Concrete was a rarity in the world, but in ancient times, it was a rare object.

Li Canghai did not come from an architectural background, and he did not know the formula of concrete, but he still had some understanding of the structure of concrete.

The so-called 'concrete' is nothing more than a mixture of water, stone, soil and other substances, and the most important thing is the 'water-cement ratio', that is, the ratio between the mixtures.

He dug more than a dozen shallow pits just to save time by conducting experiments at the same time.

After all, the Yellow River said that flooding would flood, and he didn't have more time to carefully study the formula of concrete.

An hour passed quickly, and there were more than a dozen shallow pits, and nearly half of the mixture hardened, but the strength was far from enough.

Li Canghai was delighted, which showed that his idea was feasible, although the concrete lacked cement, but the condensation effect was obvious.

He readjusted the proportions according to the previous calculations, and this time he was so confident that he selected a few possible proportions and looked at them carefully.

It wasn't until night fell that Li Canghai finally found the right proportion.

He let out a long breath and burst out laughing.

Chang Feng and the others were stunned by his sudden laughter, and surrounded him one after another.

"Your Excellency...... Are you alright? Chang Fenghu asked suspiciously.

"I've found the recipe, hahaha!" Li Canghai danced excitedly.

Several people looked at each other, Xiao Wu thought he was going crazy, and hurriedly reached out to feel his pulse, wanting to diagnose him.

"My lord, what recipe have you found?" Zuo Hongji asked in surprise.

Li Canghai realized that he was a little out of shape, and coughed a few times, and he said excitedly: "The formula for plugging the gap method!" Chang Feng, where did you get this clay from? ”

Bending down and grabbing a handful of clay on the shallow pit in front of him, Li Canghai turned to Chang Feng and asked.

In the course of the experiment, he discovered that in addition to the configuration ratio, there is one most important thing, and that is the soil.

Different soil quality, the degree of hardening of the concrete made is not the same.

The pile of soil in front of him was very different from the others, and it contained sedimentary rocks.

Li Canghai did not know that this sedimentary rock belongs to marl, which is a kind of natural cement, which has good hydraulic hardness and rapid condensation characteristics, and is most suitable for applications in contact with water.

He didn't know much about the formula of concrete, but he stumbled upon the key to it, and with this kind of marl, he had the confidence to block the breach.

"Lord Hui, all around here are flooded, this is the soil dug from the mountain." Chang Feng replied honestly.

"Chang Feng, from now on, you take people to dig up as much of this soil as possible. Also, break all the stones. Li Canghai commanded.

Chang Feng didn't dare to slack off, and immediately took the order to leave.

Li Canghai groaned, he took out the official talisman and said: "Xiao Wu, you take my official talisman and drop all the manpower of the county government to help here, and you go to collect as many big ships as possible, remember, you must have big boats." ”

Although Xiao Wu didn't know what he meant, he didn't hesitate at all, and after taking the official talisman, he left in a hurry.

"My lord, the grass people don't understand, what does this have to do with plugging the leak?" Zuo Hongji said with a puzzled expression.

Li Canghai smiled slightly and said, "When the time comes, you will know." By the way, do you know where there is a lot of lime? ”

"The grass man knows a merchant who has a lot of lime, and if the adults want to use it, the grass man can go and talk to him." Zuo Hongji said.

"In that case, then it's hard for you to make a trip." Li Canghai patted him on the shoulder and said.

"Where do the adults say, the grass people know that everything the adults do is to block the Yellow River breach, and it is really a blessing for the grass people to be able to work for the adults." Zuo Hongji bowed deeply to him and said with a solemn expression.

Li Canghai nodded with satisfaction, he took out a half-finger-long brocade box from his arms, handed it to him, and said deeply: "Knowing that mistakes can be changed, and good is great." The official did not hate the merchants, the merchants could promote the prosperity of the region, and the officials even encouraged the people to do business. However, the official does not like black-hearted businessmen who make money without conscience. ”

Zuo Hongji hesitantly took the brocade box, he opened it and looked at it, and the whole person was stunned.

What was in the brocade box was the 'snail jade' he gave to Li Canghai before!

"Your Excellency...... This. Zuo Hongji looked at him in amazement and wondered.

Li Canghai smiled indifferently and said: "This thing belongs to you, and now it's just a thing to return to its original owner." This official is not the kind of corrupt official who sees money, and if he accepts this thing from you, isn't he suspected of taking bribes? 'Luohua jade' is a treasure of the world, whether to buy or keep, it is all up to you. ”

Zuo Hongji suddenly knelt down with tears in his eyes, and kowtowed to him a few times, Zuo Hongji had red eyes and said gratefully: "My lord, you are the reborn parents of the grass people, please be worshiped by the grass people." ”

Zuo Hongji never dreamed that Li Canghai would give him the 'Luohua Jade'.

Since last night, he has scattered all his family wealth, and his servants and concubines have left him, and those friends who drink and meat on weekdays have avoided him like a plague god, making him sigh that the world is hot and cold.

Now, Li Canghai has given him a chance, how can he not be excited?

Li Canghai helped him up and said seriously: "With your ability, it is not impossible to make a comeback." The official still said that people, do not be consumed by the desire for profit. ”

Zuo Hongji wiped his tears and said solemnly: "Don't worry, my lord, after this incident, the grass people have a very light view of money. The grass people must remember the teachings of the adults and be a conscientious businessman. ”

Li Canghai nodded slightly, and he said in a deep voice: "Right now, we need to work together to deal with the floods, you go early and return early, and transport the lime as soon as possible." ”

Zuo Hongji put away the brocade box closely, made a big salute to Li Canghai respectfully, and left the Dragon King Temple in a hurry.

At this time, night falls.

Around the Dragon King Temple, a lot of coolies gathered.

Most of these coolies were Wang Buquan's forces, and after being wiped out by Li Canghai, they were all pulled here for rescue, and the other part were the people of the nearby villages of ten miles and eight villages.

The flood has been going on for seven or eight days, and no one has cared about it, but since last night, hundreds of people suddenly came, saying that they were ordered by the new county commander to come to the rescue.

There were still some people in the vicinity who had not fled, so they came to help.

After all, this is where their ancestors lived.

Countless torches were lit around the Dragon King Temple, and the red fire light was reflected on the water surface in front of the Dragon King Temple, forming a staggered fire spectacle up and down.

The sound of clanging stones came and went, and everyone was busy.