After listening to Han Lucheng's words, Li Yuanjia didn't care very much, but just said that he would go back tomorrow to have a look, and then sent his housekeeper away.

After a long time, in fact, Li Yuanjia's enthusiasm for cement is decreasing day by day.

There are two reasons for this, one is of course because the quality of the cement is always unsatisfactory, whether it is the paved road, the cement wall that is built, or even the more "thick" cement platform, it is difficult to stand the time...... The main reason is that it cannot withstand the test of various external forces.

The cement road that Li Yuanjia asked Li Yuanjia to build in the palace earlier finally shattered into pieces in Fang Fengzhu's disgusted eyes.

If you do the math, it really didn't last long.

It's frustrating, but that's the reality.

As a pure layman, it is not easy for Li Yuanjia to remember the "practice" of cement, as for the specific process and the ratio of various materials, he really doesn't understand. So the only way is to give the method to Zhang Wan and them, and then experiment and try little by little.

So later, when the cement workshop outside the city was completed, and the glass workshop was also started in the valley, Li Yuanjia asked Han Shan and them to arrange the "test field" here.

The place is big, people are siblings, and they can be tossed casually.

But if you are serious, this is not the main reason, because the method is definitely right anyway, and the rest is to try again and again to finally find the most suitable formula at the moment. In other words, as long as you persevere, you will be able to succeed sooner or later.

What really disappointed Li Yuanjia was the production cost of cement.

It's too high.

In the simplest terms, cement needs to be burned out with fire.

It takes a lot of temperature to burn cement, and now it's barely possible to burn it because of the coke, but the need for fuel to burn enough cement is too huge!

So even if Zhang Wan and they slowly made cement with good quality? After calculating the cost of fuel, the cost of manpower, and the cost of building these manufacturing plants, Li Yuanjia understood one thing - wanting to promote such a thing as cement in ancient times is simply a dream!

Here's an example...... Li Yuanjia didn't dare to cite examples such as building houses and building city walls, because even if there was qualified cement, there would be no sufficient amount of steel bars to dare to do it?

And if it's used to pave roads, or build some hard cement platforms or something......

The cost is at least dozens or even hundreds of times higher than that of soil!

What is the significance of Gao Cheng like this?

No way, Xi'an is not like Rome, there is a large volcanic group not far away, which is where the god of fire lives in Roman mythology. It was a real pie-in-the-sky, and there was a lot of volcanic ash nearby, and the Romans only needed quicklime and volcanic ash to replace the modern cement......

Li Yuanjia must still keep it in the cement workshop, and most of the coke made every month is given to them. But for the large-scale use of cement during the Zhenguan period of the Tang Dynasty, Li Yuanjia has slowly lost that mind.

It's okay to transcend the times, but it's too much nonsense to transcend too much.

Even if the progress of the process is great, the cost of coke production cannot be reduced, and the cement made may be able to allow Li Yuanjia to build a few short cement roads by himself. The reason why I am reluctant to give up is just to accumulate more data, and then record it and leave a little valuable information for future generations!

At least for now, Li Yuanjia really thinks so.

Merely......

Early the next morning, when he took Han Lucheng to the valley where the glass workshop was located, and saw a cement road inside, Li Yuanjia's expression was stunned, and even Han Shan, the old housekeeper who came forward to salute him, forgot to pay attention!

The cement road is not long, at most it is more than ten meters, about one meter wide? It's like ...... to still be in this valley Well, it's not very nice to describe, it's just an inconspicuous appearance anyway.

But after seeing this road, Li Yuanjia was really a little surprised.

It's flat!

If you just look at it from the first feeling, Li Yuanjia feels that this road is very smooth.

"Well, you guys wait a minute!"

Waving his hand at Han Shan and the people he was carrying, Li Yuanjia walked directly to that road, and then walked and walked on it, stepping on it and stepping on it, and the expression on his face gradually became strange.

And seeing all this, the group of people next to him had different expressions.

Han Lucheng was expressionless, just stood there with his hands down, quietly waiting for Li Yuanjia to speak. He knew well the king's temper, and knew that although his attention to this thing was decreasing, he never said anything about giving up, and even ordered them several times not to shorten their needs. Therefore, seeing that the king seemed to be in a good mood, Han Lucheng knew that Zhang Wan's kid had finally become a good kid this time.

And his son Han Shan, after the corners of his eyes twitched several times, his eyes couldn't help but show helplessness. He really couldn't understand that this concrete road was indeed good, but it cost much more to build a road than to pave it with stones, so what was the use?

Only Zhang Wan, who was in charge of building this cement road, was full of joy in his eyes, and the curvature of the corners of his mouth could not be concealed.

Without a doubt, this is the one concrete road he is most satisfied with.

On average, they can try out a variety of new formulas every month, and then select a few cement roads that perform well, and have accumulated a lot of experience and data. But no matter which way you look at it, the cement road under the feet of the king is now the best!

So seeing that the king noticed this road for the first time, Zhang Wan was naturally very happy.

Sure enough, after a while, Li Yuanjia looked at him and said loudly: "Zhang Wan, how long has this road been built?" After it was built, you didn't keep looking at it, did you? ”

"Back to the king, it's been built for a month and a half!"

After taking a deep breath, Zhang Wangong said: "And since the road has dried up, many heavy objects have been transported on it every day, and there has not been a crack until now!" ”

The voice was not loud, but anyone could hear the pride in Zhang Wan's tone.

"Hmm."

After his eyes flashed, Li Yuanjia nodded with satisfaction.

Transporting heavy loads?

With that little cart or something, even if it is "overloaded" to the extreme, how much can it be? In Li Yuanjia's opinion, it is not worth mentioning at all. What makes him satisfied is that it has been built for more than a month, and there is not even a small seam, and now it still looks so smooth and smooth, which can't help but give people a thumbs up!

So after stepping on a few more feet, Li Yuanjia nodded and smiled: "Hehe, not bad...... Zhang Wan, after going back today, I will hand over the specific data of this formula to Han Lucheng. ”

"Yes, my lord."

After a smile appeared on his face, Zhang Wan hurriedly nodded yes.

It's just that he waited for a while, but he didn't wait for the king to continue, but heard him say to the old butler: "Han Shan, take me to see the new craftsmen you have taught, and also see the glass ...... they made."