MTL - Release that Witch-Chapter 12 Firing

Roland stood in the backyard of the firing room waiting for the first batch of cement to come out.

This brick house was designed for cement production and is about 15 meters long and four meters wide. There is a door in front and rear, the difference is that the front door is as spacious as possible for people to carry materials. The back door is only one person wide, allowing Anna to sneak into the firing room.

To this end, he also built a circle around the half-waist of the house, surrounded by the second half of the firing room, and the entrance and exit were arranged by the Cavaliers - they are all under Carter's subordinates, and loyalty is beyond doubt.

The production process of cement is very simple. The limestone is crushed into powder and mixed with clay and iron powder. The mature material is calcined by dry or wet method, and then ground with gypsum. The raw materials are very common, and the iron powder is difficult to produce in large quantities. The key is the calcination temperature of the clinker.

Roland does not remember the specific temperature required to burn cement. Even if he remembers, he can't measure and control temperature. Both infrared thermometers and thermocouples are many times more complicated than cement. He only knows that this temperature is almost similar to the melting point of iron, and the calcination process is also a difficult problem in the production of cement.

In the era of underdeveloped smelting technology, maintaining the blast furnace temperature has always been a problem that plagues everyone. The heat loss of the ordinary open furnace is extremely large, and it is difficult to keep the furnace temperature above 1200 degrees. The reverberatory furnace needs a high temperature resistant liner, and he will not think about how to make refractory bricks for a while. The traditional iron-making blast furnace is even worse. The temperature may reach the standard, but the narrow furnace cavity is used to calcine the cement. I am afraid that even if the demon moon has passed, it will not burn enough.

Therefore, Roland designed the firing room without any heating measures. He relied on Anna.

The small-grained limestone, which has been manually broken, is mixed with clay and mixed with water to form a slurry, which is evenly spread in the firing chamber. Then the Cavaliers locked the door and cleared the handyman. Anna enters from the back door and lets the flame bake the slurry on the ground until the iron rods that are placed together in the room melt.

Roland is somewhat restless, this is the first step in his stay in Bianbu Town. If you can't make cement, the plan to build a wall in three months is just empty talk. There is no wall blocking, I am afraid that no one is willing to stay in this ghost place. Whether it is real history or fictional literature, if you want to farm well, a stable base is essential.

"His Highness, can you really stick the stones together?" asked Carter Lannis, who was next to the Four Princes. Although the prince told him that this is the latest research results of the Grey Fortress Alchemy Workshop, he still believes. After all, the gang did not make any really reliable alchemy products.

"Who knows? Anyway, they said this," Roland said.

This world alchemy, together with astrology, is known as the Sage, and is very popular in mainland countries. The royal family will generally train their alchemists and astrologers for the refining of secret medicines and the prediction of fate. For ordinary people, these studies are too high, so that the mentality of blind faith has arisen. With this in mind, Roland naturally brought the source of the cement formula to the alchemy workshop. As for the chief knight, believe it or not, it doesn't matter.

The flame that came out of the window gradually went out, and it looked like it was burnt.

Roland screamed and stood up, driving Carter out of the yard and waiting alone in front of the back door of the brick house.

The iron door slammed open and Anna rushed out. Roland put her robes on her for the first time, and gave her a glass of water. "How?"

The witch's face is gray and the wet process of the cement is low, but the hot air will still bring dust when it is calcined. For her who can't wear a mask, staying inside for dozens of minutes is obviously not too comfortable. She coughed twice and nodded. "The mud has turned into gray powder."

Roland couldn't wait for the temperature in the firing room to drop low enough. He wrapped the wet towel around his head and grabbed the shovel into the back door.

The hot air instantly surrounded him. He felt a little difficult to breathe at one time, and the skin on his hands was painfully roasted. Fortunately, it takes too much time to shovel a ash, otherwise it will be a few minutes in this environment to cause high temperature shock.

"This is what you want?" Anna put the witch suit in her face and asked.

“It looks a lot like it,” Roland flattened the powder and felt the rest of his temperature with his fingers. “You don’t have to try it until you know what to do.”

"what's it for?"

"To build a house, build a bridge, or build a road, there are too many places to use. If it succeeds, the people's residence will not be afraid of the cold, and heavy rain and heavy snow will not be destroyed." He patted the small hand with his other hand. The girl’s head, "It’s the one you made."

Anna bowed her head. I don't know if it is an illusion. He thinks that the girl's breathing is getting faster.

Theoretically, the cooked clinker is ground with gypsum to adjust its hardening time. But at this time, there is no need to consider so much. Roland took a break and then shoveled two. Then he called Carter, who stood outside the hospital, and asked him to prepare cement mortar according to the ratio of three portions of lime powder mixed with river sand.

The chief knight also did not mind doing some rough work. For him, doing this kind of thing is much better than fighting for his high school in the Grey Fortress or hooking up the aristocratic lady.

Since no iron powder is added to the raw material, the color of the cement slurry is pale and white. Roland poured them all on one stone brick and buckled the other one. The solidification time of the cement is about four hours. Considering the instability of the prototype, he intends to wait until tomorrow to see the results.

Early the next morning, Roland hurriedly took Carter and Anna to the backyard of the firing room. Pushing the door open, he noticed that the cement's appearance was solidified and tightly joined to the two stone bricks. The consolidated surface looks rugged and hoarfrost appears in some locations.

Roland squatted down, scraped off the hoarfrost produced by the alkalization reaction, and pressed the hardened cement with his fingers. The touch made him feel happy - the cement surface was strong and the hand was completely different from the touch after the soil was compacted, that is, the use of nails There is no way to leave a mark on it.

After Carter got the four princes, he first tried to lift the stone bricks, but he failed. He kicked a few feet from the side until the joint between the cement and the ground was broken, and the two stone bricks remained firmly bonded together. Finally, he waved his hilt and hit them hard, and he could only knock a small corner.

“Is this the effect of “cement”?” Carter immediately realized its role. “It’s incredible. Yesterday it could flow like a melting candle, and it was as rocky after only one night. With this kind of thing, how fast the city wall wants to build can build. As long as there are enough stones, we can even build a wall around the border in five years! ”

"What's the use?" Roland didn't take it for granted. "The tall walls can't stop the enemies from inside. I would rather turn the dilapidated wooden houses in Bianbu Town into solid concrete houses, so that my people no longer need to Worried about falling into a homeless situation after a natural disaster."

"..." The chief knight stunned, and he did not expect that the four princes who gathered all kinds of nobles would say such things.

"You will see it later," Roland once again affirmed the way he wants to go - for many passers-by, technology is the primary productive force. Here, the witch is the first productive force.