After last night's in-depth exchanges, Yan Kejin found that her princess really had a lot of interesting content hidden in her head.

As long as you don't annoy her.

"When you're done for a while, I'll walk around with you. Don't you want to go to the south to see? Is the first stop to Yong County? ”

Yong County is Nanning, this Xu Yin knows.

She turned to look at him, "Aren't you busy?" ”

Isn't hematite in full swing? Isn't it necessary for him not to keep an eye on such an important matter?

"So when you're busy for a while, the princess will wait for the king, right?" Yan Kejin put a piece of wine-stuffed fish into her bowl and met her gaze with a smile.

Xu Yin lowered her eyes, her eyelashes trembling slightly: "Actually, I'm also quite busy during this time, at least I won't be free until the end of spring ploughing." ”

"Then we'll leave in early April."

As a result, it didn't work out in early April.

When digging iron ore, an associated limestone mine was discovered.

When Yan Kejin came back from the mine that day and had dinner with her, she couldn't help sighing: "How good it would be if it were all ochre, it was a waste of a small hill." ”

Unfortunately, the amount of food that night was less than half of usual.

When Xu Yin heard the white and easily broken stone in the blue, her heart moved: Could it be limestone?

Limestone is one of the associated minerals of iron ore.

So, the next day, she followed the prince's frame to the mine, recognized it as limestone, and was happy.

That's good stuff!

Limestone can be used to make cement, and the calcined lime is hydrated lime after it is cured.

The use of hydrated lime is too wide, the most common is building materials, it can also be used as a fungicide, and the trunk is coated with hydrated lime slurry to prevent insects.

She didn't hesitate to spend 500 points and exchange a cement recipe with the system.

To make cement, in addition to limestone, raw materials such as clay, quartz sand and iron ore powder are also used.

Clay is relatively easy to find.

However, the quality of the clay is good and bad, and when Xu Yin mobilized his guards to dig clay on the bank of the river and at the foot of the hillside, he accidentally found a mountain made of kaolin.

Kaolin is white clay, which is the most widely used clay and has the best quality after firing porcelain.

The famous JDZ porcelain is made of kaolin.

Limestone is there, kaolin is found, iron ore powder is ready-made, so what's the reason not to make cement?

It doesn't matter if you lack quartz sand, the sea is just in front of you, so it's a big deal to use the sand after the waves, which is everywhere, and the composition is the same as silica, so you can use it.

The raw materials are ready-made, and the shipbuilding business will be put aside first, and Xu Yin will compete with the cement in the neat back garden.

The first time the proportion was not grasped well, the hardness of the cement made was not enough, and the weight collapsed softly.

The second time the hardening was too much and cracked.

The third time I summed up the experience of the first two times, and finally succeeded!

Xu Yin poured a cobblestone path in the back garden into a cement road.

When the cement hardened successfully the next day, she happily stroked her palm: "Please come to the prince!" ”

Yan Kejin has been staying at the mine a lot lately.

After the first iron was smelted, it was forged by blacksmiths who had signed a death contract.

Some of them were beaten into iron pieces to make farm tools, and some of them were hammered and forged a batch of weapons, and the iron was sharpened like clay, which can be called superior.

Now that he is staying in the house, Xu Yin can't wait to share the good news of cement with him.

As soon as Yan Kejin came, she was led to the cement road by her own princess, and her expression was full of sorrow:

"How? I said limestone is useful, right? You still think it's the nest of the iron ore. Use it to build roads, and the carriage won't run upside down, do you believe it? ”

Building a road is the first step, and she also wants to use it to boost the real estate industry in Nanban.

There is kaolin, and it is not a dream to build a kiln to burn bricks and tiles.

These new workshops need to recruit people, and the people will have money to work on, and when they earn money to buy bricks and tiles, every family will live in a brick house, which is much stronger than a wooden, bamboo, or adobe house.

There are many earthquakes in the southwest.

Although the people of this era thought that the turning of the earth dragon was a punishment from heaven, they superstitiously believed that the heavens wanted to punish them, and there was no way to hide. But in the end, it's a natural phenomenon, so why not work hard if you can resist it?

The farther Xu Yin thinks, the more ambitious she becomes.

Yan Kejin really didn't expect that a shovel could chisel down countless pieces of limestone, and make cement so firm and hard.

The princess said that in addition to limestone, the clay, gravel, iron ore powder and slag that can be found everywhere in Nanban are negligible, and the cost is negligible, and it is indeed feasible to build roads.

"Then start with the capital city, and the roads leading to the counties are poured with cement. Wait for all the counties in Nanban to be connected to the cement road, and then build a wide road for horse-drawn carriages on the mountain road connecting to the Central Plains. If you can't cultivate the official road here, let's repair it ourselves! ”

Yan Kejin was very happy, and the dinner was placed on the cement road in the back garden, and the lanterns were lit when it was a little dark.

He also asked the housekeeper to bring the plum blossom brewed from the first snow in the jar he treasured, saying that he wanted to celebrate with the princess.

Although Xu Yin was a little speechless, she still agreed with a smile.

In the faint twilight, the couple tasted wine, tasted delicacies, and looked forward to the bright future of the cement road leading to every corner of Nanban.

Xu Yin doesn't drink much, and she can still get drunk with a glass of red wine, not to mention the plum blossom brew with a higher degree than red wine.

Before the table was removed, the stamina of the wine came up, holding her cheeks and pouting her moist red lips, and asked Yan Kejin when she would take her around Nanban.

"I want to explore every county in Nanban, if you don't take me there, then I'll go by myself."

"Go! When the king arranges the affairs at hand, he will accompany the princess! ”

"I want to go to the beach, collect shells, eat seafood, walk barefoot on the beach......"

“…… Good. ”

Although I don't understand what's so fun about walking barefoot on the beach.

"I still want to go out to sea by boat and catch lots and lots of seafood......

"Okay."

"I still want to ......"

"It's all going to happen. Now, it's time to think about this king. ”

He picked up his wife and strode back to the room.

Fortunately, after the house was completely renovated, there was a bedroom shared by the couple, so it was not used.

……

When King Jinnan settled down the affairs at hand and wanted to take the princess on a trip, Xu Yin said that he would have to wait.

There are no official roads in Nanban, and the roads in each county are all opened by the government for conscription, and the main counties and counties are indeed open to roads, and there are more people walking and it is relatively smooth, but more roads are sheep intestine paths, and horse-drawn carriages can't run.

Now that there is cement, Xu Yin is not in a hurry to go out, and will go when the cement road from Fucheng to Yong County is opened.

Before the Dragon Boat Festival arrived, she wanted to make a compass.

There is indeed magnetite under the hematite, and the reserves are not large, but it is more than enough to make a batch of compasses.

With magnetism, Xu Yin couldn't help but think about the whole solar motor coming out.

The Nanban water system is well developed, and with electric motors, hydroelectric power generation can be easily realized.

When electricity is connected, mining machines and road rollers that can make industrial production more convenient, as well as spinning machines and looms that improve people's livelihood are no longer just dreams.

Thinking about it, she felt a little floating!