Why do workers add sugar to cement? Does this do any good?

Because the cement hardens quickly in hot weather, in order to slow down the hardening rate of the cement, workers usually use cost-effective white sugar as a buffer. When the hometown was building a house, I don't know if my friends found such a strange phenomenon, that is, many workers will add sugar to the cement, why do the workers add sugar to the cement?

The main components of cement are limestone, clay, gypsum and sand, which undergo chemical reactions in river water.

The cement powder eventually produces hydrated calcium silicate.

If white sugar is added to it, the main component of cement, tricalcium silicate particles, will be adsorbed. The hydrated calcium silicate essence on the surface of the particles will also be eliminated, and the cement will not become cement. Therefore, white sugar has become a magic material used to control the setting time of cement, but not all sugar can alleviate the setting time of cement.

Some sugars can be used as thickeners.

For example, methyl glucose.

dry, it is polyester polyol in polyrice.

of the synthesis pass.

It is often used as a tool agent and a twig mediator. There are many commercial retarders on the market now, but most of them are very expensive, or is it more clear to belong to white sugar?

In hot weather with higher temperatures. The cement will harden quickly, in order to slow down the hardening rate of the cement, workers usually use more suitable white sugar for buffering. It is guaranteed that under normal construction, the cement will not harden quickly, and sometimes you will see workers spraying liquid on the surface of the cement, yes, spraying sugar water.

This is to create a matte finish with rough variations, and at the same time, you'll also see white sugar in the cement mixer's car. This is because accidents such as traffic jams often occur, and sugar is used to prevent the cement from solidifying. So what else would be the connection between sugar and cement?

The first sugar can enhance the impermeability and fluidity of concrete, because the viscosity of concrete is too large, and it is difficult to fall into the magic when the mold is poured.

Secondly, the density of concrete is large, the fluidity is relatively poor, and it is difficult to press the angle of view in construction, so the construction quality of concrete will be greatly affected. It has a great impact on some construction operations with higher requirements, such as water tanks with seismic requirements, granaries and cement warehouses with air tightness requirements.

Although it can be solved by increasing the amount of water and increasing the shedding of the coagulation version, this will be unavoidable. It has a great adverse effect on the strength and permeability of concrete, and this is where sugar plays an extremely important role, and sugar can solve this problem.

<>When using this method, we must control the amount of sugar, not too much and not too little. Too many words, this makes the concrete lose its own compressive effect, so there is a saying that white sugar is also the nemesis of cement. Let me give you another example, World War II.

Everyone should know that French soldiers used white sugar to add to cement.

Here, I would also like to remind all construction site personnel and teammates that they must pay attention when drinking milk tea or white sugar water on the construction site. Don't let cement taste this delicacy, if you are not careful, it will cause some damage.

Because in this way, the cement can achieve anti-freezing effect, which can prevent the cement from solidifying, and will not affect the normal use in the future. It is possible to reduce the fluidity of cement. A rough matte finish can be obtained.

Alleviate the time for cement to set. Yes, delaying the time for cement to solidify, allowing the cement to solidify for a longer period of time, can also make the cement more viscous.

Slowing down the solidification rate can avoid many problems, complete the task better, delay the time, and improve the quality.

This is because I want to make the cement softer in this way, so that it is easier to work with the cement without too much effort.

In general, sugar is an organic substance, organicSurfactantsIt can be adsorbed on the surface of cement minerals, prevent the hydration of cement minerals, and slow down the hydration rate of cement. As long as its content is strictly controlled, it can play the role of a retarder. Retarder should be added in moderation, too much will reduce the strength of the concrete.

Because the cement hardens quickly in hot weather, in order to slow down the hardening rate of the cement, workers usually use cost-effective white sugar as a buffer.

When I was building a house in my hometown, I don't know if my friends noticed such a strange phenomenon, that is, many workers would add sugar to the cement. Why do workers add sugar to cement? Generally speaking, sugar is an organic substance, and organic surfactants can be adsorbed on the surface of cement minerals, so that the surface of cement particles forms a thin film and blocks water molecules.

It diffuses to the inside of the unhydrated cement particles, delays the cement clinker particles, and thus achieves the purpose of retarding. The main components of cement are limestone, clay, gypsum, and sand, which undergo chemical reactions in river water.

Cement powder eventually produces calcium silicate hydrate.

If sugar is added, the main component of the cement, tricalcium silicate particles, will be adsorbed. Hydrated calcium silicate on the surface of the particles will also be eliminated and the cement will not turn into cement. So sugar has become a magic material to control the setting time of cement, but not all sugar can alleviate the setting time of cement.

When cement is mixed with the right amount of water, it forms a kind of sand that binds sand.

The plastic slurry is then gradually hardened by coagulation and hardening to become a solid stone-like body.

Some sugars can be used as thickeners.

For example, dried methyl glucose.

It is commonly used as a tool and branching regulator for the synthesis of polyester polyols. There are many commercial retarders on the market now, but most of them are very expensive, or is it clear that the ** of white sugar is clear? The seawater through which the bridge passes has a high chloride ion content and is highly corrosive, making it impossible to use ordinary concrete.

In order to solve this problem, the construction unit invited Peking University and Tsinghua University.

The experts have developed high-durability offshore concrete to successfully lay bridges across the sea. In hot weather. Cement hardens quickly, and in order to slow down the hardening of cement, workers usually use more suitable white sugar as a buffer.

It is true, because white sugar can adsorb calcium silicate particles, the main component of cement, and can prevent cement from hardening, workers generally do not choose more expensive retarders and use white sugar instead of retarders.

This is true, adding white sugar to cement can play a harmonizing role, can adsorb calcium silicate particles in cement, can prolong the time of hardening.

It's true that adding sugar to cement can be used as a retarder, and cement can slow down the coagulation.

Useful. The main components of cement are calcium oxide, silica, iron oxide, and alumina, and the addition of sugar can delay the solidification of cement. Calcium, tricalcium aluminate, tetracalcium aluminate.

The tricalcium silicate in the cement will turn into hydrated calcium silicate when exposed to water, which can quickly coagulate. If sugar is added to the cement, it can prevent the formation of hydrated calcium silicate, that is, it can hinder the formation of cement. Congeal.

And in this process, the amount of white sugar used is also very small. We only need to add white sugar to the cement to double the setting time of the cement, which originally only took 18 hours. Solidification occurs.

Of course you can. The sugar reacts with the calcium silicate in the cement, which then prevents the formation of hydration products.

The purpose of adding sugar to cement is to delay the solidification of cement, which is very useful, because cement is a silicate mineral, and sugar is granular, and after being added to cement to dissolve, the molecules will be adsorbed on the surface of hydrated calcium silicate. It will prevent the formation of hydration products, so it will delay the setting of cement.

Concrete with white sugar can play a role in retarding.

The requirement of early strength in winter is to increase the strength as soon as possible to prevent frost damage. Summer retarding is to reduce the heat of hydration and prevent cracks. White sugar is used as a retarding material, although the retarding effect is good and can save costs.

However, it will produce false coagulation for some cement, and white sugar is more sensitive to temperature, so it is not suitable for places with large temperature difference between morning and evening. And generally the maximum dosage should not exceed 15 kg.

Slow-setting concrete: Because Portland cement has a fast setting rate, it can be finally set in half an hour. In the construction, due to technological reasons, especially pumping concrete, retarding technology is required, and retarding agent must be added at this time, otherwise the pipe will be blocked.

Generally speaking, when the retarding time is less than 48 hours, the later strength of the concrete will not be affected, and it may increase. After more than 48 hours, the strength of hardened concrete will be reduced by more than 20-30%.

The effect of coagulation and hardening.

The reason why cement will harden is mainly because the main components in the cement, such as tricalcium silicate and dicalcium silicate, will react with water to generate hydrated calcium silicate and calcium hydroxide.

The mainstream view is that after the sucrose is dissolved, the sucrose molecules will be adsorbed on the surface of the hydrated calcium silicate, thereby preventing the further growth of the hydration products, and the calcium sucrose produced will also be adsorbed to the surface of the sailor mud particles, resulting in the increase of the repulsion between the particles, making it difficult to agglomerate, thereby delaying the hydration of cement, improving the plasticity of concrete, and prolonging the setting time.

The effect of white sugar on cement

The sprinkled sugar will adsorb on the particles that have not yet had time to hydrate the tricalcium silicate, and destroy the calcium silicate crystals formed on the surface of the particles, thus preventing the formation of crystals. Experiments have shown that cement, which originally takes one hour and 18 minutes to solidify, can be doubled if the added sugar is added.

In addition, the resulting calcium sucrose will be adsorbed to the surface of the cement particles, and it is difficult to expand and intertwine between the particles, so the cement solidification time is delayed and the impermeability and fluidity of the concrete are enhanced. In the process of slowing down the concrete in the process of lightening, the temperature difference between the inside and outside is unevenly controlled, which is easy to produce cracks, and white sugar can reduce the temperature released by the cement and reduce the cracks on the surface.