A complete cement slab is in front of Li Er, this is a cement slab with a length of one meter and a width of about sixty centimeters, according to the measurement unit of this era, Lu Hanyang does not know, but this is indeed a very good cement slab.

Not only this one, but also two other pieces remain intact, that is to say, three pieces are formed, which makes Li Er and Du Ruhui see the possibility of success.

"Come on, try the hardness of these three cement slabs." Lu Hanyang glanced at it, and then decided to smash it and try it.

"Yes, you have to try, this thing looks like a stone, but if it shatters when you knock it, I'm afraid it won't work." Li Er also agreed.

So the two Xuanjia guards took the flail from themselves, which was a weapon similar to a meteor hammer. It has a short handle, and then a chain of both handles and hammers. This thing belongs to a close-quarters weapon, which is relatively unpopular, of course, as a Tang general, everyone will make it.

"Who wants to give it a try? Ladies and gentlemen. Li Er took the flail and was eager to try, but he still asked his courtiers, who would like to come, it is better to be happy alone than to be happy with everyone.

"Your Majesty, it is still the most accurate test by Your Majesty himself!" Who wants to be this budding bird on the spot? And it's still a job of killing force, and it's no good to smash it, right?

"Well, I'll give it a try!" Li Er put the flail up, and the hammer head of a meteor hammer flew directly in the body and around it, this is the first year of Zhenguan, Li Er has not yet grown fat, and this flail is a tiger and a tiger.

"Open...... Hum! A hammer smashed down, and suddenly a pit was smashed directly on the cement slab in front of him.

"This is not good, it is soft, it should be more clay." Lu Hanyang shook his head.

"Go on!" He commanded Li Er, so Li Er continued to dance and smash stones.

The second piece of "bang ......" smashed down at once, directly smashing the flail and flying, splashing out a spark. And there is only one white mark on the cement slab.

"This is good, remember the recipe ratio, if there is no better one, burn it according to this." Lu Hanyang came to a conclusion, after all, it can't be said that Li Er didn't work hard, didn't you see Mars come out. This can only say that the hardness of this cement slab has been qualified.

"One more piece!" Lu Hanyang continued to let Li Er play his labor, and Li Er only found out at this time that he had found a job as a coolie, and directly glared at the official who flattered him just now, regardless of how he felt that the other party had eyes just now.

"Hmph......" sold enough strength, Li Er directly smashed down with a flail, and the third cement slab directly shattered a large piece, and there were cracks that spread far away.

"It's hard enough, but it's not tough, it's a bit brittle. Limestone can be a little less. Lu Hanyang once again made a summary, not that Li Er was strong, because there was still a verification process next.

"Come on, lift these three cement slabs, and then don't use force, just let go and smash them on the ground!" Lv Hanyang experiments with the toughness of cement slabs.

"No!" Immediately, a soldier came to lift the cement slab, in groups of two, and lifted the cement slab to the height of his thigh, about a meter or so, and then let it go directly.

Suddenly, the three cement slabs all fell to the ground, and it was immediately clear which was better and which was inferior: the first one was deformed and a little soft. The second piece was still the same, but the third piece was directly broken into several pieces, and it was even more broken along the crack that Li Er had knocked just now.

"The second piece is qualified, and the rest are not!" Lu Hanyang came to a conclusion: "The emperor can go back and make subtle adjustments to the formula of this cement slab, and then see if there can be a better one, this cement is of great use, paving roads and bridges, building houses and repairing houses." Lu Hanyang said.

"That's natural, after I go back, I will burn the cement first according to this recipe, and as for the formula adjustment, I will use a small cave to specialize." Li Er was overjoyed, if this thing paved the road of the Tang Dynasty, then the army would definitely move much faster, supplemented by horseshoes, and the original one-month march distance could now be shortened by half.

"Okay, now that the cement has been verified, the formula is five to one best. Then it's time to take out the gunpowder you brought. Lu Hanyang said to Li Er.

"Immortal Chief, please...... Although this gunpowder Xiaoke has been developed, how to use it requires the guidance of the immortal chief. Since the moment Li Er knelt down in front of Lu Hanyang, he was even more shameless towards Lu Hanyang, and directly begged for advice.

"This thing is very dangerous, you actually dare to bring hundreds of civil and military officials with you, and you are really ignorant and fearless." Lu Hanyang didn't know whether to praise Li Er or scold him. This gunpowder is just a rough recipe given by Lu Hanyang, Li Er and they made it up by themselves, and they don't know if the nature is stable and unstable, if it is unstable, it will explode, and it will definitely be able to bring the high-level of Datang to a pot.

"Immortal Chief, so dangerous?" Li Er asked.

"Of course, why do you think this seat showed you the burst sigil of this seat at that time? That burst sigil is much less powerful than the gunpowder of your car! Lu Hanyang said.

The explosion of the burst talisman covers a radius of about three zhang, and the explosion of gunpowder in this carriage can definitely cover a radius of 100 meters.

"This ......" Li Er broke out in a cold sweat, he had seen the power of the bursting talisman at that time, and today he came to ask for advice on the use of gunpowder, but it turned out to be such a scene, fortunately nothing happened.

"Okay, I'm here, I'm fine now." Lu Hanyang had already isolated the gunpowder in the two carriages, and let Xuanjiawei take it halfway up the mountain.

"Now, test it, you're two compatible there, right? Try both, wrap it in cowhide, and tie it firmly. Leave at least three feet of lead. Lu Hanyang commanded.

"Do what the fairy chief said, remember that you must do it well, and write down which recipe it is, whether it is formula one or formula two." Li Er was afraid that if he said to write the formula, these big-headed soldiers would write all the real formulas.

"Alright...... Please Your Majesty~! After a while, two huge explosive bags were brought to Li Er. At this time, they were all carried by two soldiers, after all, all the explosives in their carriage were wrapped in these two cowhide explosive bags.

"The experiment can't be here, let's go to the edge of the cliff!" Lu Hanyang said. Experimenting with explosives packs in the main hall of the Eight Views Palace will definitely lift the entire Eight Views Palace into the sky.

The group headed towards the cliff behind them, and from the outside, the apse of the Hakkeigu Palace is generally not open to the public.