CNC Keyboard,CNC Machining Aluminum Keyboard,Aluminum cnc machining parts keyboard,custom keyboard case metal cnc machining Dongguan Shangen Precision Metal Plate Co., Ltd. , https://www.shangenmetal.comCement Mortar Coated Steel Pipe
Cement mortar coated steel pipes are designed to provide both structural integrity and corrosion resistance. These pipes are filled with a layer of cement mortar, which has excellent thermal insulation properties. When exposed to fire, the mortar absorbs a significant amount of heat, leading to an uneven temperature distribution across the pipe's cross-section. This uneven heating helps delay the rise in temperature of the steel structure, increasing its fire resistance time and slowing down the rate at which the steel heats up. Once the steel begins to yield, the surrounding cement mortar can take on most of the axial load, preventing structural collapse. Additionally, this coating also improves the fire resistance of composite beams by reducing the temperature of the steel through heat transfer from the top flange to the concrete.
Experimental data shows that using cement mortar coatings can reduce the need for traditional fireproofing materials by as much as one-third to two-thirds, especially when meeting a 3-hour fire resistance requirement. This not only saves costs but also enhances the overall safety and durability of the structure.
The strength grades of cement mortar used for anti-corrosion applications include M3, M5, M7.5, M10, M12.5, M15, M20, M25, M30, and M40. Depending on the intended use, the mortar is categorized into masonry, plastering, and jointing, regardless of its grade. After the application of cement mortar, it is essential to let it air dry naturally for 2-3 days. This step is crucial to prevent cracking caused by impacts during transportation or installation.
Steel components are still influenced by external forces, which can affect their deformation, stability, and fatigue resistance. Hot-rolled steel products may have dimensional variations due to thermal expansion and contraction. Even if the dimensions are within specifications at the time of rolling, they may shrink slightly after cooling. The greater the negative deviation in width and thickness, the more pronounced these effects become. As a result, for large steel sections, precise control over edge width, thickness, length, angles, and edges is difficult to achieve.
Internal anti-corrosion methods for cement mortar coated steel pipes include:
Cement mortar coated steel pipes are widely used in various industries. In municipal engineering, they are suitable for high-rise building water supply systems, heating networks, tap water projects, gas transmission, and underground water pipelines. In the petroleum industry, they are ideal for transporting corrosive media in pipelines, chemical, pharmaceutical, and textile applications. For sewage treatment, they are used in discharge pipes, sewer lines, and anti-corrosion works in biological pools. In agriculture, these pipes offer superior corrosion resistance compared to conventional steel structures, enhancing both fire resistance and fire protection capabilities.