After repeated tests, the importance of brick kilns has completely refreshed the cognition of these indigenous people.

For the Industrial Department, the emergence of excellent building materials is definitely a blessing!

Among the drawings exchanged by Ye Xuan from the faith value store, in addition to the construction of brick kilns, there are also two types of brick firing methods.

Neither of these two types of bricks is named, and Ye Xuan directly takes the color as the basis.

One of the bricks is dark red, which is commonly used in Ye Xuan's hometown to build houses. It is called red bricks. It is made after drying at a high temperature of 900 degrees.

The required materials are mainly clay, shale, etc., and can be seen almost everywhere in the area between Heishui City and Heishui River.

Moreover, Ye Xuan also plans to re-plan Heishui City, so facilities such as sewers must be needed. The digging of soil can be used to burn red bricks, so there is no need to worry about insufficient materials at all.

Another type of brick is navy blue, which is several circles larger than red bricks. Eight red bricks are stacked, four up and four down, and the volume can be topped with a navy blue brick.

Ye Xuan named it bluestone brick, which is definitely a good thing to build city walls.

However, the materials used for burning bluestone bricks are much more complicated than those used for red bricks. Fortunately, the blue mountains are adjacent to them, and all the materials required can be found there.

At present, the walls of Heishui City are mainly made of rammed earth. To a certain extent, they have a bit of reinforced concrete, or reinforced concrete is inherited and developed from ancient architecture.

First, a frame is formed with sand and stone and wood, then filled with a mixture of loess and similar viscose substances, compacted and tightened, and after drying, it becomes a city wall.

At least the height of the city wall can be built, it depends on how high the framework built by civil engineering is.

After hearing the explanation from Lu Mu, Director of the Industry Department, Ye Xuan couldn't help but think of a food that was somewhat similar in terms of operation principle and very demanding technology.

Cut cake!

Although it is just a small piece of cut, the weight is definitely beyond imagination.

This rammed earth city wall is the principle. From the outside, it seems a bit shoddy, but only when you really attack the city, you will find that this thing is so strong!

However, Ye Xuan believes that the city wall built with bluestone bricks is not only stronger than the rammed earth wall, but also more defensive fortifications can be built on the city wall.

At present, except for the people who can stand on the walls of Heishui City, there are no other things to do. You should know that there are many good things in the faith value store waiting to be redeemed!

Not to mention anything else, just set up a few crossbows on the top of the city. As long as the enemy general dares to show up, shoot one wave first!

In the era of cold weapons, top-down terrain was very advantageous.

There was an old saying in Ye Xuan’s hometown in ancient times: One army defends the city and attacks three times!

In every tough battle in history, the siege side would pay more than the defender side, and even if the number of people is several times that of the other side, it may not be able to attack 100%.

When Ye Xuan decided to build a new city wall, he had already conducted an investigation, and the targets were mainly siege equipment from this world.

For example, if a ladder or something like this, how many meters can it reach? Then the height of the new city wall only needs to be one piece higher.

"Master, the craftsmen encountered trouble in the process of building the new city wall." The first sentence Lu Mu, director of the Industry Department, said when he saw Ye Xuan was this, and his anxious expression was beyond words.

"Oh, what's the trouble?" Ye Xuan came to a cart of bluestone bricks, reached out to touch it, the surface was very rough, and he patted it with his hands. The heavy feeling was very reassuring.

"Report to the master, it's mainly about adhesion!" Lu Mu replied with a deep brow.

"The effect was very good when building the station, but now it is not possible to build a new city wall."

"A stack of more than five bluestone bricks will become less solid, and may not have a big impact in a short period of time, but if it is more than one or two years..."

Lumu didn't finish his words, but the meaning was very obvious.

As long as the time goes by, even under normal circumstances, problems will occur in the city walls, not to mention that the enemy attacks and it will not be surprising that it will collapse!

The inn is a house, and red bricks are used when building it. There will be no problem with the local adhesion method, but the bluestone bricks are built in the new city wall...

To put it bluntly, the existing adhesion method is not suitable for bluestone bricks.

"This is simple, I know a way!" Ye Xuan said casually.

"I would like to ask you for advice!" Lu Mu was worried about this. He couldn't use such a good bluestone brick, and he felt really uncomfortable.

Now that Ye Xuan said this, not only Lu Mu, but also other officials and all the craftsmen were shining.

"You can make a pot here first and cook water. I will come when I go."

After Ye Xuan said this, he turned over and floated away, leaving behind a large group of people who were already confused.

"Why do you have to cook water in a pot? Are you going to have a meal?"

"No, Lord Lord said just now. He knew a method of adhesion, which should be necessary to use hot water during the process."

"Well, it makes sense for you to say that. It's probably what it means. Let's get ready quickly! Tsk tsk, I have to say, our Lord knows so much!"

"That's right, we can have a good day today, thanks to Lord Lord."

"By the way, we are here to build the city wall. Where can we find the pot?"

"This problem...it's better leave it to the Director General to solve it."

In the end, Lu Mu spent a lot of money out of his own pocket and bought several pots from nearby families.

Digging a stove pit in the wild is definitely a trivial matter for the Industrial Department. When Lumu just came back with a few pots, ten stove pits were already ready.

The pot is placed on the stove pit, water is released, and the fire is created. Next is to wait patiently for the Lord.

About an hour later, Ye Xuan appeared in front of Lu Mu and others again. Compared to before, there was an additional carriage full of cabins behind him.

"Does the water boil?" As soon as he approached, Ye Xuan asked loudly.

"Report to the Lord, it's already boiling." Lumu replied immediately.

"Okay, move the things on the carriage down!" Ye Xuan raised his hand and pointed to the carriage he brought over.

Lumu immediately couldn't wait to direct his men to move the things from the carriage down.

"Lumu, go and have someone get some lime," Ye Xuan ordered.

Lime is also a common construction material in this world, and this is the existing adhesion method.

"Yes, Lord!" Lu Mu didn't look like the director in charge of the Industrial Department at this time, just like Ye Xuan's followers, and he was very obedient to call out his two men to get lime.

At this moment, a mistake occurred while carrying items on the carriage. One of the bags fell on the ground and broke a hole. In an instant, the things inside were scattered all over the ground.

When Lu Mu and others saw it, they were stunned.
Chapter completed!