Chapter 318: Trial repairing cement road

Since the completion of the high-level reservoir, the cement produced on Baltrum Island has been somewhat backlogged. Update quickly without ads. However, Marin did not order the cement plant to cut output. Because, in any case, cement is a very useful strategic material.

After the high-level reservoir was built, Marin ordered to start adding a layer of reinforced concrete outside the city wall of Aurich to enhance its resistance to impact.

However, this matter is not in a hurry. The main reason is that land heavy artillery has not been popular in other countries. Therefore, Aurich was not worried about the wall being bombarded by heavy artillery.

In fact, it is not that other countries do not have heavy artillery casting technology. It is because the speed at which heavy artillery consumes gunpowder is too scary, and the average country cannot afford it. Moreover, the amount of copper needed to cast heavy artillery is also scary. Therefore, few countries in Europe play heavy artillery, nor did they develop that technology. Even France, the largest European artillery power on the bright side, began to develop a 12-pound bronze gun after seeing the power of heavy artillery to bombard the city gate. On the Marin side, cast iron heavy artillery has been widely used. But Marin had too many eyes, and all the cast iron cannons exposed to the outside were coated with a layer of copper paint, which made people mistakenly believe that Marin had so many copper cannons.

In addition, because of the urgent need to provide a batch of chest plate armor and helmets to the Principality of Geddes, the steel mill also does not have so many steel bars to supply the reinforced concrete wall. Therefore, within a short period of time, the project of adding a layer of reinforced concrete outside the city was suspended.

However, Marin was reluctant to let thousands of construction workers do nothing. After all, this is a waste of labor. So Marin decided to find something else to do for them.

What exactly do you do? After thinking about it, Marin finally decided to lay a cement road first ...

Anyway, ordinary cement roads are laid, and no steel bars are needed. Also, don't be too cool when walking on the cement road. On a flat road, the carriage can walk up and run out of the speed of the tractor. Even, there is a feeling of not stopping at all.

The most important thing is that even on rainy days, the cement road is very cool to walk, without affecting the speed.

The Roman Boulevard is paved with flagstones and stones. However, when driving on a rainy day, if a heavy carriage passes, the stone slab is easily pressed up and the road surface is deformed. Moreover, the Roman Boulevard is far less smooth than the cement road.

The carriage was bumpy on the slate road of Roman Boulevard. While walking on the cement road, there is basically no bumps. Therefore, the concrete road is obviously superior to the stone road of the Roman Boulevard.

Moreover, in terms of cost, cement roads are also lower than stone roads. After all, the stone slab road requires workers to mine the stone, and then the stonemason polishes it into stone slabs, which is very labor-intensive.

The cement is fired with limestone and clay, and the cost is naturally not high.

Moreover, what Marin wants to lay is not a national road or a provincial road, but only a general rural cement road. It is the most common rural cement road of 3.5 meters wide and 20 centimeters thick.

This kind of cement road is everywhere in Marin's old home. As long as it does n’t take a dozen-tonne truck on a rainy day, it wo n’t be crushed.

Because, when it rains, the roadbed of the cement road will become soft. At this time, if an overweight truck such as the Yellow River heavy truck with a weight of more than a dozen tons, it is easy to crush the cement road.

However, in this era, the weight of the carriage is the heaviest, and the load is only 1.5 tons. There is absolutely no ability to crush the rural cement road. Even a few tons of carriages can't crush rural cement roads.

Of course, Marin did not intend to promote cement roads in Europe. His real purpose was to build a concrete road across the isthmus in Panama.

After all, the Panama Isthmus borders the Caribbean Sea to the north and the Pacific Ocean to the south, with heavy rainfall. If the goods transported from Peru or Daming pass through the isthmus, once it rains, the dirt road cannot go. In particular, it is going to rain, and it must be a heavy rain. The carriage was completely unable to walk on the dirt road.

Therefore, it is very important to build a concrete road that is not afraid of rain. By that time, Peru ’s gold and silver, Ming Dynasty silk and porcelain can be transported to Cologne on the Caribbean coast through this cement road, and then shipped back to Europe. Especially porcelain, the most unbearable. If you are walking on a bad road, the porcelain is easily broken. However, if the carriage is not bumpy when walking on a cement road, the porcelain is naturally not easily damaged.

Now, Marin asked the workers to build a cement road first, which is actually an attempt. Accumulate technology first, and wait until Gorard stands firm in Panama, cut trees and cut a road, and the cement road can be built on horses.

With this cement road, the horse-drawn carriage on the cement road will be effortless and flat. At that time, the wagon with a 65-kilometer wide isthmus ran, and it could be finished in a day. In this way, you don't have to stop in the tropical rainforest of Panama at midnight and be bitten by poisonous insects and mosquitoes. You know, it is very fatal.

The laying stage of the paving cement road is very simple, that is, bricks are now standing on both sides of the road as a block. Then, pour the mixed cement in, smooth it out, and then use the wooden board to compress it firmly.

But it is a little trouble to lay the foundation. You should know that the quality of a road is the foundation, besides the materials. If the roadbed is not strong, the road surface is prone to problems.

The problem is that there are no road rollers now, so Marin decided to let the workers ram the pavement with a hammer. Then, use the cow to pull the stone chime and roll it several times.

Because the Panama area is a tropical rainforest, ordinary dirt roadbeds cannot be used. Otherwise, if the accumulated water soaks, it will be soft.

Therefore, Marin decided to use a lot of stones and lime in the roadbed, mix the soil, stones and lime, tamped it with a hammer, and then roll it with beef pull stone a few times.

Wait until the roadbed is solid, and then start to stand up the bricks on the edge and pour cement on it. Then it was smoothed out manually and pressed firmly with a wooden board.

In addition, drainage ditches need to be dug on both sides of the roadbed. Once it rains, it is guaranteed that no water will accumulate on both sides of the roadbed, so that the roadbed will not be damaged.

Therefore, building a cement road is not simple. In particular, there are many issues to consider when building cement roads in a rainy area.

Marin's plan ~ www.wuxiaspot.com ~ is to build a rural cement road about 3 kilometers long from the north gate to the horse farm in the north of Aurich city. Dirt roadbed, plus drainage ditches.

This time the road was built mainly by trial and error. After all, Marin is not an expert in road construction. These experiences were also heard in the past, and have not been personally verified. This time, he intends to accumulate experience and select powerful craftsmen through this road repair. Then, send those skilled craftsmen to Panama to supervise and guide the black slaves to repair the cement road.

As for the cement used for road construction, Marin decided to still use fly ash cement. Because fly ash cement has low dry shrinkage, high tensile strength, good crack resistance and other advantages, it is also resistant to corrosion. It is definitely more suitable for building cement roads than ordinary grade cement. Moreover, because there is a large amount of fly ash in the salt cooking base, which is directly supplied to the cement plant, Marin is not short of fly ash cement. Even building a 65-kilometer cement road is enough.

Once the cement road of the Isthmus of Panama is built, by then, the Isthmus of Panama will become a place with convenient transportation, quickly connecting the Pacific Ocean and the Caribbean Sea, and becoming the main transportation point of the Americas ...

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