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

Until now, three days later, the row of cement and stone walls are no different from real stones when they look and feel.

Even if squeezed and kneaded as crowded as before Wei Xian, there will be no change.

This time, Zhang Yan and others did not come empty-handed as before, but put on some tools for testing.It's just that before everyone put down the things in their hands, Wei Xian stepped forward again, and squeezed again against the pure cement stone wall where he had made a handprint before.

This time, what was conveyed to his hands was no longer the somewhat soft feeling, but an incomparably solid and firm feeling.

"My lord, this thing really has something to say. In just two days, the previous cement has hardened into this shape. It seems that using this thing to build a sewer is really a suitable way!"

Without further ado, everyone started working on the concrete and stone walls.

This time, Zhang Yan came here mainly to test the strength of these cement walls and test their load-bearing capacity.Weighing this thing is the easiest, just place a wooden board flat on the concrete wall, and then add weight to the concrete wall with your eyes closed.As for strength, according to the current technical level of the Eastern Han Dynasty, if you want to standardize and quantify such indicators, you really have to use your brain a little bit.

After all, everyone knows that if you want to know whether a wall is strong enough, the easiest way is to hammer it with a hammer to see if you can send the wall away with one blow.

But this matter is easy to say, but different people have different skills, and even the same person swings the hammer twice with different strengths and angles, so it is difficult to do a completely standard controlled experiment with human resources.

In the end, Ma Jun thought of a way, which allowed everyone to continue their experiments.

If you want to ensure that the force and angle of force are the same every time, the easiest way is undoubtedly to use the same heavy object to fall naturally on the wall at the same height, and this kind of thing is also very easy to find in the Technology Division— — As for the Lujiang [-]-type artillery currently being produced, the standard artillery shells used for the artillery are large iron balls with a thickness of seven or eight centimeters, and a rough estimate weighs nearly ten catties.

As long as the shells of those artillery are placed in the air and let them fall freely, the power is not much worse than that of an adult swinging a hammer with all his strength.

Just do it, and under the busy work of everyone, soon, the brackets used to release the ammunition and the projectiles themselves have been brought to the backyard of the Science and Technology Department.

There is nothing to say about the ammunition itself. It is a ten-jin iron ball, each of which looks similar.

As for the bracket, in order to achieve better test results, Ma Jun gritted his teeth and stomped his feet, and simply borrowed a ladder for siege from the arsenal next door.

This cloud ladder is seven or eight meters long, and it can reach a height of more than five meters at the highest angle. It can only be seen during sieges.

Now it seems that such a "monster" appears in the city, not to mention Lujiang, it is the whole big man, maybe this is the first time.

……

"Huh, well, let's use this."

"The ladder is high enough, and the force of the shells is almost enough. What's more, there are wheels under the ladder, so you don't have to move the stone walls when you test it, which is a lot more convenient."

"Here, you guys, hold up the ladder, pick one with a steady hand, and prepare to go up and throw the shells."

……

Panting, he handed over the ladder he had just borrowed to everyone, and Ma Jun directed everyone to carry out the test with some excitement.It was as if a door had been opened in his mind now, and novel ideas couldn't stop coming out, making him unable to help but want to step forward and make a few gestures himself.

Behind him, during the whole process, Zhang Yan smiled and remained silent without intervening, just watching a group of people busy there.

Build the ladder, prepare for the experiment...

Zhang Yan looked back and forth at those people.He naturally knew how to carry out this experiment or test, and the issue of the intensity of the test that made everyone embarrassed was not a big deal to him.

If you have to say it, it is the level of high school physics calculation problems.

However, in this process, Zhang Yan still did not choose to intervene.In his eyes, people like Ma Jun and others need to exercise, and judging from the results just now, the long-term exercise has been quite effective for everyone.

He is satisfied.

……

"boom--"

"No problem, next one!"

……

"boom--"

"No. [-] is fine, the wall is smooth and there are no cracks, next one!"

……

"boom--"

"Number Six is ​​fine—wait! Let me see!"

"Sir, there is a small pit at the top of the No. [-] concrete wall, and the gravel has been smashed!"

……

Reports came from the front one after another, and the final result was as expected by Zhang Yan. Most of the cement walls withstood the test of an iron ball with a diameter of about [-] centimeters, and when it was dropped at a height of five meters, Except for the "No. [-] sample" with too much sand and gravel content, which had an obvious pit, the remaining five samples did not show obvious damage. In terms of strength, these cement stone walls are still passable.

Another point worth noting is that, in addition to the "concrete" mixed with sand, the wall made of all cement also withstood the test of iron balls, and it was not as fragile as the rumors said. , this was beyond Zhang Yan's expectation.

It's just that in another test, the test of weighing capacity, the performance of these cement stone walls is not so satisfactory.

In more economical words, except for the concrete configured according to the standard ratio of cement and sand and gravel of 1:2.5, almost all samples could not withstand excessive gravity pressure, and the entire experimental group was almost wiped out.

First of all, the No. [-] contestant was unable to hold on, that is, the "pure cement stone" that was all made of cement.Pure cement may still be able to compete with its other brothers in terms of hardness, but when it comes to stress testing, the disadvantages of not adding additional fillers are exposed.

On the wooden board placed on the top of the cement wall, Zhang Yan just ordered four big men with big arms and round waists to stand on it. It is estimated that they only weighed more than 600 kilograms. The crowd above the test were so frightened that they jumped around and almost fell off the board.

The test results of several other samples were not satisfactory. Either they could not withstand the high pressure and caused fracture, or the cement ratio was too low, which caused the cement stone to be not viscous enough. They deformed under high pressure just after bearing a few hundred kilograms. A sign of brokenness.

Chapter 46 At the limit...

You know, there is no such thing as steel bars in the current big man, and concrete is really just concrete.

For example, for Lujiang, whose output of high-quality steel is barely enough to supply the army, it is absolutely impossible to cast a large amount of high-quality steel into steel bars for Wei Xian to build buildings.

Maybe wait a few more years, after Lujiang's smelting level is further improved, high-quality steel will gradually replace wrought iron as the main product of the steel factory. May be born on the land of the Han Dynasty.

As for now...

According to the results of the experiment, only the No. [-] sample can barely be used as a building material in the construction of Lujiang in the future.

"Huh, all right, that's it."

"As the saying goes, the cement is about the same when it is three years old. Although three days is only enough for him to condense to about [-]% of its strength, if a batch of data is simply screened, this kind of experiment is enough. .”

"Wei Xian, if this kind of material is supplied to you on a large scale, it should be much easier to build the entire Lujiang canal this time, right?"

In the end, he made a conclusion on the results of the first experiment. While Zhang Yan created an excellent building material for the Lujiang River, he also proved to Wei Xian that the entire Lujiang County water conservancy system, at least as an outdoor part of the Shennong Canal There is absolutely no problem in building a water conservancy system with the current Lujiang manpower and material resources.

Beside him, Wei Xian no longer looked helpless as before, but looked at the large and small cement samples on the field with great interest, and went up to touch the residue from time to time, take a look.

He and Zhang Yan have different concerns. Although from the perspective of building construction, only the No. [-] cement and stone walls can meet the current needs of the Lujiang sewer, but the building is not just a sewer...

In the experiments just now, different grades of cement showed different properties. Those cements with extreme proportions may not be directly used to build houses, but they can be used for paving roads, bonding waterproofing to building seals, etc. Functionally, these materials are fully up to the task.

According to the craftsmanship handed down by the Chinese ancestors, there are currently two main types of adhesives used as building adhesive materials. One is the tung oil used by Qin Shihuang Yingzheng when he built the Great Wall, and the other is the tung oil used by Wei Xian in the past. When Luoyang led the team to build the wonders, it was used to glue the thick glutinous rice paste used to glue the white marble.

These two materials are naturally excellent as adhesives, but they both have their own disadvantages, that is, tung oil bonding is not waterproof, and it is easy to collapse under long-term exposure to the sun and rain. Carry out maintenance; while the thick glutinous rice slurry is slightly better in waterproof performance, but it is not so strong. Once the external impact is too large, the bonding will be broken.

It can be said that both of these are not very suitable materials for the construction of sewers.

And the pure cement just now...

Although its weighing strength is very poor, if it is used as a sealing and waterproof material, it is obviously much better than the existing tung oil and rice milk.

What's more, Wei Xian even thought about whether this new type of material could be combined with the green bricks and green tiles that China has been using since ancient times, so as to lower the difficulty of building construction by another level.

But obviously, he was not the only one who thought of this point, beside Wei Xian, Zhang Yan also thought of a place with him.

……

"Oh, by the way, I have a suggestion, which may not be easy to use, but Wei Xian, you can try it."

"You can prepare some green bricks, and use cement to build the places that need to be waterproofed, and use blue bricks to build up the places that don't need to be waterproofed, and then use cement as the bond between the two."

"In this way, it will not only reduce the excessive consumption of cement, but also better mobilize manpower, allowing most people to participate in the construction at the same time."

……

Smiling, he gave instructions to Wei Xian at the side, but Zhang Yan didn't think much about it, he just said what he thought of.

As for Wei Xian, he was taken aback for a moment, then shook his head with a smile, nodded again, and agreed.

"Well, don't worry, my lord, if you have this kind of help, the most heavy part of the construction of the entire Lujiang water conservancy system is equivalent to being solved, and the rest...just leave it to me."

"I dare not say it will be completed within three months, but if it's just digging and laying bricks... Hehe, before the rainy season this year, I will definitely solve all the water conservancy problems in Lujiang River."

Looking at Zhang Yan beside him with burning eyes, Wei Xian said with extraordinary confidence.

……

In this way, the busy time always passes quickly.

When everyone gathered together again, it was already fifteen days later.

This time, the place where everyone gathered was no longer the Science and Technology Department of Lujiang, but directly changed to the school grounds of the Lujiang Army and Horse Division.

This first and strongest army in Lujiang is currently undergoing repairs inside Wancheng, and will go to the Huainan area in the north of Lujiang to guard the border in the near future.

Taking advantage of the fact that these people hadn't left yet, Zhang Yan took Ma Jun and Wei Xian to borrow the school field where they practiced on weekdays.

Behind them is a brand new face.It is none other than Zhang Yan's current only cabinet minister, Lu Su Lu Zijing, the military adviser who is mainly responsible for all military operations and planning in Lujiang.

Now it has been fifteen days since the last experiment. In addition to the mass production of cement normally used for construction, this time, a new round of cement samples has also been produced by many researchers from the Science and Technology Department.

Since we are not rushing to build the spectacle as before, the second round of cement samples, all watered and solidified by the Science and Technology Department for half a month, waited until the strength of the cement was fully confirmed before Zhang Yan and others Call to see the finished version of the cement strength test.

Needless to say, some simple strength or anti-stress training, this is something that has been tested before.

It was another very interesting test that allowed Zhang Yan and others to appear on the school grounds together today, and even allowed Lu Su, who was already busy and kept his feet on the ground, to take time out of his busy schedule.

That is... a test for the existing cement building materials under "extreme conditions".

As for what this limit situation refers to...

Slightly glanced sideways at the whole row of things covered with red cloth in the last row of the school field, Zhang Yan hooked the corners of his mouth, and couldn't help but admire the brains and actions of the people in the Science and Technology Department.

In the entire Lujiang River, or in other words, the entire Eastern Han Dynasty, there may not be a more extreme situation than this kind of test.

Chapter 47 Precautions

The cause of the matter is actually this.

After learning that the performance of the cement was good, and that the test that day was only about [-]% of its true strength, the group of lunatic researchers from the Lujiang Science and Technology Department began to wonder where the limit of this material was.

And besides simple sewers, can these cements be used for other interesting things.

Perhaps it was because the last work of the Science and Technology Department was the [-]-type artillery belonging to the Weapons Research Institute, so this time, everyone thought of weapons, armor and other military-related things at the first time.

This cement... If it is used as a weapon, it will definitely not work.