Chapter 1816： I'm stupid, really ...

You should know that in the later generations, asbestos brake pads are also a very common commodity, and have not been banned by the state. Of course, the harm is definitely there. 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 point that later generations have not banned it, there are hazards, but they have not reached a certain level. Otherwise, it is already banned.

Therefore, Marin will not ban the application of asbestos fiber in the production of cement board. After all, he didn't have glass fiber to replace asbestos fiber. The most important thing is-cost ...

In fact, the state-owned glass artisans in Beihai are not incapable of drawing glass. However, the fibers of this pure glass are very brittle, easily broken, and of little practical value. Marin remembers that later generations of glass fiber seem to add a lot of other substances. Unfortunately, he is not a relevant professional and does not know how to get it.

Therefore, from cost considerations and technical considerations, using asbestos fibers to make high-quality cement slabs is indeed a good choice.

As for the hidden danger of dust inhalation during the production process, Marin decided to promote wearing masks in the workshop to reduce the chance of asbestos dust being inhaled into the lungs by workers. In addition, Marin placed an order with the Crimean Khanate and ordered thousands of Mao Gonggong for the production of asbestos fiber cement boards. In this way, the harm of asbestos to its people is greatly reduced. As for the life and death of Grandfather Mao ... It ’s good to wear them with masks, not to mention anything else ... from the moment they were captured by the Crimean robbers, they had no hope ...

In fact, under the stimulus of heavy awards, the craftsmen's enthusiasm for invention is soaring. No, Kaul ’s colleague Katz craftsman proposed the concept of plant-fiber concrete.

After testing, Katz proposed the theory that flax fiber and sisal fiber can also be filled into the cement board as "ribs and bones", which increases the strength of the cement board.

For his point of view, Marin also strongly agreed. However, he is not willing to put it into application. Why? The cost is high!

If it is the most common flax fiber, it has poor corrosion resistance and insufficient service life. And to enhance the performance and life of flax fiber, the best way is to soak flax fiber with tung oil, so that flax fiber like the old rattan used by rattan brand, toughness and life will become longer. However, this cost is a bit higher ...

As for the sisal fiber concrete ... this thing has also been studied in later generations, it is a good variety. But one question-high cost ...

The quality of sisal fiber is indeed very good, and its corrosion resistance and tensile strength are much stronger than flax fiber. But the problem is that the sisal fiber in the North Sea country is scarce, and it is not enough to make sails and ropes. How can there be excess for making cement board?

Therefore, despite being a good idea, Marin cannot be used. , Without him, cost ...

After all, it is a common material used for paving roads, and the cost cannot be expensive. Otherwise, if the road is long, 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 soaked with tung oil. After all, Marin also worried about his family's health problems. Although the asbestos fiber cement board is actually not dangerous, Marin dared not risk his family's health. It would be fine if the asbestos fiber cement board was used to lay the road outdoors, but indoors, try to use it as much as possible.

In fact, even outdoor paving does not necessarily require full use of asbestos cement board. After all, asbestos is not expensive, but it is not cheap because of its large quantity.

Therefore, it is the same as the principle set by Marin before-asbestos cement slabs are used on the main roads, and ordinary roads are used, and ordinary grade cement slabs without asbestos fibers are used, and the thickness reduction type will be used to save materials. In this way, a lot of money can also be saved. At the same time, lest asbestos fibers are not enough.

But after going to church on Sunday morning (pretending to look like), Marin suddenly discovered that it looks like plant fiber, and there is thatch ...

When he came back from the church, he passed by the slums and found those adobe houses, and suddenly remembered-isn't the adobe house the simplest concrete structure?

In order to make the soil wall firmer, when building the adobe wall, the soil wall is often doped with thatch as a "entrapment" to enhance the tensile strength of the soil wall and make it not easy to collapse.

In the same way, using thatch with good toughness as a "ribbon", mixed into cement, also has a certain tensile capacity. At least, it is better than simple cement board.

So, Marin asked the cement board factory to carry out the test, and it turned out that the cement board with straw reinforced concrete was still effective. Although it is far inferior to reinforced concrete, it is not as good as bamboo reinforced concrete. However, it is always stronger than cement alone. Marin knew in his heart that the concrete made of thatched tendons was average in terms of quality and longevity. However, it is compared with steel and bamboo reinforced concrete. If it is only used for paving roads, thatched concrete can barely be used.

After all, there was no such thing as a heavy truck ruin in this era. Usually a carriage, with a load of one or two tons, reaches its limit. At this level of pressure, straw reinforced concrete is still competent.

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

The bamboo tendon is almost, not very resistant to corrosion. However, according to the experience of the previous life, there is no problem with bamboo-reinforced concrete for 20 to 30 years.

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

The most important thing is that thatch is cheap! Thatch is cheap! Thatch is cheap! (I say the important thing three times)

In this era of extremely low productivity, cost is everything. Marin chose asbestos fiber which is harmful to health ~ www.novelhall.com ~ as the concrete bone, also because the cost of asbestos is not high. At least, the cost is much lower than sisal fiber or oil-blended flax fiber.

But no matter what the comparison, there is nothing lower than the cost of thatch everywhere. Moreover, the grass is not something that animals like to eat. Marin is currently pushing for plowing the grasslands all over the country, and then replacing wild grasses such as thatch with alfalfa and ryegrass. Now, what he lacks most is the weeds like thatch.

Moreover, for the laying of ordinary roads, the straw reinforced concrete made of thatch is absolutely sufficient. You should know that in later generations, some cities are still renovating roads every year, and the big Lanxiang excavator graduates are not enough. Because, breaking the old concrete road requires the breaker of the excavator. After all, reinforced concrete is more common in later generations.

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

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

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

"I'm so stupid, really ..." Marin repeated several times, and was about to become Xianglin's sister ...