Ministry of Works Backyard.

The craftsman can stir the volcanic ash successfully.

The craftsmen have already honed their skills to their own bones for this kind of mortar mixing technique.

Of course, it was the first time to use volcanic ash as the material. It was stirred with ripe lime and glutinous rice slurry before.

This glutinous rice mortar is the oldest craft in China. The Great Wall can last for thousands of years and it is this glutinous rice mortar.

The stirring of cement is no different from stirring glutinous rice slurry.

After mixing well, the craftsman smeared the cement on all sides of the big bluestone and built a small fence with more than twenty big bluestones.

After grinding into fine powder, the volcanic ash is mixed with lime and water, and a chemical reaction occurs soon and begins to harden.

This kind of chemical reaction has never been encountered by anyone.

One by one, I was dumbfounded.

Yan Lide yelled in a low voice: "It's only been half an hour, I'm going to do it now, it's too fast, right?" As he said that, he pushed his hand without moving.

Li Yuanai smiled and said, "It only takes several hours of hardening on the surface. After it is completely hardened, the sword is extremely difficult to damage. It is far stronger than glutinous rice mortar and rammed earth. As for the Qihe soil that is brushed, it is not worth comparing with it."

Yan Lide saw the power, and it was not completely hardened, and he couldn't push it anymore. What a scene he would be after the task was completed, it was self-evident, his eyes lit up, and he said, "Wouldn't it be possible to use it to create a city wall?"

"Of course!" Li Yuanai replied without hesitation, and then said: "It's just that some of the abilities are useless. Could it be that my current city is not strong enough?"

Yan Lide thought it was right. Just judging from the strength of the city, the current combination of glutinous rice mortar with blue bricks and rammed earth is sufficient, which is extremely difficult to break.

It’s not that Li Yuanai is stingy, but that the Tang Dynasty is not enough to produce cement at the moment, and the technology of this era is not enough to support the construction of a 1,500-degree high-temperature smelting furnace.

The only material of cement is natural volcanic ash. This thing is used a little less and is necessary to build city walls.

Moreover, in his memory, China's volcanic groups are in Longgang, Jilin, Wudalianchi, Heilongjiang, Chahar Right-wing Hou Banner, Datun, Taiwan Province, Keshketeng Banner, and Xinjiang Ashkule. Unfortunately, they do not belong to the current Tang Dynasty.

Only when you take down all these places can you be extravagant.

Li Yuanai smiled and said, "Shangshu has not yet noticed the real power of this thing. Because it requires a lot of water to be mixed and absorbed, I call it cement. Its biggest advantage is that it can harden in water, so it is a powerful tool for building dams."

"Hardening in the water?" Yan Lide took a deep breath, then his eyes turned to joy, and said, "With this magical object, the dam is completed."

After a series of experiments, cement certainly can stand the test.

Da'an Palace.

Li Yuanai is giving a lecture to Princess Changle.

"When it comes to sketching, the most important thing is your own observation ability, and you should look at it more and think about it more. Whether it is painting people, objects or landscapes, they all start from real objects. Sketching must focus on light, the relationship between objects, and the drawing techniques of brushstrokes, and present the shapes observed by your eyes in a concrete and subtle way. Shape, color, lines, light and dark, texture, sense of quantity, sense of existence, space, and dynamics are all keys that need attention..."

Princess Changle listened very seriously, perhaps because of her talent and love.

Princess Changle's sketching level has improved very quickly, and the paintings drawn are almost the same as Li Yuanai.

What is crucial is that the masterpieces painted by Princess Changle make people feel strange, commonly known as artistic conception.

Li Yuanai himself doesn't have this thing.

He practices sketching simply to draw sketches. The things he draws can be the same as real objects, but lacks the so-called soul.

Princess Changle was able to give her paintings soul, even Li Yuanai felt inferior to that.

Maybe because he was about to leave to explore the terrain and repair the dam and sluice gate soon, Li Yuanai said it very general, and he talked about three or four lessons in one class.

Princess Changle was as careful as she asked, "Uncle Sixteen will leave Beijing in the short term? The last time she gave such a lecture was when Uncle Sixteen was ordered to go to war."

Li Yuanai nodded and said, "You have noticed it again. The next day I will set off along the canal and go down to the south of Jingxiang and Jiangnan for a field investigation. It will take at least half a year to go here..." He said, feeling a little reluctant.

Princess Changle is the woman he has come into this era, and she has all the characteristics of a goddess: fair skin, beautiful appearance, long legs. The key is that she has noble and elegant temperament, gentle and virtuous personality, and does not have the charm of the first princess of the Tang Dynasty. She is simply the best candidate for the lover in her dream.

It is just because of identity, it can only be viewed from afar and cannot be blasphemed.

Princess Changle was stunned and even revealed a little reluctance. She came to Da'an Palace to study sketches, and her life became much more fulfilling.

Painting and painting are indeed her biggest hobby, and the magic of sketching makes her yearn for surprise.

In addition to her pursuit of painting, Princess Changle also likes the extracurricular sessions during rest.

Li Yuanai often talks about interesting stories outside, which makes Changle, who lives in the palace for a long time, feels a different world.

The last time Li Yuanai went to the expedition for less than a month, Changle felt a little disappointed.

Now that I heard that he was leaving for at least half a year, I didn’t know what to say for a while.

Silence for a moment.

Suddenly, Changle couldn't help coughing twice.

Li Yuanai said: "The most important part of sketching is to sketch. Go and see nature. Depicting different people and different things will have different feelings. You are a princess and it is not convenient to enter and exit the street market, but the suburbs and mountains with few pedestrians are all excellent places to take pictures. Moreover, going out to play can also soothe your mood and be very good for your condition. But you have to bring a good guard and pay attention to safety. If you really want to have a prince, you must pull my skin."

Changle inherited the genetic disease unique to the Li family.

There has been no detailed information on this qi disease in history.

Later generations speculated that this qi disease is either asthma or heart disease.

No matter which one it is, it is an extremely difficult to treat emergency.

Li Yuanai does not understand this knowledge and does not know how to avoid it.

I can only tinker with some fun and strange things and tell some interesting things from time to time, so as to make a smile on my face, so that they can feel good.

Many times, the effect of a healthy mindset is better than taking medicine.

Li Yuanai suddenly remembered that when he first learned sketching, the teacher who taught him once introduced that sketching was the inevitable basis for advanced paintings such as watercolor, oil painting, printmaking, and carving. But he was not interested in learning, and only God knows what exactly it is.

Changle has this talent, and he may be able to integrate the two. He can't say that he will become a famous master of the generation, and he will still benefit from it.

What's more, the ancients didn't have many entertainment projects in their lives, and it was better to do something than to do nothing, so they said: "You can also try to incorporate the sketch into colors and draw it in the form of brush strokes. I don't know whether it will be successful or not, but you can try it."

Changle seems to have some insights.

It was almost dusk, and Changsun Chong came to pick Changle up and returned home.

At this time, Changsun Chong had been promoted to Secretary-General. On the surface, the Secretary-General was a dictionary and a book manager, but in fact, because he was always by the emperor, he was a close minister of the emperor and his status was extraordinary.

Especially Li Shimin loved the Changsun family and was very respectful to Changsun Chong, and had grown into the number one figure in the temple.

Because of Changle's relationship, they get along well.

Every time Changle learns painting, Changsun Chong would go around Da'an Palace when he gets off work and take Changle back to the princess's mansion.

"Princess is careful!"

Seeing Changsun Chong watching Changle get on the bus in a regular manner, he felt a strange feeling in his heart. He always felt that Changsun Chong was too respectful when he met Princess Changle, and it didn't look like a couple's attitude at all.

After sending Changle to the carriage, Changsun Chong talked to Li Yuanai for a few words and said goodbye to each other.

The next day, Li Yuanai rarely went to the Ministry of Works, but arrived at the Lizheng Hall early in the morning.

Now that Li Zhi has entered the Eastern Palace, Li Zheng Palace is usually left alone.

Xiao Yizi is already sensible and knows that his father and brother are busy with major events in the temple and have not asked for anything. He just reads books by himself and plays by himself to pass the time.

Li Yuanai's arrival made Xiao Xuzi's face full of smiles.

When you play by yourself, how can you have someone else to play with you?

Beast fighting chess, Gozi chess, flying chess, and Monopoly, Li Yuanai made one by one every previous birthday.

Li Yuanai didn't feel naive either and played with her all day.

At night, when it was about to close the palace gate, Li Yuanai reluctantly told Xiao Yizi that he was going to go far.

Little Snow pouted slightly, then smiled and turned into a crescent shape and said, "Brother Ninth told me that Brother Ai is a famous wise king in the world. Like him, he wants to do big things. I don't know anything, so I can only pray for you in the Lizheng Hall, wishing you peace and safety. You don't have to worry about Little Snow..."

Li Yuanai touched Xiao Yizi's head and said, "How could he not think about the cute little Yizi? This time I went out, you were the one I couldn't let go of the most. We agreed that every ten days, I would write you a letter and tell you a story. You have to reply well, don't forget your brother Ai."

Xiao Yizi clapped her palm and smiled, "How could it be, Xiao Yizi's handwriting is so good. Imitate the handwriting of my father, but my father himself can't tell it."

"Then let's pull the hook?"

Li Yuanai naturally stretched out his fingers.

"Okay!" Xiao Yizi said happily: "Hook and hang it, and it will not be changed for a hundred years!"

Li Shimin walked in from outside at this time, and he also knew that Li Zhi moved out of Lizheng Hall, and the loneliest thing was Xiao Yizi, who would come to see him every day.

Li Yuanai asked for a good question first.

Li Shimin nodded and said, "Let's leave tomorrow?"

"Yes!" Li Yuanai said: "I have already made a reservation with the Ministry of Works. I will take a boat south to explore the situation tomorrow morning and start construction of the dam in autumn."
Chapter completed!