The raw materials are calcined at high temperature, ground into powder, and then fried in a pan.

Finally, lime powder, clay powder, coal slag powder and gypsum powder are obtained.

At this point, all the raw materials needed for earth cement are available.

The next step is the key parameter ratio.

Zhuang Zhou yawned loudly.

"Lime powder accounts for 40%, clay powder accounts for 30%, gypsum powder accounts for 20%, and coal slag powder accounts for 10%."

After that, he explained the functions of various raw materials again:

"Powdered lime is used to make cement more sticky."

“Clay powder is used to increase the hardness of cement.”

“Gypsum powder is used to enhance the bond and strength of cement.”

“Cinder powder is used to increase the hardness and durability of cement.”

Zhuang Zhou said that someone had already been recording it nearby.

These were all specifically instructed by Li Er.

If you dare to leak it, your whole family will be killed!

Add the four powders into a wooden rotating barrel and mix them evenly.

The result was earth cement.

then.

Bucket after bucket of cement began to be produced.

In the end, five wooden barrels were filled.

But Zhuang Zhou had no idea what the effect would be.

He is honest.

Just say it directly if it might not succeed.

So as to prevent Li Er from causing trouble later.

However, Li Er was full of confidence.

He already found the production process incredible.

The next step is to experiment and see the effect.

After thinking about it, Li Er suggested that they finally make a stone pillar.

The river sand and gravel are all on site.

Only the wood panel frame is missing.

Li Er found several strong craftsmen and followed Zhuang Zhou's instructions.

A wooden frame was made that was three feet deep, long, and wide.

Then.

They began pouring the prepared earth-cement mortar into the pit.

I'm too lazy to use a vibrator!

Just use a wooden stick to stir it carefully until all the soil and cement are evenly filled in the wooden frame.

Next.

Wooden boards and stones were used to compact the cement mortar to make it stronger.

Finally, sprinkle some water on the surface of the earth cement to keep it moist.

Then all you can do is wait.

Time flies.

Before I knew it, it was almost dawn.

Li Er stayed at the construction site for the whole night, full of energy.

All the officials were already exhausted by this time.

Everyone was yawning.

It's obvious.

I never stay up late to work overtime like this on weekdays.

Li Er often reviewed memorials all night long.

I've become accustomed to it.

It’s Zhuang Zhou.

The guy just lay down on a wooden board and fell asleep with his clothes on.

Speaking of which, this was a bed that Li Er specially arranged for Zhuang Zhou to have temporarily.

There’s no way!

This is the most advanced technical talent in the Tang Dynasty.

I dare not treat you unfairly!

Now that the effect of the earth and cement has not come out, we dare not let him go.

When Zhuang Zhou woke up.

It was already bright outside.

Zhuang Zhou yawned, and then heard Li Er say:

"You're finally awake. Come and take a look at the cement. What's become of it?"

"Okay! Ha~~~"

While yawning, he walked to the concrete pillar to check it out.

He stretched out a finger and pressed it.

It's completely hard!

Counting the time, it has been more than seven hours.

The initial setting time has long passed.

However, Zhuang Zhou was still a little unsure about the final setting time.

"How was it? Was it successful?"

Li Er was obviously more anxious than Zhuang Zhou.

"It should be successful, but I don't know how strong it is yet!"

"What should we do then?"

"We have to wait a little longer."

After saying that, he stood up, looked at Li Er and asked:

"Why don't we go have breakfast first?"

"Yes, yes, it's time for your Majesty to have breakfast."

Without waiting for Li Er to respond, Supervisor Liu Rengui was the first to agree.

Then, the other supervisory officials echoed each other.

This is like a general amnesty!

Li Er was no longer so anxious and said with a smile:

"Okay! There's no rush."

However, before leaving, Zhuang Zhou picked up some water and sprinkled it on the plant for maintenance.

These are also recorded one by one.

…

The waiting process was long and anxious.

In the blink of an eye, it was noon.

After breakfast, Li Er returned to the workshop to guard it.

Someone came from the palace and said that many court officials had important matters to discuss.

They were all pushed away by Li Er.

Now we are guarding this hardening stone pier.

It seemed as if time had slowed down abnormally at this moment.

In fact, it’s not just Li Er.

Even Zhuang Zhou was full of anticipation.

I hope this stone pillar can prove that his efforts were not in vain.

It is unrealistic to produce high-quality cement of the kind that will be produced in later generations under current conditions.

But if this kind of earth cement is really successful.

It will also bring earth-shaking changes to the Tang Dynasty.

This is already a groundbreaking event.

Finally, after an unbearable wait.

The stone pillar has become extremely hard.

Zhuang Zhou had the wooden boards removed.

Li Er excitedly came forward and knocked on the stone pillar with his hands.

“Hard enough!”

After saying that, he and Zhuang Zhou looked at each other and smiled.

"Looks like it was a success!"

Zhuang Zhou also felt extremely relieved.

A smile of pride and satisfaction filled his face.

The other officials also obviously realized the importance of cement.

Such a good opportunity to flatter someone would naturally not be missed.

"Congratulations, Your Majesty! Obtaining this cement is truly a blessing for the Tang Dynasty!"

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