Li Shimin, who was thinking, suddenly heard Li Yan's words, his eyes narrowed slightly, turned around and stared at Li Yan and said, "Ye'er, I won't pursue the past, but now we are talking about military and national affairs, and you can't participate without authorization, so why not retreat quickly!"

Li Shimin waved his hand when he said this. Although the altitude sickness that Li Yan just explained helped him, in Li Shimin's opinion, it was just a coincidence and did not change his view of Li Yan from the bottom of his heart, so he did not believe that Li Yan could have any good way to build roads.

Li Ke also quietly pulled Li Yan's clothes behind Li Yan and signaled him not to speak anymore. After all, as princes, they were rude to the government and if they were caught by those who were interested, it would be very unfavorable to him. Li Yan stood up and explained the altitude sickness just now, which scared him. Unexpectedly, Li Yan jumped out again this time.

"Father, what I want to say is not a major military and national affairs. After all, I don't understand these things, but I know that there is something. If I use it to build a road, it will not only be convenient and fast, but also be cheap, but also as solid as a rock and not afraid of water and fire. Even if the road is flooded by floods, as long as the water is not too deep, I can still walk well." Li Yan bowed again and said.

"Oh? There is such a thing in this world?" Li Shimin was also interested by Li Yan's words. Fang Xuanling and others below also looked at Li Yan with interest. They were now full of curiosity about Li Yan and did not understand what amazing actions this unexpected King Liang would do?

"Qi Bing, the name of this object is cement. It is made of several very common materials. It is usually like gray flour. When used, add water, sand, and gravel to stir, and then spread it on the road. In a few days, it will become a stone-like cement pavement. The hardness is almost the same as that of a real stone. Even if it is soaked in water for several years, it will be fine." Li Yan was very satisfied with everyone's reaction and told the new invention of cement in detail.

"Okay, you can make some samples as soon as possible. I will check it with all my dear friends!" Li Shimin slapped the table excitedly. Although he had not seen the real thing yet, only listening to Li Yan's introduction, Li Shimin had sensitively noticed the great significance of the appearance of cement.

"Son of my duty!" Li Yan immediately stood up and accepted the order. Making cement was not a difficult task for Li Yan. In his previous life, he worked everywhere for life. He spent a month in a small cement factory. Later, he couldn't stand the dusty environment in the factory. He worked for a day and his hair was covered with cement blocks and could not be washed off. So after working for a month, he directly paid and left. Li Yan still remembered most of the materials and firing process of cement, so he was still very confident in making cement in the Tang Dynasty.

Fang Xuanling and others ignored cement. Although they believed that Li Yan did not dare to lie about such a big thing, they had not seen the real thing yet and did not know what the performance of cement was, so they all remained silent.

Next, Li Yan asked Li Shimin to ask some craftsmen to assist him, but he did not expect that Li Shimin directly appointed Li Yan as the cement supervisor with a stroke of his pen. He temporarily managed the supervisor and had the right to call all the manpower and material resources he served as the supervisor. The supervisor was a good name, but in fact it was just a temporary official position. The historical department in charge of the promotion of an official was not registered at all, and there was no grade. After the cement was made, it was automatically dismissed.

Li Yan happily accepted the order, and then Li Shimin drove him and Li Ke out of the hall and told him to go and take office as soon as possible to make cement as soon as possible.

As soon as he walked out of the hall, Li Ke grabbed Li Yan and asked anxiously: "Sixth brother, are you really sure to make cement? It's not important for us to make a lot of noise, but we must not do anything wrong in these military and national affairs!"

"Haha, brother San, don't you worry, isn't it just a small cement? You see, I made new tea and distilled liquor before?" Li Yan said with a smile, "I can't guarantee other brothers, but when it comes to making these novel items, I dare say that no one in the Tang Dynasty is better than me."

Li Yan is definitely confident in invention. He has come from later generations and has more than a thousand more knowledge than the Tang people. In addition, the experience and technology accumulated by later generations, isn’t it easy to invent something new?

"This..." Li Ke was still a little hesitant. After all, this is not a trivial matter. If Li Yan cannot do it and is caught by someone who is interested, it will be very unfavorable to Li Yan.

"Third brother, otherwise you would keep following me. See what I did wrong, please give me some advice?" Li Yan saw that Li Ke still didn't believe it, so he could only say helplessly.

"It's good that I have an acquaintance in the prison where I will be in charge. I can introduce it to you." Li Ke's eyes suddenly lit up, and he remembered someone, and said happily. Li Yan was sweating profusely. Unexpectedly, Li Ke had a wide communication and could have people who knew each other anywhere.

It's just after noon, and the daytime is long in June, so it's still early, Li Ke and Li Yan rushed to the general to serve as supervisor. The general was located in the imperial city. After leaving the Tai Chi Palace and passing Chengtian Gate, he turned right, and next to the wall of the palace, he was the general to serve as supervisor. The general was in charge of civil engineering construction, with two masters and three ranks; two young ranks and two junior ranks, and four ranks. There are also offices such as left school, right school, lieutenant colonel, and Zhenguan. There are two offices in the office and one office chief.

When they arrived at the prison, they saw that the prisoners were already waiting for them. They probably had received Li Shimin's order, but they saved Li Yan and explained it.

"I will be the chief craftsman Yuwen Hu. I have met His Highness, King of Shu and His Highness, King of Liang!" The young black-faced official led the man to salute.

"Haha~ Brother Yuwen, don't play these false gifts between you and me!" Li Yan was about to return the gift, but unexpectedly, Li Ke went up and punched Yuwen Hu, and smiled intimately.

Li Yan suddenly realized that the acquaintance Li Ke knew was actually a master in charge. No wonder Li Ke insisted on introducing himself. With the help of this brother Yuwen, he could indeed be much easier.

"Come on Liu Huang, let me introduce you to you. This is my good brother Yuwen Hu. His grandfather is Yuwen Kai, the construction master of the previous dynasty. Brother Yuwen has a deep family knowledge and has a profound attainment in construction. He has already learned from senior Yuwen." Li Ke waved and pulled Li Yan, patted Yuwen Hu's shoulder and introduced him.

The Yuwen Kai mentioned by Li Ke is a great man. He was born in a family of military generals and heroes. He has read a lot of books since he was a child. He is familiar with the rules and regulations and various craftsmanship skills of all dynasties. He personally designed the construction of many big cities, such as Chang'an and Luoyang, two world-famous big cities, both of which were from him, and he also participated in the design of the Grand Canal of Beijing and Hangzhou. It can be said that Yuwen Kai was almost there in large-scale projects during the reign of Emperor Yang of Sui.

"Haha, I heard from my third brother mention Brother Yuwen's name for a long time, but unfortunately I have never been able to meet. I didn't expect that today I would meet because of business, and I would definitely get drunk with Brother Yuwen another day." Li Yan also hurriedly came up to have a relationship. Anyway, Li Ke would not expose him.

"Your Highness King Liang is polite. Your Highness has really admired Your Highness for a long time. Now in the entire Chang'an City, who doesn't know Li Liuhuang's name?" Yuwen Hu was also very polite. Although he had some friendship with Li Ke, he still did not dare to be too presumptuous when facing Li Yan, who had first met.

Li Yan likes others to praise him the most, and he has a good impression of Yuwen Hu at the moment. The two of them praised each other for a few more words before they turned to the topic.

"Brother Yuwen, my father sent me to burn cement this time. Other things are easy to handle, but the selected personnel must be kept confidential. I am not familiar with the general's office, so I have to be with Brother Yuwen." Li Yan didn't want to let someone leak it out as soon as he developed the cement firing method. He was still counting on making money.

"Don't worry, your highness, the official must personally select the person who has passed the letter!" Yuwen Hu patted his chest and promised, but soon frowned and asked, "But we have never seen cement before. I don't know which manpower and materials your highness needs, so the official can prepare?"

Li Yan thought for a moment before speaking: "Well~, I wonder if there are craftsmen who will fire lime or ceramics in the supervisor? The firing of cement is actually very simple. Anyone who can fire lime or ceramics should be able to do it."

"Haha, there are many of these two types of craftsmen in the prison. They belong to the Right School Office and the Zhen Office, which are the supervisors. The subordinates can find people immediately." Yuwen Hu breathed a sigh of relief after hearing this. He was worried that the craftsmen Li Yan asked for were too difficult to find, but he did not expect that the firing requirements of cement were so low?

"Okay, please also ask Brother Yuwen to prepare some limestone, clay, iron slag and gypsum, which are all materials for firing cement." Li Yan then ordered again.

"Don't worry, your highness, please prepare now. Please wait in the hall!" Yuwen Hu is worthy of being a technical background. He is a typical activist. After hearing Li Yan's orders, he immediately left and left Li Yan and Li Ke in the lobby of his official office.

"Haha, this brother Yuwen is still the same. He is always very excited and does not delay for a moment." Li Ke had already understood Yuwen Hu's personality and said to Li Yan with a smile.

"Brother Yuwen is a person who does practical things. Only a person like him can be competent in the position of being a master of the supervisor." Li Yan admired Yuwen Hu very much. There were many more types of craftsmen in the prison than in his mansion. If he wanted to do something new in the future, he would probably have to deal with Yuwen Hu.

The two sat in the hall for a while and felt a little bored. Li Ke was a person who couldn't stop. He stood up and walked around the hall for a few times, then skillfully walked to a corner of the hall, opened a hidden small door and waved to Li Yan, "Sixth brother, come and see the novel things to be produced by the supervisor. There are many good things here!"
Chapter completed!