The eldest brother talked about the hammer, "hey", and smashed it down with all his strength. The slate remained unmoved, except for a splash of debris.

"Hey, this slate is a little worse than the bluestone slab, Lao Jiu, is this really what you made of river sand, mud, gravel and water?"

Brother Jiu nodded proudly: "It is indeed made of river sand, mud, gravel and water. ”

Kangxi stepped down from the throne, touched the cement slate with his own hands, and nodded: "Well, it's really hard." ”

The third elder brother pursed his lips and muttered, "What's the use of just being hard, it's not like a stone." ”

"The third brother's words are wrong."

It was the fourth elder brother who spoke, he stared at the ninth elder brother and the cement slate with burning eyes, and said excitedly: "Ninth brother, is this cement slate easy to produce?" Is it possible to produce in large quantities? ”

"Oh? What does the fourth think? ”

The fourth elder brother said excitedly: "Khan Ama, bluestone slabs are paved everywhere in the city, whether it is horses, carriages or pedestrians, they will feel much easier." Outside the city, however, there are still mainly dirt roads, which are official roads, and they are not easy to walk. ”

"Bluestone slabs are difficult to mine, and they need to be polished, and transportation is also a big problem, and it is impossible to pave all the roads in the world with bluestone slabs. If this cement slate can be mass-produced, the problem can be solved! ”

"Khan Amma, think about it, if all the official roads were paved with this kind of cement and stone slabs, how much would the speed of the carriage increase? Local taxes can be handed over to the national treasury more quickly, and losses can be reduced. The speed of material circulation across the country will definitely be greatly improved, and it is not as easy as it is now to stock up on goods! ”

The fourth elder brother is on an errand in the household department, and the first thing that comes to mind is something related to the household department.

Brother Jiu looked at the fourth elder brother with surprise and admiration, and said, "Fourth brother, how do you know that this cement is the most suitable for road construction?" The production of cement is still relatively easy, and there is not much difference from porcelain, but the materials and proportions required are different. ”

"The burned thing is in powder form, which can completely transport the cement powder to various places, take river sand and clay locally, mix it on the spot, spread it evenly on the ground, and let it dry for a few days, it will be hard and flat like this stone slab."

"Khan Amma, Erchen also brought some cement samples over, do you want to test them on the spot?"

Kangxi was very interested: "Then give it a try, I want to see how this trick changes." ”

Kangxi took the lead out of the hall, pointed to a place and said, "Just do it here." ”

As soon as Brother Jiu beckoned, a few minions resisted a few bales of cement, river sand, gravel and clay, stirred a few things together, mixed them with water to form a viscous shape, and then spread them evenly on the ground and rolled them flat with wooden sticks.

The whole process didn't take long, Brother Jiu said: "When this cement slate is just done, it is relatively soft and cannot be touched, and it will become hard after drying for a few days." ”

The third elder brother muttered: "I always feel that it can't be true, how can this slimy and soft thing become hard when you put it down?" ”

Brother Jiu raised his eyebrows: "The third brother can wait and see, it's just a matter of waiting for a few days." ”

The crown prince said with a smile: "If this cement can really become so hard as the ninth brother said, then the official roads in the world can be better, and the decree of Khan Ama can be conveyed to the local government more quickly." ”

The eldest brother's eyes flashed: "Not only that, Khan Amma, if there is a rebellion anywhere, the army can also arrive faster!" ”