Why does concrete turn white when it solidifies

When it solidifies, the calcium in the water solidifies on the surface and turns white. Satisfied.

Is it better for the concrete to dry and turn blue or white: Hello dear I am glad to answer for you <> is blue. 1. There are two reasons for the whitening of the concrete floor: first, the salt substances in the concrete evaporate to the surface with the water in the concrete and crystallize to form white crystals; Second, when the concrete ground is cured, the curing agent is used too much, the concrete ground has reached saturation with the curing agent, and the remaining curing agent material remains on the surface of the concrete, evaporating to form white crystals.

Pin wheel noisy. Second, the hazards of concrete ground whitening Concrete whitening will not only affect the appearance of the ground, but also form a transparent capillary between the top and bottom of the concrete, which will have some impact on impermeability, durability and service life. It is very likely that the concrete floor will be dusted and sanded in a very short period of time, which will affect the normal use of the ground.

After the concrete is poured, what is the cause of the whitish surface?

Kiss, <>

We're glad to answer your questions! After the concrete is poured, the surface is whitish, which is a very normal situation. Colloquial name"Alkali"Nothing ***.

You don't have to worry about the fact that the whitish concrete is a sanding phenomenon: the surface of the concrete is rough, the finish is poor, the general color is whitish, and it is not solid. Once walked or rolled by the vehicle, the surface is dusted first, and with the increase of the number of walking or rolling, the sand particles gradually loosen or fall off in pieces.

Causes of sanding: The occurrence of sanding on the surface of concrete is caused by a variety of reasons. In general, the main reasons are as follows:

1. The reason for people is the first factor, and people's ideological concepts, theories and technical levels directly affect the quality of the project. Therefore, enterprises should continue to improve the quality management system, appoint people who will implement to improve execution, and strengthen the training and management of personnel, which is the fundamental to prevent the occurrence of common problems and quality accidents of engineering quality. 2. Construction (1) With the application of modern construction machinery and ready-mixed concrete, most construction personnel are lazy than in the past, and their sense of responsibility and quality awareness is not strong.

In the construction of many projects, no matter what part is poured, it is hoped that the concrete mixture is the best self-leveling, and blindly pursues the construction progress (the faster the better), and rarely cares about the quality and cost (the phenomenon of adding water on site is widespread), buries hidden dangers to the quality of the project, and causes a huge waste of cost and resources. It can be said that these bad behaviors have become a stumbling block to the progress of concrete technology and engineering quality in China, and have seriously affected the durability and service life of concrete structures. (2) The basic work of many units is not solid, and the "quality first" is not really implemented, and the quality management work is not in place, which is often a formality.

3) The technical management personnel of some construction units do not make technical disclosures before construction, and the training and guidance of relevant personnel are less, and the supervision and control of the process process is insufficient. (4) The quality problems of many projects are related to the low technical quality of the construction personnel, the lack of experience, or the weak sense of responsibility and quality, especially the project of the application of ready-mixed concrete, which thinks that there is a problem with the "back" of the mixing plant, so the sense of responsibility is reduced. 3. Production (1) At present, China is in the peak period of large-scale capital construction, the application and development of ready-mixed concrete is growing rapidly, and many small cities have established ready-mixed concrete batching plants, resulting in a shortage of management and technical personnel in the ready-mixed concrete production industry.

2) The concrete mixed on site, because it is rarely equipped with testing equipment and professional and technical personnel, the quality of concrete composition materials and mixtures is often out of control, and the quality is far less than that of ready-mixed concrete, and the existing problems are more and more serious. (3) The mixing time is short, the concrete is uneven, and the homogeneity does not meet the requirements. Hope mine can help you!

Answer: After the concrete is poured, the surface is whitish for the following reasons:

1. The amount of fly ash in the concrete mix ratio is less, and the amount of ore powder is more, so the amount can be adjusted.

2. The concrete construction and maintenance are not in place, resulting in too much moisture in the concrete and the phenomenon of whitening.

3. The water-cement ratio is too large. The larger the water-cement ratio, the more free water in the mixture, the greater the possibility of water leakage from the concrete, and the more whitening the concrete.

4. The quality of the hardener in the construction is not up to standard.

5. The alkalinity is too strong, and the draft is whitened in concrete.

Concrete] 1, concrete, referred to as "concrete (tóng)": refers to the general term of engineering composite materials that cement aggregates into a whole by cementitious materials. The word concrete usually refers to the use of cement as cementitious material, sand and stone as aggregate; With water (can contain admixtures and admixtures) in a certain proportion, the cement concrete obtained by mixing, also known as ordinary concrete, it should be widely sold for civil engineering.

2. According to the apparent density, concrete can be divided into: heavy concrete, ordinary concrete, and light concrete. The difference between these three types of concrete is the difference in aggregate.

3. Inorganic cementitious materials such as cement, lime, gypsum and other inorganic cementitious materials are mixed with water to make the concrete mixture plastic; In turn, the strength is produced by condensation and hardening through chemical and physicochemical actions. Generally speaking, drinking water can meet the requirements of water for concrete mixing. Excess acids, alkalis, salts, and organic matter in water can all have harmful effects on concrete.

Aggregate not only has a filling effect, but also has an important impact on the bulk density, strength and deformation properties of concrete.

4. In order to improve some properties of concrete, admixtures can be added. Due to the obvious technical and economic effects of admixtures, it has increasingly become an indispensable component of concrete. In order to improve the workability of the concrete mixture or the performance of the hardened concrete, save the cement, the finely ground mineral material admixture can also be incorporated when the concrete is mixed.

It is divided into two categories: active and inactive. The nature and quantity of admixture affect the strength, deformation, heat of hydration, impermeability and color of concrete.

5. When preparing concrete, first of all, according to the requirements of the project for workability, strength, durability, etc., the raw materials should be reasonably selected and their matching ratio should be determined, so as to achieve the purpose of economic application. The design of the concrete mix is usually carried out according to the requirements of the water-cement ratio law. The calculation of material dosage is mainly based on the assumption bulk density method or the absolute volume method.

Summary. Dear, I'm honored to have your question The information that the teacher found for you here is: After the concrete is poured, what is the reason for the whitish surface?

After the concrete is poured, what is the reason for the whitening of the surface: in fact, the whitening of the concrete surface after pouring is the biggest reason for the late curing or insufficient curing, and the surface color of the normal curing concrete is light gray instead of white. The cast-in-place of the floor, especially in the high temperature season like this, should pay special attention to the timely maintenance of concrete, and the improper maintenance of the floor is prone to quality problems.

After the concrete is poured, what is the cause of the whitish surface?

Dear, it's an honor to be able to keep an eye on your question The information that the teacher found for you here is: After the concrete is poured, what is the reason for the white surface in Sunzhou? After the concrete is poured, what is the cause of the whitish surface?

In fact, the whitening of the concrete surface after pouring is the biggest reason for the late curing or insufficient curing, and the surface color of the normally cured concrete is light gray instead of white. The cast-in-place of the floor, especially in the high temperature season like this, should pay special attention to the timely maintenance of concrete, and the improper maintenance of the floor is prone to quality problems.

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