As soon as the father and son approached, Steward Hu and a eunuch from Ouchi jointly greeted them, and Li Kang hurriedly said, "Father-in-law Liu, Li is polite, 1"

Li Xiang raised his eyes and saw that the father-in-law Liu had a white and beardless face, and there seemed to be a smile on his face, thinking that the eunuchs seemed to be a little perverted, and he didn't know if this father-in-law Liu had a psychological problem?

However, seeing Li Xiang standing beside Li Kang, the face of Gonggong Liu changed, it turned out that he had seen Li Xiang dining at the same table with the emperor and the princess of the concubine, and knew that this young man was the person the emperor fancied, so he hurriedly made a big salute and said: "It turned out that Li Gongzi arrived, and our family is polite!" “

Li Xiang pointed to himself and said, "This father-in-law, do you know me?" ”

Gonggong Liu smiled and said, "Our family stood by the emperor's side last night, Li Gongzi probably didn't notice it, right?" ”

Li Xiang hurriedly said: "Ah, I see, I said that Grandpa Liu looks very familiar!" When I said that, I remembered. Pen, fun, pavilion www. biquge。 infoI didn't expect Gonggong Liu to be in charge of the biogas digester! ”

Gonggong Liu laughed and said: "We heard that this biogas tank is a magical thing designed by Li Gongzi, and the people in the palace are very curious, those fecal things can produce biogas, and can also be used to burn the fire for cooking, and even better, the biogas lamp designed by Li Gongzi, if there is this thing in the palace, it is really wonderful!" ”

Li Kang laughed and said: "Gonggong Liu, don't praise the dog anymore, if you praise him again, maybe he will go into the pit and be embarrassed!" Today, my father and son also came to take a look, the progress of the construction of the biogas digester seems to be quite smooth, and I think the rest of the month is enough! ”

Gonggong Liu smiled and said: "That's not it, the emperor attaches great importance to this biogas digester, so he sent our family to keep an eye on it!" The thought of using the clean biogas and bright biogas lamps in the future makes us excited! All of this is thanks to Mr. Li and Master Li! ”

After some polite words, Li Xiang followed his father down the pit and watched the craftsmen build the pool wall.

To say that the craftsmen of the Great Song Dynasty, the technology is really not bad, only with some backward means, can Li Xiang design the large fermentation tank to be wholeed, see them use lime mortar to build the pond wall, Li Xiang suddenly had an idea, it seems that the cementite material appeared in the world hundreds of years in advance.

In his previous life, Li Xiang studied inorganic non-metallic materials, and after graduation, he worked in a commercial concrete company, and he also has a special affection for cement, a building material. If cement is produced in the Southern Song Dynasty and widely used in construction, then the appearance of the entire Great Song Dynasty will change greatly! This is much more significant than the flush toilet, with cement and concrete, it is possible to build stronger walls and buildings, and of course, the most important thing is that after the large-scale production of cement, you can no longer use glutinous rice, a valuable grain, as a cementitious material!

However, although the cement clinker firing process is not complicated, the formula is also very simple, that is, ordinary limestone plus clay or red shale, sometimes add a small amount of iron correction material or silicon correction material, in a kiln of more than 1,300 degrees, you can fire clinker. Then use a mill to grind, grind the clinker into fine powder, of course, in the process of grinding, a small amount of gypsum will be added as needed to adjust the setting time, you can also add some admixtures such as volcanic ash or rice husk ash, so that the fine powder that is ground together is cement.

It's very simple to say, but this is in the Southern Song Dynasty, one has no heavy machinery, and the other has no electricity, how can this be achieved?

However, Li Xiang still remembers that as early as 1825, human beings used intermittent clay kilns to calcinate cement clinker, and perhaps now we can use that backward clay kiln, although the efficiency of firing cement clinker is lower, and the quality is relatively poor, but it is better than being able to produce it on a large scale.

As for grinding, you can also use water or wind power to drive the mill.

With cement, it's time to formulate concrete!

Concrete is indeed the largest building material, and it is used in large quantities in almost all projects.

Li Xiang even thought of what a novelty it would be to build a concrete batching plant in Lin'an City, Kyoto, in the Great Song Dynasty! I'm afraid Lin'an City will change at that time!

Li Xiang still remembers that the concrete company he worked for before crossing was built on the side of the Fuxi River, which is a feature of the concrete batching plant in Yandu, and almost all concrete batching plants will be built by the river. This is because several of the raw materials used to mix concrete can be pulled by boat to the wharf of the mixing plant, river sand and gravel are transported to the sand and gravel yard by grab and belt conveyor, and cement is transported by high-pressure air through pipelines to the cement storage tanks erected high.

And this Lin'an City, of course, also has a river, and you can also use a boat to transport all those sand, gravel and cement to the flange mixing plant, but at this time, to build a concrete mixing plant, I am afraid it is more difficult than repairing a cement plant! After all, there is no industrial base, there is no way to manufacture those equipment, of course, Li Xiang can use a super 3D printer to print a set of equipment, but Li Xiang doesn't want to do this, it's too wasteful of materials, in case the super 3D printer runs out of printing materials, it will not be good.

Of course, there is another eye-catching thing in the concrete batching plant, that is, the concrete mixer truck running all over the street, commonly known as the tanker! Carrying a big jar like a rugby ball on the chassis of a truck, and the big jar spinning non-stop, people at the time saw this kind of car and 99 percent didn't know what it was used for. In order to prevent the phenomenon of delamination in the process of transportation, it is necessary to let the big tank rotate all the time, and there is a circle of mixing blades on the inner wall of the big tank, which can ensure that the concrete comes out of the mixing plant and is always in a relatively uniform state on the construction site.

However, in ancient times, it was impossible to use concrete mixer trucks to transport concrete, at most it was to get a few manpower carts, and then use tower cranes to lift the concrete to the construction site.

Seeing Li Xiang standing there and smirking, Li Kang wondered in his heart, could it be that his son was stupid again, this shouldn't be! Isn't he completely well?

So Li Kang pushed his son, Li Xiang was startled, came back to his senses, and said excitedly: "Father, the child has thought of a new invention!" With that kind of material, no matter what building we build, we can do without glutinous rice juice! ”

Li Kang touched his son's forehead and said suspiciously, "Xiang'er, you don't have a fever, right?" If you don't use this glutinous rice juice, what do you use? ”

Li Xiang said: "Father, I'm not confused!" I'm talking about this kind of thing, it's called cement! It is similar to the raw materials of our official kiln firing ceramics, but the formula and firing temperature are different, this kind of thing is finally ground into powder, as long as water is added, it can be used for masonry, and sand and gravel can also be added, becoming a better material than Sanhe soil! ”