The barracks were continuous, the training sound of the legion warriors was shocking, and the muddy school grounds were trampled firmly. Patrol squads coming and going, stepping out of the dirt road. The tenacious weeds in the early spring have already begun to sprout on the dirt road.

The daughters of the Silver Crow tribe are arranged to rest in the tree snake city. They had never seen tens of thousands of warriors, and they had never seen Ru Lin's spears and longbows.

After the envoys of the Vasteks left, another envoy from the expedition fleet came and brought the fleet's message and two bamboo baskets with clay pots.

"Your Majesty, these are two new minerals discovered by Deputy Captain Puap in the area of ​​Raven City! The local Vastek people call them 'Black Mud', 'Black Stone' or 'Black Oil'. The Kingdom Fleet The damaged ships are filled with these black stones and oil. They are waterproof and leakproof, and the repaired ships are better than before!"

After Puapu was exiled to Haikou, it was only by discovering the Shenshan Iron Mine with Heilang that he regained the opportunity to recover. Then, he participated in the kingdom expedition, and the old militia brought back various ores and struvite, which was rewarded.

In Puap's heart, "Your Majesty likes strange stones the most, especially those you have never seen before." He knew His Highness's preferences, and he would search for strange stones and minerals wherever he went. This time, after the discovery in Raven City, he also specially dispatched his Prepecha warriors to bring back these two jars of novel minerals.

"Huh? This taste..."

The guard took the two clay pots and carefully checked them before handing them over to His Royal Highness. One of the pots contained black oil, while the other contained oily stones. And when the clay pot was opened, the familiar pungent smell came oncoming, and Shilot immediately instinctively had a memory.

"This is?...Oil and asphalt? Yes, Puap has a heart!"

Shulot raised his brows and sighed in admiration. He was a little surprised, but not unexpected.

Mexico is the seventh largest oil producer in the world. Oil on the Gulf Coast, as well as oil fields on the U.S.-Mexico border, is so abundant that it can come straight out of the ground. It is a pity that although there is so much oil, if you want to carry out crude oil fractionation and refining, you don't know what your life is.

"Petroleum...petroleum!...The black gold that all countries in the future are thinking of, has little meaning to the current alliance. The combustion efficiency of crude oil is too low, and the smoke is too poisonous to be used as fuel... At best, try In order to make Meng kerosene in war. But in front of gunpowder, this has no advantage at all."

Shirot pondered for a moment, and then gave a low voice. The guards took the flammable crude oil away. Then, his eyes turned to another can of asphalt again.

"Natural bitumen. Half and half whetstone."

Sherlot stretched out his finger and carefully stuck a bit of natural asphalt oil, feeling the viscosity of this natural adhesive, and nodded with satisfaction. Then, he picked up another small asphalt stone and put it in the palm of his hand. His eyes flashed, looking at this hard, brittle, water-insoluble, poisonous stone, a strong thought gradually emerged from the bottom of his heart, almost ready to come out.

"... There are many such black oil and black stones in Raven City?"

"Your Majesty, around Raven City, there are several lower valleys that produce such oil and stones. And the craftsmen of Vastek say that in the north and south of Raven City, along the coast, the land stretches for hundreds of miles. There are also many such valleys scattered on the top of the mountain. The boatmen of all departments use this to repair ships."

The messenger bowed his head in reply, and Xiuluo pondered. This piece of coastal underground must be very rich in oil. Asphalt has always been the "brother" associated with oil.

"Natural asphalt is a natural road building material! Asphalt oil can replace cement and serve as a binder for pavement, while asphalt stone can be crushed to replace the finely divided sand and gravel layer. More importantly, in the lush rainforest, Only this kind of asphalt pavement can inhibit the growth of grass and trees and maintain it for a long time!"

Looking at the pottery pot in front of him, the light in Shilot's eyes became brighter and brighter.

"Build the road"! This is a big plan in his heart that he never forgets and has kept for a long time. What he hopes to build is not the kind of simple dirt road, but the kind of Roman stone road, Qin Chi Road, which can connect the north and the south of the world and the imperial artery that connects all the city-states!

However, Central America is located in the tropics, and there are two common terrains: highlands and lowlands. In the rich plateau areas of the alliance, the annual precipitation is above 1000mm, while in the coastal lowlands subject to the alliance, the precipitation is above 2000! Moreover, the rainfall of this intensity is mostly concentrated in the summer rainy season. It is hot and rainy, and the shrubs and weeds on the plateau can emerge in a few days. And the rainforest in the lowland is even more terrifying. The roots of the trees extend rapidly, and the damage to the dirt road is unimaginably fast!

Therefore, to build roads in tropical Central America, it is necessary to have suitable road building materials, and the cost is extremely high.

"Refer to the construction process of Roman roads, and then simplify them appropriately according to the current technical level. Well, at least three layers, two layers of roadbed and one layer of road surface are required!"

Shirot lowered his head, looked at the ground under his feet, recalled the road construction plan he had conceived for a long time, and his chest was surging.

"First of all, the soil surface must be excavated until the hard soil layer. This depth, with the current tools and manpower, can only reach more than one meter. Then, the bottom layer of the roadbed is 20-30 cm thick gravel. Used to level the road and prevent water accumulation.”

"The second layer of the roadbed is more than 60 cm long, filled with large and small stones and gravel clay. It is necessary to lay large stones the size of pumpkins, then fill in medium stones the size of human heads, and small stones the size of cobblestones, and finally fill in finely divided stones. Gravel and clay. In this step, oily asphalt is also added as a binder to replace cement. Or air-dried and crushed stone asphalt is added as a replacement for filling small stones. As for the last layer of pavement..."

Xiulote paused, pondered, and couldn't make up his mind for a while.

The Romans had enough manpower and production tools that UU reading www.uukanshu.com could directly cut giant stone slabs for paving seamless pavements. The Qin Dynasty also had enough technology and manpower to stir-fry the soil, mix it with salt and alkali, and then use countless manual tamping to build a road that will last for future generations. The alliance's current technology and productivity are indeed incomparable with the two.

"If the output of asphalt is sufficient, the roads of the Central American Empire should still be dominated by asphalt and gravel roads! For the convenience of the future, at least two horse-drawn carriages should be built to be four meters in parallel, and small drainage holes should be excavated on both sides. canal."

With this in mind, Shulot looked to the far east. In the mighty Caribbean Sea, there is a big island full of black wealth, which provides a huge amount of asphalt for road construction for later generations. Then, he looked to the southwest, and in the mountains of Colima, there were still active volcanoes erupting, as well as volcanic ash left after tens of thousands of years of eruptions. That's the raw material for making Roman cement.

"Colima... Kingdom Capital... Lake Capital... Crow City..."

Shulot murmured to himself, an imperial artery with a distance of 2,000 miles from east to west was taking shape in his mind. It will take many thousands of manpower, many ship materials, many years, and supreme power to penetrate the world!

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