In a flash, three months passed, the development of Youzhou City gradually returned to normal, and everything entered a normal track.

In order to have a better harvest, the people will be able to have enough food and clothing in the coming year, and they are all working hard to do farm work again. In order to try to hoard grain as soon as possible, for example, Guo Jia and Xu Maogong work together to help deal with the government affairs, Dian Wei and Ding Feng work together to take charge of the army. Every day, the loud military singing will be heard. This is specially added by Zifan to gather the brotherly feelings of the army. Youzhou City has been completely renewed, everything is well managed, and the streets have returned to its former prosperity and a prosperous scene.

So Zifan, as the prefect, lived a very comfortable life during this period. He either ate small restaurants for the sake of examining the people's conditions, or went to brothels to have a great time, and fought with soldiers in the military camps. Now Zifan finally knows why ancient people were able to pass time so much, and there was spring everywhere!

A few days later, Guo Jia delivered all the sorted reports to Zi Fan in order, but his face was hesitant, and he looked like he was not confused, and his face was full of thoughts.

"What's wrong? Is there anything difficult?" There is no need to hesitate between you and me." Zifan looked up at Guo Jia.

"Lord, this Youzhou area was destroyed by the Yellow Turban Army's successive invasion of the border two years ago. The city wall was already dilapidated and unable to resist powerful foreign enemies. Many people reported that they have been harassed by bandits recently. So I want to build a city wall on the border to resist the attacks of bandits, and for the sake of the safety of the people. But I am afraid that it may not be able to be built in such a short period of time," Guo Jia shook his head and sighed.

"Oh, then how do you usually build the city wall!" Zifan asked.

"The city wall is made of soil, made of rammed earth, and is made of rammed earth. It is tightened with local loess or black soil, and is layer by layer, each layer is hit to a thickness of fifteen centimeters. In order to make the city wall strong and durable, the wall of the city wall is not made into a straight line, but the upper wall is folded inward to become a "side foot".

The thickness of the city wall is four meters at the bottom and three to five meters at the top, with a height of about seven to ten meters. The city wall built with soil is strong and durable, and has strong defensiveness. The city wall is built with rammed earth at the gate and corner tower to build the city wall. The width of the city wall is relaxed, and the same as the city wall is done. The upper part is to make a rammed hole (tube voucher) and continue to rammed earth. The top of the wall is paved with bricks, and then a column is erected to build a floor of houses. This is used as the city tower. The city tower is a sign, and the location of the city can be seen from a distance.

At the same time, it is also a defensive facility, which can peek at the enemy or shoot arrows. The wall wall is wide and has a height of seven to eight meters, so the amount of soil is quite large. This is the simplest step. If you build a city wall, the brick and stone wall will be even slower. The brick and stone wall is a layer of large bricks on the two breads of the rammed earth wall. Hundreds of stonemasons need to cut the stones into rectangles in advance and then build them one by one." Guo Jia quickly explained.

"Did you always build city walls like this before? The complex project needs to be greatly improved, no matter whether it is manpower or material resources." Zifan shook his head and murmured.

"Yes! Any city wall is built like this, and there is never an exception," Guo Jia replied.

"It just takes at least two years, and a large number of craftsmen, but now it is urgent that time is far from enough. In addition, Youzhou City is just one of all things in one's mind. It is not good to use a lot of people's power now." Guo Jia sighed long.

Zifan touched the few beards left on his chin and nodded: "I understand that if you want to build a city wall in a short time, you must adopt reasonable plans and technologies that do not belong to this era."

In this way, you first order the craftsmen to build a small processing factory next to the mansion, and then recruit a large number of workers, and distribute food and accommodation every day according to the wages. Then go to the mine veins in the south, and dig the ore according to the area on the order I gave me, and let them pile the soil on the side and transport it to the processing plant to pile it into a wall."

After guidance from the system map, we also found the nearby mine veins, but there is not yet mature high-tech. We can only work with migrant workers to mine day and night.

Guo Jia looked down at the list and asked in confusion: "What are the uses of these ores!"

"These can be used to make cement," "Cement! What is cement?"

Zifan smiled and said, "It can speed up the construction of the city wall and stick stones together. I will write you a detailed information on how to use cement, and you will know it when the time comes."

That's it, but Guo Jia was still skeptical and looked disbelieving.

Cement is actually very simple to make. Cement is made of limestone, clay, and iron ore powder in proportion. The mixture at this time is called raw material. Then it is calcined. Generally, the temperature is around 1,450 degrees, and the calcined product is called clinker.

Then grind the clinker and gypsum together and mix it in proportion to be called cement. The cement is stirred with water and formed into a slurry, which can harden in air or in water, and can firmly glue sand, stone and other materials together.

This is because the substances in cement react with water, and small crystals are formed in the initial stage to wrap on the surface of cement particles. These fine crystals are bonded together by very little attraction, thus forming a network structure called solidified structure. Since this structure is formed by extremely small attraction disorderly bonding together, the strength of this structure is very low and has obvious plasticity.

When Guo Jia saw that this kind of thing called cement could be converted from liquid to solid overnight and produce extremely high adhesion, he showed an incredible look of shock on his face.

After all, for the ancients, cement was already a high-tech product.

More importantly, it can also shape the body at will. Isn’t this equivalent to craftsmen without cutting and grinding stones, they just need to put the cement in a fixed box, and when the cement cools slowly, they can be directly used as bricks, which can be abandoned in the time-consuming and laborious processing stage. In this way, the speed of the city wall will be raised to a new level and the speed of the project will be greatly improved.

If there are too many people, it will be completed in half a year!" Guo Jia's voice trembled a little. He didn't expect that there were such magical items in the world, which was far beyond his imagination.

The speed of any building construction will be greatly accelerated in the future, and the cement production process is extremely simple. The important task of building the Great Wall will be entrusted to you in the future. I believe my brother will definitely not let my hope down. Zifan patted Guo Jia on the shoulder and said with a smile.

"My lord, you can rest assured that such a heavy task will be completed." Guo Jia bowed and looked at the cement information beside him. He was very ecstatic and held it in his hand and analyzed it carefully.
Chapter completed!