Cement, to a certain extent, almost all modern buildings cannot do without it. It can even be described as the foundation of the building.

Originally, Shi Yiwen did not worry about cement because of the hundreds of tons of cement on the space construction site, but now that the cement is used up, there is only one way left - manufacturing.

If we use the industrial standards of the 21st century, manufacturing cement requires a lot of specialized mechanization - crushers, rotary kiln ball mills, etc. With the current capabilities of iron factories, it is obvious that such large equipment cannot be manufactured.

If there is no condition to create conditions and foreign laws cannot be used, then the local laws are.

Thanks to the large number of old books in the library - actually the electronic version of old books from old magazines, Shi Yiwen easily found the process of producing cement by civilized methods.

Originally, he thought that firing cement was a very complicated process, but in the 1958 "Building Materials Industry", he found a brick and tile factory in Xi'an using local clay and nearby chalk anthracite and gypsum as raw materials, and calcined it in the earth kiln of burning blue bricks to produce the No. 150200 cement process.

Its process is very simple. The mix ratio of raw materials is also very simple. It is 100 kilograms of chalk soil, 8 kilograms of red clay, 15 kilograms of anthracite, and the amount of gypsum is 3. First, the three raw materials of chalk soil, red clay and anthracite are ground into fine powder, add 33 water, mix into mud, and then knead into 7 cm balls. After drying, it is loaded into a crypt of burning blue bricks to fire. The calcination temperature of 600-800 degrees Celsius is enough. There is no need to use a brick cellar to burn refractory bricks to produce. The firing temperature of the wheel cellar to burn red bricks is below 1200c. The temperature in the general firing system is up to about 1100c. The sintering temperature of the red bricks is 1000c. In fact, this is also the temperature limit of the clay bricks. The wheel cellar is built with clay bricks, and the clay bricks will melt at 1400c, and the 1450c required for firing silicate cement.

However, in order to increase the life of the wheel cellar, the internal cellar will still be built with refractory bricks, just like the wheel cellar being built, the cellar is built with refractory bricks, because the iron furnace and other places in the iron factory always need refractory bricks. In fact, there is a small brick cellar in the iron factory, which specializes in the production of refractory bricks. If you want to produce high-grade cement, you really need to use the vertical cellar with refractory bricks. But it is not necessary at present.

But for Shi Yiwen, what he pursues is enough. Just like the mill needed to grind clinker balls is a hydraulic ball mill. The mill ball is a cast iron ball, and only the body is formed with cooked iron rivets. It can be filled with a thousand kilograms at a time, and it only takes a few hours to grind the required fine powder.

In fact, iron factories have long been familiar with the manufacturing of ball mills. After all, potassium sulfur nitrate for the production of gunpowder needs to be ground into fine powder, but wooden balls are used there. Now you only need to learn from the following principles.

However, in just a few days, when the red chimney of the bricks of the wheel kiln factory was spewing out of the air, a few hours later, tons of cement balls were transferred out of the cellar. After cooling, the balls were sent to the ball mill, and 3 white lime was mixed with. After milling for several hours, thousands of kilograms of cement were poured out.

After sieving 180 mesh fine sieve, Shi Yiwen immediately instructed Xu Guangqi to mix the cement with water, and in full view of everyone, the masoners used it to build a wall.

Same as the cement we used before!

Sun Mingan seemed very excited. He had always been very curious about cement and had never known how it was made, but he never thought it was produced in a brick cellar.

As for those bricklayers who have been doing bricklayers for their whole life, they were even more stunned. Although they were originally curious about the cement, after all, the things passed down by our ancestors were to use soil, lime, water and build walls and houses together. As for those who were high-ranking officials and nobles, they were just mud with rice juice. But here they were cement that solidified and solidified like stones. What was even more unbelievable was that the cement was actually burned in the cellar and ground into powder and turned into mud.

This is too incredible!

Compared to the surprise of others, Shi Yiwen stared at the newly built wall of cement and said to himself.

It should be almost equivalent to cement above 200

According to the information, if the cellar temperature is raised to 1300 degrees, the cement produced can reach 300.

Guangqi, do you remember how the tensile test mentioned in the book was carried out? There is also flexural test. Look, let’s work with Yumin and others to make some equipment in the factory and then test these cements. In the future, we can continue to improve the process and improve the quality of cement.

Following the teacher's instructions, Xu Guangqi naturally devoted himself to the new experiments enthusiastically. As for Yumin, he was a teenager in the village. The young people often played together, so he naturally taught them the knowledge of mathematics, physics, chemistry, etc., and gradually became a study group of more than a dozen people. Shi Yiwen was naturally happy to see this, and even encouraged Xu Guangqi to teach mathematics in the village.

Of course they will be encouraged to conduct tests now, and these cements also need to be tested. Although the test has not been conducted yet, after the cement is dry, it is proved that this kind of fired earth cement can be used to build water diversion channels, and may not be used to build concrete buildings, but it is most suitable as a binder for building materials.

With bricks and cement, the construction that was originally suspended began again with great enthusiasm.

Spring goes and summer comes. When the weather gets hotter day by day, the first turbine was finally installed in the turbine workshop by the river. Almost as soon as it was put into use, everyone was shocked by its strong power, and even Shi Yiwen himself was shocked.

Almost twenty horsepower!

Talking to himself, Shi Yiwen saw that the extruder that was originally slowly extruded bricks quickly extruded bricks, and the speed increased by no less than ten times. Not to mention the craftsmen of this era, even for Shi Yiwen, the speed of making bricks is hard to imagine. The increase in power has greatly improved the production efficiency. However, the only thing that restricts the efficiency of brick making is probably dependent on how much clay the brick factory can mine. As long as the clay can supply, this wheel cellar brick factory can produce tens of millions of bricks every year.
Chapter completed!