Why do many rural houses have saltpeter on the walls? How did it come about?

If you live in the countryside when you are young, you will definitely see that some houses in the countryside are red brick houses, and if these red brick houses have been used for a long time, a layer of white dust will appear on the outside, and this thing is called saltpeter.

There are many reasons why saltpeter appears on these rural houses, which is related to the raw materials used in the production of red bricks, the construction process, and the local climatic conditions. <>

Most rural houses are made of red bricks, and there will be a layer of hoarfrost on the outside, which is because some material is added to the red bricks during the production process, and this material is called "coal gangue", which has carbon dioxide in it.

There is also alumina.

Iron oxide and calcium oxide.

and so on. Therefore, if too much gangue is added in the process of firing red bricks, the newly made red bricks will appear hoarfrost after a long time in the process of use, and this phenomenon of hoarfrost also has a very professional name called alkalization. <>

Many people in rural areas use red bricks when building their own houses, and these red bricks need to absorb a lot of water when they are used to be able to have a connection with cement, and then these bricks are built into a wall, which will become particularly strong, so the water in it cannot evaporate for a while. Although it looks like the walls on the outside have dried, the inside is still damp, and the bricks are often watered during the process. Therefore, in the process of later decoration, the moisture in the wall may not be completely volatilized, and then this white crystal will appear on the wall, which is also an anti-alkali phenomenon.

If you look closely, you will find that the more humid the place, the more serious the occurrence of saltpeter. Most of the places where such white bricks appear in the countryside are damp places that have fallen into disrepair, and some places have even grown moss. If a brick is sold in vain, it means that the life of the brick is not long, so this kind of brick will only be seen in some old houses, and the brick body has basically been seriously corroded, and the house is crumbling.

This is the crystallization of nitrate and nitrite, that is, the chemical reaction of the two compounds. This is due to the collision of nitrate and nitrite in the process of building the house, and there is a chemical reaction that will lead to the production of such saltpeter.

It may be due to the fact that after the construction of the house, the walls of the house will cause a chemical reaction in the air, so such saltpeter will be produced. This is due to the chemical reaction that the air has with the stone.

Because the building materials on the walls of many houses in rural areas generally have nitrates, and after a long period of wind and sun, nitrates will return to alkali, so he will appear a layer of white frost on our toilets or on the ground and walls.

This is formed by the interaction of microorganisms nitrosifying bacteria and nitrifying bacteria. Others are formed by the decay of organic matter.

It is mainly related to the raw materials of red bricks; related to the construction process; Associated with dampness; The more damp the place, the more serious the white nitrate, so we can often see some white nitrate bricks in the countryside, most of which are relatively wet, and some have even grown moss.

This is due to the environment, because the surrounding environment has some major components of nitrate, so this situation occurs, and it is also related to the decomposition of microorganisms.

Introduction: In daily life, we can find saltpeter on many rural houses.

So how did this kind of thing come about, let's find out together.

1. How saltpeter on rural houses is produced

We can see that there will be a white thing on the wall of many rural houses, in fact, this kind of thing is called Xiaoshi. And it looks very shabby, and it's like white frost, but many people will use tiles to scrape and play, so many people know about this kind of thing. He has a name called fire consumption, so many people will also call it Yan Xiao or fake consumption, which belongs to a kind of nitrate.

It is also a product of chemistry. It has some uses, and you will find that when you are old or have a sense of history, there will be such a thing, because through the accumulation of some wind and rain, wind and sun, it will grow such some substances.

Second, it has many uses

It has some uses, it can be used to prepare peacock green oil, it can also help people make some colorful pastel pigments, and another use is that it can be used as pyrotechnics, we also need to use this substance in the process of making matches, especially some glass or food preservatives.

Or black powder, which requires this substance. Generally, there may be hoarfrost on the red bricks, because this is also related to the raw materials, we will add some materials when making red bricks, this time is called when it is not dry, because it will have carbon dioxide in it when it is not closed.

There is also some iron oxide.

When the composition of calcium oxide is exposed to wind and rain for a long time, the wind and the sun will cause frost. People also call this phenomenon alkalization, so that's what it gets its scientific name. So it's not surprising that we see something like this, it's just through some chemical changes.

Some of the substances produced are also very versatile, so it is also very necessary for us to pay attention to science, which can allow us to know more things and understand more truths at this time.

Because the raw material of red bricks contains calcium oxide, but also contains iron oxide. These ingredients can easily cause hoarfrost, and they are also easily alkalized, which will produce saltpeter.

Because many houses are made of earth, there is some alkali in the soil, and these things will be slowly sucked out, so there will be some saltpeter.

Because most of the houses in the countryside are soiled, saltpeter will be produced after a long time of wind and sun.

During the firing process of red bricks, a substance called coal gangue should be added, which contains carbon dioxide, alumina, iron oxide, calcium oxide and other components. If too much of this gangue material is added, the bricks are prone to frost. In rural self-built houses, most people use red bricks.

Bricks need to absorb a lot of water to increase the viscosity between the bricks and cement. But when the bricks are embedded inside the wall, the evaporation process of the moisture inside the wall is very slow.

Sometimes the bricks on the outside are dry, but the inside is wet. At the same time, in the process of painting interior and exterior walls, since the bricks absorb the moisture in the cement mortar, they should be watered from time to time to prevent cracks on the surface of the painting. If the construction crew starts the renovation before the wall is completely dry, the water in the wall will react with the air during the volatilization process, thus forming white crystals on the wall, which is alkali resistant.

The higher the humidity, the more severe the white nitrate. As a result, we often see some bricks containing white nitrates in rural areas. Most of them are relatively moist, and some even grow moss.

Humidity exacerbates the phenomenon of white nitrate, which explains why it is easy to produce white nitrate in some relatively humid places, such as toilets, corners, and sewers. In many old houses in rural areas, white nitrates have been played with on bricks. Most of the bricks containing white nitrate have been eroded and broken, but the bricks that do not contain white nitrate are intact.

That is, when the brick is exposed to white nitrate, it is almost already corroded, and the brick does not last long.

If the self-built house is uninhabited for a long time, it should be waterproof and moisture-proof to avoid white nitrate due to excessive humidity of the house. At the same time, when building a house, it is necessary to take measures to protect it from moisture. It is best to use the overhead method to create a certain gap between the surface and the foundation.

At the same time, a certain number of exhaust holes can be left around the ground ring beam. In this way, it is easy to create a convection effect in the indoor air, ventilate, reduce humidity, and avoid white nitrates. When I was a child, the white material outside the façade of an old country house was originally called white nitrate, and the appearance of white nitrate was related to the brick material and humidity.

If you don't want it to appear, you still need to take some precautions.

This is because the house is built with red bricks, which is related to the construction environment and the construction process.

Because the house built in this way is stronger, and it will also have a certain moisture insulation effect, and at the same time, it can also make the house look more solid, and there will be no worries about any safety issues.

The alkaline content of the soil on the walls is caused by the fact that the mud houses in the countryside are made of mud.

Very old dirt walls will be thereSaltpeter

The saltpeter on the walls of the village earthen houses is actually caused by the overflow of alkali contained in the soil walls. Rural mud houses use mud for the walls, and are generally old houses of considerable age. The pan-alkali situation in the old house has disappeared, and there will be no more pan-alkali phenomenon.

The phenomenon of panalkali (saltpeter) is mainly the new earthen walls of new houses.

How did the saltpeter on the wall appear? What does it have to do with it?

People who have lived in the countryside know that most houses in the countryside will have this white saltpeter on the red bricks, so what is the relationship between the appearance of this white saltpeter? And how did it come about?

1. The saltpeter on the red brick is mainly related to the raw material of the red brick, and in the process of firing the red brick, a material should be added, which is called "coal gangue", and the coal gangue contains carbon dioxide.

Alumina, iron oxide.

Calcium oxide and other ingredients. If too much of this gangue material is added to it. In this way, the bricks produced will easily produce "hoarfrost", and the technical term for hoarfrost is "alkalizing".

2. Related to the construction processIn the self-built houses in rural areas, most people use red bricks. The bricks need to absorb a lot of water during the use process to increase the viscosity between the bricks and the cement. But when the bricks are built into a wall, the evaporation process of the water inside is very slow.

Sometimes it can be seen with the naked eye that the bricks on the outside are dry, but the inside is very damp. At the same time, in the process of brushing the interior and exterior walls, the bricks should be watered from time to time to prevent the bricks from being dried up by the cement mortar.

The moisture inside causes the stucco surface to crack.

If the construction crew does not wait for the wall to dry completely before starting the decoration, then the moisture in the wall will have some kind of chemical reaction with the air during the volatilization process.

It will cause white crystals to appear on the wall, which is the anti-alkali phenomenon.

The nitrate on the wall is mainly because the sand in the concrete contains more salt and alkali, when in a humid environment, the salt alkali and the cement have a chemical reaction, thus forming a white substance on the wall, and the nitrate is formed after seeping out in the later stage. Nitrate is salt alkali, when the wall is denitrified in a large area, if it is not treated, it will lead to the future coating of the alkali wall to shell and fall off.

The treatment method is recommended to take: 1. Brush the alkali wall several times with a stiff brush (it must be dry brushed, washed or neutralized with acid is impossible to remove completely), and then clean. Second, the first putty bottom adopts the construction process of exterior wall waterproof coating, that is, the construction white cement putty powder is mixed with JS waterproofing agent and then the base is laid.

The subsequent procedures can be carried out according to the normal coating application process.

Saline-alkali land is a kind of salt accumulation, which means that the salt contained in the soil affects the normal growth of crops. Generally, it is formed under the influence of natural conditions and human activities such as arid climate and little rainfall, high evaporation, low terrain, high groundwater level, and high salinity.

In the transformation of alkaline land, the construction of canals, the drilling of deep wells, the dredging of alkali ditches and other engineering measures are a blind one-time investment, which requires more manpower, material resources, financial resources and technology, because the economic level of rural households is still low at this stage, the investment capacity is limited, the willingness to invest is not high, mainly relying on state investment, making it difficult to expand the scale of transformation.

Many people may find that there will be a layer of white hair on the wall of the house, which is nitrate, especially in some old houses, including self-built houses, this phenomenon is more common. So what causes nitrate on the wall? And what are the solutions?

1. What does nitrate mean on the wall?

The so-called wall nitrate, in fact, is the meaning of alkali, in some hometown walls are more likely to appear, will affect the aesthetics of the wall, and this wall will slowly corrode, resulting in loose bricks. There will be a layer of white saline-alkali layer on its surface, or a layer of white hair, mainly because the sand in the cement contains a large amount of saline-alkali substance, after encountering water, it dissolves and reacts with the cement, it will become an alkaline substance, and after the moisture is slowly lost, it will form a white hair phenomenon on the wall.

2. How is the nitrate on the wall formed?

Nitrate is saline-alkali, the main reason for the nitrate on the wall is that the sand in the concrete contains more saline-alkali, when in a humid environment, the saline-alkali and cement have a chemical reaction, thus forming a white substance on the wall, and the nitrate is formed after seeping out in the later stage, and the wall will gradually be corroded, affecting the aesthetics.

3. How to solve the problem of nitrate on the wall.

1. The nitrate of the wall is relatively simple to deal with, we can use oxalic acid or acetic acid to soak water to wash the wall, as long as the surface of the nitrate is rinsed clean, then rinsed with water, repeated many times can make the surface of the nitrate remove.

2. If the area of nitrate is relatively large, the surface should be completely removed, and then cleaned with oxalic acid, and then wait until the wall is dry, you need to scrape the putty again, it is best to choose a slightly better quality putty, and then wait until it is dry and then reapply the latex paint.

Summary: The nitrate on the wall is actually a product formed after the reaction between the oxide on the brick wall and water, which is generally a white hair phenomenon, but we can wash it away with oxalic acid.