The next morning, as soon as Li Su had breakfast, Bai Qing ran to the Liang Wang's mansion to ask for a meeting, and Li Su hurriedly summoned him in.

But after a while, I saw Bai Qing, who was covered in dust, trotting in from outside the hall, and bowed with two red eyes: "Xiaguan Baiqing, see His Royal Highness King Liang." ”

"Well, get up!" Li Yu tasted the tea and said with a smile, "Seeing that you are in such a hurry, it must be that yesterday's cement has been calcined, right?" ”

"Your Highness is wise, yesterday I was busy with the craftsmen all night, and finally finished calcining the cement, and sure enough, as His Highness said, what I got was a gray powder, and I wanted to ask His Highness to take a look!" Bai Qing replied very excitedly.

"Good!" As soon as Li Su slapped the table, stood up and went with Bai Qing to be a prisoner, and when he was on the way, he also made a special chapter 35 of burning cement (below) to let him ride with him, and as a result, Bai Qing, who was nearly half a hundred years old, was moved to tears, and kept telling his gratitude and admiration along the way.

It was still yesterday's lime-burning yard, but on a mat in the middle of the yard, there was a pile of very inconspicuous gray powder. Li Su walked forward quickly, reached out and grabbed a little and rubbed it: Well, it feels good, and it is basically no different from the cement of later generations.

"Your Highness, is this cement calcined usable?" Bai Qing next to him asked nervously, although the burned cement was basically the same as what Li Su described, he still had no bottom in his heart, for fear that something would cause the cement to be unusable.

"Well, well done, this cement calcination is excellent!" Li Su saw that Bai Qing and the craftsmen around him were all nervous, and couldn't help laughing, it seems that they think about cement too complicated, in fact, this thing is very cheap, just find someone to tell him the manufacturing method, you can make usable cement, not to mention these experienced craftsmen?

Hearing Li Su's praise, Bai Qing and the others breathed a sigh of relief, this is what Li Shimin personally explained, although it can't be done with Li Su, but their 35th chapter burning cement (II) These main craftsmen will inevitably be implicated, and they will be fined at least half a month.

In fact, this is not really cement, because there is still one last process left. Li Su asked people to take the gypsum powder that had been ground yesterday, and then add about three percent of the gypsum powder in proportion to adjust it, and the gypsum was mainly to delay the hardening speed of the cement, so as to facilitate the subsequent construction. It was not until this time that the first batch of cement in Datang was truly successful.

"Bai Qing, you have people prepare water, sand and gravel, and dig a five-foot square pool on the ground, not more than half a foot deep." Although the cement has been made, it is not yet the time to dedicate it to my father, at least I have to test it to see how it works, at least to be sure of it.

When Bai Qing heard Li Su's order, he immediately led people to take action, digging pits and carrying water, and after a while, they were all ready. Bai Qing and those craftsmen only received orders from above to assist Li Su in firing cement, but as for what the cement was for, they didn't know at all, and they didn't say anything when Li Su came yesterday, so of course they didn't dare to ask. Looking at Li Su's posture now, he must be trying to test the effect of cement, so these craftsmen stretched out their heads one by one and waited to see, after all, everyone has curiosity.

In order to increase the strength of the concrete, Li Su also deliberately reduced the proportion of sand and gravel, if it were not for too little cement, Li Su even wanted to make pure cement slabs without adding sand and gravel.

After the cement slurry was poured into the pit, Li Su asked people to flatten it with a wooden plank, and then spread a layer of straw, and told Bai Qing to sprinkle water from time to time, so that the concrete would not crack, Bai Qing was still very serious and wrote it down one by one.

When the concrete is really dry, it is estimated that it will take at least a week, and the craftsmen cannot wait for these seven days. So Li Su instructed Bai Qing to let the craftsman burn the lime with all his strength in the past few days, and also gave him a task that challenged patience, that is, let him mix the cement with the sand and gravel in different proportions, and then make a concrete slab like he had just done, make a comparison, and find the best ratio.

Bai Qing naturally gladly accepted the order, Li Su was able to hand over such an important matter to him, which shows his trust in himself, and this matter is not difficult, as long as he spends a little effort, anyone can do it, obviously it is the credit that Li Subai gave him, and he figured this out, which made Bai Qing inexplicably grateful to Li Su.

After explaining the matter, there was nothing to do with Li Su. However, since he had entered the imperial city, Li Su was not in a hurry to return home, first went to find Li Shimin to report the progress of cement production, heard that the cement had been made, and now the effect was being tested, Li Shimin was overjoyed, patted Li Su's shoulder and shouted, if it wasn't for Li Su's stop, it is estimated that Li Shimin would run to appreciate the pool of muddy cement slurry now.

After getting his father, Li Su went to Wangyun Hall to visit Concubine Yang again, but this time she threw herself into the net, Concubine Yang was very dissatisfied with Li Su's 'confession' in public at the banquet of the Five Kings, and she held his ear for a long time, and finally found a chance to escape.

Seven days passed in a flash, and two major events took place in these seven days.

The first was that the Tibetan ambassador insulted the royal family, was caught by Jin Wuwei, and should have been sentenced to death, but Nian was friendly with the two countries, so he only killed a few of the Tubo ambassador's entourage, and as for the ambassador Lu Dongzan himself, he was sentenced to a heavy beating of 50 boards and imprisoned for two years as punishment. Moreover, Taizong Li Shimin also wrote a harshly worded letter to Tubo Zampu, and reprimanded him in a very strong tone. At the same time, he sent the general Niu Jinda and led 30,000 elite soldiers into Jiannan Road to closely monitor every move of the Tubo people.

The second thing is that the wine-making workshop jointly opened by Li Su, Li Daozong, Li Xiaogong and other five people has officially started winemaking. Originally, the brewing workshop would not start until the end of the month at the earliest, but since Li Su had made the cement out, he made the construction in the workshop simple, and the houses and roads would be temporarily replaced, and when the cement came out, it would be replaced with cement, which was much stronger than the masonry and civil engineering structure.

The yard that burned the cement was officially set aside by Yuwen Hu to make a cement workshop, and Bai Qing was fully responsible, Bai Qing would go to Li Su's house every morning to report all the matters of the cement workshop, of course, the condensation of cement is the focus of the report, and before dawn today, Bai Qing came to report that the cement had finally solidified into strong and durable concrete.

When Li Su heard the news, he immediately collapsed from the bed, got dressed as quickly as possible, went to the front hall to find Bai Qing, and the two came to the prison together.

In the courtyard of the cement workshop, in addition to the cement slab personally supervised by Li Su, there were also cement slabs made by Bai Qing's commander later, and several of them were almost dry. The first cement slab was already surrounded by craftsmen, and everyone touched the cement slab with their hands from time to time and discussed something in a whisper.

"Hurry up and get out of the way, Your Highness is here!" The attention of these craftsmen was attracted by the cement slab under them, and they didn't even notice the arrival of Li Su and Bai Qing, and directly reminded Bai Qing, which made them quickly get out of the way.

Li Su smiled and nodded at the craftsmen, and then walked quickly to the cement slab, the straw on it had been cleaned, revealing a very flat cement slab. Li Su stepped on it with his foot and found that it had indeed condensed.

"Come on, dig out the cement slab!" Li Su ordered excitedly. Immediately, craftsmen who had been prepared for a long time stepped forward to excavate, and in a short time, a half-foot-thick cement slab was dug out and stood up with sticks supported by the craftsmen.

"Your Highness, this cement is really a strange thing, who would have thought that just after calcining with a few common materials, it can actually bond gravel and sand, and it is extremely hard, even if it is not comparable to marble, it is estimated that it is not much different." Bai Qing tapped his fingers on the cement slab and said with admiration.

"Well, it's not hard or not, you have to try it to know, go get a sledgehammer!" Li Su will not be confused by the appearance of this cement board, he believes that only practice is the only criterion for testing the truth, to know whether the cement board is strong? It's simple, just hit it with a hammer a few times.

After a while, a craftsman brought a sledgehammer, the hammer head was half the size of a watermelon, Li Su took it and tried it, it felt okay, and then picked it up and smashed it on the cement slab.

"Huh~" With a muffled sound, Li Su only felt that his hands were numb, and his arms were also faintly painful, and then looked at the smashed cement slab, but only a few pieces of debris flew out, and a shallow dent was smashed.

"Hiss~, it's so sturdy!" The craftsmen around them all gasped and exclaimed in unison.

Li Su then smashed it a few more times, and finally shook his arms unconsciously, and then stopped, although the cement slab left traces of being smashed, but for the cement slab as thick as half a foot, it was nothing at all.

"Hehe, good quality!" Li Su nodded with satisfaction, the quality of this cement board is almost the same as that of the board made of general cement in later generations, of course, this is mainly because the craftsmen polish the materials very finely, from calcination to hardening are very attentive, if it is to be mass-produced in the future, without the help of later generations of machinery, it is estimated that the quality will decline some, but it is enough to meet the needs of Datang at this stage.

"It's all because of the great man's command that he can make something like cement!" Bai Qing would not let go of any opportunity to pat Li Su's ass, seeing that Li Su was so happy, he immediately came up to flatter.

"Hahaha~, I'm just moving my mouth, if you don't have the help of Bai Qing and all the craftsmen, where can I make cement? You are all waiting here, I will go and ask my father to come and have a look, and by the way, I will help you ask for credit! Li Su smiled and patted Bai Qing's shoulder and praised.

Bai Qing and the craftsmen behind him listened to Li Su's words, and their happy faces were about to burst into laughter, Bai Qing wanted to be modest, but Li Su had already turned around and was about to leave, but as soon as he walked to the door, he suddenly turned around and said to Bai Qing: "Don't forget to invite Brother Yuwen here, he also has a share of the credit here." ”

Bai Qing was shocked in his heart, and immediately agreed, after watching Li Su leave, he immediately trotted to invite Yuwen Hu, and at the same time he was glad in his heart, if it wasn't for Li Su's reminder, he really forgot to invite Yuwen Hu, Yuwen Hu is Bai Qing's top boss, and these people are also selected by Yuwen Hu, so of course he is indispensable in terms of credit!!