Rebirth before the doomsday: I quietly emptied the city of supplies

Generally, when the base of a house is made of porous, water-absorbent material, or when construction is carried out under dry and hot conditions, lime mortar with high fluidity should be selected.

However, when used in construction, the water retention of lime mortar must be fully considered.

Water retention refers to the ability of lime mortar to retain moisture. Mortar with poor water retention will ooze water and flow during use, resulting in a loose bond between the mortar and the base.

Moreover, since water loss affects the normal bonding and hardening of the mortar, the strength of the mortar will be reduced.

The main factors affecting the water retention of mortar are the type and amount of cementitious materials, the type, fineness and water consumption of sand.

By adding powdered mixed materials such as lime paste and fly ash into the mortar, the water retention of the mortar can be improved.

High-viscosity polyacrylamide with good water solubility can significantly improve the construction and workability of cement mortar without damaging its mechanical properties.

The premixed mortar has the advantages of long and adjustable setting time, good water retention and less water seepage over time.

However, Chen Yu and his team are now on this deserted island with limited conditions, and making the lime mortar is already a very difficult task.

Chen Yu put the lime paste aside, and then scooped out the fine river sand from the foundation.

According to the specific proportions, Chen Yu quickly mixed the lime paste and sand evenly.

As he said in his article, lime mortar with good adhesion is now available!

Afterwards, Chen Yu did not build the wall directly, but cut down more than ten dry tree trunks that had good water absorption nearby.

He wanted to use the wood to make floors that would be moisture-proof and waterproof and absorb excess moisture from the ground.

The foundation pit had been dug out last time. Now Chen Yu only needed to fill the pit and lay the foundation!

Because there was no reinforced concrete to make a stable foundation, Chen Yu had to fill the foundation pit with lime mortar mixed with bricks.

Construction is easy to say, but it is a life-threatening job to do it!

After Chen Yu mixed the lime mortar together, he went to the river to find some pebbles, because cement mortar alone was not enough.

To build a solid foundation, reinforced concrete is indispensable, but now they are limited by conditions and cannot find so many building materials. Therefore, using local materials has become a key issue, and the pebbles by the river are the first choice. Pebbles have very good thermal conductivity and are most suitable for this kind of use. Although the weight of a single pebble is very small, when Chen Yu picked up the pebbles and piled them up. Finally, when he carried them in his backpack, he found that the density of these stones was very high. This reminded him of the teacher's words in class when he was a child that unity is strength.

Just like these pebbles, the mass of a single pebble is very small, but once gathered into a pile, even Chen Yu, whose strength far exceeds that of an ordinary person, can still feel heavy. The location of the shelter this time is very good, and the geographical location is very advantageous. On the flat ground far away from the river, Chen Yu has already carried all the pebbles needed to build the foundation.

Although it is just a small foundation and there is not much work to do, it is a huge workload for one person and the efficiency is very low.

Chen Yu was busy from morning until ten in the afternoon and never stopped his busy pace.

The lime mortar has been mixed by it, and once the pebbles are in place, the foundation can be laid immediately.

Once the foundation has been laid, bricks and stones cannot be piled on it immediately.

You need to wait until the gel material used for laying the foundation has completely solidified before you can start laying the walls on it.

If the foundation is not solid, building walls on it will have a counterproductive effect.

Such a foundation can crack at any time with just the slightest shock or shake.

Once the foundation cracks, it may cause the house to collapse at best, or even cause loss of life at worst.

Therefore, laying a solid foundation is very important for construction.

Although Chen Yu's foundation is not as solid as the reinforced concrete in society, compared to people in primitive society who did not lay foundations, theirs is already very solid.

By the time Chen Yu had completely melted the materials and filled the excavated foundation pit layer by layer, the sun had already set. It seemed that today's construction could only stop here, after all, the wall could not be built immediately.

We also need to wait for the lime mortar of the foundation to solidify slowly. When the area is completely solidified and the hardness reaches a certain level, bricks and stones can be piled on it. The sky has gradually darkened, and winter nights always come very quickly. Although the cold wind has been howling, Chen Yu did not feel cold.

The intense work made his body covered with fine beads of sweat, and the cold wind gave him goose bumps. Even if his body had a strong resistance to cold and heat, he still felt a little uncomfortable being naked in this cold winter. However, Chen Yu's change was not caused by feeling cold, but a perception of environmental changes. Although his body had a strong resistance to cold and heat, he could still perceive the temperature change.

If you lose your sense of cold and heat because of your increased resistance to cold and heat, it would be a loss! After finishing the cleaning, Chen Yu did not leave immediately.

Because it was used up yesterday, but when he cleaned up the earth kiln in the morning, he had already burned out today's lime. Now a day has passed, and coal has been added several times in the process of laying the foundation. Now the lime is almost burned, because there is no place outside that can shelter from the wind and rain. So Chen Yu did not rush to take out the lime burned today.

After seeing that it was completely burned, Chen Yu found two wooden boards and covered the exit of the earth kiln to prevent the lime from being damaged by rain. After preparing all this, Chen Yu returned directly to the shelter.

When Chen Yu returned to the shelter, Ling Qing had already prepared the meal. She Er and Ban Ban had returned earlier than him. They were jumping and playing around the dining table, waiting for Chen Yu to come back and prepare to eat. Although She Er had a high IQ, he still couldn't change his snake habits.

And for some unknown reason, Chen Yu felt that this guy's temperament seemed to have become much more cheerful. He wandered around with Banban all day long, appearing and disappearing mysteriously.

It was already late at night after dinner. After a day of intensive work, even though Chen Yu had such a high physical fitness, he still felt waves of fatigue.

In fact, although Chen Yu's personal fighting power is very strong, facing this kind of continuous force, it would be difficult to overcome even if his physical fitness was doubled.

After all, being strong is one thing, but the load on the body caused by long-term continuous force output will not be reduced because of strong strength. Moreover, this kind of continuous labor consumes a lot of energy!

That is Chen Yu. If someone else came, he would definitely not be able to bear such high-intensity labor. In society, most people will choose a professional construction team when building a house.