Usage of castable and precautions for construction in winter and summer

Refractory castable use, winter and summer construction precautions

1. Purpose:

Refractory castable is mainly used for high temperature easily worn parts in thermal kiln. Compared with refractory brick, it has prominent advantages: good integrity, high strength, anti-spalling, and the overall life of furnace lining can be increased by 30% to 50%, even several times.It is suitable for construction of complex structure and improve construction efficiency.Good air tightness, less heat loss, energy saving and so on.

2. Storage:

Dry warehouse storage, moisture-proof and rainproof, normal storage warranty period of 6 months.

3. Brief construction instructions:

3.1 water: clean water, PH value 6~8, accurate weighing (unified measuring tool is recommended),

Add 7~8% water to kstj-60 and 6~7% water to fha-70.

Add 5~6% water to kstj-80.

3.2 mixing: a flat mouth forced mixer is used. The mixing tool must be clean when mixing

Not less than 3 minutes, mix evenly before discharging.

3.3 vibration bar: adopt high frequency bar, easy to large but not small.

3.4 construction outline:

3.4.1 the pouring surface of all molds shall be coated with a layer of oil to facilitate demoulding.

3.4.2 apply a layer of asphalt paint or plastic tape to all embedded metal parts.

3.4.3 add expansion joint materials according to the design requirements of furnace body.

3.4.4 the laying size of formwork should be in accordance with the design requirements of furnace body, which should be convenient for application

Also, the thermal properties (line variation, heat) of refractory castable must be considered

In order to avoid large cracks after the end of the oven, it is recommended to press

Size per square meter of pouring and reserved for curved seam.

3.4.5 it is required to use up the pouring material within 30 minutes after mixing

Secondary casting to the specified thickness, vibration until completely dense, original

Is the material does not collapse, less exhaust.

3.4.6 the curing humidity shall not be lower than 90%, and the curing temperature shall be easily between 15-20℃.

24 hours after pouring, winter is no less than 48 hours, raise

The protection period is 3 days.

4. Oven curve, construction notes in winter and construction notes in summer are attached.

Construction precautions in winter

The suitable construction environment temperature of refractory castable is 10-30℃. When the winter environment temperature is lower than 5℃, the construction should adopt the following measures to ensure the due strength and good service life of castable.

1. Strictly observe the general precautions of casting material construction, site sanitation, add water,

Mixing time, vibration, etc.

2. Stir with hot water at 60-80℃.(electric heating can be prepared at the construction site

To boil water in a bucket, the easy way is to buy two 1000-2000 watt electric heating rods and install them on the old gasoline drum, or make a fire directly to boil water.

3, after the construction, take appropriate insulation measures, covering insulation materials, the best is now

Make an open fire to keep the ambient temperature above 10 degrees.Recommended at construction site

Burn some wood or coal for at least 12 hours.)

4. The demoulding time shall not be less than 48 hours. Only when the pouring material has demoulding strength can the demoulding be done.

No hard tapping is allowed.(it is recommended to conduct another 12-hour wood or coal fire curing after stripping)

5. Arrange oven as soon as possible after curing period.

Summer construction matters needing attention

The suitable construction environment temperature of refractory castable is 10-25℃. When the environmental temperature exceeds 30℃ in summer, in order to avoid the quality problems of rapid setting and accelerating setting of castable, the following measures should be adopted:

1, add the amount of water according to the requirements to join, otherwise the strength will be greatly reduced, affecting the service life.

2, using PH value of 6~8 compound requirements of fresh water stirring, mixing machine to clean.

3. It is better to control the time from stirring to vibration forming of one pot of material within 30 minutes, stirring 3 minutes

Bell can be evenly mixed out, the discharge process is fast, not easy to stir for a long time.

4, a pot of material mixed as far as possible after all the molding, do not mix use.In particular prevent

Buy time longer initial setting state of the material, once mixed into the new material, will soon cause the new material to promote the setting.

5, the occurrence of coagulant castable must not be used (no flow, the vibration bar is a

A hole).If you add more water to the coagulant, there is still no fluidity. It is wrong to add water to continue to use. It is useless.

6. After the pouring material is put into the template, it can be rapidly flattened according to the fabric conditions, and it is not easy to accumulate too much and take too long.

The same thing is to finish construction as quickly as possible.

7, if you pay attention to the above problems, but also promote coagulation phenomenon, should contact the supplier, pouring

Adding retarder in the injection material can effectively control the problem of too fast solidification speed of castable.