What is going on with concrete, Li Yuanjia still understands.

Anyone who has been decorated or repaired at home basically knows that concrete is made of cement and sandstone, and as long as there are enough people to slowly do experiments, they can always find the best ratio.

But when it comes to cement, Li Yuanjia is really a layman.

In addition to knowing that cement is made of limestone, that is, lime is the main raw material, and some clay is added, what specific things need to be added, what are their proportions and other details, it is simply confusing, and there is no concept at all.

But fortunately, lime is not a rare thing, and it has been used a lot in the wounded barracks before, and it is too simple for Li Yuanjia to get it.

With the raw materials, it's good to keep trying.

In fact, the reason why many seemingly simple things were not invented in ancient times is not because the technical requirements are too high or anything, but because people do not study and try with a purpose as they did in the 20th century. It's like glass, cement, or coke, you never think to invent them, you can only "invent" them until a craftsman discovers a special phenomenon at some point.

And Li Yuanjia's biggest advantage lies in this!

He doesn't know how to make glass, he doesn't know how to make iron pots and thirteen incense, and he doesn't know the ratio of raw materials for cement, as well as the improvement method of overturning, but Li Yuanjia knows how to research, discover, and manufacture!

And more importantly, Han Wangfu has money, and Li Yuanjia also has people!

From ancient times to the present, whether in the East or the West, inventors have always been lone fighters, so no matter how perseverance and persistence they have, they are always fighting alone, relying only on decades of perseverance or personal superhuman talent.

It wasn't until the 19th century, when Bayer opened the door to teamwork, and then Edison developed this method, that "invention" became easier.

Otherwise, where did Edison's countless patents come from?

If he really relied on him to do experiments alone, how many things would he be able to invent in his lifetime?

Therefore, Li Yuanjia, as the prince of the Tang Dynasty, was a bug in the ranks of inventors during this Zhenguan period. He has enough manpower to form "research teams" one after another, and he also has enough money to keep these teams experimenting. What's even more buggy is that Li Yuanjia can also point out a direction for these teams!

So cement is definitely much easier for him than glass or something.

Merely......

Now the question is, do you want to take this thing out?

Cement is indeed a good thing, whether in the military or in daily life, the use of cement can be said to cover all aspects. The reason why Li Yuanjia hesitated was not only because there were too many "research projects" now, but also because the cost was too high if he wanted to use cement.

Don't think that burning lime is so easy, it requires a lot of manpower and fuel, and it all has to be piled up with money.

So after thinking about it for a while, Li Yuanjia finally found Han Lucheng: "Go find some lime and clay...... Prepare more, and then find me a few more people, and go to the small courtyard in the back early tomorrow morning!" ”

"Yes, my lord."

As soon as he heard it, he knew what it meant, and Han Lucheng immediately bowed down and said yes.

The small courtyard at the back is an atom specially sorted out by the king and Han Lucheng, which is about the size of half an acre of land, and there are three very spacious rooms. Usually it is empty, and it will only be used when the king needs it temporarily.

"Looks like the king wants to do something again."

Han Lucheng, who guessed Li Yuanjia's thoughts, hurriedly went out to prepare while pondering various possibilities. Although there is still some quicklime in the house, Han Lucheng doesn't know how much the king will use, so it is safer to hurry up and prepare some more.

As for clay, it's supposed to be outside of the city, right?

And just as Han Lucheng hurried to prepare, Li Yuanjia also rubbed his chin and fell into deep thought: "By the way, this cement ...... Is it okay to mix quicklime and clay? Or is it better to burn limestone and clay together to ashes? Do you want to try the same thing again? It's not just time-consuming, it's going to cost money......"

……

When Li Yuanjia was busy pondering the matter of drying salt and cement in the sea, in a palace not far from Shengye Fang, a pair of small eyes were staring at a stack of white paper on the table, his brows were tightly locked, and his chubby cheeks were constantly twitching, as if the things on the white paper were some kind of enemy.

Li Tai's posture lasted for at least one stick of incense.

Then his squinted eyes opened suddenly, as if he suddenly remembered something, his frown instantly relaxed, and he picked up the charcoal pen in his hand and wrote on the white paper......

The slender willow branch charcoal is very easy to use.

This thing was given to him by Li Yuanjia, the king of Han, who knew that he was interested in mathematics, and at the same time gave him that set of books, he also sent fifty charcoal pens. Originally, Li Tai disdained to use this kind of thing, because he felt that this thing was too hard and he couldn't write any good words at all. But when he found that he had enough time to write ten words with a brush, enough to write more than thirty words with charcoal, he slowly began to use them.

At first, I only used it occasionally, and then I used it more and more often, and it took longer and longer......

After spending another two pillars of incense, Li Tai finally stopped the charcoal in his hand, looked at the number on the white paper, and opened the back of the sixth volume of "Mathematics" to look at the answer, and finally exhaled a breath, and his whole face stretched.

That's it!

It's finally done!

"I didn't expect that these six math books would take Benwang so long!"

patted the thick stack of white paper in front of him, and looked at the six math books next to him that had been doubled to "thick", Li Tai's face gradually showed a smile, and his eyes were full of pride!

No one taught, and basically no one was asked, Li Tai just relied on himself to eat these six books little by little!

You must know that he is not the idle king of Uncle Eleven, there are many affairs every day, and there is not a lot of time to really use love to read books to solve problems, so you can imagine how satisfied he was when he made the correct answer to the last difficult question.

It's just that while being satisfied, Li Tai's heart is also a little unpleasant.

He always felt that these six books did not seem to be finished, and this feeling of not being addicted was the psychological embodiment of this speculation. So after hesitating for a moment, Li Tai wrote a post with a pen, and then handed it to the person waiting next to him: "Here, immediately send someone to send it to King Han, go to ...... now"