Outside the tent of King Xiao Wu, Queen Ma's cadres, including Tu Zhe, were watching Zhu Yan conduct experiments.

In fact, as long as the ratio of raw materials is mastered, there is not much technical content in other processes.

As an engineering student, Zhu Yan doesn't need the artifact of "Friends of Military and Civilian Talents", and he can also know cement well.

Quickly and accurately mix quicklime and clay in proportion, Zhu Yan put them into a sealed space and roasted them.

This is called "frying clinker......

Now for the experiment, he uses Queen Ma's copper cup. In the future, if he really gets on the right track, he needs to build several large copper sealed jars to fry.

The reason why copper cups are used is that although they are heated slowly at first, they can remain at that stage for a long time after reaching a certain temperature, even after the fuel is removed.

Frying cement clinker requires a high temperature of about 1,000 degrees, which is impossible for ordinary iron cookware.

After three quarters of an hour of long waiting, feeling that the time had come, Zhu Yan immediately picked up the lid of the copper cup with stone chopsticks with extremely strong thermal insulation ability.

He then quickly poured the clinker into a copper basin and mixed it with the iron ore that had already been prepared.

Next, all the ingredients are ground into a fine powder with a stone pestle.

Without modern crushing machinery, this process is quite cumbersome.

Fortunately, there was Tu Zhe, the commander of the Gongwei Division, who had super physical strength and endurance, to serve at the scene.

Not long after, with a "stop" order, Tu Zhe stopped sweating profusely.

Queen Ma and the others, who were also sweating hotly, saw that the copper basin had turned into a small pile of dry and delicate dust.

The temperature in the copper cup still hasn't dropped, and when it burned to the highest height just now, it almost suffocated the people around it.

Looking at this small pile of dust, Chang Qingxue was still inexplicable, humming hot air and asking, "That's it?" It's not that unusual. I'm about to suffocate people......"

Zhu Yan smiled at her, and without saying a word, he conjured a small bamboo box from behind him and fastened it to a flat linen cloth.

He began to scoop cement powder into it, and shoved some stones into it.

When the cement powder filled the entire bamboo box, he said, "Give me a spoonful of water!" Next, don't blink......"

Zhu Yan's playful gaze turned to his mother's face for a moment, took the water scoop handed by Yang Xian, and slowly poured water into the bamboo box.

While pouring, he also used a small shovel to smooth the surface of the cement powder, and the inside was slowly condensed.

Looking at the cement in this bamboo box, it quickly became a flat wet soil block, and there was a bit of a hard feeling, and everyone's eyes gave birth to a strange brilliance.

Chang Qingxue's childlike heart was still untouched, and she instinctively reached out to poke and poke, but Zhu Yan didn't stop it immediately.

When she tried a few times, withdrew her finger as if disgusted, and looked at her dirty finger, he said in fright.

"Let's go wash up. Otherwise, your finger will be so hard that it will be cut off......"

"Ahh

Seeing that her son didn't care about her daughter-in-law's safety at all, how could Queen Ma not know why, she immediately put on a straight face and found a place for her daughter-in-law: "Say!" What's the situation? If you don't make a real deal, let's see what your mother does with you......"

"Really! This thing is definitely more real than real gold. Zhu Yan smiled and hurriedly said. When it's dry, it's fun! ”

"That's it! Let's wait slowly. Don't all gather here, it's boring! Queen Ma glanced at her son again, turned around suspiciously, and walked away first.

Tu Zhe and Yang Xian also turned around in a few steps and slowly dispersed. They were also skeptical of this messy novelty.

It's not a complete whole!

Just a few pebbles mixed with some cement powder......

poke a hole with his fingers, and say that he can build bridges and pave roads?

However.

When three hours later, at dusk, everyone gathered in front of Zhu Yan's tent again, and there was an additional quarryman with a sledgehammer beside him, they were all dumbfounded.

Tu Zhe took out his saber, hesitated for a moment, and still slashed at the plaster block according to King Wu's instructions.

As a result, the split in two that he had expected did not materialize, leaving a mark on the stucco block that was deep in front and shallow in the back.

And Tu Zhe's hand holding the knife was also shocked a little numb: "So hard? Bluestone slabs are nothing more than that......"

"Don't be too surprised! This is the final setting stage, when it gradually hardens and no longer deforms. No matter how you cut it, you can't cut it. ”

Zhu Yan yawned and said, "Now, Master Chen! It's your turn. Take your hammer and smash the king hard ......"

"Hey! Come on. The master quarryman smiled innocently, smacked twice, picked up the bamboo handle and smashed it.

Unfortunately, the clods of ash on the ground only collapsed slightly, but there was no sign of cracking.

This master was not like Tu Zhe, and stopped to express his exclamation. He didn't believe in evil, and smashed several hammers one after another according to the cement block.

"Bang! Bang bang bang ......"

However, as if the clods were mocking him, the effect remained unchanged. Even, let the ground of the land temple under it collapse a little.

Queen Ma made the sound of the hammer tremble, and said irritably: "Enough is enough." Master, stop smashing and pulling! Look at this, if you smash it a few hundred times, the cement won't break......"

"Son! Why don't you tell everyone about it, what is the situation? Can this cement block really be harder than the bluestone pavement? She looked at Zhu Yan curiously.

She actually wants to find out, how does her second child's heart grow?

Why do you have so many wonderful ideas when you are young......

Zhu Yan waved his hand and said, "It's not that the cement block is powerful, but the cement block with stones is powerful." Mother! Yang Governor's Mansion! You have to see its plasticity first......"

"So you say? Bluestone slab road bridges, as far as I know, are only a few Zhaozhou Bridges, etc., can have a load of 100,000 catties, and most of them are only enough to bear 50,000 catties. ”

After a pause, he continued: "And the roads and bridges paved with cement and stone are enough to bear the weight of eight to one hundred thousand catties, and they will not crack in one or two hundred years......."

On the issue of the service life of cement, it is not Zhu Yan who is boasting.

But he understands that the load of this land transport vehicle, including the later red-coated cannon, can not jump out of the Ming Dynasty of ten tons at most, and the service life of the cement and gravel road can definitely reach such a long time.

"Cement has a wide range of applications! Even when combined with red brick or steel, it can enhance its durability......"

Zhu Yan finally summed up loudly: "If you want to build every state capital and county, cement is an absolutely indispensable weapon!" ”