Yushan Workshop.

After determining the new overall plan of Yushan Town, Liu Juntao asked Tang Yu to allocate money and grain, and now a new workshop is built on the side of the Yushan Workshop, which is next to the glazed workshop at the foot of Yushan (Liu Juntao renamed Yushan), at an interval of three miles.

After that, Tang Yu seized the time to recruit craftsmen, allocate money and grain, and prepare to build a new workshop here.

Due to the perennial construction of Yushan Town, so that the surrounding craftsmen have become accustomed to it, as soon as they heard the news that Yushan Town was going to be built, they did not have to wait for the Ministry of Commerce to post the news, and they rushed over like crossing the river.

After only more than half a month, the new workshop was roughly formed and had a rough appearance.

Liu Juntao took Tang Yu and Ma Lijun to the new workshop that was stepping up construction, and said to the two: "The new material I mentioned before is called cement!" ”

"Cement?"

Tang Yu and Ma Lijun were stunned when they heard this, mud is mud, water is water, what is this cement?

Looking at Tang Yu and Ma Lijun's expressions, Liu Juntao couldn't help but smile.

In fact, the production method of soil cement is not difficult, but at this time, under the process level of Daming, it is difficult to produce soil cement on a large scale and industrially.

Therefore, Liu Juntao can only try it out in this new workshop like the first steelmaking before, solve the problem of whether there is or not, and then talk about the problem of output:

The main material of soil cement is mainly composed of limestone, clay and iron powder in a certain proportion, and then finely ground into powdery raw meal, and then continuously heated in the furnace cellar to finally become a usable clinker.

Although the process is simple, the minimum temperature required for this production method is about 1,300 degrees, so the kiln for making cement must be built with refractory bricks like a steel-making furnace.

Although Liu Juntao is not a professional in cement manufacturing, due to the reasons of his major, he is also very clear about the local cement production methods in the rural areas of later generations.

The raw materials of soil cement are very simple, clay bricks, various clay fragments, various ceramic dish fragments, and various refractory materials, such as cylinders, basins and other fragments, water quenching slag (the waste slag in the ironmaking furnace is directly put into the cold water pool for quenching), slag ash (all kinds of residue after coal burning) can be, and then add quicklime, all ground into fine powder and mixed together to be cement.

If you want to use it better, you can also add plaster. The production method of plaster is also very simple, that is, a small amount of gypsum ore is used to grind fine, heated with an iron pot, as long as 100 or dozens of degrees, the gypsum ore powder is fried to yellow-gray color, and it is added to the cement powder, which can be used to mediate the solidification of cement.

As for these accessories, they can be hammered with a hammer first, and then ground with a stone mill, it is better if there is a water-powered mill, but you can refer to the lathe of the War Bureau, and use an animal-powered stone mill.

Then the above various finely ground materials are mixed together in proportion, which is cement, also known as mixed cement, or soil cement.

This kind of cement has good acid and alkali corrosion resistance, low early strength, but if it is heated by high temperature or steam, the strength will grow very quickly, and the water absorption is strong when used, and the heat release is low, if it is used ordinarily, it takes nearly two months to reach the strength of industrial cement in later generations. Moreover, the frost resistance of soil cement is not as good as the ordinary cement of later generations, if it will take a period of curing period in winter, it is the ordinary maintenance of the plastic sheet covering in later generations, do not make the temperature too low.

However, at this time, this kind of soil cement can fully meet the needs. In addition, in the future, the cement workshop will continue to develop and create according to the actual situation of use.

Liu Juntao is very confident and sure of the scientific and technological power of the Chinese people, if it were not for the interference of the two barbaric and backward Tatars of the Mengyuan and Manchu Qing dynasties, the local science and technology of China could develop on its own, and become an existence that can compete with Western science and technology, or even crush it!

Liu Juntao knows this kind of soil cement manufacturing method, can waste bricks, waste clay, waste porcelain, waste slag, waste iron powder and other waste that was discarded in the past, the cost is very low, and the raw materials are very sufficient, can be mass-produced this kind of soil cement!

So, Liu Juntao wrote down the production method of soil cement, handed it to Ma Lijun, and instructed: "This secret recipe must be kept closely and must not be known to a third person!" ”

Ma Lijun was very excited when he took it and said: "Don't worry, I will definitely live up to Mr. Lian's expectations!" ”

Of course, Liu Juntao believed it, so he instructed some details: "If the number of broken bricks and broken porcelain pieces is not enough, build a few more brick kilns to burn bricks for use!" ”

"Those craftsmen in the cement workshop will also be strictly guarded in the future, just like the glaze workshop and the liquor workshop! Let Chang Hongdao assign manpower to strictly manage here! ”

Ma Lijun listened very carefully and wrote down Liu Juntao's instructions one by one, for fear of missing something.

"Also, the treatment of craftsmen in this cement workshop, just like the glaze workshop and the liquor workshop, should adopt incentives to pay attention to quality while ensuring output!"

Liu Juntao said in a deep voice: "Those who are indiscriminate, those who leak information, and those who are passive saboteurs, Chang Hongdao will lead people to check clearly, and they will be taken away and executed directly, and they will not be tolerated!" ”

Tang Yu and Ma Lijun were also shocked when they heard this, Liu Juntao usually spoke softly with everyone, talked and laughed, but once he got down to business, he became decisive as if he was a different person!

At this time, Liu Juntao's solemn face, coupled with the words just said, made Ma Lijun's heart cold, and he said secretly: "Mr. Lian is really a bodhisattva's heart and a vajra method!" ”

"Rest assured, I will strictly manage, will never let the indiscriminate filling, leakage of news, negative slacking happen, once found out that someone is impatient, I will also immediately notify the general manager, will never delay things!"

"Hmm!"

Liu Juntao nodded with satisfaction and said, "That's the best!" ”

At this time, Tang Yu raised a question: "Mr. Lian, among the materials you mentioned just now, everything else is okay, but this lime is a rare thing, even if it is purchased from the market, it will cost a lot of silver, how can this be good?" ”

Liu Juntao was also slightly stunned when he heard this, and then remembered something, and said with a smile: "What's so difficult about this? ”

"I want to hear about it!"

Liu Juntao said with a smile: "The Ministry of Commerce can buy shells, oysters and other things from coastal states and counties, these things are waste that fishermen don't want, and no one will ask for them for nothing, even if they buy them in large quantities, the price will not be high." ”

Tang Yu asked strangely, "Mr. Lian, what's the use of buying these things?" ”

"Don't underestimate these shells and oysters, you can burn lime by burning these shells, but the production is not very large. The workshop can directly build a special lime kiln to burn the shells of shells and oysters, even if the output is small, it can't hold the large number of shells, and at the same time solve some food. ”

After Tang Yu and Ma Lijun listened, they once again sighed that Liu Juntao was well-read and well-informed, and they admired it very much in their hearts.

Tang Yu said directly: "Mr. Lian, I will arrange for someone to go to Dengzhou Mansion and Qingzhou Mansion in a while to vigorously purchase shells and oysters!" ”

At this time, Ma Lijun asked: "Mr. Lian, the liquor produced by our workshop is called Liu's Erguotou, and the glaze produced is called Yushan glaze, so what is the name of this cement?" ”

Liu Juntao pondered for a while and said: "We are all people of the Ming Dynasty, so this cement is called Huangming brand cement!" ”