In fact, the so-called cement slab roads were also very popular in later generations, and many squares also used this kind of pavement. Of course, it is low-end squares and high-end squares, either use marble slabs to lay the floor or ceramic tiles. Only those with low investment budgets will use cement slabs to lay the pavement.

Because the strength of cement slabs is not high unless it is reinforced concrete cement slabs. Ordinary cement slabs have a less strength than stone slabs. Moreover, the aesthetic level is also poor. After all, everyone knows what cement looks like, it is gray and looks ungrade.

Therefore, many pedestrian street squares lay tiles directly on the road surface, which looks very eye-catching. But to be honest, the tiles are so thin and the strength is not as strong as cement boards. When encountering heavy trucks, they will definitely be done. Only pedestrian squares can lay this thing.

The appearance of cement boards is much worse than that of ceramic tiles. However, their practicality is a bit stronger. At least, it is no problem to bear carriages, even heavy carriages.

In addition, the road surface laid by cement boards is also easy to repair and replace. Which cement board is crushed? If you pry it up and replace it with a new one...

Because it is so convenient to pave the road, Malin has now given up the original plan to promote cement roads and instead promote cement slab roads. Especially in the streets in the city, laying cement slabs is quick and convenient, and the effect is also very good. At least, it is not worse than the previous stone slab roads and cobblestone roads.

But the most important point is that Marin can sell cement boards to other countries!

Before, Malin was reluctant to help other countries build cement roads. Because the special nature of cement will definitely arouse strong interest from other countries when used and stirred, and will easily attract thieves to be concerned about it.

But selling cement slabs is different. Cement slabs Marin can liar to be a kind of inferior stone slab. The price can be a little lower than that of authentic stone slabs, even half the lower is very profitable.

In other words, from then on, Beihai will have a new exportable commodity - pavement cement slab!

This square cement board with a thickness of about bricks but a 24 cm long side is very convenient to pave the road. As long as the roadbed is tamped and the road surface is flat, you can directly lay the wet clay (as a binder) on the roadbed.

This is much simpler than building cement roads. A construction worker can lay dozens of cement boards in a short time, and can lay a long road surface in a day. As long as the clay used as adhesive is dry, the road surface can be put into use.

As for roadbeds, they use the roadbed mixed with lime and sand that was very popular during the Roman Empire in Europe. This kind of roadbed water cannot be broken, and both Eastern and Western civilizations like to use it.

Of course, the cement slab roads in Beihai are definitely different from those in foreign cement slab roads. The difference lies in the adhesive...

In general, clay mud must be used as the adhesive between cement tiles. There is no problem in normal times, but if water is soaked in the rainy season, the mud will definitely soften, causing some looseness in the road surface. Over time, some problems will occur on the road surface and need to be repaired.

For the cement slab roads that are laid in Beihai, cement is used as the adhesive. Cement and cement slab bricks are the same substance, and they are not afraid of water after they are dry and hard. In this way, the quality of the local cement slab roads in Beihai, which use cement as the adhesive for the gaps in cement slab bricks, must be better than that in foreign countries.

But then again, even if mud is used as adhesive abroad, the pavement quality will definitely be much better than dirt and gravel roads. Therefore, cement tiles will definitely not worry about sales in the future.

But first of all, Marin must make a model to let everyone see the benefits. Only in this way will customers come to order cement tiles.

In this way, helping the Netherlands pave cement slab roads without the seaside and riverside towns became the top priority.

Just so happens that the engineering corps formed by Marin is currently idle because there is no war and there is nothing to do. Therefore, Marin plans to send the engineering corps to the Netherlands to help build the cement board road, which plays a demonstration role.

Of course, it is already early September, and the autumn harvest is about to be around. Marin plans to send an engineering force to the Netherlands to help lay the cement slab road after the autumn harvest.

At present, the total number of engineered troops in Beihai Kingdom has reached a huge scale of 5,000. Their main task is to build complex bridges and roads and make way for the army. Of course, there are also important tasks responsible for building military fortresses.

Each of them has basically received training in masonry craftsmanship, bridge erection craftsmanship, and knows how to build bunkers and lay cement slab roads. For engineers, it is just a very low-end job, very simple and no problems will occur.

Moreover, in order to facilitate their work, Malin also helped them "design" (plagiarize) the labor protection gloves used for work and iron safety helmets (no high-strength plastic really). In addition, there is a tilt dump truck that is easy to dump for transporting bricks. This kind of trolley with a dump truck that can dump lime and mud is very helpful for engineering construction. Unlike ordinary cars (including wheelbarrows), it is not convenient to dump and can only be unloaded manually, which is more troublesome and laborious.

...

In addition to these common construction equipment in later generations, Malin also made innovations in roadbed compaction and crushing...

People in later generations know that when building roads, a road roller is needed to compact the road base layer. In order to achieve the purpose of compacting the road surface, the wheels of the road roller will often be steel milling wheels weighing several tons or even dozens of tons.

However, in this era, it is difficult to make such heavy wheels. It is not that they cannot be made, but that they cannot be pulled. After all, even the strongest Sharma can pull up to 5 tons of goods. Moreover, it is the result of low resistance bearings.

If you don’t use ball bearings to reduce resistance, it is estimated that Sharma can pull two or three tons of goods to the top.

Similarly, it is difficult for animals to pull the heavy rollers for road rollers. To achieve this goal, Marin used the method of pulling several cows together.

But the biggest problem is actually not how heavy the wheels can be pulled by cows and horses, but the transportation of heavy wheels!

If it is a stone carp weighing hundreds of pounds, transportation is simple, and just carry a few people to the carriage. This is the current cannon in Europe. The three-pound cannon weighs 300 pounds, which is easy to carry on the carriage and transport it away, and can marches for a long distance.

However, the rollers used for road rolling weigh at least two tons or even several tons. Otherwise, the effect of compacting the roadbed will not be achieved.

But the problem is that the milling wheel weighing several tons is actually easy to build, but it is difficult to transport it to the construction site...

If it is a construction area that is close to the sea and river, it can also use ships to cooperate with moving pulleys and levers to transport several tons of milling wheels to the construction area. But if it is in inland areas... it will be difficult to transport it in, especially in mountainous areas, which is simply impossible to transport it...

Nowadays, there are no heavy construction machinery, and it is simply a waste of life to transport a few tons of mills to areas with inconvenient transportation. Therefore, even the largest caliber infantry cannons made by the Beihai Kingdom generally weigh at most one or two tons. This is because the Beihai Kingdom has cage ball ball bearings, if it is other countries, it is difficult to transport a ton of infantry cannons.

What to do? The gravity of a few tons cannot meet the requirements of consolidating the roadbed...

Finally, Marin found inspiration when he saw Robert, the naughty boy, kicking a glass bottle filled with half a bottle of water...

Yes, the empty bottle is not heavy, but it becomes much heavier after filling the water. What if you use a hollow steel barrel...

So, Marin designed a huge hollow steel barrel. The steel barrel itself is less than a ton, but after filling it with water, the total weight reaches as much as 5 tons. It is definitely enough to use it to roll the road!

When transporting the wheel, if the water is removed, this hollow steel barrel will become an empty barrel weighing less than one ton. In addition, it uses a ball bearing with a cage, which is very convenient to pull it on with a horse. Or, by setting a springboard slope, you can roll the hollow steel barrel onto a special wide-body carriage compartment, which is very convenient.
Chapter completed!