Li Er really couldn't imagine that it was just gray, sand and water mixed together.

What was originally soft became indestructible after one night.

"This kind of cement is the first time I've seen it. It's truly indestructible!"

Li Er couldn't help but sigh:

"The world is so big, there are so many strange things!"

Zhuang Zhou thought, this is probably only C15 strength!

There are fourteen grades of concrete.

Above C50, it is high-strength concrete.

Even military concrete used in building military defense bases can reach C80.

That's what it means to be truly indestructible.

I was shocked for a while.

Li Ercai suddenly thought of something:

"If this is used to build a city wall, wouldn't it be unbreakable?"

You know what's good!

And this is without the steel cage!

Otherwise the intensity would have to be multiplied several times.

"Besides, Brother Qin, this cement block is not afraid of fire, water, swords, guns, or anything like that."

As Zhuang Zhou said this.

Li Er believed it.

But what he is most concerned about now is where to get the cement dust?

"Zhuang Zhou, do you know how to make cement?"

Now that we have a method to make salt, we now have finished cement.

Logically speaking, there must be a way to make cement.

Zhuang Zhou didn't plan to hide it, as cement production was something he would have to do sooner or later.

"Brother Qin, to be honest, I do know how to make cement."

Zhuang Zhou smiled and said:

"However, the manufacturing process of this cement is quite complicated and requires specific raw materials and certain techniques."

When Li Er heard this, a hint of excitement flashed in his eyes.

He knew very well the importance of this magical cement to the Tang Dynasty.

This has a wide range of uses!

In addition to building roads, bridges and houses.

It can also be used to build city walls.

In this way, we can resist the Turkic cavalry.

This is what Li Er cares about most.

So he immediately asked:

"Zhuang Zhou, can you teach me how to make cement?

Whatever reward you want, I can grant it to you!"

Zhuang Zhou nodded and said:

“Can I provide a method for making earth cement?

However, in terms of strength, it cannot reach the quality of this cement.”

Due to technical conditions, we can only make earth cement first.

Ural had already given technical guidance on the production method.

The main raw materials include limestone, clay, iron ore powder, etc.

Iron ore powder is also simple.

The clay from deep inside was taken out, dried, and ground into powder.

This clay is rich in alumina and silica.

This is called aluminosilicate.

These raw materials need to be processed by crushing, grinding, etc.

These raw materials are then mixed in a certain proportion and fed into a raw mill for grinding to produce raw meal.

The quality of raw materials has a vital impact on the quality of cement.

After grinding, the next step is to burn the material.

The raw material is fed into the cement kiln and fired at high temperature to cause a chemical reaction to produce clinker.

Clinker is the main component of cement.

Its quality directly determines the strength, durability and other properties of cement.

The last step is to mix the burned clinker with an appropriate amount of gypsum powder.

This is to speed up the setting of the cement.

Then it is sent to cement mill for grinding to make cement.

During the grinding process, an appropriate amount of grinding aids needs to be added to improve the fineness and uniformity of the cement.

Cement mills definitely don't exist in this era.

But when Zhuang Zhou finished speaking, Li Er said that the Military Equipment Bureau had special molds that could solve the problem.

Zhuang Zhou didn't know what kind of mold it was.

We can only wait until we go to the Arsenal tomorrow to check it out.

Finally, Zhuang Zhou concluded:

“When making earth cement, it is important to note that all parameters need to be strictly controlled.

Such as raw material ratio, firing temperature, grinding time, etc. ”

When these things were told, Li Er could only understand the general idea.

But as long as Zhuang Zhou provides technical guidance, the craftsmen in the Military Equipment Bureau will definitely be able to make it.

This is cement!

It is very useful.

Once it is truly mastered, the entire Tang Dynasty will be completely transformed.

What an achievement that would be.

Since ascending the throne, Li Er has repeatedly wanted to achieve results.

Let the old man take a good look.

Apart from Li Jiancheng, he can also be a good ruler of this country.

He really wants to improve.

Think of this.

Li Er became more and more excited and immediately instructed:

"Let's go to the construction supervisor now and start making earth cement tonight."

“???”

Zhuang Zhou was stunned for a moment and glanced at the sky.

Then he asked uncertainly:

"Brother Qin, do you want to go to the Directorate of Works now?"

"Yes, I'll stay up all night with you tonight and get this mud and cement out first."

“…”

All right!

Now I understand.

But you are a workaholic, and I am not!

I'm here to enjoy life.

There are so many girls waiting for me in the mansion!

Zhuang Zhou feels so miserable!

It's getting dark soon.

and.

He hasn't had dinner yet!

Without further ado, Li Er dragged Zhuang Zhou to the Directorate of Works.

…

The commander will be in charge.

It was founded in the early years of Wude.

It is on par with the Shaofujian, Guozijian, Junqijian and Dushuijian.

It is one of the nine temples and five prisons.

He was in charge of the repairs and maintenance of palaces, city walls, bridges, boats and vehicles.

It's almost like a big workshop.

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