures during drying may have a greater vapor pressure, heating and drying should be careful.
Heating system to a certain surface heating refractory castable, castable construction body steam pressure due to different heating systems and there are significant differences.castableConventional dry heating system of the stage, before drying, heating only half of the drying occurs near the surface, while in the second half of the rapid drying temperature, the internal construction of a sharp increase in the vapor pressure of the body. Pose a safety rate drying system (castable tensile strength and maximum steam pressure ratio) declined.
Ideal system should be safe drying temperature is high, the drying efficiency is high, uniform release of vapor pressure in the drying process, and the vapor pressure is not excessive. When using the continuous heating system must be adapted to the conditions specified for each material. The application of a uniform material drying system to ignore the similarities and differences, it is likely to induce burst, must pay full attention. Also, consider the impact of the construction body shape, thickness, and the contact surface, etc.

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