The procedure for making bricks has been worked out, and everyone is proceeding step by step, and Wang Tian does not need to interfere more.

Wang Tian told everyone to pay attention to rest, and when they were tired, they would stop and drink water and rest for a while before continuing to work.

There is no table salt yet, and it is easy to get tired after engaging in high-intensity physical labor for a long time, so it is very important to replenish water in time, but because of the electrolyte imbalance in the body due to lack of water, it is easy to get heat stroke even if it is autumn.

The brick-making has been carried out like flowing water, and the pottery has been burned on the fire, Wang Tian stood on the stone pile just erected to see the situation in the pottery kiln, and the situation was normal.

When Wang Tian lowered his head and walked down, his eyes fell on the stone under him, he picked up a stone and examined it carefully, and found that this was limestone, limestone is very widely distributed in China, as an important building raw material, it is the ideal binder that Wang Tian can get now.

According to different shapes and other characteristics, limestone is also called calcite, marble, chalk, aragonite, etc. Different types, if you want to make lime, you need different temperatures and burning times.

In general, lime is the most readily available building material, and it can be obtained by firing directly from wood at room temperature.

Now the kiln and brick making themselves are not compatible. It's a good time to try firing lime.

Wang Tian called Kuroko over, and the two of them used the pit where the charcoal had been burned to bring large pieces of wood, one by one into a tic-tac-toe shape, and when the height reached 20 centimeters, they pressed a layer of limestone on top of him, until all the stones that had been piled on both sides of the kiln were used up.

A total of five piles are piled up, each about a meter high. Find some thatched leaves and dead branches that are easy to ignite, and stuff them into the cracks of each layer of wooden frames. Then take the fire and light it from top to bottom.

A moment later, five pillars of fire were blazing, and from a distance, people who didn't know the details thought that some kind of sacrifice was being held here.

When the leader and a group of resting people saw it, they came to see what it was, and they didn't know what they were doing during the day. What is the use of stones and can't eat barbecue stones?

The leader raised his doubts like Wang Tian, and Wang Tian said: "Make lime and use it to build bricks and walls." Seeing that the leader was still puzzled, he continued to explain: "The bricks are small pieces of bricks, and if they are piled up together, people or animals can easily destroy them, but this kind of stone can be turned into a white powder after burning, and this powder is mixed with the sand by the river and the clay we use to make bricks now, and after a period of time it will harden and become like a stone." It is possible to connect bricks to each other into a whole. "To put it simply, he can turn these bricks into a big rock so that no one can move it." Wang Tian tried his best to explain it to the leader again in a way that he could understand and in plain language.

Kuroko carefully memorized what the Son of Heaven said, and then translated it to the leader with his own understanding. In fact, he himself didn't understand very well, to build a wall, you need lime, so just use stone, why burn it again?

Wang Tian saw the confusion in Heizi's eyes, he didn't even understand the translation, and then through him to paraphrase it, it was strange that the leader could understand.

Do more things and talk less, Wang Tian didn't explain again, only said that he would test it for everyone after the lime was burned. He glanced at the bricks that had been made on the brickyard, there were thirty-two in total, and looked up at the sun, it was about ten o'clock in the morning, that is, forty-one adults, plus thirty-nine minors, made sixteen pieces per hour, of course, today has just begun, the people in the early stage were leveling the land, erecting water sources, plus the initial unskilled, it is estimated that the same number of people in the future, the production capacity per hour can reach fifty to sixty bricks, according to the calculation of eight hours a day, can produce four hundred to five hundred bricks a day, It takes about eight to ten days to complete the production of bricks.

The firing time of red bricks also takes two to three days, and the cooling time also takes one to two days.

If the firing of limestone is small, such as the batch of today's experiment, it will take half a day, but if it is a large stone as a whole, the firing time will also take 2 to 3 days, and the cooling time may take longer.

In this way, it takes about fifteen to twenty days just to prepare the materials.

After building the wall, a skilled bricklayer in the city can make eight to twelve square meters a day, of course, this refers to the use of standard small bricks (240×115×53 mm) and the size of the bricks of his own tribe is nearly twenty times that of later generations. If later generations of bricklayers used this kind of brick to build walls, it is estimated that one person can make 200 square meters a day. This 70x4 meter wall of my own tribe can be easily done in one day with three people.

According to the calculation that each person in the tribe can build ten square meters per day, thirty people can repair it in one day. This of course does not include the work of blending lime and erecting scaffolding.

In other words, it is estimated that it will take about 30 days from making the bricks to building the wall, including repairing the gate.

Wang Tian asked the chief how many days will there be before the first snow of the year?

The leader did not understand the concept of "heaven", and Wang Tian explained to him that it was a solar day.

The leader thought for a moment, and stretched out ten fingers at Wang Tian, a total of six times.

Sixty days? There were still two months to go, one month to build the wall, and the remaining one month to gather food, sew hides and clothes, and search for crops and vegetables that could be cultivated.

After everyone rested for a while, they went back to continue stacking bricks, and Wang Tian saw that there was nothing to do with himself here, and he planned to be the shopkeeper. He told the sunspot to be optimistic about the pottery kiln and keep the two pottery kilns in a state of fierce fire. Then he staggered back to the cave.

In later generations, Wang Tian once accompanied a friend to a pottery bar to play, that is, to knead some pottery and porcelain by himself, and then use the machine kiln provided by the merchant to fire it.

I remember that the merchant said that it would take 16 hours, because it had to be warmed up, dehumidified or something. It seems that the pottery will not be out of the kiln until tomorrow.

As he walked, Wang Tian thought about the pottery making experience that later generations knew, but found that it was useless.

In a frustrated mood, he has come to the observation deck, the slow pace of primitive society, for a while Wang Tian is at a loss, he is too eager to do things at once, but he is not in a hurry!

If he is not in a hurry, then he is not in a hurry at all, he walks to Xiao Ling and sits down, there is nothing to do, then he will make a flower basket! Who called in this era there are no mobile phones, computers, the Internet. Then quietly be a little boy weaving flower baskets.