Brother Tang on the roof of the "public bathhouse" was pointing fingers, and he was very envious and told Li Renjun that downstairs, the chief wanted to teach Niu Dali how to paste tiles, and how beautiful those tiles were.

Downstairs, Niu Dali had already cleaned the walls of the "public bathhouse", and asked Huang Shi, "Chief, what are you going to do next?" ”

Huang Shi pointed to a wall and said, "Next, it's going to be wet, you fill this cement wall with a bucket of water and splash it on me, and it will be wet." ”

The "public bathhouse" is a strange building, its shell is a prefabricated house, but there are brick walls built around it, but the walls are not high, only two meters high, only half the height of the prefabricated house, and then the floor and walls are smoothed with cement.

What's even more strange is that there is a big walkway between the brick wall and the board wall, the walkway is two people wide, and then there are neatly arranged holes on the wall, at first they don't know what the road is for, and so the chief conjures up a lot of PVC short pipes, only to know that the road is originally to fix these PVC short pipes here, and then install the faucet that can adjust the water temperature on it, and the back walkway is used to walk the water pipe.

In the previous stage, the chief also asked them to use chisels and hammers to chisel on the smooth and flat cement wall, requiring the wall to be chiseled, the depth of the chisel should be 5 to 10 mm, and the spacing of the chisel marks was about 30 mm.

After they had done these things, the chief instructed them to shovel off the ash and dirt on the walls one by one, and let them sweep the walls with small brooms, and now that they had done so, and then let them splash water on them, they should be ready to start putting tiles.

Before the water on their side was splashed, they saw Jiang Laogan running in from outside and said to the chief, "Chief, the cement has been stirred, and we have already soaked those tiles, what are we going to do next." ”

Niu Dali was a little depressed when he saw Jiang Laogan's neat clothes, because the chief arranged light work for them, and the things on his side were some difficult things, when the wall was chiseled, the ash was splashed everywhere, fortunately, everyone also brought a big mask, but there was no way on the head and face, and now it was a gray face.

……

Although Jiang Laogan is already a veteran in Huangshi's opinion, after all, this is the first time to paste tiles, and Huangshi still has to check everything in detail, so he glanced at Niu Dali, who was doing things, and found that there was no deviation and walked out.

Several of Jiang Laogan's subordinates stood next to the cement mortar that had been stirred, waiting for the chief to come and inspect it.

Huang Shi walked in front of the cement mortar, inserted it with his hand, took out a handful, and rubbed it with his fingers, this kind of "325 cement" is indeed very different from the feeling of "Portland cement", not to mention that the cement mortar is still used in the sediment.

"325 cement" is just a popular term in the market, which generally refers to a strength grade of 32. Grade 5 cement does not refer to a specific cement species. The 28d compressive strength of "325 cement" is not less than 32. 5MPa。 The R in the cement logo means early strength, such as P. O32。 5R, which means that the intensity level is 32. 5 early strength ordinary Portland cement, now "325 cement" refers to PC32. 5 cement series.

It's just that now the ordinary cement strength grade has been canceled 32. 5 and 32. 5R。 Therefore, the only "325 cement" that can be bought on the market now is slag Portland cement, pozzolana Portland cement, fly ash Portland cement, and composite Portland cement. And the "Portland cement" and "ordinary Portland cement" that are early and fast and hard are no longer No. 325.

However, when Huangshi was decorating his own house before, he heard Jiang Hualong say that if there are no special requirements in the home decoration, the cement is generally "No. 325 cement", and the quality of cement within one month of leaving the factory can be guaranteed. Therefore, he asked Li Yifei to go to the market to buy a batch of "325 cement" from a small manufacturer and send it to the shipyard.

At the same time, there were also bags of sediment, which is actually fine sand. There is a difference in the selection of sand in decoration, and the wall tiles should be made of sediment, so although the appearance of the sediment is very unsightly, it can only be used for wall tiles. And when the powder wall, the wall is built, and the sand is used when sealing various grooves. And if you lay floor tiles, you need to use coarse sand.

Therefore, Jiang Laogan and the others mixed the ratio of cement and sand together at a ratio of 1:3 according to Huangshi's requirements, stirred while adding water, and stirred to the extent required by the chief, before going to the bathhouse to call Huangshi out for acceptance.

"That's it." Huang Shi put back the handful of cement mortar in his hand, walked to a large water tank soaked in tiles, put his hand in and washed it, and then pulled out a piece from it, after the tile was soaked in water, the color would become darker, and the contrast between the old and new tiles would have obvious color differences. After putting the tiles back into the water tank, look carefully and see that the tiles in the water tank are no longer bubbling.

Ceramic tiles are made of clay fired at high temperatures, and there are many tiny voids inside that cannot be seen by the naked eye, and they are very dry, so they have a certain amount of water absorption. If you do not soak in water or soak in water is not enough to pave directly, the tile will quickly absorb the moisture of the cement slurry that is paved, and the moisture in the general cement is insufficient, so the moisture absorbed by the tile will be uneven, so that the tile absorbs the water will make the cement shrink quickly too fast, and the uneven shrinkage causes the tile and the cement slurry to appear in the void, and the bond is not firm, resulting in "hollowing" and tile falling off.

"Hollow drum" is commonly known as "two layers of skin", is caused by the presence of air in the tile and the plaster layer, if you use a hard thing, such as a key or tap the surface of the tile with your fingers, you can hear the "hollow drum" where there will be a "knock knock" sound, this paste, the combination is not solid, the tile will soon fall off from the wall.

Therefore, no matter what kind of ceramic tiles, the tiles must be soaked in water before paving, so that their pores can fully absorb sufficient water, and then smeared with the cement mortar that is well prepared, and the water in the tiles will not be absorbed, so that the quality of the paving can reach a certain standard, and it is not easy to appear after the tile is hollow, falling off, cracked, deformed or uneven.

"Yes, it should be fine." Huang Shi took the tile and checked it, feeling that its weight was a lot heavier, and when he saw that the time on the watch was up, he ordered Jiang Laogan's subordinates to take out these tiles and move them into the bathhouse to dry.

Huang Shi then emphasized to Jiang Laogan the time and scale of soaking water, because these are only the first batch, and the rest depends on Jiang Laogan and them to strictly grasp it, especially the "ceramic brick" they want to paste this time, which is a kind of ceramic tile with a special water absorption rate, with a water absorption rate of up to 10%, which must let them drink enough water.

"Ceramic brick" is a kind of ceramic tile, but according to the water absorption, it can be roughly divided into "porcelain brick" and "ceramic brick". Among them, the water absorption rate of "porcelain bricks" is 0. 5% or less, therefore, only need to be slightly watered before paving; The water absorption rate of ceramic bricks is less than 20%, and it must be soaked in enough water before paving. And it also depends on the weather conditions, in the rainy season because of the humid air, the time should be shortened accordingly; And when the weather is dry in the hot summer, the time will increase accordingly.

As a tile, the lower the water absorption rate of the product, the better, the inferior ceramic tile has a high water absorption, the surface of the tile is cracked due to expansion, and the dirt in the water is easy to be inhaled, and it is easy to produce peculiar smell after long-term use. But Huangshi bought a batch of "ceramic bricks", of course, that's because, firstly, considering the price ratio, each piece of "porcelain bricks" is several times or even more than ten times that of "ceramic bricks"; Secondly, because this "public bathhouse" is also a temporary building, and it is uncertain when it will be torn down and restarted.

……

Huang Shi saw that everyone was busy doing things over there, and he didn't mean to help, because he was now an "immortal", and he didn't need to do it himself, so he tried not to do it himself, and he maintained a certain majesty in the workplace, which was also a manifestation of the art of leadership, after all, he was not in modern society now.

"Stop!" Suddenly, Huang Shi screamed, and almost didn't smash the tiles on his feet with a shudder of his hands for a few people who were moving bricks.

"Lao Gan, when you put the tiles in the future, you must have the glaze side up, the pottery side down, if the glaze side is down, the tile corners will bump each other, easy to fall off the porcelain." Huang Shi walked up to a man who had put tiles in the tank, and he had just caught a glimpse of the person who had put them in reverse order before calling a halt.

"Good, chief." Jiang Laogan wrote down another rule in his heart.

Huang Shi pointed to some paper skins on the ground, which were the tile packaging boxes that had just been opened, and said to Jiang Laogan, "Also, you just moved the tiles in and forgot one thing." ”

Jiang Laogan thought to himself, "What's the matter, it seems that we all did what you ordered!" ”

Huang Shi didn't care what Jiang Laogan was thinking, "The ground inside should be padded with a packaging carton, and the tiles should also be placed with their backs against the wall, with the glazed side facing up." If you put it backwards, then the sharp corners of the glaze hit the ground, because the corners of the tiles are very brittle, so it is easy to knock off the porcelain. ”

"Yes, Chief." Jiang Laogan touched his head, a little puzzled, as if he remembered that the chief didn't say it just now.

Huang Shi walked around the scene again, thinking about whether he had missed any details, which made the people around him feel uneasy in their hearts.