First, the advantages of cement mortar lining anticorrosion steel pipe
1, because there is concrete in the steel pipe, it can absorb a lot of heat energy, so the temperature distribution of the steel pipe section is uneven when it is fired, which increases the fire resistance time of the steel pipe and slows down the temperature rise of the steel pipe. Once the steel pipe yields, cement soil can bear most of the load and prevent the structure from collapsing.
2. Experiments show that cement mortar anticorrosive steel pipe can save 1/3-2/3 or even more fire retardant coatings than steel pipe, and with the increase of steel pipe diameter, the more coatings can be saved.
3. Cement mortar, as the raw material of anti-corrosion steel pipe lined with cement mortar, is widely used. In building engineering, it can be used for foundation and wall masonry, and as an adhesive for block masonry materials, such as rubble and red bricks. The second is for indoor and outdoor plastering.
4, cement mortar in use, also often mixed with some additives such as micro foaming agent, waterproof powder, etc. To improve its machinability and consistency. Concrete is made by adding stones into cement mortar in proportion.
Second, the anti-corrosion technology of welded steel pipe lined with cement mortar
1. Concrete-filled steel tubular column has the properties of both steel tube and concrete due to its structural characteristics. Because of the isolation of the lining coating, the water body does not contact with the metal pipeline, which ensures the water quality.
2. The fundamental reason is that the steel pipeline is in a thermodynamic unstable state. Under the above conditions, they will return to the original relatively stable state and generate iron oxide carbonate. Or converted into soluble ions.
3. The cement mortar lining relies on its own binding force and the support of the pipe wall, and its structure is uniform and dense, hard and firm. If epoxy resin is coated on the surface of mortar, the roughness coefficient can be further reduced. Therefore, the country has also formulated the specifications and quality standards for cement mortar lining.
4. There are spiral steel pipes and fittings with poor anti-corrosion quality, and this part of the water supply pipeline has serious scaling, which is easy to make the water quality yellow; A few spiral steel pipes have too large diameter, small pressure difference and slow flow rate, which makes the water age in the pipes longer, the residual chlorine decreases, and the water quality becomes worse due to local manual obstruction. Cement mortar is used to prevent corrosion and perforation on the inner wall of the pipeline and prolong the service life of the pipeline.
5. The inner wall of anticorrosive steel pipe in cement mortar is isolated from water or air, forming a dense protective layer, thus inhibiting the oxidation, corrosion and scaling of the inner wall of steel pipe. Compared with other anticorrosive coatings, cement mortar has strong adhesion to the inner wall of steel pipe, because the gel formed by hydration of cement particles has adhesion to the inner wall of steel pipe.
In the above article, I told you the advantages of anti-corrosion steel pipe lined with cement mortar and the related contents of anti-corrosion technology of welded steel pipe lined with cement mortar. I believe you must know something about these, and I hope these can help you.