Everyone looked sorry, Su Cheng's face did not change, and he smiled slightly: "Of course you can't rely on bricks alone, isn't there still cement?" ”

Everyone's eyes turned to the cement pile next to them, with a strange expression, Li Shimin frowned and said, "Just rely on these ashes?" ”

When they came just now, they saw that the craftsmen were plastering the walls with this plaster, isn't this thing just mud? What does it do?

Su Cheng said with a smile: "This is called cement, mixed with sand and water and evenly, it will become extremely hard after drying, the city wall over there is almost dry, whether it will work or not, Your Majesty can give it a try!" ”

Seeing that Su Cheng still looked confident, Li Shimin was suspicious in his heart and led everyone to walk over there.

The wall is not very thick, everyone looked at it, and some people started to touch it, and it was really hard to touch, even if they couldn't pick it off with their fingers, it really didn't look like ordinary mud.

However, it is difficult to say whether it will work or not, after all, the enemy does not pick with his hands when fighting, and the city walls must withstand the test of bows and crossbows when fighting.

Wei Chigong scratched his head a little and said, "Why do I think this city wall can collapse with a hammer!" ”

Many generals nodded their heads, and they also felt this way, of course, because this wall was not too thick, and it looked similar to the courtyard wall at home.

As far as the courtyard wall of their house is concerned, they can definitely blast a crack open with a hammer!

Su Cheng said with a smile on his face: "I have heard for a long time that the Duke of Eguo is brave, and I want to open my eyes!" ”

Wei Chigong laughed and said: "It's just a wall, and a hammer will smash a big hole!" ”

Li Shimin smiled: "Then let Jingde try!" ”

"Great!" Wei Chi complied, then picked up a hammer on the ground, and strode to the wall to stand still.

Everyone dispersed very consciously, staring at Yu Chigong with blazing eyes, everyone still recognized Yu Chigong's brute strength, and they also felt that if this Wei Chigong hammered down, the wall was likely to collapse.

"I'm not going to keep my hand!" Wei Chigong glanced at Su Cheng, and then shouted.

Rumble!

Yu Chigong slammed his hammer against the wall.

And then.

The hammer was out of his hand, and Wei Chigong screamed.

Su Cheng couldn't help laughing, it was strange if he didn't be stunned by this hard hammer.

However, no one cared about Wei Chigong, who was jumping, and everyone's attention was focused on the wall.

The wall did not collapse as expected, and although it was not intact, it did only shed some skin.

Li Shimin and the ministers were all stunned, this result was too unexpected!

Li Shimin personally stepped forward and touched the place where it was bombarded by the hammer, and a look of surprise finally appeared on his face.

Cheng Yanjin laughed and said: "I'll just say, this city wall must be very strong!" ”

Everyone couldn't help but stare at him with contempt, you haven't farted a single one since you came here, okay?

Li Shimin finally had a trace of excitement in his heart, and said loudly: "Go to the bow and crossbow!" ”

The accompanying guards immediately set up their bows and crossbows, and with Li Shimin's order, the buzzing bows and crossbows rang out.

Eventually, the crossbow stopped, and although the wall was unrecognizable, it was not very traumatized.

After checking it, everyone had a smile of surprise on their faces.

"Haha......" Li Shimin laughed.

"Okay, good, Su Cheng, you're good!" Li Shimin praised excitedly.

Su Cheng said with a smile: "Your Majesty, the most important thing is that it is very quick and easy to repair with cement and bricks. ”

Li Shimin couldn't help but nod when he heard this, when they came just now, they had already seen the process of craftsmen building walls, which was indeed very simple.

Because the bricks are fixed in shape, and they do not have to be beaten like stones, it is very simple to build walls.

And, of course, most importantly, local materials!

There is no need to requisition the people, and there is no need to spend much money on food, just let the garrisons of the border towns repair it themselves.

For a while, Li Shimin's heart was very comfortable, and the problem was solved! Not only is it solved, but it can also save money and food, and there is no need to requisition people!

Tang Jian, the secretary of the Ministry of Works, praised: "An Kangbo is not only a great talent, but he is also so proficient in fortifications, which is really a blessing for my Tang Dynasty!" ”

Li Shimin asked with a smile: "Is it easy to fire red bricks and cement?" ”

Su Cheng smiled: "It's not difficult at all, these craftsmen can learn it as soon as they learn!" ”

In fact, after Li Shimin just finished asking, he felt that he was doing something superfluous, because it had only been more than ten days since the rule was treated, and the city wall had been built for such a long time, and Su Cheng was clearly sleeping just now.

Fang Xuanling, Li Jing and others were still sighing around the city wall, and at the same time they were constantly discussing, and they had the intention of repairing all the walls of the border towns.

Su Cheng coughed and said, "Your Majesty, in fact, the use of cement and bricks is not just to repair the city wall. ”

Li Shimin was a little surprised: "Oh? What else? ”

Everyone's eyes were all attracted by Su Cheng's words, the use of cement and slabs and bricks is not just to repair the city wall? What else?

Su Cheng smiled slightly: "For example, build a house!" ”

Building a house? Li Shimin Huo Ran turned his head to look at the other side of the wall, there were a few houses standing there, and everyone's attention was on the wall just now, but they didn't pay much attention.

"Let's go, let's see!" Li Shimin strode there with great interest, because after confirming that the wall was very strong, his mood was also relaxed.

Upon entering the house, everyone was a little shocked, although it was very simple, it could not be compared with their magnificent mansions, let alone the imposing palace, but this house looked very solid and spacious, very different from those low houses.

Su Cheng smiled: "This is a house built with cement and red bricks, which is far simpler than using wood and stones, and it is very strong, and more importantly, cement and red bricks are easier to obtain!" ”

Li Shimin praised with great satisfaction: "Yes, very good, so that the people of the world can live in it!" ”

The eldest grandson Wuji praised: "Thinking about it this way, the use of cement and red bricks is indeed too great, let alone repairing the city wall, even if it is not difficult to build a city!" ”

Su Cheng chuckled and said, "Their use is more than that!" ”

Li Shimin asked with a look of surprise: "Oh? What else can you do? ”

Su Cheng said with a smile: "There are many uses, for example, repairing river embankments, repairing bridges, and paving roads......"

Every time he heard Su Cheng say something, Li Shimin's face was a little more surprised, but he couldn't help but be surprised when he heard the end: "Pave the way? ”

Not only Li Shimin, but Fang Xuanling and others also showed puzzled looks on their faces.

Su Cheng nodded and said: "Yes, paving the road, Your Majesty also saw it, the cement is very strong after it dries, it can be used to pave the road, the road will become very smooth and very solid, even if it rains, it will not be muddy, this will greatly increase the speed of the carriage, just imagine, if a road is paved with cement between Luoyang and Chang'an, how much can the time from Chang'an to Luoyang be shortened?" ”