You must know that in later generations, asbestos brake pads are also a very common commodity, and they have not been banned by the state. Of course, there are certainly harms. Because, when the car brakes, it does produce some dust due to the friction between the brake pads and the wheels. However, judging from the fact that the country did not ban it in later generations, the harm is there, but it has not yet reached a certain level. Otherwise, it will be banned early.

Therefore, Marin will not prohibit the use of asbestos fibers in the production of cement boards. After all, he didn't have a glass fiber alternative to asbestos fiber. The most important thing is - the cost......

In fact, the state-owned glass craftsmen in Beihai are not unable to draw glass. However, the fiber of this pure glass is very brittle, easy to break, and has no practical value. Marin remembers that in later generations, it seemed that many other substances were added to the fiberglass. It's a pity that he is not a relevant professional and does not know how to get it.

Therefore, from the cost consideration, from the technical consideration, the use of asbestos fiber to make high-quality cement board bricks is indeed a good choice.

As for the problem of dust inhalation in the production process, Marin decided to promote the wearing of masks in the workshop to reduce the chance of asbestos dust being inhaled into the lungs by workers as much as possible. In addition, Marin placed another order for the Crimean Khanate for several thousand Mao father-in-law for the production of asbestos fiber cement boards. In this way, the harm of asbestos to the people of the country is greatly reduced. As for the life and death of Grandpa Mao...... It's nice to have a mask on them, but nothing else...... From the moment they were captured by the robbers of the Crimea, there was no hope for them......

In fact, stimulated by heavy prizes, the enthusiasm of craftsmen for invention is high. No, Kaul's colleague Katz craftsmen, came up with the concept of plant fiber reinforced concrete.

After experiments, Katz proposed the theory that flax fibers and sisal fibers can also be filled into the cement board as "bones" to increase the strength of the cement board.

Marin also strongly agrees with his views. However, they are reluctant to put it into use. Why? The cost is high!

If it is the most common flax fiber, the corrosion resistance is not good and the service life is insufficient. The best way to enhance the performance and longevity of flax fiber is to soak it in tung oil, so that the flax fiber will be as tough and longevity as the old rattan used in rattan branding. However, this is a bit more expensive......

As for sisal fiber reinforced concrete...... This thing has also been studied in later generations, and it is a good breed. But the problem is the same - the cost is high......

Sisal fibres are indeed of good quality, much more resistant to rot and tensile than flax fibres. But the problem is that at present, there is a shortage of sisal fiber in Beihai, and it is not enough to make sails and cables, so how can there be any surplus to make cement boards?

So, despite being a good idea, Marin couldn't use it. , without him, the cost problem......

After all, it is an ordinary material used to pave roads, and the cost cannot be expensive. Otherwise, the road is paved long and it will go bankrupt. Therefore, for the most common paving materials, cost is also a very important issue.

However, for the floor tiles in the palace, it seems that you can try sisal fiber concrete, or flax fiber cement board made of flax fiber reinforced by soaking in tung oil. After all, Marin is also worried about his family's health. Although the asbestos fiber cement board is actually not dangerous, Marin does not dare to risk his family's health. If you use asbestos fiber cement board to pave outdoor roads, it's nothing, but indoors, you can not use it or try not to use it.

In fact, even if it is an outdoor paving, it is not necessarily necessary to use all asbestos cement boards. After all, although asbestos is not expensive, it is not cheap if it is large.

Therefore, the principle is the same as that set by Marin before - asbestos cement board is used on the main road, and ordinary cement board without adding asbestos fiber is used for ordinary side roads, and the thickness reduction type will be used to save materials. In this way, you can also save a lot of money. At the same time, lest the asbestos fibers are insufficient.

But after going to church on Sunday morning (pretending), Marin suddenly realized that there was an option for thatch in the plant fibers......

When he came back from the church, he passed by the slums and found those adobe houses, and suddenly remembered that adobe houses were not the simplest concrete structures.

In order to make the adobe wall stronger, when the adobe wall is built, the thatch is often mixed with the earthen wall as a "confinement" to enhance the tensile ability of the earthen wall and make it not easy to collapse.

In the same way, the thatch with good toughness is mixed into the cement as a "muscle", which also has a certain tensile ability. At least, it's better than a simple cement slab.

So, Marin asked the cement board factory to conduct an experiment, and sure enough, he got a cement slab of straw reinforced concrete with a makeshift effect. Although it is far from being comparable with reinforced concrete, it is not as good as bamboo-reinforced concrete. However, it is a little stronger than cement alone. Marin knew in his heart that this kind of concrete made of thatched bones was very average in terms of quality and life. However, that is compared to reinforced steel and bamboo-reinforced concrete. If it is only used for paving, the thatched concrete is actually barely usable.

After all, there is no such road-destroying thing as heavy trucks in this era. Usually horse-drawn carriages, carrying a ton or two, reach the limit. And at this level of pressure, straw reinforced concrete is still competent.

Moreover, concrete is mainly alkaline and has a certain corrosive ability. The reason why reinforced concrete is not afraid of corrosion is that steel is not afraid of alkaline environment, and can even generate alkaline protective film on the surface of steel bars to improve the corrosion resistance of reinforced concrete.

And the bamboo tendons are almost and not very corrosion-resistant. However, according to the experience of the previous life, there is no problem with bamboo reinforced concrete for twenty or thirty years.

The thatch is much more alkali resistant than the column, although the strength is not as good, but in terms of service life, it may be stronger than the bamboo reinforced concrete.

The most important thing is that thatch is cheap! Thatch is cheap! Thatch is cheap! (Important things are said three times)

In this age of extremely low productivity, cost is everything. Marlin chose asbestos fibers, which are harmful to health, as concrete bones, also because the cost of asbestos is not high. At the very least, the cost is much lower than sisal or oil-soaked flax fiber.

But no matter how you compare, nothing is cheaper than the ubiquitous thatch. Moreover, animals don't like to eat thatch. Marin is now pushing to plow all the country's meadows and replace thatch and other weeds with alfalfa and ryegrass. Nowadays, the last thing he lacks is thatch.

Moreover, for the paving of ordinary roads, the life span of straw reinforced concrete made of thatch is absolutely sufficient. You must know that in later generations, some cities are still renovating roads every year, and the excavator graduates of Dalanxiang are not enough. Because, smashing through the old cement pavement requires the crushing hammer of the excavator. After all, reinforced concrete was more common in later generations.

Even if the life of straw reinforced concrete is only a few years or more than ten years, it is enough, as long as it is not replaced every year, this cost can be afforded.

"I'm so stupid, really!" Marin muttered to himself.

"Why didn't I think of cheap straw reinforced concrete sooner?"

"I'm so stupid, I really ......" Ma Lin repeated several times, and he was about to become Xianglin's sister-in-law......