Lunch is followed by a short break.

Although the season has entered spring, the temperature in early spring is still not high.

Cao Tou took two young people from his own team to the post in the residential area of the construction site.

Familiar with the number plate of his team, the staff in the post passed the three of them to a disposal shelf.

"It's all here, there's a cart next to it, remember to come back when you're done with it."

The staff of the post post spoke briefly, and then greeted the newcomers.

After running with the construction site for such a long time, he also knew that the middle of every month was the busiest time for their construction site.

During this time, the volume of letters exchanged was several times higher than usual.

The letters they sent on the construction site were no larger than in other places, and most of them were clothes, bedding and other things.

Most of the workers' annual wages are sent back to their families, and together with the grain and cloth used to pay for the wages, the family's life is fully guaranteed.

Once the cloth was available, the ladies of the family would cut the cloth to make clothes and bedding, which would then be sent back to the construction site through the local post.

These things are important, but they are not worth mentioning for many people in high positions.

But for those who spend three-quarters of the year out shoeing, it's enough motivation to continue to support their efforts.

Therefore, to a certain extent, the importance of the sending of the family members on the construction site is second only to the degree of military materials in the post transmission system.

The three Cao Tou moved all the things sent by their team outside and loaded them onto the wheelbarrow.

Outside the door, Cao Tou told the two of them a few words, then turned around and returned to the post bureau, filling in the information one by one with the things that the workers wanted to send back.

The supervisors of Liaodi are not like the supervisors of previous dynasties, in addition to supervising the work of the workers, they are actually more of a safety officer.

They have been trained for a long time, and although their education level is not as good as that of students who have actually graduated from universities, they have no problem reading and writing one or two hundred commonly used words.

Many of the letters received by the workers on the construction site were read and written by them, and the workers were in need, and they provided the needs, and over time, the bond between them was very strong.

The afternoon construction site was filled with joyful laughter.

In this letter, we learned that someone had added an heir to the family, and that there was the joy of the marriage of a son in the family.

In the past, people had to organize people to start work an hour after lunch.

But in the middle of each month, the start of work is delayed by an hour as usual.

Two o'clock in the afternoon.

At the site at the very end of the road, workers leveled the land again and laid two wooden tracks on one side of the road.

They didn't know what the wooden rail was used for, and for almost a year, the wooden rail had been laid all the way from the starting point of their departure to here.

But by four o'clock in the afternoon, they knew what the rails were really for.

I saw a huge behemoth emitting white smoke making a roaring sound, slowly driving from the direction of Taiyuan City.

Something that had never been seen before made the workers tremble.

But fortunately, their foremen were there, and the scene was calmed down in a few words.

Naturally, the white smoke coming from it was a steam train.

However, compared to the train used on rails, the train running on wooden rails is one size smaller than the train.

The train did not go to the end of the tracks, but stopped a hundred meters from the end of the tracks.

Then, the cars behind the front of the car were pulled apart in unison.

Three or four hundred staff members in uniform jumped off the train in a formation.

The director of the road project team had been waiting for a long time, and when he saw someone coming down, he greeted him with a smile and hard work.

"Hahaha, hard work, you have arrived, and I know that the last step of this road is about to begin."

"Let's not talk about it if there are more, start work, start work!"

The person headed by the newly arrived hundreds of people also had the same smiling face as the road team supervisor, and after a few words of greeting, he began to arrange manpower to prepare for work.

These are the latest batch of skilled workers to be trained, and their main purpose is to complete the last step of the road.

Laying asphalt mixture.

Yes.

It's been almost ten years, and after taking Shanxi, Zhang Qi got out the asphalt mixture in the road project.

In fact, asphalt mixture has been available for a long time, but the previous focus was on conquering territory, and there was no suitable time for real road construction.

And now, the time has finally come.

The straight road from Taiyuan to Yanmen will also be the first real high-speed road in this era.

The reason why the first asphalt road was laid on this side of Taiyuan.

It is precisely because of the abundant coal resources here.

Asphalt can be roughly divided into three types, one is natural asphalt that naturally exists underground or in the open air, and the other is the by-product of gasoline and diesel asphalt obtained through the process of distilling petroleum, also known as petroleum asphalt.

The third is a by-product of the production of coking coal by distilling coal and wood, also known as coking coal pitch.

The development of oil began early in Liaodi, but the production is not large at present, and the oil deposits in the Far East are now only a few open-pit deposits.

But in Taiyuan.

Because a large amount of steel was needed, a large number of coking coal plants were also built early.

And the tar to asphalt obtained is too much to put down.

Therefore, for the future petroleum industry, Zhang Qi established a new technology of tar distillation.

In principle, some of the things that oil can do, tar can do as well.

It can also be used to produce gasoline and diesel, but the process is more complicated than petroleum refining.

But the essence is the same, and that is distillation.

The disadvantage of coking coal asphalt is that coal coking asphalt mainly contains harmful substances such as anthracene, phenanthrene, and pyrene, which are difficult to volatile.

Although these harmful substances can be completely volatilized after heating at a high temperature of 260 degrees Celsius for five hours, the time required to obtain coking coal asphalt is far from enough, although the temperature is far more than 260 degrees.

Therefore, after the crude coking coal asphalt product comes out, additional processing is required, and the protection level of the workers in the coking coal asphalt production plant is also the highest level in the entire Liaodi Zhengquan.

With asphalt, Taiyuan has also completed the asphalt mixture technology of mixing asphalt with sand and gravel under the guidance of the Liaodi Guidance Group.

I don't dare to say how good other technologies in Liaodi are, but in terms of fire refining technology, it can be said that it has exceeded this era for thousands of years.

The mixing furnace was removed from the train by workers.

The roller drums of the rollers are also connected in front of the reserved space of the steam train in the concerted efforts of hundreds of people.

Why lay wooden tracks?

In order to be the power source of the compaction.

Steam train roller!

(End of chapter)