The more new things you try, the more money you spend in this valley.

Not to mention anything else, just a sewer system and a cement road system are at least thousands of investments - a thousand in the thirteenth year of Zhenguan is enough to buy two houses in Chang'an City.

Anyway, in the eyes of Han Shan and others, these are all money that can be saved.

However, at Li Yuanjia's insistence, Zhang Wan still began to transform according to the requirements. After the construction of Luzhou City and Han Wangfu, he also experimented with the "industrial zone" on the Zhuangzi side, so he has a lot of experience in building sewer systems, and even if it takes time to transform the entire valley.

Don't rush, you can take your time.

The key is that if it is rolled out at one time, it will require a large number of manpower, and the materials such as masonry and stone used will be much more expensive, so Li Yuanjia's request to him is only to complete it in the next five years. In this way, there is no need for additional manpower, and the materials can be purchased slowly or simply made by yourself, and the cost can be reduced by at least half.

As for the cement road......

This is not a question of whether Li Yuanjia is in a hurry or not, but a question of the materials not being up to par.

The concrete road he asked people to build in his palace had already been smashed now, because it took only a little more than a month for more than a dozen cracks to appear, and the durability was obviously not up to par.

So when inspecting the first cement road completed in the valley, Li Yuanjia said to Zhang Wan, who was a little nervous, very calmly: "Don't worry, take your time, we have time." ”

"Yes, my lord."

Taking a deep breath, Zhang Wan said seriously: "We can now try out several new formulas every month, and then we will pave about a foot of pavement in the yard...... Only the one that performs the best will build a real road in the valley and will surely find out the best recipe in the future. ”

When he said this, Zhang Wan was also full of confidence.

Because after so much time has passed, the quality of the cement they make is getting better and better, and the road surface has been sticking for longer and longer. Although they had no chance after the cement road in the palace cracked, the king's attention to them never disappeared, and he would specially call Zhang Wan over to ask once a month.

Whether it is people or money, there is never a shortage.

Therefore, when the quality of the cement made by himself is getting better and better, Zhang Wan's confidence will naturally become more and more sufficient.

But at this time, Han Shan next to him suddenly interjected: "King, the old slave dares to ask, in fact, the money you spent on this cement may be enough to pave the stone road in the valley, why do you want Zhang Wan to continue to do it?" ”

Frowning, Han Shan looked puzzled.

After listening to his father's words, Han Lucheng, who had been standing respectfully next to him, jumped a few times in his eyelids and smiled bitterly.

This old man, is it time to let himself go now?

At the beginning, because he was always talkative, he was "allocated" by the king to Zhuangzi outside the city, but now he has become more talkative? It's also a shame that the king is not the kind of person who can't listen to what others say, and he won't be angry because of a few words, otherwise......

Sure enough, under Han Lucheng's anxious gaze, Li Yuanjia didn't get angry, but said a little impatiently: "It's very simple, I asked them to make cement, never for those roads in this valley, but for other more important uses...... Alas! ”

In the end, this sudden sigh made Han Lucheng's heart skip a beat!

Of course he didn't know that Li Yuanjia was having a headache because of the cement at this time. Now that this thing has been made, like white paper and glass, the next step is to improve the process and reduce costs, which is long but full of hope.

But for the use of cement, Li Yuanjia has a headache.

The cost of building roads is obviously too high, and I am afraid it can only be used in big cities like Chang'an and Luoyang. The only thing to be thankful for is that there are no heavy trucks and no overloading in these years, so once the cement quality is passed, the cement road should be used for a long, long time.

But what Li Yuanjia wants to see most is to build a house with cement.

How sturdy!

It's a pity that no matter how idiot he is in construction, Li Yuanjia also knows that building a house with cement is to use steel bars as a skeleton, and these days, not to mention steel bars, which are very powerful things when you hear them, even pig iron is expensive, who is willing to use it to build a house? And Li Yuanjia has heard that the steel bars used to build houses must also be treated specially, otherwise they will be very brittle......

Just when Li Yuanjia had a headache, Han Shan next to him also frowned.

The old man suddenly began to think, which made Han Lucheng, who was a son, suddenly nervous, and quietly walked over and tugged on his father's sleeve, and said in a low voice: "Father, don't ...... you"

"Huh? That's right! ”

Without waiting for his son to finish speaking, Han Shan's eyes suddenly widened, and he said in surprise: "The king is wise!" I almost forgot that this cement can be used to build a house! ”

"Uh......"

Glancing at Han Shan, Li Yuanjia suddenly couldn't laugh or cry.

Yes, cement can be used to build houses, but not in the way of reinforced concrete in the future, but as a binder for masonry. In these days, most houses were still wooden structures, and the mortise and tenon structure invented by our ancestors could make a strong and durable wooden house without a single nail.

But on the other hand, green bricks have also appeared, and together with stone, they have become one of the building materials.

It's just that green bricks need to use adhesives to glue them together, so most of the time they use mud and the like, and some high-end ones use glutinous rice slurry, which has high strength and of course high cost.

Cement is a perfect adhesive for masonry.

For example, the sewer system that Zhang Wan and his team are building now, the main road is made of bricks and stones, and the adhesive used is cement......

So looking at the king's contemptuous eyes, Han Shan immediately thought of this, and his old face suddenly turned red.

However, Li Yuanjia didn't laugh at his old housekeeper's thoughts, he just thought about it for a while, nodded and smiled: "Okay, you don't have to worry about the cement matter, I will be useful in the future...... Well, now that the glass workshop has moved to this valley, you can help the king watch it well! Remember, unless the king is in person, even if anyone comes with my warrant, they will never be allowed in, understand? ”

"Yes, King!"

With a pang in his heart, Han Shan immediately bowed down.

This is not the first time that the king has emphasized this matter, so he once again realized the importance and caution of the king in this glass workshop.

You know, whether it's a paper workshop or something else, the king has never said anything like that.

And when he looked down and couldn't see, Li Yuanjia also glanced at the entire valley, and a touch of ambition flashed in his eyes: "This place, in the future, will definitely let people know what is called productivity, and what is called knowledge is wealth......