I! Pretending to Be Reborn, Director of Doomsday Hoax

Campbell frowned.

In real life, very little concrete is fractured, and the pressure required to crush concrete, even for a small specimen, is very high.

Even for an undergraduate student in materials science, the ASTM standard test piece made at random, converted into a standard square column with a cross-section of [-] meter by [-] meter, has a bearing capacity of [-] tons or more.What is this concept?

A tank weighs only 54 tons, and the modified M1A2 weighs only 62 tons.

In other words, one meter square of concrete can carry fifty tanks!

To know,

This is just an undergraduate material science student who knows nothing and has never even been to a construction site. He casually created it based on dead knowledge in books...

Switching to professionals, coupled with special design, or special elements such as aluminum, can also double the bearing capacity of concrete.

In fact,

Calculated according to residential buildings, the anatomical building of ordinary concrete is about [-] to [-] tons per square meter.

The distance between load-bearing columns is generally about eight meters, that is to say, the load-bearing area of ​​each column is 64 square meters.

Calculated on the basis of [-] tons,

The weight of each layer accumulated on this pillar is about one hundred tons.

In other words, the weight of the bottom of a 25-story house is exactly [-] tons!

Therefore, there is no need to worry about concrete fracturing when building houses for residents.

Even if it is a tall building, it is nothing more than a thickened load-bearing column

The three treasures of structural design are "fat beams, fat columns and deep foundations". A load-bearing column of one meter by one meter can be built for 25 floors. If it is expanded to two meters, a hundred floors will not be a problem.

However.…

When this problem was placed on the giant wall of wind and snow, it immediately became serious.

To know,

In addition to bearing the strength of the huge wall above, the foundation under the huge wall of wind and snow must also be pulled and hit by secondary doomsday facilities such as Berry Country Kites!

In addition, underground, the nuclear power battery train of Berry Country is also running.

The soundness of the foundation is an issue,

It is also a difficult problem to use 30 meters thick concrete to support the weight of the entire wind and snow giant wall!

At present, the more commonly used concrete is C60 strength, which is 27.5Mpa, that is, it can weigh [-] kg per square millimeter.

That is, a load-bearing column of one meter square is 750 tons.

The highest strength commonly used in engineering is C80, and the compressive strength has reached 35.9Mpao

However, if C80 concrete is used, it can theoretically withstand the self-weight of the wind and snow giant wall.

It only needs to be strengthened a little bit, and these concretes can fully carry down the giant wall of wind and snow, as well as the accumulated ice and snow! However, Ain is so dignified...

Campbell looked up at Ain,

From the latter's gaze, he saw a hint of meaningful meaning.

Berry Country... is planning something.

The giant wall of wind and snow is really being built,

However, it is definitely not as simple as the giant wall of wind and snow!

On this giant wall of wind and snow, there may be extremely heavy devices, devices, or other things.

Otherwise, it is impossible for Ain to attach so much importance to this issue!

Ain laughed, everyone is smart, he doesn't need to mention too much, the so-called "Father of the Wind and Snow Wall", all he has to do is to make the Wind and Snow Wall, according to the director of the Secret Service, Ask, build.

He said: "Professor Campbell, tell me how to ensure that the giant wall of wind and snow will not collapse and the concrete at the bottom will not crack under the extremely heavy ballast!"

Campbell looked thoughtful.

Extremely heavy weight ballast?

It's almost explicit!

Of course, he has been in the top power center of Berry Country for many years, and he knows too much about the truth that the faster he dies.

Campbell didn't want to know what was going to be loaded on the giant wall of wind and snow, so he said quickly:

"Looking at it this way, there are indeed several ways to increase the load capacity.

"The most important thing is to change the strength of concrete! Theoretically, the perfect compressive strength of concrete can reach 124 psi, or even [-] psi...that is [-]Mpa!

"Of course, this is only the theoretical compressive strength of the laboratory, but we can also control the water-cement ratio as much as possible, choose special low-calorie cement or add fly ash, etc., infinitely close to the perfect compressive strength.

"If that's not enough, there's only one last resort...  

"Concrete Steel Tube!"

Ain showed a puzzled look.

Without waiting for him to question, Campbell explained: "Imagine, a pile of gravel, that is, a plate of loose sand, is almost impossible to bear any weight, and it will collapse if a person stands on it!

"However, if you put this pile of stones and sand in a very strong iron bucket...

"When an iron bucket is filled with gravel, it becomes a solid iron pillar.

"The existence of the iron bucket increases the effect of the hoop, thereby limiting the lateral deformation of the sand and gravel, which prevents the sand and gravel from collapsing to both sides. In this case, the vertical load-bearing capacity is greatly improved!" That's the principle.

The concrete that was originally scattered all over the foundation was poured into the steel pipes one by one, and the gaps between the steel pipes were also filled with concrete.

In this case, the steel pipe hoops the concrete, which greatly improves the compressive capacity of the concrete.

The concrete supports the steel pipe from the inside and prevents the buckling of the steel pipe.

In addition, the huge concrete volume inside can improve the thermal insulation performance of the steel pipes outside to a certain extent, and can achieve a better temperature insulation effect.

Hearing this, Ain finally nodded.

Campbell went on to say: "As for the fourth question, how to pour concrete on the upper floors of the giant wall of wind and snow, and how to design and pour the top of the giant wall of wind and snow..." Here, the main difficulty is actually very clear.

050 First, if the concrete strength grade is high, the trial mix is ​​very heavy.

Second, the concrete transportation distance is too high, and it is necessary to solve the problem of not causing quality deviation due to concrete transportation.

In addition, the wind and snow giant wall can be regarded as a super high-rise building structure. The type of this building is generally different from the reinforced concrete structure of ordinary high-rise buildings.

Moreover, our wind and snow giant wall is indeed built with a variety of concrete and combined with various materials.

Therefore, the vibration quality assurance of concrete is a difficult point.

The last point is that since high-rise pouring is desired, the tower crane device must be indispensable. This point is easy to solve, and it is enough to ensure the efficiency of the tower crane machinery coordinated construction. ’ thought Campbell.

Since it is a super high-rise, from the structural design calculation point of view, the design strength level of concrete is very high, even breaking through C80, reaching CIOOs C120o

High strength means low fluidity, and the initial setting and final setting time will be advanced accordingly.

Therefore,

The first point is to solve the trial mix of high-strength concrete in the laboratory,

The concrete mix ratio with high strength, moderate fluidity, good workability and long initial setting and final setting time was tested.

Strictly control the ratio of each component, material quality, gradation, tank exit temperature and mold entry temperature, etc.,

the most important,

It is to ensure that the flow in the pump pipe is smooth and the slump meets the design requirements!

Moreover, due to the super high-rise, the structural types of the wind and snow giant wall include a variety of rigid steel-concrete hybrid structures and steel pipe concrete structures.

There are even different types of new concrete combinations.

In addition to its own huge weight, and the unknown heavy things that may be installed outside the giant wall of wind and snow,

Outside, there are also tests such as continuous winds and thick ice and snow.

Therefore, the construction of the wind and snow giant wall must meet the requirements of concrete corrosion resistance, sulfate resistance, chloride ion resistance, and alkali content.

For this reason, the Berry Country Engineering Department also needs to do more work on trial matching, which is the key to testing the supply capacity of the concrete mixing plant.

The second problem, the transportation distance is easy to solve.

The highest point of the wind and snow giant wall exceeds 50 meters,

What it uses is actually not a cube, but a structure similar to a hemisphere.

Therefore, the height in some places is even close to 80 meters!

In this case, the transportation distance of the wind and snow giant wall increases, and the pumping efficiency is easily attenuated in the height direction.

Campbell looked very relaxed, and said: "Currently, some manufacturers in Berry Country have been able to provide concrete pumps that pump to floors above 400 meters!

"For example, the MCT9320.772RS pump machine produced by Berry and the MCT9OCH-6135D pump machine produced by Wilton Industrial have many construction examples of super high-rise buildings with stable performance.

"The giant wall of wind and snow is only more than 80 meters.

"Big deal, set up a transfer and delivery platform in the sky, and pump the concrete from the platform to the top of the giant wall of wind and snow."

Ain clapped his hands, very satisfied.

"As expected of No. 1 in the world's concrete material science, the Berry Country's giant wall of wind and snow will come out soon!"

Yoder was also very excited, and said: "Professor Campbell, on the day the giant wall of wind and snow is built, you will receive the Commander Medal and become one of the people with the highest honor in Berry Country!"

Campbell modestly stroked his beard, smiled and said, "Professor Ain, Lord Commander, there is no need to worry, the quality of concrete has already been determined, and this material cannot be used at too low a temperature.

"Dragon Kingdom will also be affected by the Little Ice Age and winter cooling, so construction has to be suspended!"

Joad was relieved.

However, at this moment, Yoder's communicator rang a few times.

This familiar voice...

Everyone's eyes moved over at the same time, staring at Joad.

"It's the Dragon Kingdom's Dangerous Information Bureau that has released another message!" Yoder naturally knew what the notification sound meant.

After a few seconds, Joad's face was ashen.

"What's going on, Lord Commander?" Ain and the others were curious about what happened.