The four days passed quickly, and Wei Renshi arrived at the hunting ground in advance to wait.

After a short time, it was Li Chun who arrived first, he was dressed as Zhou Zheng, and after getting off the horse, he said to Wei Renshi: "I heard that my father is going to bring a few Eastern Palace courtiers today. ”

After a while, it was Fan Zhiyi and Du Yun who also ran over.

Seeing that Wei Renshi was a little surprised, Li Chun said, "I called them." Thinking that I had seen it together before, I must have been curious. ”

Wei Renshi nodded, and he also knew Li Chun's careful thoughts. These people are similar or similar to Li Chun's age, and they are all nobles, so they will definitely have a position in the court in the future. Get together as soon as possible, and have a relationship with him as soon as possible.

It's a pity that Li Chan's time was too short and he didn't give Li Chan the opportunity to cultivate his own people, so Li Chan would be elbowed in the early stage after he ascended the throne.

"Brother Renshi, how did you do that day?" As soon as Fan Zhiyi came over, he asked.

"Who's that, bring a knife!" Wei Renshi raised his head and pointed to the guards behind Li Chun and said.

The previous guard looked at Li Chun, and when he saw Li Chun nodding, he immediately untied his saber and ran forward and handed it to Wei Renshi.

Wei Renshi took a knife and slashed the cement a few times, and then smashed it several times with a knife. Looking at the concrete floor, there is no trace left.

"Great!" Wei Renshi waved his fist excitedly.

Sure enough, the hard gravel mixed with cement pavement is very strong, although not as good as asphalt, but it is much more expensive than today's sandy roads.

When I looked up, I saw that there was a one-man high masonry wall not far behind the concrete floor, but the middle of the masonry wall was not the common yellow mud or the like, but was built together with cement.

Wei Renshi walked over and pushed the wall, and then said to Dog Er: "Second Brother Dog, you come and kick hard!" ”

Dog Er nodded, and ran to the half of the wall as if a person was crazy, and his legs sank and shouted violently, and one leg was drawn to the half of the wall. The wall didn't even react at all, but Gou Er himself was bounced back and retreated several steps.

Everyone was even more shocked, they couldn't hold it back at the moment, and they tried it in turns, but they couldn't.

and slashed with a knife, but it was useless.

Not far from the wall, it was a short wall, but it was thick at the bottom, and it became thinner and thinner the higher it went, but it was not thin on the whole. The crowd was passing by, but they heard the sound of horses' hooves.

Looking back, a group of guards came on horseback, followed by several carriages, and they also came.

The crowd hurried over to greet them.

Li Yu got down from the carriage wrapped in a fox cloak, and a few ministers also got down from the back carriages, some Wei Renshi knew, some had just seen it, and some had new faces.

"Meet His Royal Highness the Prince." Wei Renshi went over to salute.

Li Yu waved his hand, pointed to the few cement things, and asked, "These are the things that Wei Xiannan wants to let Gu see?" ”

Wei Renshi nodded and said, "Nowadays, everyone builds houses and stones, and uses yellow mud mixed with thatch to glue them. Sometimes the outside is covered with yellow mud. Paving the road, the best road at the moment is the official road, which is paved with coarse sand. This thing that the minister has made now, Your Highness will look at it. ”

As he spoke, Wei Renshi asked someone to bring a bag of cement, reconciled it in front of Li Yu, and said, "Your Highness, the things in the back are all made of this thing, but they are just like after they have dried up. ”

Li Yu squatted down to look at the cement and said, "It's a little similar to the yellow mud." ”

With that, he got up again and walked to the small platform.

"Your Highness, this is a concrete road paved with cement mixed with gravel." Wei Renshi pointed to his feet and said.

"Concrete road?" Li Yu looked down and stomped on his foot a few times, feeling as hard as a stone, and he was very surprised at the moment.

"Returning to Your Highness, this thing is a road paved with cement, and it is naturally a cement road. After the cement is diluted back when it encounters water, after it is built, it will re-solidify and harden into a whole, and after the cement is mixed with hard gravel, the cement will firmly condense the gravel together, as hard as a stubborn stone. For example, cement is a 'fish gelatin' that can tightly condense the stone into a whole, and then smooth the cement on the surface while the cement is not dry, and after drying, the surface is smooth. And the cement ash is exchanged and stirred, and it will become hard again after softening and molding. ”

After a pause, Wei Renshi said to Li Yu and the ministers: "After it becomes hard, it is not afraid of water and fire, it is hard and wear-resistant, and it is a rare good material for building roads and walls." Like here, the cement road is not only strong, but also smooth, so it won't get sand on windy days, muddy on rainy days, and won't get stuck in traffic. Even if ten thousand horses trample on it, it will not be destroyed. Because it is smooth and sturdy, the carriage can run very fast and the travel time will be much shorter. ”

Everyone walked around with their feet curiously, stomped hard, or squatted down to touch it.

"Let's try it." A mighty middle-aged man stepped forward, lifted his foot, and stomped it down hard.

Naturally, there was nothing wrong with the cement pavement, but the man's feet shook and his mouth gritted his teeth.

"Your Highness, this ground is really solid, and when you go under your feet, the ordinary walls have to be kicked and cracked, and this ground is intact!" The man raised his foot and said to Li Yu.

Li Yu nodded, his expression becoming more and more serious.

Seeing that Li Yu was serious, Wei Renshi smiled and said: "And this thing is extremely strong to build a wall, and it does not resist fire, even if it is smashed with a hammer, it will take a lot of effort." However, if the city wall is built by mixing masonry, iron bars and specific soil, the entire city wall is as solid as a rock, and even trebuchets cannot smash it. ”

Li Yu was first startled, and then his expression was solemn.

Wei Renshi pointed to the low wall next to him and said, "This is a wall made of bricks and stones by the minister's envoys. There is a hammer next to it, and His Highness can make people try it. ”

Li Yu turned his head to look at his guards and said, "You bring a few people over and smash them." ”

The guard nodded, led a few men to run over, picked up the hammer, picked it up high, and then smashed it hard.

The scene of rubble flying in everyone's minds did not appear, and the wall did not move. Several guards took turns smashing over, and only a few pieces of cement fell off on it, and a few thin cracks were born.

Li Yu's eyes widened, and he walked over and stared at the wall.

"If you use cement, mix aggregates, sand, stones, etc., to make cement concrete, and build a city wall." Wei Renshi's voice sounded again, and he pointed to the short section of the low wall made in the shape of the city wall, and said, "Even if you use a trebuchet, you can't smash it." ”

As soon as Wei Renshi finished speaking, he saw the four of Shi Boss come out from the side and push out a shelf from the back of the carriage, on which a boulder was hung with iron chains. Li Chun hurriedly waved his hand, and several guards went over and helped push the wooden frame to the wall.

Everyone worked together to push the boulder backwards, and then let go of their hands in unison.

The boulder fell hard, and slammed into it!

The group went over again, pushing the boulder backwards, then letting go of their hands again and letting the boulder smash through.

Everyone opened their mouths wide and watched, watching the boulder smash it more than ten times.

The guards involved in it widened their eyes at the moment, and their faces were amazed, as if they had seen something impossible.

The same is true of the ministers.

Li Yu even ran over directly.