Three Kingdoms, at the beginning of the game, recognize the thief as the father, hit the spectacle,

……

In this way, under Wei Xian's desperate advice, Zhang Yan finally failed to start the construction plan of the Roman waterway.

It's not that Wei Xian is too lazy or unwilling to accept Zhang Yan's orders. Zhang Yan also knows in his heart that this sewer is not like a library or a sundial. Its scale is simply beyond the reach of a generation.

In the original world, the Roman sewer, as the cornerstone of the entire city of Rome, has been built and expanded for more than 400 years, and finally formed the Maxima Arena as the core, the Maxima sewer as the backbone, and filled with Marl The Sri Lanka field system is a complex structure of flesh and blood.

This hundreds of years project, not to mention that Zhang Yan only has a population of one county, even if it was built with the whole country of the Eastern Han Dynasty, it is not a simple matter.

This is really embarrassing.

Not to mention anything else, it is just a simple sewer system in the city. It is necessary to dig all the roads in the current Wancheng, and lay waterways under these roads to collect all the groundwater and discharge it outside the city. Low-lying places.

Things like excavating soil in this whole project may be relatively simple. After all, Lujiang has now popularized all kinds of iron tools, but when it comes to mining, grinding and transporting stone materials, it can kill these workers.

With the help of gunpowder in mining, no matter how big the mountain is, as long as a hole is opened to detonate, there is always a method.

The broken mountain can be polished and transported back to Wancheng, the prefecture of Lujiang. This way, all the people carry it on their shoulders. Even with the help of oxen, horses and vehicles, it is enough to make the people of Lujiang very tired.

To put it more seriously, Zhang Yan may be given the reputation of violent taxation.

Not to mention, after the sewer system in the city is completed, there will be a field system with a larger scale and a hub center with a steel water tower.

These are all serious troubles.

But then again, there is always trouble.

Just like what Zhang Yan thought before, as long as he decides to try to build a purple epic spectacle at this time, he will definitely encounter various difficulties. mutter.

For the difficulties encountered during the construction of these wonders, it is enough to solve them.

The reason why Zhang Yan appeared here today is to completely solve the problem of time-consuming and labor-intensive large-scale masonry structures through the invention of cement, a brand-new composite material.

According to the requirements of the system, whether it is a large sewer built in the city or a field system built outside the city, it needs to be built with masonry structures.

It's fine if it's a small building. The blue bricks produced in China can solve many problems, but this kind of large-scale and long-term use of tens of hundreds of years of mega-structure must use a lot of stone.

The most famous feature of cement is that after being mixed with water and air-dried, it can produce cement stone with an internal crystalline structure. Using cement stone instead of masonry will be more than [-]% faster in terms of transportation difficulty and construction speed.

More importantly, the use of cement for the construction of sewers can also effectively alleviate the dilemma of insufficient craftsmen in Lujiang.

Although Lujiang has a large base of things like stonemasons, compared to the huge projects covering the entire city or even the entire county, these people are just a drop in the bucket.

In short, cement stone is a good building material, and cement is also a good adhesive.Whether it is to use cement to bond the whole stone or directly pour cement stones to build waterways, it will definitely reduce the original huge engineering volume.

With the help of cement, the whole project will no longer be as far away as before.

Chapter 40 Smash me!

"Ahem, well, you all come here."

"You should all know what to do today, right?"

Zhang Yan smiled and gestured to the two, and signaled Ma Jun and Wei Xian to come over to the mud kiln.

Beside him, there are already many strong men standing there with bare arms, ready to attack them anytime, anywhere.

These people are all non-staff personnel recruited by the Lujiang Science and Technology Department. Although they can't be called officials, they can be regarded as contract workers anyway. I can support my big family.

As for Wei Xian and the other two, they nodded when they heard the words:

"My lord, I did hear about it from Deheng. It should be a material called 'cement', right?"

"I don't know where this cement comes from, and is it really as you said, can be poured into a stone, indestructible?"

It has to be said that Wei Xian has also been under Zhang Yan's command for such a long time, and he has already become a qualified old fan.

After saying these words, he not only answered the general situation to Zhang Yan, but also paved the way for what he was going to say next.

The two sang together, and Ma Jun watched from the sidelines with his lips pursed in joy.

But Zhang Yan didn't care that much. Seeing that the two of them were ready, he smiled and pointed to the mud kiln beside him, and then began to direct the men behind him to get busy.

"Then, shall we begin?"

……

In fact, the method of making cement is simple and simple, but difficult to say.

To put it simply, even the "One Hundred Thousand Whys" published in the early days of the founding of the People's Republic of China recorded the simple method of making cement.It seems that people only need to throw stones into kilns and keep calcining, and the final white powder is cement.

But if it is more complicated, crushing, primary calcining, re-calcining, sieving, mixing... after these various processes, it is really not an easy task to make cement.

In the earliest historical time-traveling novels, cement is an artifact of historical time-traveling that is jokingly called the "three-piece set of travelers" together with gunpowder and glass. It seems that as long as the protagonist of the novel travels to various periods in ancient China, if he cannot If you rub these three things with your hands, it's like embarrassing the senior traversers.

But in fact, just talking about the method of making things like cement, Zhang Yan really...

……

He really knows how to do it, and he can do it very well.

After all, no matter how you say it, it was the dazed man who had done a lot of preparations for time travel in his previous life, wasn't he...

……

Standing there briefly recalling the steps of making cement, Zhang Yan waved his hand and ordered the men behind him to pick out a lot of white-colored pebbles and limestone from the stones on the side and put them together separately. .

The main components of these white-colored stones are calcium carbonate and silica. Under high temperature conditions, a large amount of calcium silicate can be formed, which is one of the main components of cement.

As for choosing white stone, there is another advantage, that is, the impurity content of this kind of stone is relatively less, and the cement produced is also purer, so it is better to control the quality of the output.

Just from a simple selection of materials, we can see that burning cement is far from as simple as most people imagine.

……

"Here, Ma Jun, please remember that the first step in making cement is to choose materials."

"When choosing materials, you must choose limestone with a white color. For example, some ores containing copper and iron cannot be used, otherwise it will affect the quality of the produced cement, and even cause safety hazards in serious cases."

……

Zhang Yan whispered something to Ma Jun who was at the side, and Ma Jun was standing aside with a small notebook, writing on it with a charcoal pencil.

As for Wei Xian, as a practical man, he simply stepped forward and picked up a few pebbles that Zhang Yan had selected initially, observed the characteristics of those pebbles, and then put them back.

……

After a while, when the first batch of white limestone weighing hundreds of catties was selected and stacked together, Zhang Yan pulled the two people beside him back a little, and then pointed at the pile of stones with his big hand, and turned towards the pile of stones behind him. The people commanded:

"Smash me!"

Give.I.hit.

The simple three words constituted an order, and it came out of Zhang Yan's mouth like this.And the coolies around them also seemed to have received a signal, and began to talk about the pile of pebbles on the ground crazily output by the hammer.

"eighty!"

……

"eighty!"

……

Zhang Yan silently counted the number of times in his heart, and soon, within a short period of time, those cobblestones were shattered into stone dregs the size of a finger belly under the vigorous bombardment of iron tools, and they were still under the continuous hammering Continue to smash.

Stretching out his hand to wipe the smoke and dust from his face, Zhang Yan just watched a group of people bombard the stone debris until the debris had been smashed into pieces like sand, and then he was born to stop them. Down.

"Okay, let's all stop."

Zhang Yan waved his hand to signal those coolies who were still sweating to retreat, while he stepped forward and squatted beside the stone chips, stretched out his hand to grab a handful, and twisted it lightly.

"Well... a little bit of cutting, but it's not serious, it's okay."

Standing up and muttering something softly, Zhang Yan turned around and gave instructions to the group of coolies behind him.

"It's almost like this. Come here and fill all the gravel slag into the furnace. Remember to spread it evenly. Don't pile it up together, and don't mix the soil on the ground."

"There are a few of you. You are responsible for carrying the charcoal fire. If you want the kind of high-quality coal that is fired, carry as much as possible."

"Finally... Ma Jun!"

Waving to the big boy not far away, Zhang Yan then asked:

"You should have prepared the dried clay crumbs that I asked you to prepare before, right?"

"Weigh about ten catties and sprinkle it into the furnace, and then let those people stir it before paving it."

Following Zhang Yan's order after order, soon, the backyard of the Science and Technology Department became busy again.

As for Zhang Yan himself, taking advantage of the busy time of those people, he called Ma Jun and Wei Xian aside, and began to teach them the key to the operation just now.

……

"Remember, both of you, although the firing of cement is cumbersome, the key steps are 'two grindings and one firing' in the final analysis. The calcined fillers are mixed together and ground again."

……

"Uh-huh."

……

"We don't have such good production conditions for the time being. The coarse materials don't need to be ground. Just smash the raw materials selected in the first step to the extreme. It looks like a pile of stone powder to the naked eye."

"After the stone powder is smashed, mix the stone powder with the dried clay and lay it in the mud kiln. This is the raw material that will be used for calcination later."

Chapter 41 Two Grinding and One Burning

"Reporting to the Marquis of the Kingdom of Wan, the material head has been arranged, and the charcoal fire in the furnace is almost piled up."

"Except for a few brothers who are still carrying graphite charcoal, the rest are waiting by the side. When do you think the fire will be lit?"

Zhang Yan was explaining to the two the key to firing cement, and the coolies over there were not idle, and quickly prepared everything according to Zhang Yan's request.

This time, Zhang Yan didn't choose a cheap, big bowl of charcoal, but directly asked the group of people to prepare high-quality coal to burn cement.

It is necessary to know that the firing process of cement is actually the process in which silicon dioxide and calcium carbonate in the raw meal react in a molten state to form calcium silicate and carbon dioxide.

The melting point of silicon dioxide depends on the purity, and it is often above 1000 two hundred degrees. Therefore, apart from high-quality coal, Zhang Yan really has no suitable way to heat the temperature in the mud kiln to such a terrifying level. .

For example, the charcoal used in ordinary people's homes can only be heated to a maximum temperature of about [-] degrees Celsius, and the performance of firewood is worse than that of charcoal.

In contrast, coal, that is, the graphite charcoal in Dahankou, can burn at a temperature of more than [-] degrees Celsius, which can be said to be the gospel of early smelting work.

At the same time that what Zhang Yan said was almost finished, a representative elected by those coolies ran up to Zhang Yan to make a report, and then retreated, huddling in the crowd as if intending to watch Zhang Yan's next move.