Can anti-corrosion sleepers be used in alpine areas?

Conclusion: usable.

But make it clear - corrosion resistant sleepers are not a universal material that can be carried in any environment. It can be used, relying on the actual process, not the meta.

Why Pine Wood?

Pine wood is the mainstream choice in the field of anti-corrosion treatment in China, because the material is relatively stable, the processing performance is good and the cost is controllable. These three points together are the most preferred in engineering.

Natural wood is really afraid of water and moisture, but anti-corrosion treatment is to solve this problem. Many people have a prejudice to wood - think it is "delicate", the wind and the sun will crack. That's half right. This is true for untreated wood, but the properties of treated pine wood are no longer the same as those of common wood.

Instead, the structural features of the pine itself become an advantage. Its conduits are evenly distributed, which means that the preservative oil is relatively uniform when penetrating, and the situation of "one side is saturated and the other side is dry" will not occur. This is stronger than most hardwood.

Key to immersion depth

Qualified anti-corrosive sleepers with oil immersion depth over 13mm. This figure is not arbitrary - it means that the protective component actually penetrates the interior of the wood, rather than just applying a layer to the surface.

What is the concept of 13mm? You take a vernier caliper to measure, which is almost one and a half times the diameter of an ordinary pencil. The depth of this layer is sufficient to resist daily moisture infiltration and freeze-thaw cycles.

In order to save oil, some small factories shorten the oil immersion time, and the depth is only 5 to 8 mm. It seems OK after laying this kind of sleeper. After half a year, the surface begins to be whitened and cracked, and the wood inside is still the original wood - equivalent to white wood. Therefore, when buying sleepers, do not just ask the price, but directly test the report to see whether the immersion depth column meets the standard.

What is the test of alpine regions?

Many people think the alpine region is "cold". In fact, what really matters is repeated temperature difference.

In the daytime, it is minus ten degrees, and the snow is on it; At night, the temperature rises a little, and the snow melts and penetrates into the wood; Re-freeze the next day. This "freeze-thaw-freeze" cycle is more damaging to the material than simple low temperatures.

Why? Because the volume of water frozen will expand by about 9%. If the water enters the micropores inside the wood, it freezes like a myriad of small hammers inside and out, and the wood begins to disintegrate from the inside several times. This is known as "frost heave failure".

The preservative treated pine withstands this cycle. The pores inside the oil-immersed wood are filled with preservative, so the moisture cannot enter, which naturally reduces the possibility of frost heaving damage. The deeper the oil is immersed, the greater the protection range, and the longer the service life of the sleeper is guaranteed.

It should also be mentioned that the ultraviolet is not weak in alpine regions. At high altitudes, the solar radiation is stronger and the wood surface is prone to aging and chalking. Fortunately, most of the agents used for anti-corrosion treatment have the ability of ultraviolet protection at the same time. Although the surface layer will slowly ash, it will not affect the strength of the internal structure.

What should be noted in practical applications?

Material selection shall be correct. Not all products marked with "Anti-corrosion Sleeper" meet the standard, and the oil immersion depth can refer to the test report. Don't listen to the sales saying "we have good quality", and the data on paper is the hard truth.

Anti-corrosion sleepers are used in high and cold areas, with little problem. The premise is that you have bought a qualified product with qualified oil immersion depth, and properly drained during construction.

Don't listen to too much hype and see what the inspection report does.