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Castable material, ramming material and other amorphous material construction points

Words:[Big][Medium][Small] Mobile Page Two-Dimensional Code 2018-06-10     

Construction of refractory castable

1. Prepare

Before construction, check the intact and clean condition of mixing equipment, transportation tools, vibrating tools and pouring parts to be poured.Check the water loss prevention measures of formwork, surrounding firebricks and heat insulation layer;Inspect the rust removal, anchoring parts, anchoring brick form, size, arrangement, welding quality and expansion compensation measures of metal anchoring parts;Check whether the quality of castable and construction water meet the requirements.In addition, during the construction of pouring materials, to ensure that there is no power failure, no interruption of construction.

Among them, the pouring material construction template is made of non-absorbent material.If want to brush waterproof coating with woodiness formwork, in case pouring makings loses water.After the loss of water, the fluidity of the castable decreases, and it is difficult to remove bubbles and vibrate.Steel formwork shall be coated with release agent to prevent adhesion between formwork and castable.When using repeatedly, template should be cleaned first, brush oil later, reapply.

Stir 2.

(1) should use a forced mixer to mix.The mixer shall be cleaned in advance and rinsed with water. Lime, sand, Portland cement and other sundries shall not be mixed in.If phosphate bound amorphous materials are stirred, the equipment must be thoroughly cleaned before it can be used for mixing cement bound castable.

(2) according to the size of the mixer and the construction of quantitative, each mixing volume should not exceed 200kg.Under specified water consumption, the mixing castable must be sufficiently fluidity.

(3) pour the pouring material into the blender, dry mix for 3 minutes, and then add clean tap water.When adding water, 90% of the reference added water amount of castable shall be added first, and then the remaining water shall be added slowly to make the slurry's fluidity meet the requirements, and the wet mixing time shall not be less than 5min.

4. The pouring material must be used by the whole drum and bag.The stirring castable shall be poured rapidly, and must be used up within 30 minutes from the time of adding water.Wet materials that have been initially coagulated shall not be forced to take shape, and shall not be added with water for repeated use, but must be discarded.

3. The vibration

(1) model to be strict, strictly prevent leakage of pulp.Pour into the mold frame of the pouring material should be as soon as possible with the vibration bar layer vibration, the thickness of each layer should not exceed 300mm, the vibration interval of about 250mm is appropriate.Do not repeat the vibration of the parts that are already solid to avoid segregation.

(2) vibration, to avoid touching the anchor, do not damage the insulation layer, until the pouring material surface pulp, most of the bubbles out after the vibration bar slowly.

(3) pouring should be carried out continuously.Before the initial setting of the former layer of castable, the construction of the latter layer of castable should be carried out in time.If the construction interval exceeds the initial setting time, the construction joints shall be treated according to the requirements.

4. Maintenance

(1) cement binding castable, wait for the surface of castable dry, immediately use plastic or straw bags will be exposed in the air part of the cover.However, the chemically bonded castable does not have to cover the surface.

(2) after the final set, the pouring material template can be removed.But the load bearing plate can only be removed after the strength reaches 70%.

(3) refractory castable curing temperature should be between 10 ~ 35℃.If the temperature is too high, the hydration products will turn into C3AH6, which may lead to the decrease of strength.If the temperature is too low, the hardening is delayed.

5. Special construction

Hot days construction, pouring material to be stored in advance in a cool place, construction should be arranged as far as possible in the early, late, water temperature, material temperature should be controlled in 30℃ below.After pouring, timely cover and frequently sprinkler cooling.

During winter construction, castable materials should be stored in a heated room in advance and mixed with hot water. The mixing temperature should be kept above 10℃ and the lining temperature above 5℃.If these conditions cannot be met, the working environment shall be enclosed, windproofed, heated and insulated until it meets the construction requirements.During the hardening and curing period, the castable must not frost.

Second, daub ramming material construction

Before construction, carefully check whether the construction tools such as molds meet the requirements of use, and whether the welding and installation of equipment rust removal, tortoise shell mesh and anchor nails are qualified.All ready, can refer to the following construction methods for construction.

Stir 1.

(1) should use the forced mixer mixing, mixer need to clean up in advance and rinse with water, not mixed with lime, sand, Portland cement and other debris.

(2) according to the size of the mixer and the construction of quantitative, each stirring should not exceed 100kg.

(3) pour the ramming materials into the blender, dry mix for 3 minutes, then add the reference amount of liquid binder, wet mixing time shall not be less than 5 minutes, until the mixing materials can reach the construction level.

(4) the mixture must be used up within 15 minutes.

(5) has the initial coagulation of wet material must be discarded, do not add liquid binder stirring repeated use.

6 construction environment temperature should be between 10 and 30℃.When material temperature and construction site environment temperature are too low or too high, appropriate measures should be taken.

2. Apply or pound

(1) construction with mallet or rubber mallet hit compact.Daub or pound when, should check lining thickness at any time, ask thickness is even, the surface is smooth.Finish with a spatula.Do not brush water, cement or dry cement on the surface.

(2) with the structure of the lining construction, each time fill into the turtle net lining material area should not be too large, should be a fill by hole tamping, make the lining surface and turtle net level.During the construction break, the residual materials in the tortoise shell net of the unconstructed part should be cleaned up.

(3) according to the construction requirements set expansion joints, expansion joints with fire-resistant fiber filling.

3. Maintenance

(1) after the completion of construction, natural maintenance at room temperature 3d, is strictly prohibited to drench water.

(2) the curing environment temperature should try to be above 20℃.When the ambient temperature is lower than 20℃, the curing time should be extended appropriately or other corresponding measures should be taken according to the hardening situation.

4. Bake

(1) should follow the heating curve to bake, avoid rapid heating, or it will produce internal damage or burst.

(2) when the curing temperature is too low, should extend the low temperature baking time and slow down the heating rate.

(3) baking must maintain proper ventilation, easy to remove water.

(4) in the oven process, if there is a drop in temperature, do not speed up to catch up.

Three, kiln baking

In the baking process, the principle of "slow heating, no turning back" should be followed, that is, the principle of slow heating and no cooling, in order to prevent damage to lining and improve lining life.

During the lining period, the kiln body can be rotated from low speed to normal speed, which can not only maintain the uniformity of the surface temperature of the lining, but also avoid the deformation of the kiln body.







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