The reconstruction of the buffer city is planned to be half a month later.

The outdoor temperature rose from the original minus 35 degrees Celsius to minus 14 degrees Celsius.

The buffer city wall was built at an average speed of one meter in two days, from the original eight meters to the height of 15 meters.

This wall is the fastest construction speed since its construction.

If the temperature was not still below zero, the construction speed might be faster.

But similarly, the number of people participating in the construction has reached a historical peak. The entire buffer city has reached a huge number of 140,000, and almost all vehicles and equipment in the oil city and trading market have been used.

In order to speed up the cement solidification, they adopted various methods:

1. Add chemical accelerators: such as calcium chloride, ammonium sulfate, sodium carbonate, etc.

2. Increase the cement temperature and add hot cement or hot water to mix it.

3. After the cement grouting is over, use a hot air fan to increase the cement surface temperature and promote solidification.

March 3rd.

All the snow in the buffer city was cleaned up this day. After the snow was cleaned up, all the remaining manpower was concentrated in the construction of greenhouses.

The reason why building walls no longer adds manpower is because there are enough people, and it is meaningless to come to more people.

With the joint efforts of so many people, the first batch of ten greenhouses in Kuangcheng Greenhouses were completed, and all the internal equipment and water and electricity were installed.

Uncle San asked the planters in the Petroleum City to start planting immediately.

Previously, a group of planters were supported from the headquarters base, including Bai Yuzhi and Hu Zhen, the favorite students of agricultural professor Zhang Qiwu, who have been in charge of the ancient tomb plantation in the Oil City.

Later, many people with planting experience were absorbed, such as Zheng Hanbing, who opened a green greenhouse agricultural company before the end of the world, and Chu Juan, professor of botany...

in addition.

As the temperature rose, more and more zombies came from outside.

However, after these days of practical exercises, all combat teams in the Oil City have been trained and their practical capabilities have been greatly enhanced.

In the south of the buffer city, Fang Jingxin frowned when he saw only a small pile of limestone left in front of him:

"That's all left?"

The supervisor next to him nodded nervously and said:

"The consumption has been high recently, that's all."

"Oh... there is something big about it!" After Fang Jingxin left this sentence, he hurriedly walked towards the construction site of the Breaking City Wall.

On the wall construction site, Xie Changshan is supervising the work himself.

"General Engineer Xie, we have not enough cement."

"If you don't have enough, just give birth!" Jie Changshan glanced at him inexplicably.

Fang Jingxin replied helplessly:

"There are other materials for making cement, but there is not enough limestone. According to the current consumption rate, you can only last for another two days at most, and the supply of cement will be cut off."

The most important material for building buffer city walls is high-strength cement.

Limestone is the most important raw material in cement production, accounting for 60% to 80% of cement components.

In short, walls cannot be built without cement, and cement cannot be produced without limestone.

They rarely stock up on cement, which has a shelf life, but limestone can be stocked on it.

Limestone itself does not react directly with water. What reacts with water is actually quicklime produced after high temperature calcination.

Limestone is relatively easy to store.

They had stored a lot of quicklime before, but they couldn't withstand the huge consumption recently.

Jie Changshan frowned after hearing his words.

If the cement supply is cut off in two days, the entire buffer city wall will also stop building, which has a huge impact.

Thinking of this, he ran off the construction site.

He walked to a car and looked at Fang Jingxin behind him, "Why are you standing there? Get in the car!"

The construction site of the buffer city cannot be stopped. Now the daily temperature is gradually rising. They must try to increase the height of the buffer city wall.

But now there is a shortage of raw materials, and it is hard for a good cook to cook without rice.

He couldn't handle it, so he could only find the minister to solve it.

soon.

They arrived at the Oil City.

"What? Suspension of work?" Uncle San was not very acceptable after learning the news.

Now is the time to do your best at work. Tell me to stop work?

The terrain of the oil city is relatively low compared to the surrounding area.

Especially when the two rivers from Jigong Mountain are warming up and the snow melts, the flood will inevitably break out.

The water from Nanwan Lake, ten kilometers away, is formed by converging from one of the rivers.

After calculating hydrology and geographical altitude, the buffer city wall must reach at least 15 meters in height so as not to be flooded by flooding the buffer city wall.

It is now fifteen meters high, but they cannot guarantee that they can only increase the height of the buffer city wall as much as possible. Otherwise, once the wall is submerged and rush into the buffer city, the greenhouse will be useless.

Uncle San peeled off the citrus orange peel in his hand, with a serious look and a firm tone:

"No, work must not be stopped!"

He raised his head and looked at Xie Changshan and asked:

"I remember there is a limestone mine near our oil city?"

Before coming, Jie Changshan had already figured out where to get limestone from.

"Yes, Shangxian is farther away and Xinxian is nearer, about 75 kilometers away from the Petroleum City."

Uncle San waved his hand,

"Then I'll send someone out to dig out the limestone mine. There are only two tons of black gunpowder left from the headquarters base before, so I'll use it to open mountains and explode stones."

"You go back first, I will contact someone to resolve this matter."

"Okay Minister." Xie Changshan nodded and turned away.

There are still some limestones that are enough to support two days, enough to support them until the new limestone is mined back.

After Jie Changshan left, Uncle San stuffed the peeled citrus pulp into his mouth one by one.

On the side of the window of the heating room, there is a row of citrus peels, which have been air-dried.

Uncle San quickly contacted Ju Tianrui and Lao Luo and asked them to send two militia brigades to lead the previous mining team out to dig out limestone.

Xinxian is not far from the Oil City, and it can be reached within two hours of driving.

Although the limestone mine was frozen by ice and snow, they had black gunpowder in their hands and needed to continuously blast them to save a lot of effort.

After explaining, Uncle San put the leftover orange peel on the windowsill casually.

I have been getting hot recently, so I used dried orange peels to make tea to reduce the heat.

......

From Huashan to Oil City, it is nearly 600 kilometers.

These days, Jiba and the old Taoist priest glided daily, walking for about ten days at an average speed of 55 kilometers per day.

Their speed is actually quite fast.

Although it slides faster in the snow, it is slower when it comes to uphill.

But now the ground is covered with snow, and fewer zombies are encountered on the ground.

Even if they encounter it, they can quickly shake the zombies off by skiing.

It's late at night.

ZMD city center in the north of Xinyang, the top floor of Zhongnan City Garden.

Jiba broke the decaying desk board and threw it into the fire in the center.

"Master, we should be able to go to the Oil City tomorrow. When we arrive at the Oil City, I will invite you to drink. I will meet many friends there, and then..."

"Master, are you hungry? Why don't you eat some compressed biscuits?"

"Master, are you asleep?"

......

Seeing that the master ignored him, Jiba leaned against the wall behind him, looked at the toilet opposite, and gnawed on the corn cake.

There is no way to stay here.

After so many years, the window glass of ordinary buildings has long been broken.
To be continued...