"The prince said that inside the cement pillars, a square type of thick iron wire should be tied, all of which should be tied, and then filled with cement, but it should be remembered. Can't be numb! ”

"Yes, old king, we know."

"Alas, the prince is really generous, so many houses have to be made of wires, as if what is he talking about? To resist tensile forces? I don't understand, but it's right to listen to the prince! ”

"It's all good iron, if it's used to fight weapons, the armor is good, I'm really reluctant."

"Lao Liu, you are a blacksmith, hahaha, are you thinking about your profession again? Don't worry, the prince said, we can take back the extra scraps of iron and make it ourselves. When the time comes, how many kitchen knives and farm tools will you give us? ”

"Okay, no problem. My family is an ancestral craft, but I have to be paid, heh! ”

On the construction site of Huishan Real Estate, a group of craftsmen and workers are working in full swing, chatting and cheering each other up. They don't quite understand why such a new thing as cement should be made with wire.

However, this did not prevent them from faithfully carrying out Zhu Zilong's orders.

In fact, if it weren't for the Song Dynasty, the price of steel was really against the sky, and the quality was not very good. In fact, as a modern traverser, Zhu Zilong originally wanted to mix steel wire in cement, but obviously he can't achieve it now.

If you really want to forcibly make steel wire, you can do it, but the quality is not much stronger than iron wire, and the price of steel in the Song Dynasty is estimated to be bankrupt.

In desperation, Zhu Zilong had no choice but to use wire.

For why put steel bars or iron wires in cement, that is because concrete can withstand a lot of pressure, but the ability to resist tensile force is very low, generally only 1/10 of the compressive capacity, it is easy to break when it is tensiled, which greatly limits its scope of application.

If the tensile part of the component is equipped with a material with strong tensile resistance - steel bar, and the steel bar and concrete form a whole, the force is common to make them exert their respective strengths, both compression and tension. Therefore, it is beneficial to put steel bars or iron wires in the concrete, which is beneficial and harmless!

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"Lord Wang, this is the total amount of iron wire we purchased from several large workshops and the court workshop through the help of the people from the Ministry of Household and the Ministry of Industry, as well as the price list, please take a look!" Steward Jin handed over an account book to Zhu Zilong.

Zhu Zilong swept the ten lines at a glance and closed the account book.

As a person who lived in a small county town at the junction of urban and rural areas in his hometown before crossing over, many of his relatives' homes were built by themselves. In the past, he also went to help or work, so he is also a semi-professional in moving bricks.

The amount of steel and cement used in self-built houses needs to be based on the construction requirements (slump, whether pumping, etc.) and the specific situation of the materials you use (what grade of cement, the variety of cement; the amount of mud content in the gradation of sand and gravel; ），

The final mix ratio can be determined only after the trial. However, in the structural design, there is a probability that according to the standard design frame structure of 500kg/square, the weight of the steel bar is 50kg/building square meter.

Well, in layman's terms, 1 square meter of 24 walls requires 15.7Kg of cement, 84kg of sand, and 127 ordinary red bricks.

A square meter of building is 0.25 square meters of concrete, 400kg of cement is needed for one side of concrete, and 100kg of steel is needed. Taking the construction area of 225 square meters as an example, the amount of cement is 90 tons and the steel bar is about 22.5 tons.

Of course, he is now building bigger than the previous ones, and he still uses double bricks for safety. Because iron is inferior to steel, the amount of iron must be doubled.

Overall, it can be said that the investment is not small.

"Fortunately, this Nima traveled to the Song Dynasty, if it was other dynasties, Lao Tzu really didn't have the confidence to build a cottage of modern cement high-rise buildings. Not to mention the high price of iron in other dynasties, the output alone is not enough to build weapons, how can I waste a lot of money on this? Zhu Zilong muttered softly in his heart.

Throughout Chinese history, the shift from handicraft to large-scale machine production began in the eighteenth century.

The modern iron and steel industry in New China began with the construction of the Hanyang Iron Works in Zhangzhidong in 1890. However, before the liberation of old China, the iron and steel industry base was very weak, and the production capacity was low, and 1943 was the year when old China produced the most steel, and the output was only 923,000 tons.

The production in peacetime has been halved, and the production in wartime is only a quarter of the normal, so you can imagine how many cups it is.

On the other hand, what about the Song Dynasty at this time?

Since the 3rd year of Song Xining (1069), the imperial court has set up 126 coinage prisons throughout the country, with more than 50 million copper coins and more than 8 million iron coins (an increase in the Southern Song Dynasty).

Of course, the Song Dynasty's iron money added a small amount of tin - about 120,000 tons of iron was consumed, and this was only the medium-term level. At its peak, the folk, the Song Dynasty was relatively wealthy, and the iron production was not bad.

Commoners must have a large number of iron tools in their hands, merchants have scales, scissors, etc., farmers have iron farm tools, Quyuan plows, etc. - the most important thing is that there must be iron pots, kitchen knives, etc., an iron pot has 15KG (ancient technology), and there are also a lot of iron for agricultural tools such as Quyuan ploughs - at least 30KG per household on average.

At the end of the Northern Song Dynasty, there were 51 million registered households, with about 1.63 million households. That's not counting the amount of iron owned by the black population!

Compare it with the period before the liberation of old China and the Republic of China.

In 1927, it was just over 900 tons; (The 27th year of the Republic of China, that is, 1938, counted from 38 years)!

Until 1934, the annual output was only 12,048 tons. In this proper Republic of China period, even the iron production of the ancient Song Dynasty was not as good!

It can be seen that the so-called productivity of the golden decade of the Republic of China basically stayed in the era when it was not as good as in ancient times. War is indeed the great cause of destruction, and only peace can develop the economy.

At that time, Japan's total steel output in eight years was more than 1,000 times that of China, while the United States was more than 10 times that of Japan (equivalent to 10,000 times that of China), and even Russia was more than twice that of Japan, and Germany was more than three times that of Japan. No wonder China let these powers beat them one after another!

The so-called great development of industry and commerce in the Republic of China is nothing but a dream.

The so-called industry and commerce are basically spinning and flour industries that rely on the sale of agricultural products such as tea and silk, or the purchase of Western machinery by capitalist compradors who have become rich by mining resources. Because these two industries are the most popular, they make the most money and the fastest.

The real root of national industry, heavy industry is almost zero, because it cannot produce steel, so it cannot make any aircraft cannons, and even the ability to produce bullets is extremely low. Indirectly equivalent to the semi-colonies of the great powers!

Under such circumstances, our Red Army and the Eighth Route Army did not rely on foreign powers. A lot of gun steel, knife steel and other production tools are made by ancient methods, and the quality is okay -

Therefore, it is possible to produce more steel with enough skilled craftsmen to replace semi-industrial production. The key depends on the demand, and it is clear that the Song Dynasty met these conditions!

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