Lightweight castables play the role of thermal insulation. If used in pipelines, the density should generally not be less than 1.2 kg/m3. The proportion of 1.5 is more common. However, when used in pipelines, due to the limitation of the diameter of the pipeline, the construction will be subject to certain restrictions, because it is not easy for construction workers to construct in the pipeline.
. When constructing lightweight castable materials, pay attention to the heat insulation layer.
The first thing to pay attention to is the insulation layer. The pasting of insulation cotton is also a part that is not easy to implement. The pipe insulation in the picture above is extremely irregular, and the anchors are not suitable for use. The anchors must Paint or if not paint put plastic caps on the anchors. Otherwise, it will easily rust and affect the service life.
If this happens, there is a certain way to remedy it, which is to lay a layer of plastic film on the surface of the insulation cotton. After the construction of such lightweight castables, moisture during baking will not easily penetrate into the insulation cotton. If moisture penetrates into the insulation cotton, even if it is used after drying, the effect of the insulation cotton will be shortened.
2. Pay attention to the proportion added during construction
Another thing to note: When constructing lightweight materials, you must pay attention to the proportion of adding them, because too little water is added to lightweight castables. Some of the raw materials in the matrix are too light to be constructed and are not easy to condense. If you add too much water, it will affect the strength of later use.
3. Aggregates and powder must be mixed first during construction.
Therefore, during on-site construction, the aggregate and powder must be mixed first, then the binder is added, and then the lightweight castable is added and stirred in strict accordance with the water addition ratio given by the manufacturer. After mixing, check that the fluidity is intact before proceeding with vibrating construction. Under normal circumstances, the amount of water added to lightweight castables is 15-17%. Some manufacturers will also sprinkle some water to facilitate production control due to the light weight of lightweight insu拉通castables during production.
