After obtaining two excellent building materials, sintered brick and lime mortar, Dai Yan was not satisfied. Pen × fun × Pavilion www. ｂｉｑｕｇｅ。 infoBecause for the factories and some special buildings in Taoqiu, a stronger house had to be built to meet the requirements.

Under such circumstances, Dai Yan began the development and production of new building material cement.

Dai Yan still knew something about cement in his previous life, which is a mixture composed of silicate.

The production of cement has three steps: "two grinding and one burning".

The first is to make cement raw meal, which is to mix limestone, clay, iron powder and other raw materials in a certain proportion, grind them finely and blend them into cement raw meal with appropriate composition and uniform quantity and quality, which is a grinding.

Subsequently, the obtained cement raw meal is put into the cement rotary kiln, and after calcination at a high temperature of about 1350-1450 degrees, cement clinker is made, which is a firing.

Finally, the obtained cement clinker is added to a certain mixture, such as slag, coal ash, etc., and then gypsum is added to mix and grind, which is the second grinding. After two grinding and one burning, the finished cement can be obtained.

It seems that the production of cement should be very simple, but in fact it is not. When grinding raw meal, a powerful vertical mill is required; When grinding clinker, a ball mill is required. These two mills have extremely high requirements for both rolls and mill power, and they almost can't get qualified products!

In order to solve the problem of power, Dai Yan had to ask the disciples of the Mo family to develop a waterwheel with greater power, and two kinds of mills were driven through the waterwheel. However, the power generated by the waterwheel is completely dependent on the flow rate of the water, and in general, the cement plant only gets a barely qualified raw meal and clinker half the time.

And in order to get high-quality rolls, it is also from the steel smelted that the best steel is selected, so that it barely meets the standard and gets the right rolls.

And the calcination of cement is not an easy thing to solve! The calcination temperature is higher than that of sintered bricks, and in all the industries of Taoqiu at present, it is almost second only to the smelting of steel, and to get such a high temperature, it is necessary to use high-quality coal as steelmaking! As a container for cement calcination, the choice of cement rotary kiln must also be carefully considered.

Dai Yan wanted to choose to use steel at first, but at 1350 degrees to 1450 degrees, although ordinary steel has not been melted, its properties have begun to become soft, such a rotary kiln, Dai Yan is always worried that it will explode, so he does not dare to use steel to make it.

The only thing that can be used is the graphite crucible material, which is the same material used for steelmaking.

As a result, cement rotary kilns have become expendable, as have iron-making crucibles. As a result, the cost of cement becomes extremely high, almost as much as the cost of steelmaking!

In such a situation, Dai Yan's enthusiasm for cement is far less than that of sintered bricks and lime mortar, and for the application of cement, he only uses it in a few extremely important places, such as as the material of the Taoqiu riverside dam, or when building high-quality factories!

More often than not, he will use cement, aggregate and steel together, so that he can get a small amount of high-strength reinforced concrete! This kind of high-strength building material makes the high-strength project of Taoqiu finally have qualified building materials!

With three kinds of building materials, Taoqiu City finally has a solid material foundation for large-scale infrastructure construction.

When Dai Yan planned the layers of buildings and fortresses outside the south and west cities, he once demolished all the shantytowns near these two walls, and the common people who had been displaced from various countries to Taoqiu were all centrally managed, so that they could live in this vast area surrounded by the east city wall, the north city wall, Jishui and Heshui!

He first invested heavily in building many simple houses in this area, and then demolished the entire shantytown, so that all the people of these shantytowns moved to the house and left, and then charged these people high rents!

Those who are extremely reluctant to relocate and unwilling to pay high rents, Taoqiuyi Mansion will directly regard them as unstable elements! The only fate that awaits them is expulsion!

Such a policy is no problem for this era, after all, a foreigner came to the territory of Taoqiu in the Song Kingdom, not only did he work hard, but also wanted to disturb the peace, such a person Taoqiu would not tolerate it!

As for the common people who live in the house, in order to be able to better integrate into Taoqiu and want to get the house that belongs to them, then they must continue to work hard! Some of them sold coolies as porters on the wharf, some worked as workers in various factories in Taoqiu, some were absorbed by major trading houses and went to various places to open up markets, and some joined forces with others to go to Yancheng to join the whaling and sailing team!

As a result, the whole Taoqiu has become a fierce competitive atmosphere, and the pace of the whole city is getting faster and faster, and anyone who comes to the city knows that they have to work hard to gain a foothold in the city! And this area located at the junction of the Song, Shandong, Qi, Wei and Wei states, the commercial center of the world, has begun to become more and more attractive to merchants, commoners and even nobles from surrounding countries!

Under the planning of the high-level of Taoqiu, the expansion of the city has also become neat and orderly, and the population has also begun to increase!

From the initial population of 300,000, it quickly increased to 400,000, and then from 400,000 to 500,000, thus surpassing Linzi! The Great Taoqiu area, centered on Taoqiu, has become the largest city in the world!

Some of the original industries in Taoqiu have also become larger and larger due to the gradual increase in population. Those emerging industries have also continuously driven the economic development of Taoqiu, making Taoqiu's population more and more.

Population and economic development complement each other, thus creating a virtuous circle for Taoqiu. So that the whole Taoqiu has formed a pattern of "the stronger the stronger"!

All these changes made the common people of Taoqiu, and even the scholars and rangers who followed Dai Yan extremely happy, thinking that there was no one in the world who was good at governing that could surpass Taoqiu Jun!

For such a toution, Dai Yan has not lost himself, for him, his goal at this stage is far from being completed!

He wants to make Taoqiu the number one city that really affects the world! To achieve such a goal, he has set Linzi as his real goal!

If you want to surpass Linzi, you must be able to surpass Linzi's Jixia Academy, and you must be able to surpass the influence of Qi State!