Two thousand healthy soldiers were recruited, and Li Zhi asked them to report next month. Pen? Interesting? Pavilion wWw. ｂiquge。 infoThis month, Li Zhi wants to hurry up and build a soldier's barracks. Li Zhi was going to let the soldiers have a room for eight people, so he would build two hundred and fifty houses. It takes a lot of construction workers to build so many houses in a month, and Li Zhi has almost all the masons and carpenters in the vicinity of Tianjin.

Knowing that the building Li Zhi was going to build was a soldier's barracks, Tao Youmao, the head of the mason, was very surprised and asked in surprise: "Master Guan, you want to build such a large barracks?" How many soldiers does that have to hold? ”

This Tao Youmao is a thin middle-aged man with two long mustaches on his lips. When he spoke, his two beards shook and shook, which was very funny.

Although it is not a secret how many soldiers are hired, Li Zhi is not willing to let too many people know. At least in the future, when facing Jiannu or rogues, you can't let the enemy know your own details. Glancing at Tao Youmao, Li Zhi said: "You don't have to ask more, just organize people to build it quickly!" ”

Tao Youmao agreed, but sighed again: "The sergeant of the captain is more than the garrison of the state city!" It's messy, it's messy! ”

Li Zhi glared at Tao Youmao and scolded: "You don't want to go out and talk nonsense, if you spread the word, I will definitely cut off your tongue!" ”

Hearing the official's scolding, the craftsman shrank his head and said with a smile: "Official, where can I talk nonsense, I was really surprised, just talk to myself." I definitely don't say anything outside! ”

After thinking about it, that Tao Youmao said again: "Official, you are so bold, raising so many soldiers, you will definitely make great achievements in the future!" Be a thousand households, no, be a general soldier! ”

Li Zhi has experienced a lot of things in the past few months, and he feels that he can't do it without an official at the end of the Ming Dynasty, but he has some expectations for being a big official, so he smiled and replied: "Then I will entrust you with auspicious words!" ”

Tao Youmao looked at Li Zhi's face, and saw that Li Zhi's face was not unhappy, so he asked again: "Why isn't the official's barracks repaired in the city, won't there be no danger to defend when the Tartars come in the future?" ”

Li Zhi smiled and said, "The area north of Zhuangzi will be built into a city in the future." I will build a city with a circumference of 2,000 paces, with walls covered with bricks, and four gates! ”

The craftsman was stunned and muttered: "The official is so bold, the official means to build a city as big as a county seat!" ”

Li Zhi nodded a little proudly and said, "That's right, you will be able to see this new city in a few months!" ”

"It is worthy of the Li family in the east of Tianjin! Build a county town out of thin air! Tao Youmao sighed with emotion, and suddenly became a little anxious, his eyes rolled, and he knelt in front of Li Zhi with a puff, and said flatteringly: "Official, you have to share some of the work of repairing the city wall and covering bricks." More than 200 craftsmen under my command are waiting every day for the job to open and earn food! ”

Li Zhi Zhengse said: "It depends on the quality of the barracks you build, the quality of the barracks is good, and I will give you the work of repairing the city wall!" ”

Tao Youmao kowtowed on the ground and said, "Don't worry, official, we will definitely work hard to do a good job of these barracks!" ”

Now that he was preparing to build the city wall and use cementitious materials on a large scale, Li Zhi had to start making cement.

In the Ming Dynasty, the masonry was bonded with triple soil. In the book "Tiangong Kaiwu", it is recorded: "The ash used for the tomb and the storage pond is divided into river sand, and the loess is divided into two, and glutinous rice, sheep peach vine juice and even... The name is Sanhe soil". This kind of triple soil requires glutinous rice, which is expensive, which directly leads to the high cost of civil engineering in ancient China. And compared to cement, the quality of this triad soil is far inferior.

Li Zhi built the city wall to save his life, of course, using the best materials.

Li Zhi chose to produce Portland cement, which was produced in the early nineteenth century as a simple, sturdy and durable cement.

The cost of Portland cement is much lower than that of triad soil, but the effect is better than that of triad soil. Not only is cement used to build the city wall, but with the spread of Li Zhi's business, the amount of civil engineering projects in various places in the future will not be small, and this kind of cement must be used everywhere.

Limestone and clay are required to fire Portland cement, which is served with a small amount of gypsum as a retarder. Limestone and clay are extremely cheap things, easy to come by, Li Zhi found a miner and ordered 100,000 catties of limestone and 30,000 catties of clay, which cost only a few dozen taels of silver. Gypsum was also mineralized in the late Ming Dynasty, and it was used as a medicinal material, and it was not very expensive. Li Zhi found a big pharmacy in Tianjin, bargained, and ordered 1,000 catties of gypsum at a price of three cents a catty.

Cement production pays attention to two grinding and one burning. Before calcination, limestone and clay should be ground into powder, and 1,300 degrees of high temperature calcination is used in the vertical cellar, and the resulting cement should be ground into powder after calcination.

Li Zhi built several factories outside the south gate of Fanjiazhuang, surrounded by a fence to use them as a factory to produce Portland cement. There are thirty large stone mills in the factory, pulled by donkeys, which are specially used to grind fine materials and finished products. Li Zhi hired four lime craftsmen who fired quicklime for three taels of silver a month, and asked them to erect a cellar in the factory to burn cement.

Li Zhi instructed the craftsmen to grind the materials into powder, mix the limestone according to the ratio of three to one, and send it to the vertical cellar for calcination. The cellar gradually heats up, calcining at the highest temperature for three hours and then turning off the fire to obtain clinker in the form of large and small stones. Li Zhi asked the limesmiths to pour the clinker onto a stone mill and grind it into powder, and then add some gypsum as a retarder.

The four lime masons operated according to Li Zhi's requirements and obtained the first furnace of test products. Li Zhi took it and tried it: cement powder was mixed with water to form a paste, and it was applied to the brick to bond another brick. After the cement was dry, Li Zhi grabbed one brick and lifted the two bricks.

The second brick was still glued to the first brick at first, but with a slight shake, the second brick fell off.

The first cement experiment failed and failed.

Li Zhi was a little annoyed, he thought about it, and checked the formula of Portland cement in his memory again. After confirming that it was correct, Li Zhi felt that the temperature of the cellar might not be enough.

Li Zhi walked up to the two-person tall cellar, looked back and forth, turned his head to the most experienced craftsman and said, "Boss Liang, the temperature is not enough now, can the temperature of your cellar be raised?" ”

As an industrial designer, Li Zhi knew the formula of Portland cement, but he did not study the lime cellar, and could only rely on the craftsmen of this era. After saying this, Li Zhi looked at Boss Liang a little nervously.

Boss Liang replied respectfully: "Official, it can still be improved, but the cellar needs to be renovated." ”

Li Zhi's face was overjoyed, patted Boss Liang's shoulder, and said with a smile: "Then hurry up and transform it!" Hurry! ”

Those lime craftsmen are also veterans, and they have a lot of experience in controlling the cellar. It took them three days to change the cellar and raise the temperature.

After the second furnace was fired, Li Zhi finally produced the world's first qualified Portland cement.

――――――――――――――

Thank you for the reward from the book friend 160829025118860 and the res