Well, it's going to occupy the pit again, it's a little too late to write, change it back in 15 minutes, please refresh it then, thank you......

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In fact, the so-called cement pavement was also very popular in later generations, and many squares also used this kind of pavement. Of course, that's a low-end square. High-end squares, either with marble slabs paved with floors. Or, with tiles. Only those with a small investment budget will use cement slabs to pave the pavement.

Because, the strength of the cement slab is not high, unless it is a reinforced concrete cement slab. Ordinary cement slabs are not as strong as slates. Moreover, the aesthetics are also poor. After all, everyone knows what cement looks like, gray and unclassy.

Therefore, many pedestrian street squares are directly laid with tiles on the road surface, which looks very eye-catching. But to be honest, the tiles are so thin, and the strength is not as good as the cement board. When encountering a heavy truck, it is ironclad. It is only in the pedestrian plaza that this thing will be paved.

And the cement slab, the appearance is much worse than the tile. But the practicality, on the contrary, is a little stronger. At least, it can bear a carriage or something, even if it is a horse-loaded carriage.

In addition, the pavement paved with cement slabs is also convenient for maintenance and replacement. Which cement slab is crushed, pry it up and replace it with a new one......

Because it is so convenient to pave the road, Marin has now abandoned the original plan to promote cement roads and promoted cement pavements instead. Especially in the streets of the city, laying cement slabs is quick and easy, and the effect is also very good. At least, no worse than the previous stone and cobblestone pavement.

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

Previously, Marin had been reluctant to help other countries build concrete roads. Because of the special nature of cement, when used and mixed, it will definitely arouse strong interest in other countries, and it is easy to attract thieves.

But selling cement slabs is different, and cement slabs Marin can falsely claim to be an inferior slate. The price can be a little lower than the authentic slate, even half of it is very profitable.

That is to say, from now on, the North Sea country will have a new exportable commodity - pavement cement board!

This kind of square cement slab, which is about the same thickness as a brick but has a side length of 24 cm, is very convenient for paving. As long as the roadbed is tamped and the road surface is leveled, the wet clay (as a binder) can be laid directly on the roadbed.

This is much simpler than making a cement road, a construction worker can lay dozens of cement slabs in a while, and a long road surface can be laid in a day. As long as the clay used as a binder dries out, the pavement is ready to use.

As for the roadbed, it is a mixture of lime and sand, which was very popular in Europe during the Roman Empire. This kind of roadbed water does not run badly, and both Eastern and Western civilizations like to use it.

Of course, the cement slab road in Beihai is definitely different from the cement slab road abroad. The difference lies in the adhesive ......

In general, clay mud must be used as a binder between cement slabs and bricks. Normally, there is no problem, but if you soak in water during the rainy season, the mud will definitely soften, causing some loosening of the road surface. Over time, there will be some problems with the road surface and need to be repaired.

The cement pavement laid by Beihai in China is directly used as a binder. Cement and cement slab bricks are the same substance, and they are not afraid of water after drying. In this way, the quality of the local cement slab road in Beihai country, which uses cement as the adhesive for the gaps of cement slabs and bricks, is definitely better than that of foreign countries.

But then again, even if mud is used as a binder abroad, the quality of the pavement is definitely much better than that of dirt roads and gravel roads. Therefore, in the future, cement slabs and bricks will not be sold.

But first, Marin had to make a model so that everyone could see the benefits. In this way, there will be customers who come to order cement slab bricks.

As a result, paving concrete pavements in the Dutch towns that are not near the sea and rivers has become a top priority.

It just so happened that the engineering unit formed by Marin was currently idle because there was no war. Therefore, Marin planned to send an engineering unit to the Netherlands to help build a cement pavement to play an exemplary role.

Of course, it's already the beginning of September, and the autumn harvest is about to begin. Marin plans to wait for the autumn harvest to send engineering troops to the Netherlands to help pave the cement pavement.

At present, the total number of engineering troops in the Beihai State has reached a huge scale of 5,000 people. Their main task was to build bridges and roads to open the way for the army. Of course, there were also important tasks for the construction of military fortresses.

Each of them was trained in the mason's trade, the bridge erection, and the building of bunkers. This kind of thing of laying cement pavement, here for the engineers, is just a very low-end job, very simple, and there will be no problems.

Moreover, in order to facilitate their work, Marin also helped them "design" (copy) labor protection gloves for work, and iron hard hats (there is really no high-strength plastic). In addition, there are tilting dump trolleys for transporting bricks for easy dumping. This trolley with tipping bucket can dump lime and sediment, which is very helpful for engineering construction. Unlike ordinary cars (including wheelbarrows), it is inconvenient to dump and can only be unloaded manually, which is more troublesome and laborious.

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In addition to these common construction equipment in later generations, Marin also made innovations in the compaction and rolling of roadbed......

Later generations know that when building roads, it is necessary to have a roller to compact the base layer of the road. In order to achieve the purpose of compaction of the road surface, the wheels of the roller will often be steel rollers weighing several tons or even more than ten tons.

However, in this era, it is difficult to make such a heavy grinding wheel. It's not that it can't be made, but it's made and can't be pulled. After all, even the strongest Sharma pulls up to 5 tons of cargo. Moreover, it is the result of the application of low-resistance bearings.

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

Similarly, it is difficult for animals to pull heavy rollers on the road. To achieve this, Marin uses several cows pulled together.

But the biggest problem is not that cattle and horses can pull multiple rollers, but that they can transport heavy rollers!

If it is a stone weighing several hundred catties, the transportation is simple, and a few people can directly carry it to the carriage. This is the case with the current artillery in Europe, a three-pounder gun weighs 300 pounds, is easy to carry on a carriage and can be transported on long marches.

However, the rollers used for road rolling have to weigh at least two tons, or even several tons. Otherwise, the effect of tamping the roadbed cannot be achieved.

But the problem is that the grinding wheels weighing several tons are actually easy to build, but they are difficult to transport to the construction site......

If it is a construction area near the sea and river, it is also possible to use a boat with movable pulleys and levers to transport several tons of grinding wheels to the construction area. But if it's inland...... It's hard to get in, especially in the mountains......