"Lord Wang, what are you?"

On the third day, Steward Jin and the others came again, but they saw Zhu Zilong getting up earlier than them. And it was in the courtyard, pounding up a cloud of mud and sand, so I was puzzled and stepped forward to ask one or two.

"Oh, me? Well, it's called cement! Zhu Zilong replied casually.

"Cement? Oh! Steward Jin and the others looked at it and nodded, this is a mixture of water and mud and dust, isn't it water and mud? Abbreviated as cement is indeed very imaged.

"Lord Wang, is this cement useful?" Steward Jin originally wanted to report something important, but he saw Zhu Zilong playing with this cement very seriously. Thinking about it, now that the prince is a prodigal son, he will not change his money, and everything will not be as simple as it seems.

So, before he came out, he changed his words and asked what the cement was for.

"Hehe, my cement, but it's very useful. In the future, you have to rely on it to build Qin straight roads, roads, houses, city walls, and everything. But the cost is not large, but it is a multi-purpose baby! Zhu Zilong was also a little interested and explained loudly.

"Lord Wang, is this thing really so wonderful? It's unlikely, right? Steward Jin obviously didn't believe it: "Let's not talk about building city walls or anything like that, let's just say that it is used to build roads." How can this muddy state be overwhelmed? In the past dynasties, when roads were built, it was either gravel or a whole large stone slab, and no matter how bad the place was, it was mainly hard soil! ”

"That was before, if everything was business as usual, not only when the people were injured, but also when the people were injured, the casualties of the people would be posted. Therefore, this king deliberately found another way, that is, to combine the wisdom of his predecessors and create all new ideas. That's why we have this cement! Zhu Zilong didn't blush at all, and directly put the invention of cement on his head.

"Come, come, come, you wait here to take a look!" Zhu Zilong, who was about to pretend to be deeper, called Steward Jin and the others to the corner of the wall.

But I saw that place, and three large stone slabs were laid out.

Zhu Zilong pointed to the first stone slab and said, "This is what this king did yesterday, you wait and stand up and try it all." ”

So, Steward Jin, Wu Song, Yang Zhi, Lin Chong and others, a total of about ten people, all stood up. Nothing happened!

Zhu Zilong pointed to the second stone slab and said, "This is what this king did the day before yesterday, you wait and call the guards outside, and all of them stand up and try it." ”

As a result, nearly 20 people all stood on the second large stone slab, and there was no damage to the slate.

Zhu Zilong pointed to the third big stone slab and said, "This is what this king did three days ago, come on, put on the props." Pull the wagon full of stones! ”

As he spoke, a large carriage loaded with stones came in, and its weight was much heavier than that of fifty men combined. Running back and forth on this third slab.

The same is true of the slate, which is not damaged in the slightest!

After the test, Zhu Zilong walked in front of the cement pile that was not dry before, like a mess of mud. He said: "These three stone slabs are all made of cement, and you can witness it with your own eyes, can it be magical?" ”

"What? Those three slate are cement? How is this possible? Steward Jin and Lin Chong, Yang Zhi and so on all opened their eyes in an instant, and their faces were in disbelief.

"This king has always spoken with facts, you wait and watch me try again. The cement here is almost ready! Zhu Zilong worked neatly with his hands and feet, and soon piled the still wet cement into a stone square in a dry place.

After doing this, Zhu Zilong looked at the sky, then at the crowd, and said, "I'll go into the house for breakfast first, and then come out and see later." ”

So, all the people entered the room.

After breakfast, some important matters were discussed, and before I knew it, two or three hours had passed. After closing his hands and finishing his business, Zhu Zilong said to everyone in the room: "Okay, now everyone can go out, the time has come to witness the miracle!" ”

-

In the courtyard, the new stone slabs that used to be like mud and overwhelmed are now mostly gone. Although there was still a feeling of wetness, Zhu Zilong stepped on it with both feet, as if falling to the ground.

Then, Zhu Zilong took turns to let Lin Chong, Yang Zhi, Steward Jin and others go up and try it.

Everyone who tried it looked dumbfounded.

"How?" Zhu Zilong said with a smile: "The more time passes, the harder the dried cement will be." In the end, it is not much harder than natural stones. However, this material is simple, easy to transport, and does not work hard and labor. It can save dozens of times the time, minimize the transportation costs used to build roads, and will not work and hurt people! ”

"If it is used to repair the city wall, its viscosity is also very strong, but it can save glutinous rice juice, and the cost will be greatly reduced."

Every time Zhu Zilong said a word, the faces of Steward Jin and the others became more and more shocked.

Using this cement to build roads is already believing, and it is very convenient. If it is used to build the city wall according to the word, it is also feasible. That would really cause the entire Great Song Dynasty to shake, and the emperor would not be able to sit still.

Successive dynasties have built city walls and houses, but if the number of floors is not high, it is nothing. As long as the height and number of layers are high, if they are still stable, they must be adhesive.

Generally, glutinous rice juice is the main one, and soft mud is also used as a neutralizing agent.

However, even if this is the case, because manpower is limited and the texture of the soil is relatively loose, the earthen walls are generally very thick, very thick.

And it's not straight up and down, it's trapezoidal!

Zhu Zilong also knows this. Because it is trapezoidal and angled, when attacking the city, as long as the enemy fights to a certain number, it is easy to go up to the top of the city wall without equipment.

By the Song Dynasty, bricks had already been invented, but the city walls were still made according to the old method. Rammed earth in the middle, bricks on the outside. At least that's how the Great Wall was built, and if the whole structure were made of bricks, it would be more fragile.

However, the role of the city wall was extremely huge, especially for the Great Song Dynasty, which did not have many horses.

Therefore, how to speed up the repair of the city walls in various places has always been one of the tasks of local officials. Don't look at the founding of the Great Song Dynasty for more than 100 years now, but the city walls in some places have not been completely repaired.

One of the reasons is that due to the war between soldiers and horses, it took too much manpower and money to repair the city wall in ancient times, and it was usually demolished after being broken before it was repaired. For example, the walls of Ye, Luoyang, and Chang'an in the Northern and Southern Dynasties were destroyed in war many times.

The second is that it consumes manpower, material resources and time for too long, so we can see why once the northern nomads break through the northern border, they can often connect a dozen to dozens of cities in the Central Plains.

It's not that the city defense forces don't work hard, but that the cost of repairing the city is too great, and in the troubled times, it is often not repaired and destroyed, resulting in the very limited role of these dilapidated city walls.

However, if you have an intact city wall in hand, it is a different picture.

If the defender has enough food and grass, and the defender is brave and resourceful, it will be difficult to capture in most cases. Even if 10,000 people block 100,000 enemy troops, it is not difficult!

---------