Jingwen asked Ma Zhou to take charge of the zuò chariot, and Jingwen was idle again. Recently, he was mainly responsible for the management of the firearms troops, that is, taking everyone around to open mountains and quarry stones, so that those soldiers could get used to gunpowder. And the deputy commander of the firearms battalion, that is, the original Xiaodao boy Yuan Hua, is also constantly researching gunpowder, striving to develop more gunpowder formulas. As a result, in just a few days, this Yuan Hua researched several gunpowders with different powers. Although these gunpowders do not have a great use at present, they may have a lot of use for the civilian gunpowder market in the future. Although it was impossible for the real people to use gunpowder, Jingwen planned to build a state-owned construction team with Emperor Yì in the future, so that he could go around to open mountains and quarry, and change the environment of those roads. Blowing up the earthworks on those hills can save a lot of the cost of building roads and detours. At present, gunpowder still cannot be put in people's homes, otherwise there will be a risk of leakage, so only the state-owned construction team can be responsible.

"Marshal, the overseer asked me to tell you, we don't need to quarry first, there is a problem with our lime kiln." A staff officer from the Civil Engineering Barracks Section of the Logistics Department came over and said to Jingwen.

Jingwen couldn't help but shake his head a little when he heard that there was a problem with the lime kiln, because it was Yan Lide who was now presiding over the construction of the city, so the lime kiln was also managed by him. Now that there is a problem with the lime kiln, it is natural that the quarrying work must be stopped. However, now the soldiers of the firearms battalion are no longer afraid of gunpowder, so they can also stop. Jingwen also entered the county seat of Pingyu, preparing to meet Yan Lide to see how his city construction work was progressing.

Jingwen arrived in Pingyu County and found that the city construction work here was also very smooth, and many houses had already been built. And watching the houses being built one after another, Jingwen was also relieved, because this place would be his own fiefdom in the future, and of course he would have to worry a lot. And Jingwen soon came to the lime kiln where the lime was burned. As a result, it was found that Yan Lide was directing everyone to clean up the lime kiln. Jingwen walked in, and then took the initiative to greet Yan Lide.

"Yan Jianjun, what's going on?" Jingwen asked.

Yan Lide said indifferently: "There is no problem, there is an old problem." When we burn lime, sometimes we will burn some gray things, which we can't want. And we need to clean up the lime kiln to avoid firing this gray thing again. This is an old problem, not a big problem. ”

And Jingwen soon saw that the workers had cleaned up some gray powder from the lime kiln, Jingwen was curious for a while, and took the initiative to check the powdered thing. It seems familiar.

"Why do I seem to have seen this thing somewhere?" Jing Wen muttered in his heart.

"Really, as long as there is some clay in it, it will always burn out these gray things, and it will be wasted." One worker complained.

"Damn, it's this thing, this thing is cement!" Jingwen exclaimed.

When Jingwen heard what the worker said, he immediately remembered something, that is, cement. According to the memories of Jingwen's previous life. The firing process of cement and lime is very similar, except that some clay is added to the lime immediately to become cement. And now the statement of this lime worker immediately made Jingwen think of this problem, that is, this gray powder is cement. Isn't that a great thing? However, these workers did not know the goods, and even Yan Lide did not think that this was a good thing, and as a result, no one found such a thing as cement for so many years.

"Brother Yan. This is a good thing, a good thing! Jingwen said.

"What's this good thing about?" Yan Lide asked.

Jingwen immediately asked the workers to collect the cement, and then immediately pulled some sand. Then stir together. After that, pour in the water and stir vigorously. At present, Jingwen himself mixed it this time, and because he had no experience, he did not get much cement concrete. And this concrete is probably only the size of a small ping-pong ball, not a lot.

"Okay, let's wait for him to finish, so we can take care of it." Jingwen said.

After a while, the cement the size of a ping-pong ball gradually dried up and finally became a round concrete ball. After that, Jingwen picked up the spherical concrete, and then handed it to Yan Lide to check.

"Brother Yan, look at this thing, it's hard enough! If it is used as a building material, it is much better than lime. As long as it is used to fill those masonry cracks, isn't it able to firmly build the house? Moreover, we can directly use this concrete as a construction material, so that we can make the house construction intact, and we can also use it as a very good building material! Moreover, the cost of this concrete is not lower, as long as the cement is fired, the concrete can be configured anytime and anywhere, such a house is durable and durable, much stronger than the original stone houses. The main thing is that he can mix it casually, and it is very difficult to make different shapes like stones. Jingwen said.

Yan Lide also took the initiative to study the concrete ball carefully, and then put it under his feet and stepped on it.

"Wow, that's hard! I'm afraid this thing is about as hard as stone, and artificial stone is not an exaggeration. Yan Lide said.

But Jingwen said: "No, this is definitely not as hard as a real stone." Because this one is only man-made, and only the most ordinary cement. In the future, I am afraid that there will be hard cement, and even many new cement varieties, which are the real cement that can be compared with stone. This kind of cement is just light cement, and it cannot be used as a real stone. However, for us, it is enough. We can use it to build the city walls, so we can save a lot of transportation costs. Moreover, a lot of costs can be saved, so that our Datang can build the city wall countless times faster. Later, when the enemy comes to attack, see how they play, and we can build quickly. In a few days we will be able to build a wall, and they will probably cry by then. ”

"Hahahaha, this is really the best treasure of our civil engineering family!" Yan Lide said.

In this way, the lime kiln was transformed into a place for firing cement, and cement was used for the construction of the castle in the future. (To be continued......)