The scale of Tiangongfang is far better than before, covering an area of ​​1,200 acres, and thirty-six steelmaking furnaces have been built. There are more than ten subdivided workshops such as Jiagongfang, Bingguofang, Agriculturalguofang, and Waterwarefang. There are hundreds of craftsmen in each workshop. With the explosion of production capacity, the return rate of income is comparable to that of gold mines.

Walking through dense workhouses and residential areas with superior conditions, we walked along the winding river to the shade behind the mountain. There was a very hidden canyon here. The entrance only accommodates three or five people, with iron fences, and arrow towers built on both sides. Every day, there were heavy troops guarding each other, and it was difficult to cross the birds.

After checking the command of the day, he also showed an incommendable bronze card. The rotating team leader saluted Xu You and Zu Yan and then put them in.

This is the secret R&D base of Tiangongfang. It is surrounded by mountains on three sides, with only the entrance of the canyon. It has no name to the outside world. The internal R&D personnel nicknamed it "Phoenix Valley". They take the meaning of Phoenix Nirvana, hoping that every experiment can make a living and find vitality.

The defense inside the valley is even stricter, with three steps and five steps, one whistle, and another seven or eight miles away. The front of you is suddenly open, with the surrounding walls thousands of feet high, and it is a green lake with irregular shape, formed by the flowing and impacting the dark river in the hillside. Around the lake, there are rows of houses, but what attracted Xu You was thinking about was the two-story cement brick house that had just been built. From the outside, it is closer to the collective dormitory in later factories. It is all practical, without any aesthetic considerations, and is completely different from those rows of houses.

Xu You said in surprise: "This...when did you get the cement and red bricks?"

The ancient blue bricks used in the East had poor efficiency, high cost and low output, which was in sharp contrast to the red bricks used in the West. The different branches of this technological development involved the differences in the two architectural thinking between the East and the West.

Oriental buildings are mostly made of wooden structures because wood is easier to create large building spaces, while masonry and stone are pressure materials. Due to the lack of understanding of stone mechanics, they can only be used to build foundation buildings such as tombs, pave pavements, and build heights into walls, and cannot become the main body of the building.

Therefore, limited demand has created a small brick kiln with fine work, and the process design that requires capping and watering has caused the cost of blue bricks to soar and the efficiency has dropped sharply.

The ancient Romans used the method of crossing the barrel voucher to solve the problem of this century, using three horizontal barrel vouchers and one vertical barrel voucher, a hall technology called "Basilica" to create large brick buildings. Therefore, the demand for bricks cannot be met by large brick kilns.

At that time, the large brick kiln dome was extremely expensive, so I could only settle for the second best. Opening the kiln roof, the result was sufficient oxygen combustion. The burned red bricks were durable, rich in color, large in output, and low in cost, and quickly occupied the market.

Xu Youzeng and Zu Yan discussed with him that red bricks can be made to reduce costs and increase output. Even if brick-and-stone buildings cannot be used instead of wooden structures, they can use military aspects first in the future and then slowly promote them.

But when it comes to military uses, the role of red bricks is not the most important, and cement is also invented!

Cement is in red bricks, and in this era when the fortress city needs to focus on defense, it seems too rough and shameless!

The cement manufacturing process is not difficult. In ancient times, there were already very mature lime firing processes and lime gel materials. The Great Wall of the Qin and Han Dynasties were mostly built with limestone fired with this technology. By the Southern and Northern Dynasties, three-soil glutinous rice mortars such as lime, glutinous rice plus sand and soil were already popular, but the same thing is still the case. The cost is too high and the time is too long. The technology that cannot be used on a large scale is equivalent to nothing.

Therefore, the invention of cement was put on the agenda of Tiangongfang.

Xu You knows the general method of cement manufacturing, grinding limestone and clay into surfaces, and then adding granulated blast furnace slag as active mixed material, and it can be successful in a certain proportion.

There is a lot of limestone, and there is no shortage of clay, and blast furnace slag is available. However, Xu You didn't know about this certain proportion. Zu Qiong needed to take people to conduct difficult experiments, find the best value, and then form a fixed method.

The one who finally solved the proportional problem was Hu Hongzi!

"About half a month ago... Come, come, walk here, compared to that black thing, cement and red brick are nothing..."

Zu Yan's excitement was completely different from Xu You. He pulled him directly to the innermost secret workshop and was the most closely guarded.

To put it bluntly, only things that transcend the times are developed here!

"General, this is the black thing you mentioned. It's really amazing. The moment it explodes, it can reach blue and white..."

Since the pre-Qin period, temperature measurements are classified according to the color of fire: in the form of cast gold, gold and tin, the black and turbid air is exhausted, followed by yellow and white; in the yellow and white air is exhausted, blue and white air is exhausted; in the blue and white air is exhausted, green and white air is subsequently followed by green air.

The green air is 1200 degrees, and the green white is about 1000 degrees. In other words, the instantaneous temperature of the black thing can be almost the same as the temperature difference that can only be achieved by burning day and night in the fire kiln.

Xu You was not as excited as Zu Yan imagined. As long as you know the ratio of this thing, you can make it with sulfur, saltpeter, and charcoal after intensive experiments.

In order to increase the success rate, he also specially invited the famous alchemy master Hu Hongzi to assist. Hu Hongzhi wrote "Fu Xuan Zhen Jin Jue", which is one of the few Niu Bi people in this era who can compare with the Danyang Ge, who is best at elixir in his personal name.

It is extremely difficult for others to ask him out, but it is easy for Xu You to write several chemical equations for junior high school, verify several typical chemical experiments, and explain the representative meaning of chemical symbols and the internal logical relationship of chemical reactions.

So Hu Hongzi rushed to Tiangongfang overnight, hoping to write letters to Xu You every day to ask for chemistry knowledge. Xu You was plagued by military affairs and had no time to teach him, so he threw him to Zu Yan and agreed to complete the task first, and give him fifty chemical equations on the day of completion.

Hu Hongzhi really tried his best, forgot to eat and sleep, and regarded the workshop as his home, played the spirit of ownership, and studied the black stuff, and also solved the cement ratio!

The result was perfect and shocked. No one expected that the black thing in Xu You's mouth would have such great power. But looking at Xu You's expression now, it seemed that he was still a little unsatisfied?

Hu Hongzhi was afraid that he would change his mind, so he opened his eyes wide and said angrily: "General, this is created according to your method. Whether you are satisfied or not, you must give me the agreed equation!"

Xu You smiled and said, "You can not only create black things in just one year, but also pelletize them. This is a credit beyond the agreement, so I decided to give you a hundred equations, how about it?"

Black things are naturally black fire (this word is prohibited). From powder to granularity, it can perfectly solve the shortcomings of transportation inconvenience, uneven combustion speed, and easy moisture, and can make the combustion speed more uniform and more efficient, while the power is nearly three times higher.

Which boss doesn’t like employees who can learn from others?

Hu Hongzhi jumped up excitedly and said, "A gentleman has no joke?"

"Get paper and pen!"

Through the defensive stack made of cement, red bricks and iron blocks, Zu Yan demonstrated the explosion of the black fire for Xu You, buried it in the brick pit with five kilograms of compression, ignited the leads, and exploded quickly.

The sound was like thunder, bricks and stones were splashing, and everyone behind the defense pile showed joy. Even though they had tried it many times before, they could not help but feel honored when they saw such things that were only created in myths by their own hands.

Xu You smashed the mouth and said, "It's okay...oh, the power is still a little worse." Compared to Huanghuo, Heihuo is indeed a little worse.

Zu Zhi knew Xu You's background well and was not very surprised by these words. Who knows how many things the general has not taken out?

Hu Hongzhi was not so proud of his face and said, "General, this thing is like a magical weapon that is illusory from the universe. If you still think it is not possible, would you summon Lei Gong and burst into a hole in the sky?"

Xu You had just written the explosion equation that Heihuo wanted. He smiled and wrote to him a reaction equation of the originator of the yellow explosion that was later in life, Bitter (this is also banned).

Hu Hongzhi frowned and looked at it for a long time, pointed to one of the symbols, and asked, "What is this?"

"bitterness"!"

Hu Hongzhi was confused.

The bitter taste requires the mixture of concentrated nitric acid, concentrated sulfuric acid and phenol to form. For Xu You, nitric acid is easy to make. The saltpeter used to make black fire is to extract the potassium nitrate, then calcin the potassium nitrate to form nitrogen dioxide, and then blend it into water to form nitric acid.

Sulfuric acid is easy to make. Green alum is a must-have item for alchemists. You can get sulfuric acid by calcining molten water, also known as green alum oil. Hu Hongzhi probably has ready-made ones in his bag.

But concentrated nitric acid and concentrated sulfuric acid are not so easy to deal with.

To make concentrated nitric acid, you must first have concentrated sulfuric acid, and then heat and purify it with concentrated sulfuric acid and dilute nitric acid, which can obtain 90% of concentrated nitric acid.

In other words, if concentrated sulfuric acid is not solved, it will not be able to be made if the yellow fry is needed.

It is too difficult to concentrate sulfuric acid.

Xu You briefly told Hu Hongzhi about the cause and effect relationship here, and said that there is no deadline or goal. If Hu Hongzhi is interested, he can often conduct research here. It is okay to leave, but he must accept secret protection.

Hu Hongzhi pursued Xu Youcheng all his life, so he was counting on Xu Youcheng's loyalty and was willing to leave. He immediately said that he would stay in Tiangongfang forever and take his family to Qiantang to live.

Xu You agreed with a smile.

As a person, he cannot be greedy for the sake of greed. With the granular black fire, it is enough for Xu You to deal with the changes in the current situation. What he needs to do now is not to make yellow fry, but to put forward suggestions for improvement. The first thing he needs to improve is the lead. Soak saltpeter with hemp rope to make the fuse of later generations, as the fuse for detonation, which is safer and more relaxed.

Secondly, Zu Yan strictly records the power of each kilogram of black fire to explode, and digital quantization can be used to use the destructive force of the destructive object, which is more scientific and convenient to use.

There are also some other details, which have been adjusted to a small extent, and at the request of Zu Yan, the black fire must be named Black Sky Thunder.

Afterwards, Xu You announced the martial law in Phoenix Valley and transferred 500 soldiers from Fengying to garrison. From now on, no one except Zuma was allowed to leave. All the people were sent in from outside as long as they needed their lives.

During the martial law, everyone's salary increased five times, and in order to solve the entertainment problem, Xu You taught them to play Goji and Landlords.

Due to the Tianjing Yusuanyuan, Arabic numerals, the so-called Tianjing characters, have been accepted by most people, and it is even easier to make the Doudizhu cards. The first batch of fifty sets were given for free, and soon became popular in the valley.

Of course, given the current situation of the times, all wealthy merchants of aristocratic families were landlords. Xu You decisively changed the name of Doudizhu to Doutianshi, Sun Guan voluntarily named him, and provided free portrait use rights. Anyway, Heming Mountain is so far away, if you have the ability, you come to Qiantang to ask for copyright fees.

Go, Go is so difficult and arrogant, and has always been a high-quality game of aristocratic families. The emergence of Go has given those who cannot learn Go to the strange fun of blasphemy goddess. Although it is not as popular as Doudizhu, it is very popular among those introverted young people.

Therefore, the invention named "Xu Lang" in Jiangdong was added with another "Xu Langbo".

Being, betting, that is, gambling.
Chapter completed!