Fortunately, Marin discovered the problem early, before the Beihai Kingdom began to pave cement pavements on a large scale. So, everything is in time.

In fact, these days, because there are no heavy vehicles, the requirements on the road are actually very low. Under normal circumstances, even if you do not add "bones", it is difficult to crush the cement pavement.

However, in this era when there are no heavy vehicles, the real enemy of cement slabs is probably not the pressure of the vehicle, but the thermal expansion and contraction of the internal structure or the huge vibration. This is because this creates internal stresses and shear forces, which cause cracks in the cement slab.

In winter, cement shrinks due to thermal expansion and cold contraction, and the internal shrinkage force is generated, which is most prone to cracks. Once a crack is created and a heavier wagon runs over it, it may cause the crack to expand. Then, until the cement slab breaks completely......

That is to say, the main purpose of adding fiber "muscles and bones" is not to be afraid that the strength of the cement board is not enough, but to be afraid that the cement board will crack itself. Of course, after adding "muscles and bones", the strength of the cement board has also been greatly enhanced, and the performance is better.

The strength of straw reinforced concrete is limited, but it can help cement slabs resist cracking, but there is no doubt about it. This is especially important in winter, which can greatly improve the service life of cement slabs and save costs. Persist without cement board for decades, as long as you insist on it for several years without changing it, even if Marlin has achieved its goal. Moreover, the cement pavement is easier to repair, just change it.

As a result, Marin set the rule that 53mm thick ordinary thickness asbestos fiber cement slabs are used for main roads, while ordinary roads and city streets are generally made of 26mm thick straw reinforced concrete cement slabs with reduced thatched tendons.

After all, asbestos fibers are chemically stable, not easily corroded, and will not deteriorate. Although the cost of the cement slab used to make the main road is higher than that of the straw reinforced concrete cement slab, the main road is not much after all, and the amount used is limited. And straw reinforced concrete cement slabs, because thatch is not valuable, easy to collect, and low cost. Moreover, after halving the thickness, the manufacturing cost is further reduced, which is conducive to comprehensive promotion in China.

Subsequently, the newly built cement board factory in Beihai began the production of two specifications of cement board. The two cement slabs produced by it are given priority to the construction of roads within the Beihai Kingdom. But on the English side, roads will also be built. For example, the two fiefdoms of Northumberland and Isle of Wight definitely need to build roads. As for the border counties in the south of Scotland and the highlands in the north, Marin was in no hurry to build roads there. Because, most of the land is mountainous, and it is very difficult to build roads. Moreover, the mountainous area is prone to mudslides, which are easy to destroy cement pavement.

In County Wicklow, Ireland, where Adler is located, Marin gave priority to providing a batch of cement slabs to support the construction of two main roads for military use.

Although Wicklow County is on the east coast of Ireland, it still rains a lot more than the North Sea Country. Therefore, in Wicklow County, there is a greater need for concrete pavements that are not afraid of rainy days. Or rather, the whole island of Ireland is in great need of this kind of road. It's just that Marin can't produce at the moment, so he can only supply the needs of Wicklow County in Adler first. Moreover, it can only supply the amount of one or two roads.

In addition, Marin had to supply the needs of the New York side. Anything else can wait, a concrete paved road to the Great Lakes will not run. Marin is now counting on finding the location of the world's first modern oil well, Drake's Well in Titusville. Titusville, on the other hand, seems to be near Lake Erie, and there are oil seedlings on the surface.

Marin plans to start building the cement pavement from Philadelphia to the west now, without rushing, just starting to build it. Anyway, with the hollow steel drum roller and cement slab, the speed of road construction is called fast. The only trouble may be that you will be attacked along the way. After all, the Indians were not fools either, and they certainly understood that they would be in trouble after the road was repaired, and they would definitely block it.

However, Marin is now planning to get hundreds of thousands of laborers out of the island of Haiti, and he is not afraid. When the time comes, he plans to draw in tens of thousands of Taíno laborers from Haiti Island to build this road. Cut down trees first, then build roads. After determining the direction of the road, first cut down all the trees along the way, and then start laying the foundation to repair the road.

The standard for cutting down trees is that all trees are cut down within a distance of thirty or forty meters on both sides of the road. The native Indian earthen bow with rattan as a bowstring is not very powerful, and it has a range of thirty or forty meters. This distance was left empty, just to avoid them from putting cold arrows in the woods and affecting the construction.

And if they dare to come out of the woods, it will be a taste of the strength of the guards......

……

Once the stone road is repaired, Marin will build a post station every 20 kilometers. The post station can not only store horses for messengers, but also build walls and have military defense capabilities.

This was only the first step, and after that, Marin would send the peasants to the various stations. Then, starting from the post station, attack on both sides of the road, cut down trees, and clear farmland...... Eventually, a walled armed village was formed on the basis of the post station......

If the Indians violently resisted, they sent a large force along the stone road to clear the Indians around the station. Now, the colonial armies in North America have a wealth of experience in jungle warfare, and it may not be possible to conquer the entire east coast of North America, but the ability to fight a small tribe alone is more than enough.

Moreover, in the future, Marin will continue to select soldiers from German immigrants, form a 10,000-strong army in the North American colonies, learn jungle warfare skills from the more than 2,000 colonial veterans, and eventually further sweep the Indians in the jungle to seize more land.

The principle of road construction of cement pavement is not to seek a straight line distance. Except for the stone paved road that is in a hurry to find Testerville on the shores of Lake Erie, the other cement pavements will stretch along the Great River Plain as far as possible. The goal is to occupy as much good land as possible. After all, the plains by the great rivers must be fertile soil, and the most fertile.

As the great powers did in China at the end of the 19th century, the railroad was the sphere of influence. In the same way, the cement slab road is also the sphere of influence of the Beihai State. Even, further than spheres of influence. Because, Marin will directly send troops to control it, and even directly develop and use it.

……

After sorting out his thoughts, Marin quickly issued a series of orders to make specific arrangements for the construction and development of roads in the North Sea Kingdom, Britain's own territories, and the American colonies.

But just when he was tired of writing and wanted to move his wrist, Kohler suddenly hurried over and reported:

"Your Majesty, His Majesty Edward is assassinated!"

……